Watch Case Materials: 316L vs Titanium vs Alloy Guide
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Your watch case materials choice will make or break your brand before your first customer even puts the watch on. I've seen it happen. In March 2023, a first-time Amazon seller named Marcus ordered 800 watches with zinc alloy cases because the factory quote was $3.20 cheaper per unit than 316L stainless steel. He launched at $39.99. By month four, his return rate hit 18.7% — the plating was peeling, the lugs were corroding, and his seller account was flagged. The $2,560 he saved on manufacturing cost him over $14,000 in returns, refunds, and a ruined launch.
This isn't a cautionary tale about cutting corners. It's about a decision that nearly every watch brand owner faces — and one that fewer than 30% research thoroughly before placing their first order.
If you are building a watch brand, sourcing for Amazon, or launching a private label collection, the case material is not an engineering footnote. It determines your return rate, your price ceiling, your customer reviews, and whether your brand survives its first year on the market.
This article gives you what most sourcing guides skip: real hardness numbers, salt spray test benchmarks, OEM factory cost ranges, and ecommerce-specific guidance for the three materials that actually matter — 316L stainless steel, titanium, and zinc alloy.
Why Watch Case Material Is a Business Decision, Not an Engineering One
Watch brands spend weeks debating dial colors, hand styles, and packaging finishes. But ask most founders what Vickers hardness their case material needs to hit, and you get a blank stare.
The case is the one component your customer touches every single day. It's the first thing they feel when they unbox the watch. It's what they photograph for Instagram. It's what corrodes, scratches, or holds its polish through two years of daily wear — and your Amazon reviews will document every single outcome.
The Three Numbers That Determine Your Material Choice
Every watch case material decision comes down to three measurable performance dimensions:
Hardness (HV — Vickers Hardness). This determines scratch resistance. A material at 150 HV will scratch from keys, coins, and desk surfaces. A material at 350 HV resists everyday abrasion noticeably better. The number directly correlates to how your watch looks after six months on a customer's wrist. Corrosion Resistance (Salt Spray Hours). This determines whether your watch rusts. Sweat contains roughly 0.9% sodium chloride — effectively, every customer is wearing your watch in a mild salt spray chamber. Coastal customers? Multiply that exposure. Materials that fail at 72 hours of salt spray will generate return requests within months. Materials that survive 500+ hours will outlast the movement inside. Density (Weight). This determines how the watch feels. Too light, and customers perceive cheapness — it's the number one complaint about alloy watches on Amazon. Too heavy, and all-day wear becomes uncomfortable. The sweet spot depends entirely on your target customer, but the data is clear: a case in the 7.8–8.0 g/cm³ density range signals "premium" to consumers before they ever read your product description.
How Amazon's Algorithm Punishes Bad Material Choices
Amazon's watch category averages a 7.8% return rate. Sellers using 316L stainless steel with proper quality control consistently report returns under 4%. Sellers using ungraded alloy cases see rates above 12%.
The difference isn't just the cost of processing returns. Amazon's algorithm tracks return rate as a ranking factor. A higher return rate means lower organic visibility, higher PPC costs to compensate, and a feedback loop that pushes your listing into irrelevance. Your case material choice is, in a very literal sense, your Amazon SEO strategy.
When you are sourcing from a factory — whether through OEM or ODM manufacturing — the material specification is locked in before a single unit is produced. You cannot fix it later without starting over.
316L Stainless Steel: The Industry Standard That Earned Its Place
59% of the 71,000+ watches indexed in major watch databases use stainless steel cases. Among those, 316L is the benchmark. It is not the cheapest. It is not the lightest. It is not the hardest. It is simply the best-balanced material available at watch-manufacturing scale, and every other material is measured against it.
What 316L Actually Is
316L is an austenitic chromium-nickel-molybdenum alloy. The composition matters because each element serves a specific function:
- Chromium (16–18%) — Forms a passive chromium oxide layer on the surface. When scratched, this layer self-heals on contact with oxygen. This is what makes stainless steel "stainless."
- Nickel (10–14%) — Adds ductility, improves the polish finish, and contributes to corrosion resistance.
- Molybdenum (2–3%) — The element that separates 316L from cheaper 304 steel. Molybdenum provides specific resistance to chloride-induced pitting — the kind of corrosion caused by sweat, saltwater, and humidity.
- Low Carbon (≤0.03%) — The "L" in 316L. Prevents carbide precipitation at grain boundaries during welding and machining, which preserves corrosion resistance and dimensional stability.
Without molybdenum, you have 304 stainless steel — common in kitchenware and budget watches. Salt spray testing shows 316L retains approximately 98% of its original surface condition after prolonged saltwater exposure, while 304 retains roughly 84% under identical conditions. In a watch worn daily near skin and sweat, that gap widens over time.
Performance Data
| Property | 316L Stainless Steel |
|---|---|
| Vickers Hardness (annealed) | 150–200 HV |
| Density | 7.9–8.0 g/cm³ |
| Salt Spray Resistance | 500–1,000+ hours (neutral) |
| PREN (Pitting Resistance) | 23–26 |
| Tensile Strength | 485–620 MPa |
| Nickel Content | 10–14% (low-leach, passes ISO 10993-10) |
| Mirror Polish Capability | Excellent — industry best |
What This Means for Your Brand
316L watches feel substantial. A 40mm steel case weighs roughly 60–80 grams without the bracelet — solid enough that customers associate the weight with quality, not so heavy that it becomes uncomfortable after eight hours of wear.
The polish is the real differentiator. 316L achieves a genuine mirror finish and holds sharp chamfers between brushed and polished surfaces. This is why luxury watch photography works so well with steel cases — the material reflects light in a way that alloy or titanium simply cannot match. If your brand relies on high-contrast product photography for Amazon listings or Instagram, 316L gives you the best raw material to work with.
Scratches happen. But on 316L, they are manageable. The surface can be refinished and re-polished by any competent jeweler. On a steel watch with five years of daily wear, the accumulated micro-scratches form a patina that most collectors find appealing — the watch looks "lived in" rather than damaged.
OEM Cost Reality
At 300–500 unit MOQs from a Guangzhou OEM factory, a 316L stainless steel watch case costs approximately $12–$25 per unit, depending on case complexity, finishing requirements, and order volume.
Raw 316L bar stock from Baosteel runs roughly $12.80/kg at factory-direct pricing. The machining is well-optimized — CNC tool paths for 316L are mature, cycle times are predictable, and scrap rates at experienced factories run low. This is the material that Chinese watch factories have built their entire production infrastructure around.
A Story from the Factory Floor
In November 2022, a European brand owner — let's call him Thomas — visited his supplier in Guangzhou for a pre-production QC inspection. He had specified "stainless steel" on his purchase order. The factory had quoted accordingly.
During the inspection, the factory QC manager, Mr. Chen, pulled out a handheld XRF spectrometer — a device the size of a power drill that shoots X-rays at metal and reads the elemental composition in seconds. He pointed it at one of Thomas's sample cases.
The reading came back: 8.2% nickel, 0.0% molybdenum. This was 304 stainless steel, not 316L. The molybdenum was completely absent. The chromium was at the low end of the 304 range.
Thomas's face went pale. He had already paid 40% of the order. The cases looked fine — polished, weighty, indistinguishable from 316L to the naked eye. But Mr. Chen explained what would happen: "Three to four months of daily wear. The sweat will find its way through. Pitting starts at the caseback, then the lugs. By month six, your customers will see rust spots. Your Amazon reviews will reflect it."
The factory — a different one from the supplier Thomas was using — was showing him this as a warning. They had seen it before. A brand's first production run, a supplier cutting corners on material grade, and six months later, an unlaunchable brand.
Thomas cancelled the order. He lost his deposit. He found a new supplier — one that provided material certifications and third-party spectrometer verification as part of the QC process. His brand launched four months late but launched clean. Two years later, his return rate sits at 2.1%.
The lesson is not "always use 316L." It is: specify the grade, verify the grade, and do not assume the invoice matches the metal.
Want to ensure your cases match the spec on your purchase order? Explore JOEFOX's QC process — material verification is built into every production batch.
Titanium: The Premium Differentiator That Justifies Its Price
Titanium occupies a unique position in the watch materials landscape. It is objectively superior to steel in weight reduction and biocompatibility. It carries a price premium that consumers understand and accept. It provides a clear, marketable differentiator — "aerospace-grade titanium" sells itself in a product listing title.
But it also introduces manufacturing complexity that most factories are not equipped to handle well. Choosing titanium means choosing your factory more carefully than you would for steel.
Grade 2 vs. Grade 5: The Critical Distinction
Titanium watch cases come in two grades, and they are not interchangeable. The difference between them is as significant as the difference between 304 and 316L steel.
Grade 2 Titanium (Commercially Pure):
- Composition: ~99.2% titanium with trace iron, oxygen, and carbon
- Hardness: 145–200 HV — similar to annealed 316L steel
- Density: ~4.51 g/cm³ (approximately 43% lighter than steel)
- Appearance: Darker matte grey; cannot achieve a high-polish mirror finish
- Machining: Moderate difficulty — gummy during cutting, prone to galling
- Cost: Moderate — higher than steel, lower than Grade 5
- Best applications: Matte-finished tool watches, military-style designs, field watches
Grade 5 Titanium (Ti-6Al-4V):
- Composition: 90% titanium, 6% aluminum, 4% vanadium
- Hardness: 300–350 HV — significantly harder than 316L steel
- Density: ~4.43 g/cm³ (approximately 44% lighter than steel)
- Appearance: Capable of high-quality polished finishes with brushed/polished contrast
- Machining: Difficult — high tool wear, slow cutting speeds, specialized tooling required
- Cost: High — 2–3× the per-case cost of 316L steel
- Best applications: Premium sport watches, dive watches, any design requiring mixed finishing
If you are considering titanium for your brand, use Grade 5. Grade 2 scratches similarly to steel but without the polish-recovery option — the matte surface shows wear marks as permanent lighter streaks. Grade 5 resists scratching better than steel (due to its higher HV) and can be finished to a standard that justifies a premium retail price.
Performance Data
| Property | Grade 2 Titanium | Grade 5 Titanium (Ti-6Al-4V) |
|---|---|---|
| Vickers Hardness | 145–200 HV | 300–350 HV |
| Density | ~4.51 g/cm³ | ~4.43 g/cm³ |
| Weight vs. 316L Steel | 43% lighter | 44% lighter |
| Tensile Strength | ~345 MPa | 895–1,000 MPa |
| Corrosion Resistance (Saltwater) | Excellent — surpasses steel | Excellent — same as Grade 2 |
| Biocompatibility | Nickel-free, hypoallergenic | Nickel-free, hypoallergenic |
| Mirror Polish Capability | Poor — limited to brushed/matte | Good — holds defined chamfers |
| CNC Machining Cost Factor | ~3–4× vs. steel | ~5–6× vs. steel |
| Galling Risk | High — requires countermeasures | High — requires countermeasures |
The Manufacturing Reality
Titanium is hard on tools. Its low thermal conductivity means that heat generated during CNC machining does not dissipate through the metal chips — it concentrates at the cutting edge. This causes rapid tool wear, micro-welding of titanium to the tool surface, and, if cutting speeds and coolant pressures are not precisely managed, case deformation.
A titanium case takes approximately 30–50% longer to machine than an equivalent steel case. The scrap rate is higher — a single polishing error can ruin a case entirely. Tooling costs run higher because cutting tools wear out faster.
This is why the factory you choose matters more for titanium than for any other case material. A factory that has never produced titanium cases in volume will make expensive mistakes on your order. A factory with documented titanium production experience will have already solved the galling problems at screw-down crowns and caseback threads — the two failure points where inexperienced manufacturers lose entire batches.
Ask your factory three questions before placing a titanium order:
- "Show me photos of your last five titanium projects, including close-ups of the crown tube and caseback thread areas."
- "What anti-galling measures do you use at threaded interfaces?"
- "What is your titanium scrap rate on the last 100 units produced?"
If they hesitate on any of these, find another factory.
OEM Cost Reality
Titanium raw material costs approximately $68/kg — roughly 5× the cost of 316L bar stock. CNC machining time extends 30–50% per case. Tooling consumption increases. The result: a Grade 5 titanium case at 300–500 units costs approximately 2–3× the equivalent 316L steel case — typically $30–$75 per case depending on complexity and finishing requirements.
This cost must be justified by a higher retail price. The market supports it. Titanium watches in the $600–$1,200 range occupy a sweet spot where the material story, comfort advantage, and hypoallergenic positioning combine to create a genuine premium. Brands like Citizen (Super Titanium), IWC (Big Pilot Titanium), and Tudor (Pelagos) have already educated consumers that titanium means premium.
A Story from Amazon
Sarah launched her dive watch brand on Amazon in Q3 2024. She went with 316L stainless steel for her first SKU — the safe choice. It sold well. 4.3 stars, 2.8% return rate. Solid.
For her second SKU, she wanted to move upmarket. She designed a 42mm automatic diver and committed to Grade 5 titanium. Her factory warned her about the cost. She went ahead anyway.
She launched at $749. Her competitors in steel were at $349–$449. She was terrified.
The product went live. Within the first week, a YouTube reviewer with 40,000 subscribers posted an unboxing. The thumbnail said "Finally — A Titanium Diver Under $800." The video got 85,000 views.
Three months in, her titanium SKU was outselling her steel SKU 2:1 despite costing nearly twice as much. Her return rate on the titanium model: 1.4%. Customer reviews consistently mentioned two things — "incredibly light on the wrist" and "no skin irritation" (she had targeted the nickel-allergy market in her listing copy).
This is what titanium does when executed well. It pulls your brand into a pricing tier where margins expand and competition thins. It is not a material choice — it is a positioning choice.
Ready to explore titanium for your next collection? Contact JOEFOX for a titanium case sample — we machine Grade 5 titanium in-house at our Guangzhou facility.
Zinc Alloy: When Cheap Costs Too Much
Let's be direct: zinc alloy watch cases exist for one reason — price. At $1.20–$5 per case at OEM volumes, alloy cases enable retail price points that stainless steel cannot touch. If you are selling $12–$29 fashion watches through Facebook ads, TikTok Shop, or street markets, alloy is what makes your unit economics work.
The problem is that alloy's advantages end at the checkout page. Everything that happens after purchase — wear, corrosion, plating failure, customer complaints — works against you. You need to understand exactly what you are choosing, because choosing alloy means choosing a business model built on volume and churn rather than reputation and repeat purchases.
What Zinc Alloy Actually Is
Watch-grade zinc alloys are typically Zamak-series materials — Zamak 3, Zamak 5, or Zamak 7. Zamak 5 (ZnAlCuMg) is the most common for watch cases because it offers the best balance of castability, strength, and surface finish potential.
The manufacturing process is fundamentally different from steel and titanium. Alloy cases are die-cast — molten zinc is injected into a mold at high pressure, filling complex cavity shapes in seconds. Cycle times are fast. Tooling costs are low. Complex designs that would require expensive multi-axis CNC machining in steel can be cast directly into an alloy case.
The catch: zinc alloy has no inherent corrosion resistance. None. Every alloy watch case relies entirely on surface plating — chrome, nickel, PVD, or paint — to create a barrier between the zinc and the environment. When that barrier fails, the zinc corrodes. Fast.
Performance Data
| Property | Zinc Alloy (Zamak 5) |
|---|---|
| Hardness (Brinell) | 80–110 HB (~70–90 HV equivalent) |
| Density | ~6.6 g/cm³ |
| Salt Spray Resistance (unplated) | 24–48 hours to visible corrosion |
| Salt Spray Resistance (chrome plated) | 72–120 hours |
| Tensile Strength | 320–400 MPa |
| Plating Adhesion | Variable — dependent on surface prep and plating quality |
| Refinishable | No — once plating fails, case is unsalvageable |
| OEM Case Cost | $1.20–$5.00 per unit |
The Plating Problem
Here is what happens to an alloy watch over time, step by step:
Month 1–3: The plating looks fine. The customer is happy. Reviews are positive.
Month 4–8: Micro-abrasion from daily wear — against desks, sleeves, skin — begins to thin the plating at high-contact points: the caseback edge, the lug undersides, the crown. Sweat penetrates through microscopic pores in the plating.
Month 9–12: The zinc substrate begins to oxidize. Zinc oxide forms beneath the plating, causing it to bubble and lift. The customer notices "peeling" at the caseback. They leave a 1-star review.
Month 12–18: Exposed zinc corrodes further. Greenish-white oxidation products become visible. The watch is now unwearable. The customer files a return if still within the window, or simply discards the watch and never buys from the brand again.
This timeline accelerates in humid climates, for customers who sweat heavily, and for watches worn during exercise. In tropical markets — Southeast Asia, coastal Latin America, the Gulf states — alloy case failure can begin within 90 days.
When Alloy Makes Business Sense
Alloy is not universally wrong. It is wrong for the wrong application. Use alloy when:
- Your retail price is under $30 and your target customer is buying on impulse
- Your business model relies on one-time purchases rather than repeat customers or brand loyalty
- You are testing a design concept and need minimum viable production cost
- Your market (e.g., fast fashion, promotional merchandise) has no expectation of longevity
Do not use alloy when:
- You are building a brand you want customers to return to
- You sell on Amazon (return rates above 10% will tank your listing)
- Your target retail price is above $50 (customers at this price point expect durability)
- You are targeting markets with strong consumer protection laws (EU, Australia)
A Story from a Trade Show
At the 2024 Hong Kong Watch & Clock Fair, I watched a distributor from Dubai pick up two near-identical chronograph watches from two different booths. One was a zinc alloy case with chrome plating — retail target $28. The other was 316L stainless steel — retail target $89.
He held both. He turned them over. He scratched the casebacks with his thumbnail — an old buyer's trick. The alloy case showed a faint line where the plating compressed. The steel case was unmarked.
He put the steel watch down and picked up the alloy one again. "I can sell 10,000 of these in six months," he said to the factory rep. "And in 12 months, I will have 10,000 customers who will never buy from me again. That math worked in 2015. It doesn't work now."
He placed an order for the steel chronograph. Smaller quantity. Higher unit cost. Better long-term math.
This is the alloy decision distilled to its essence: it's not about whether you can make it cheaper. It's about whether your business model can absorb the cost of the customers you'll lose.
Head-to-Head Comparison: The Only Table You Need
| Decision Factor | 316L Stainless Steel | Titanium Grade 5 | Zinc Alloy |
|---|---|---|---|
| Case Hardness | 150–200 HV | 300–350 HV | ~70–90 HV |
| Weight (42mm case) | ~65–80g | ~35–45g | ~50–60g |
| Salt Spray to Failure | 500–1,000+ hrs | 1,000+ hrs | 48–120 hrs (plated) |
| Corrosion Mechanism | Self-healing Cr₂O₃ layer | Self-healing TiO₂ layer | Plating-dependent — no inherent resistance |
| Hypoallergenic | Low nickel leach (ISO 10993-10) | Zero nickel — fully biocompatible | Depends on plating (nickel underlayer common) |
| Polish Quality | Excellent — mirror + brushed contrast | Good — defined chamfers (Grade 5) | Good initially — degrades as plating wears |
| Repairability | Polish and refinish — near-infinite | Difficult — oxide layer complicates refinishing | None — disposable after plating failure |
| OEM Case Cost (300–500 pcs) | $12–$25 | $30–$75 | $1.20–$5 |
| Target Retail Price | $79–$299 | $600–$1,200 | $10–$49 |
| Amazon Return Rate (typical) | 2–4% | 1–3% | 10–18% |
| Brand Perception | Premium, established | Elite, modern, technical | Budget, disposable |
| Best Channel | Amazon, DTC, retail | DTC, specialty retail | TikTok Shop, street markets, promo |
How to Choose: A Decision Framework for Watch Brand Owners
If You Sell on Amazon (Any Price Above $40)
Use 316L stainless steel. Full stop.
Amazon's watch category return rate averages 7.8%. Sellers using properly specified 316L cases with verified material composition report rates between 2% and 4%. The difference — roughly 4 percentage points — is the line between a healthy Amazon business and one bleeding margin to return processing.
Amazon customers read reviews before buying. They search for "rust," "peeling," "faded," "broke." Those keywords appear disproportionately on alloy watch listings. They do not appear on 316L listings. Your material choice determines your review profile, and your review profile determines your conversion rate.
If your Amazon price point is $80+, consider offering a titanium variant as a premium SKU. The higher price point attracts a different customer segment with lower return rates and higher lifetime value. The material story ("aerospace-grade titanium") performs exceptionally well in A+ Content modules.
If You Are Building a DTC Brand
Your material should match your brand narrative:
- Heritage / classic / dress watch brand → 316L stainless steel. The default. The expectation. The material that looks right in every context.
- Sport / adventure / outdoor brand → Titanium Grade 5. The weight advantage matters for all-day activity wear. The hypoallergenic story opens the nickel-allergy market (an estimated 10–15% of the population). The premium pricing funds better margins.
- Budget fashion / trend-driven brand → Alloy, but with a plan. Understand your return rate will be higher. Build that cost into your margin model. And have a migration path to steel for when you want to move upmarket.
If You Are Launching Your First Collection
Start with 316L stainless steel. Here is why:
It is the most forgiving material for a new brand. You can polish out production flaws. You can refinish cases that get scratched during assembly or shipping. Your factory has done this material thousands of times — the learning curve is already absorbed. And if your launch goes well, the material scales: move to titanium for your second collection as a premium tier.
Starting with alloy and trying to "graduate" to steel later means rebuilding your entire supply chain, repositioning your brand with your existing customers, and potentially cannibalizing your own product line. It is better to start where you want to end up.
The Movement Connection: Why Case and Movement Decisions Are Linked
Your case material choice interacts with your movement choice in ways that first-time brand owners often miss.
A heavy 316L steel case with a cheap quartz movement: the watch feels premium when held, but the movement underdelivers relative to the case quality. Customers may not articulate this, but they feel the disconnect — "nice watch, but the second hand doesn't align with the markers."
A lightweight titanium case with an automatic mechanical movement: the combination works brilliantly. The light case offsets the heavier automatic movement, resulting in a balanced feel on the wrist. This is why titanium divers with automatic movements — Tudor Pelagos, Omega Seamaster Titanium — feel so right: the engineering logic is coherent.
An alloy case with any decent movement: a waste of a good movement. The case will fail before the movement reaches even a quarter of its service life.
We cover movement selection in depth in our watch movement types guide for OEM brands — the movement and case decisions should be made together, not sequentially.
The Private Label Playbook: Material as Your Brand's Foundation
When you manufacture watches under your own brand — whether through private label or full OEM — the case material is the foundation on which your entire brand identity is built.
Your logo goes on the dial. Your packaging carries your name. But your case material is what the customer lives with every day. It is the most permanent element of the watch, and the most expensive to change mid-production.
Brands that build on 316L steel can expand into titanium, ceramic, or precious metal plating as they grow. The customer base trusts the brand's quality baseline, and premium material upgrades feel like natural progression.
Brands that build on alloy rarely escape the budget tier. The customer base associates the brand with disposability. Attempting to launch a $200 steel collection under the same brand that sold $25 alloy watches creates cognitive dissonance that customers resolve by ignoring the new collection entirely.
This is why the largest private label watch manufacturers in China steer new brands toward 316L as their starting material — not because it generates more revenue per unit, but because the brands that start with steel survive long enough to place second and third orders.
How JOEFOX Approaches Case Material Selection
Since 1990, our Guangzhou factory has produced watch cases in every grade of material covered in this guide. We have seen brands succeed and fail with every combination, and the pattern is unmistakable: the brands that survive their first two years choose their case material intentionally, not by accepting the cheapest factory default.
Material Verification as Standard. Every batch of raw material entering our facility is verified with XRF spectrometry before machining begins. If the chromium, nickel, and molybdenum percentages do not match 316L specification, the batch is rejected. This is not optional — it is the only way to guarantee that what you specify is what you receive. Titanium Capability In-House. We machine Grade 5 titanium on dedicated CNC lines with optimized tooling, coolant systems, and anti-galling protocols at threaded interfaces. Our titanium scrap rate is under 5% — competitive with industry benchmarks for this notoriously difficult material. Transparent Material Pricing. Our quotes break out material cost separately from machining and finishing. You know exactly what you are paying for the metal, and you can make informed trade-offs between materials without guesswork.
If you are evaluating case materials for your next production run — or starting from scratch with a new brand — reach out for a material sample kit. We will send you 316L, titanium, and alloy cases in the same design so you can feel the difference before committing to an order.
Contact JOEFOX for Material Samples →
References and Further Reading
The data in this guide draws from the following sources and standards:
- ASTM B117 — Standard Practice for Operating Salt Spray (Fog) Apparatus
- ISO 10993-10 — Biological Evaluation of Medical Devices (Skin Sensitization)
- ISO 9223 — Corrosion of Metals and Alloys (Corrosivity of Atmospheres)
- ASTM B86 — Standard Specification for Zinc and Zinc-Aluminum Alloy Foundry and Die Castings
- Vickers hardness testing per ASTM E384
- Industry salt spray data: 316L (500–1,000+ hours), 304 (96–500 hours), 201 (24–72 hours)
- Zinc alloy salt spray (plated): 48–120 hours (dependent on plating quality and thickness)
- Amazon watch category: average return rate 7.8%, 316L sellers under 4%, alloy sellers 10–18%
Last updated: August 8, 2026. JOEFOX Watch Factory, Guangzhou, Guangdong, China. Est. 1990.
The dial and hands give the case its personality — see our custom watch dials design guide for materials, finishes, and MOQs. The crown is what seals the case you've chosen — our watch crown spec guide covers screw-down vs push-pull, sealing, and logo engraving.