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JIALI launches Stainless Steel zone with full 304 / 316 range

2026-08-12

Compiled by JIALI Industrial (164.hk) — a Hong Kong fastener supplier specialising in screws, bolts, nuts and selection know-how.

Why we created a separate stainless steel zone

Hong Kong is surrounded by sea on three sides, and relative humidity stays above 70% for most of the year, while chloride deposition along the coast and on outlying islands runs far higher than in inland cities. In that environment, ordinary zinc-plated carbon steel parts typically start showing white rust within six months to a year, turn to red rust within one to two years, and once the coating is breached, corrosion spreads quickly from the damage. In the past, customers looking for stainless parts had to work through hundreds of line items one by one, checking grade and availability each time — a slow and error-prone process. So we pulled the stainless range out of the general catalogue into its own zone, setting out material, sizes, finishes and available documentation in one place so a buyer can settle the specification in a single pass. This is not just a catalogue reshuffle; behind it is a reworked stock structure aimed at coastal conditions: the most-used M4–M16 sizes are held as local stock, while larger or special sizes are made to order, so common requirements can ship the same day.

What the zone covers and what we can supply

The zone spans six families — stainless bolts, nuts, washers, threaded rods, set screws and self-tapping screws — in standard sizes from M3 to M48, including socket head cap screws (DIN 912 / GB/T 70.1), hex head bolts (DIN 933 / GB/T 5783), hex nuts (DIN 934), flat washers (DIN 125) and spring washers (DIN 127). Three material tiers are available: 304 (A2) for general use, 316 / 316L (A4) for chloride resistance, and 2205 duplex (S32205) where high strength and corrosion resistance are both required. The standard finish is natural with passivation (ASTM A967), with electropolishing, black oxide or bead-blasted matte available as options; where galling resistance matters, an MoS₂ or PTFE dry-film lubricant can be added. Supply runs on two tracks: M3–M16 standard sizes are held as stock in our Hong Kong warehouse and can ship same day or next day, while M18 and above, 2205 duplex and non-standard shapes are made to order in typically 7–15 working days. Every stainless shipment can be accompanied by an EN 10204 3.1 material certificate and, on request, an ASTM B117 salt-spray report — often a prerequisite for project acceptance.

Choosing between 304, 316 and 2205

The first question is not price but chloride concentration and load. For dry indoor or mildly humid conditions (server rooms, indoor equipment frames), 304 is sufficient and offers the best value. Coastal, marine, chemical and food-washdown environments call for 316, where 2–3% molybdenum markedly improves pitting and crevice corrosion resistance. Where high strength and high corrosion resistance are both needed — curtain wall brackets, bridge railings, offshore platform attachments — 2205 duplex offers roughly twice the yield strength of 304 (≥ 450 MPa), letting you downsize the fastener and reduce the number of connection points. Two myths are worth flagging. First, stainless is not automatically rust-proof: in chloride media, even 316 can pit above roughly 200 ppm chloride or 60 °C, and only a higher alloy or a lower chloride level will solve it. Second, mixing stainless bolts with carbon steel parts invites galvanic corrosion that attacks the carbon steel — use isolating washers or match materials within the same family.

Three pitfalls in service and what to check at acceptance

Beyond material selection, three practical pitfalls deserve attention. Galling: stainless threads can cold-weld and seize during tightening, especially 304 / 316 running against the same grade of nut — apply an anti-galling compound, control tightening speed and avoid over-torquing. Passivation treated as optional: machining leaves free iron on the surface, and without passivation (ASTM A967) rust spots often appear within a week in humid conditions, so passivation should be a standard step rather than an add-on. Traceability ignored until too late: engineering projects usually require EN 10204 3.1 certificates and sometimes third-party test reports, and these must be agreed at the order stage — arranging them afterwards is often impossible within the project timeline. Need selection advice or sample certificates for stainless fasteners? Contact JIALI Industrial (164.hk) with your environment and load conditions.

Related Reading

• JIALI exhibits at Hong Kong International Hardware Show
• JIALI upgrades warehousing — faster lead time for regular items
• Fastener purchase contracts and drawing tolerances: getting the quality requirements right the first time

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