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M4 Stainless Steel 316 Thread Rod
QS Fastener: M4 Stainless Steel 316 Thread Rod
Name: M4 Stainless Steel 316 Thread Rod
Standard: DIN976
Material: SS316
Size: M4
Lenght: 1000mm
Surface: Natural color
Standard: DIN976
Material: SS316
Size: M4
Lenght: 1000mm
Surface: Natural color
Quantity
M4 Stainless Steel 316 Thread Rod is manufactured in strict accordance with DIN 976, using marine-grade SS316. The standard length is 1000 mm and can be cut to size. Its naturally passivated surface resists chloride ions, acids and alkalis, making it ideal for framing connections, anchoring and adjustable bracing in highly corrosive environments such as marine, chemical and food industries. It combines high strength with an exceptionally long service life and is the reliable choice for premium assemblies.
316 stainless-steel fasteners are listed as the “default first choice” by high-end equipment builders, coastal construction, chemical systems and food/pharmaceutical lines because they strike the best balance in the corrosion–strength–cost triangle. Taking the M4 Stainless Steel 316 Thread Rod as an example, this typical product concentrates every advantage of 316 into each millimetre of thread.
1. The alloy contains 2.0–3.0 % molybdenum, so the passive film self-repairs rapidly in chloride environments; resistance to pitting and crevice corrosion is nearly four times higher than that of 304. After 1000 h salt-spray testing the rust-stained area on 316 is <1 %, whereas on 304 it exceeds 10 %.
2. 316 retains the face-centred-cubic austenitic structure: yield strength ≥205 MPa and tensile strength ≥520 MPa at room temperature; toughness does not drop at low temperature—impact energy at –196 °C is still ≥100 J—meeting the fastening requirements for LNG and liquid-oxygen piping. Consequently M4 Stainless Steel 316 Thread Rod is often used in cryogenic pipe-clamp adjustable supports/hangers.
3. Life-cycle cost is lower: although the material price is ~25 % higher than 304, M4 Stainless Steel 316 Thread Rod can be used for 30 years without replacement on offshore platforms, in FGD towers or over swimming-pool roofs, whereas 304 usually seizes or rusts solid after 5–10 years, so combined repair, downtime and labour costs end up 2–3 times higher.
4. 316 has broad corrosion resistance to organic acids, sulphuric acid and alkaline solutions. In pulp-bleaching sections (pH 2, 80 °C, chlorinated medium) its corrosion rate is <0.025 mm/yr, whereas 2205 duplex can suffer local over-passivation and pitting. Chemical giants therefore list 316 as the “universal fallback grade” and purchase M4 Stainless Steel 316 Thread Rod in bulk as a standard fastening unit.
5. Food-grade safety: the low-carbon 316L version shows heavy-metal migration <0.1 mg/dm² after nitric–hydrofluoric immersion, meeting GB 4806.9-2016 and FDA 21 CFR 175.300. It can contact high-salt or high-acid food directly, eliminating the food-safety risk of flaking zinc coatings. M4 Stainless Steel 316 Thread Rod is therefore found in beverage filling lines and the clean zones of seawater-desalination plants.
6. Machining and welding friendly: the cold-work hardening rate of 316 is lower than that of 304; ordinary high-speed-steel taps give clean threads and tap-breakage rate falls by 40 %. No pre-heat is required for welding and no post-weld heat treatment is needed to keep grain boundaries free of carbide precipitates; on-site maintenance needs only a portable TIG set. M4 Stainless Steel 316 Thread Rod can be cut to length and re-threaded on site, greatly reducing installation difficulty.
In short, when a project is near the coast, exposed to chlorides, demands long-term maintenance-free service, or involves high-purity media in food, pharmaceutical or semiconductor sectors, 316 stainless-steel fasteners offer the reliability of “choose once, never replace”. They are the solution that saves designers worry, owners money and maintenance crews effort. M4 Stainless Steel 316 Thread Rod is precisely the best realisation of this philosophy in small-scale, standardised applications.
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