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M6-1 X 12 Hex Bolt
QS: M6-1 X 12 Hex Bolt
Name: M6-1 X 12 Hex Bolt
Standard: DIN 933
Material: D2-80
Size: M6-1
Lenght: 12 mm
Surface: Natural color
Standard: DIN 933
Material: D2-80
Size: M6-1
Lenght: 12 mm
Surface: Natural color
Quantity
M6-1 X 12 Hex Bolt is manufactured to DIN 933 with a fully rolled thread and 12 mm overall length. Fabricated from duplex stainless steel D2-80, it delivers a tensile strength ≥ 800 MPa and pitting / stress-corrosion resistance well beyond 316L. The natural, uncoated finish allows long-term service in humid, acidic, alkaline or marine environments without additional plating, while the lightweight design cuts equipment weight by more than 15 %. Stable torque transmission and one-shot high preload retention make M6-1 X 12 Hex Bolt the ideal fastener for precision machinery, seawater desalination plants and high-end kitchen appliances.
M6-1 X 12 Hex Bolt is forged from duplex stainless steel with an optimised α-ferrite ≈ 50 % + γ-austenite ≈ 50 % microstructure. Verified to GB/T 3098.6 and ISO 3506-6, M6-1 X 12 Hex Bolt exhibits room-temperature tensile strength Rm ≥ 800 N/mm² (measured 820–850 N/mm²), 0.2 % proof stress Rp0.2 ≥ 600 N/mm² (measured 640–680 N/mm²), elongation A50 ≥ 25 % and hardness HV10 280–320. Compared with 304 (Rm ≈ 520 N/mm², Rp0.2 ≈ 210 N/mm²), M6-1 X 12 Hex Bolt offers over 50 % higher strength, enabling smaller diameters or a 15–20 % weight reduction under the same preload.
Corrosion resistance is equally impressive: M6-1 X 12 Hex Bolt achieves PREN = Cr + 3.3 Mo + 16 N ≥ 34, far exceeding the ≈ 19 of 304. Neutral salt-spray tests (ISO 9227, 5 % NaCl, 35 °C, continuous spray) show 304 specimens rusting at 48 h and > 5 % coverage at 200 h, whereas M6-1 X 12 Hex Bolt remains spot-free at 500 h and < 1 % rust at 1000 h—corrosion rate reduced by 2.3×. Critical pitting temperature (CPT) in 6 % FeCl₃ solution is ≥ 35 °C, 20 °C higher than 304 (≈ 15 °C). In boiling 40 % MgCl₂ solution, M6-1 X 12 Hex Bolt reaches an SCC threshold ≥ 320 MPa, ten times that of 304.
Anti-galling performance is validated by M6 × 1.0 bolt-nut cycling tests: under dry friction, after four tighten-loosen cycles at 20 N·m preload, threads on M6-1 X 12 Hex Bolt show neither seizure nor material pick-up, and removal torque drops by < 5 %. Thanks to the duplex structure’s high work-hardening exponent n ≈ 0.45 and evenly distributed Cr₂N precipitates, the surface friction coefficient μ falls to 0.11 versus 0.18 for 304, markedly reducing adhesive wear.
In summary, M6-1 X 12 Hex Bolt delivers 800 N/mm²-class strength combined with superior pitting, stress-corrosion-cracking and anti-galling capabilities. It directly replaces 304/316 fasteners in offshore structures, desulfurization towers, hydrogen systems and premium food-processing equipment, offering weight reduction, service-life extension and maintenance-free operation. The precisely engineered 12 mm length further positions M6-1 X 12 Hex Bolt as the first choice for compact-space connections.
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