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M3 DIN933 Hex Screw
QS Fastener: M3 DIN933 Hex Screw
Name: M3 DIN933 Hex Screw
Standard: DIN933
Material: SS304
Size: M3
Lenght: 10
Surface: Natural color
Standard: DIN933
Material: SS304
Size: M3
Lenght: 10
Surface: Natural color
Quantity
M3 DIN933 Hex Screw is made from SS304 stainless steel with a natural surface finish. It offers a standard 10 mm length along with excellent corrosion resistance and tensile strength, making it ideal for precision equipment, food machinery and outdoor applications. Easy to install and consistently reliable, M3 DIN933 Hex Screw enhances assembly dependability and brand quality.
M3 DIN933 Hex Screw surface treatments
1. Pickling / Passivation
A two-step process defined by ASTM A380: ① Pickling in 15–25 % HNO₃ + 1–3 % HF (by volume) at 50–60 °C for 5–15 min removes heat-tint and the chromium-depleted layer from M3 DIN933 Hex Screw; ② Passivation in 20–45 % HNO₃ for 30 min at 40–50 °C increases the Cr₂O₃ passive film thickness to 2–3 nm and raises the pitting potential Eₚ by ≥150 mV. After treatment, M3 DIN933 Hex Screw exhibits a surface roughness Ra of 0.8–1.6 μm and residual Cl⁻ <0.1 μg cm⁻², meeting the corrosion-resistance requirements of ASTM F593/F594 for 18-8 stainless fasteners, suitable for general atmospheric and mildly corrosive environments.
1. Pickling / Passivation
A two-step process defined by ASTM A380: ① Pickling in 15–25 % HNO₃ + 1–3 % HF (by volume) at 50–60 °C for 5–15 min removes heat-tint and the chromium-depleted layer from M3 DIN933 Hex Screw; ② Passivation in 20–45 % HNO₃ for 30 min at 40–50 °C increases the Cr₂O₃ passive film thickness to 2–3 nm and raises the pitting potential Eₚ by ≥150 mV. After treatment, M3 DIN933 Hex Screw exhibits a surface roughness Ra of 0.8–1.6 μm and residual Cl⁻ <0.1 μg cm⁻², meeting the corrosion-resistance requirements of ASTM F593/F594 for 18-8 stainless fasteners, suitable for general atmospheric and mildly corrosive environments.
2. Electropolishing Ra ≤0.4 μm
Per ISO 15730, using an electrolyte of 70 % H₃PO₄ + 15 % H₂SO₄ + 15 % CrO₃, a current density of 30–60 A dm⁻² at 55–65 °C for 2–4 min preferentially dissolves micro-peaks, producing a super-finished surface on M3 DIN933 Hex Screw with Ra ≤0.4 μm and Rz ≤2 μm while reducing micro-defects (≥2 μm) by 90 %. The passive film grows to 5–10 nm with a Cr/Fe atomic ratio ≥1.8, raising the pitting potential by another 100 mV. Surface energy drops by 25 %, giving M3 DIN933 Hex Screw a torque coefficient K ≈0.10–0.12 and markedly lowering galling tendency—ideal for high-purity food, semiconductor and medical fasteners.
Per ISO 15730, using an electrolyte of 70 % H₃PO₄ + 15 % H₂SO₄ + 15 % CrO₃, a current density of 30–60 A dm⁻² at 55–65 °C for 2–4 min preferentially dissolves micro-peaks, producing a super-finished surface on M3 DIN933 Hex Screw with Ra ≤0.4 μm and Rz ≤2 μm while reducing micro-defects (≥2 μm) by 90 %. The passive film grows to 5–10 nm with a Cr/Fe atomic ratio ≥1.8, raising the pitting potential by another 100 mV. Surface energy drops by 25 %, giving M3 DIN933 Hex Screw a torque coefficient K ≈0.10–0.12 and markedly lowering galling tendency—ideal for high-purity food, semiconductor and medical fasteners.
3. PTFE / Xylan coating
Following ASTM D3294, a two-coat, two-bake process applies a zinc-phosphate primer 5–8 μm thick and a PTFE (or PAI-bonded Xylan 1070/1424) top-coat 15–25 μm thick for a total thickness of 20–30 μm. Curing at 385 °C for 15 min yields a continuous fluoropolymer film with 68 % fluorine content, giving M3 DIN933 Hex Screw a friction coefficient µ=0.04–0.08 and 1 000 h salt-spray resistance (ASTM B117). The coating’s dielectric strength is 60 kV mm⁻¹ and its service temperature range is –195 °C to +260 °C, while it can absorb 0.05 mm assembly tolerance, preventing galvanic corrosion and seizing—widely used on high-strength bolts in marine, chemical and wind-power sectors.
Following ASTM D3294, a two-coat, two-bake process applies a zinc-phosphate primer 5–8 μm thick and a PTFE (or PAI-bonded Xylan 1070/1424) top-coat 15–25 μm thick for a total thickness of 20–30 μm. Curing at 385 °C for 15 min yields a continuous fluoropolymer film with 68 % fluorine content, giving M3 DIN933 Hex Screw a friction coefficient µ=0.04–0.08 and 1 000 h salt-spray resistance (ASTM B117). The coating’s dielectric strength is 60 kV mm⁻¹ and its service temperature range is –195 °C to +260 °C, while it can absorb 0.05 mm assembly tolerance, preventing galvanic corrosion and seizing—widely used on high-strength bolts in marine, chemical and wind-power sectors.
4. Non-magnetic: μr ≤1.2 (after solution treatment)
Per ASTM A342, 316L (≤0.03 %C) is solution-treated at 1 050 °C for 30 min and water-quenched, limiting δ-ferrite content to ≤0.5 % and reducing dislocation density to 10¹⁰ m⁻². The relative permeability of M3 DIN933 Hex Screw drops to 1.005–1.20, coercivity Hc <10 A m⁻¹ and magnetic flux density B <0.05 T under an external field of 4 000 A m⁻¹. This meets stringent MRI and particle-accelerator requirements for magnetic interference ≤0.1 µT while maintaining tensile strength Rm ≥515 MPa and elongation A ≥40 %.
Per ASTM A342, 316L (≤0.03 %C) is solution-treated at 1 050 °C for 30 min and water-quenched, limiting δ-ferrite content to ≤0.5 % and reducing dislocation density to 10¹⁰ m⁻². The relative permeability of M3 DIN933 Hex Screw drops to 1.005–1.20, coercivity Hc <10 A m⁻¹ and magnetic flux density B <0.05 T under an external field of 4 000 A m⁻¹. This meets stringent MRI and particle-accelerator requirements for magnetic interference ≤0.1 µT while maintaining tensile strength Rm ≥515 MPa and elongation A ≥40 %.
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