Black 304 Stainless Steel Hexagon Hex Socket Cap Allen Head Screw Bolt M1.4-M8
Black 304 Stainless Steel Cup Head Hex Socket Screws (M1.4-M8) - Corrosion-Resistant Fasteners for Industrial & DIY Applications‌
 
‌Core Product Specifications‌
 
✓ ‌A2-70 Grade 304 Stainless Steel‌
 
18% chromium & 8% nickel composition with black oxide coating for enhanced corrosion resistance (salt spray resistance: 1500+ hours per ASTM B117) ‌
Tensile strength: ≥520 MPa | Yield strength: ≥210 MPa | Suitable for temperatures from -50°C to 400°C ‌
 
✓ ‌Full Size Range‌
 
‌Diameter‌ ‌Lengths Available‌ ‌Head Diameter‌ ‌Hex Key Size‌
M1.4 3-20mm (3mm increments) 2.6mm ±0.1mm 0.7mm
M1.6 4-25mm 3.0mm ±0.1mm 0.9mm
M2 5-30mm 3.8mm ±0.1mm 1.3mm
M2.5 6-35mm 4.5mm ±0.1mm 1.5mm
M3-M8 8-50mm (5mm increments) 5.5-13mm 1.5-5mm ‌
 
✓ ‌DIN 7991 Compliance‌
 
Precision ±0.05mm thread pitch tolerance for secure fastening ‌
Options: Full thread (100% engagement) / Partial thread (customizable) ‌
‌Key Advantages‌
 
✓ ‌Enhanced Durability‌
 
Ceramic-coated black finish (20μm thickness) prevents galvanic corrosion between dissimilar metals ‌
EPDM-integrated washer available for waterproof sealing in marine environments ‌
 
✓ ‌Multi-Industry Applications‌
 
‌Aerospace‌: Engine component assembly (M2-M5 sizes) ‌
‌Automotive‌: Chassis fixation & exhaust system mounting (M6-M8) ‌
‌Medical Devices‌: Surgical equipment & MRI machine assembly (M1.4-M2.5) ‌
‌Outdoor Electronics‌: Waterproof enclosures & solar panel installations ‌
 
✓ ‌User-Friendly Features‌
 
Deep 120° hex socket recess prevents tool slippage during high-torque operations ‌
Pre-lubricated threads reduce friction during installation ‌
‌Packaging & Services‌
‌Standard Packaging‌:
50/100/500pcs in resealable ESD bags with barcode labels ‌
Wax-sealed individual units for rust prevention ‌
‌Bulk Order Benefits‌:
MOQ 500pcs for custom lengths (5-60mm) ‌
24-hour dispatch & return shipping coverage ‌
‌eBay-Optimized Keywords‌
 
Black 304 Stainless Cup Head Screws M1.4-M8 | DIN7991 Hex Socket Bolts | Salt Spray 1500H Fasteners | Aerospace & Marine Grade Bolts | Ceramic-Coated Anti-Corrosion Screws
 
‌Compliance & Testing‌
Certifications: ISO 4762, ASTM F593, AS3566 Class 4 ‌
Performance tested:
1500H salt spray resistance (GBT10125) ‌
25-cycle acid rain simulation (GBT9789) ‌
Pull-out force ≥9000N (6mm steel plate) ‌
 
Note: Surface finish may show slight variations due to ceramic coating process
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●For the functional products in our shop, we make sure that the functions are the same as the description.
●About the product colour:Because of the different light and environment when the product is photographed, In a few instances the colour of the product may have a little colour difference with the actual colour of the product, I hope you can understand.
 

On Aug 3, 2025 at 10:05:14 PDT, seller added the following information:

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