Black Oxide Stainless Steel Allen Bolt Corrosion-Resistant Socket Head Cap Screw for Machinery Assembly

Deskripsi

What is an Allen Bolt?

A fastener with a cylindrical head and a hexagonal socket drive. Designed for high-torque applications and recessed installations where external wrench clearance is limited.

Material

• Alloy Steel: Most common for high strength; grades 10.9, 12.9 (Cr-Mo).

• Stainless Steel: A2 (304) general purpose, A4 (316) marine grade.

• Carbon Steel: Grades 4.8, 8.8 for general use.

• Titanium: Grade 5 for aerospace/motorsports (strength-to-weight ratio).

Surface Finishes

• Zinc Plating: Standard corrosion protection (72h+ salt spray).

• Zinc-Nickel: High-performance (144h+ salt spray), low hydrogen embrittlement.

• Black Oxide: Mild corrosion resistance, cosmetic finish.

• Passivation: For stainless steel, removes free iron.

• PTFE/Xylan: Low friction, chemical resistant.

Specifications

• Diameter (Metric): M3 to M48 (common: M3, M4, M5, M6, M8, M10, M12).

• Length: 6mm to 280mm+.

• Drive Size: M3=2.5mm, M4=3mm, M5=4mm, M6=5mm, M8=6mm, M10=8mm, M12=10mm.

• Strength Class: 8.8, 10.9, 12.9 (alloy); A2-70, A4-80 (stainless).

• Standards: DIN 912, ISO 4762.

Primary Applications

• Industrial Machinery: High-strength assemblies, vibrating equipment.

• Automotive: Engine, chassis, transmission components.

• Electronics: Compact devices, control panels.

• Marine: A4 stainless for boat building, outdoor hardware.

• Construction: Structural steel, architectural metalwork.

Best Practice Application Example

MRO replaces a worn conveyor clamp bolt with an M8 x 45mm alloy steel, class 10.9 Allen bolt, zinc-nickel plated. Installed in recessed bore using 6mm hex key. Achieves required clamp torque without cam-out. Zinc-nickel provides 144h+ corrosion resistance; 10.9 grade secures joint against vibration, preventing downtime.