Product Overview

Our Grade 12.9 Socket Head Cap Screws are manufactured from high-quality alloy carbon steel with precise heat treatment, delivering an ultimate tensile strength up to 1220 MPa. Featuring black oxide surface finishing, these allen bolts offer reliable rust resistance, great wear resistance and stable performance under heavy load.

With standard internal hexagon sockets, deep and uniform threads, our screws avoid slipping during installation and deliver even force distribution. We supply a complete size range from M1.4 to M64, fully compliant with national and ISO standards, widely used in machinery, automation, mould, construction, vehicle and equipment assembly.

Supported by strict quality control, consistent craftsmanship and large inventory capacity, we provide stable bulk supply for distributors, engineering contractors and manufacturers worldwide. Custom packaging and bulk order support are available.

Key Features

• ✅ Grade 12.9 High Tensile Strength
Alloy steel material, high hardness, suitable for heavy-load fastening scenarios.

• ✅ Precision Standard Hex Recess
Standard inner hexagon cavity, fits allen wrenches perfectly, effectively prevent slipping off during installation.

• ✅ Deep & Even Threads
Uniform, sharp threads for smooth screwing, stable clamping force and long service life.

• ✅ Black Oxide Finish
Improves wear resistance and offers basic anti-rust protection for indoor & dry working environments.

• ✅ Complete Size Selection
Full specification range from tiny M1.4 up to M64, meet diverse engineering requirements.

• ✅ Strict Quality Inspection
Every batch goes through quality testing to guarantee stable mechanical performance.