Allen Cap Bolts – SM Fastners

Overview

At SM Fasteners, we manufacture and supply a wide range of Socket Head Cap Screws (Allen Bolts) designed for compact assemblies requiring high torque strength. Our Allen bolts are crafted using alloy steel (Grades 8.8 / 10.9 / 12.9) or A2/A4 stainless steel, conforming to DIN 912 / ISO 4762 / BS 4168 standards. With precise internal hex drive and corrosion-resistant finishes, they are trusted worldwide in machinery, automotive, robotics, and toolmaking industries.

Table of Contents

Features:

Internal hex drive head — perfect for tight spaces
Made from high-grade alloy and stainless steel
Excellent tensile strength and corrosion resistance
Consistent thread pitch with chamfered ends
Available in zinc, black oxide, plain, and SS finish
Metric & imperial sizes, custom lengths on request

Technical Specifications

Parameter	Description
Standard	DIN 912, ISO 4762, BS 4168
Size Range	M3 to M30 (custom available)
Lengths	8mm to 200mm
Material	Alloy Steel (Grades 8.8 / 10.9 / 12.9), Stainless Steel A2/A4
Finish	Zinc Plated, Black Oxide, Hot-Dip Galvanized, SS Polished
Thread Type	Metric Coarse, Metric Fine
Drive	Internal Hex Socket (Allen Key)
Certifications	ISO 9001, CE Marking, MTC

Why Our Allen Cap Bolts?

✅ Precision Engineering

Our Allen cap bolts are crafted with unmatched dimensional accuracy to ensure a tight, secure fit in high-tolerance assemblies. Each bolt is engineered to meet or exceed industry standards like ISO, DIN, and ASTM.

✅ Superior Strength

Made from high-grade alloy or stainless steel, our bolts are heat-treated for maximum tensile strength and durability — ideal for critical load-bearing applications in machinery, robotics, automotive, and industrial environments.

✅ Corrosion Resistance

Whether you’re working in a humid climate, a coastal zone, or a high-wear production line, our bolts offer outstanding resistance to rust and corrosion thanks to premium coatings such as black oxide, zinc plating, or full stainless steel options.

✅ Clean Finish

With a smooth, uniform surface and sharp hex socket recess, our Allen bolts not only perform well — they look professional in any assembly. No burrs, rough edges, or inconsistent finishes.

✅ Easy Installation

The hex socket head allows for quick, hassle-free tightening using standard Allen keys or hex wrenches — even in confined or recessed spaces. Reduced risk of slippage or stripping.