Product Overview

Stainless Steel Hex Socket Head Cap Screws, also known as Allen screws, are high-strength, concealed fasteners featuring an internal hex drive recess in their cylindrical heads. The cylindrical head design allows them to be installed flush with countersunk holes, saving installation space while providing a neat and compact assembly appearance.

Parameters

Item	Specification
Product Name	Stainless Steel Hex Socket Head Cap Screws
Material	Stainless Steel
Executive Standard	DIN 912
Compliance Certificate	ISO 4762
Material Grade	SS201, SS304, SS316
Nominal Diameter Range	M4 – M36
Surface Treatment	ZP (Zinc Plated), YZ (Yellow Zinc Plated), BLACK (Black Oxide Finish)

Product Advantages

Advantage 1

The sunken hexagonal socket uses standard Allen hex keys for tightening, allowing full countersunk flush mounting inside component counterbores. No protruding external head to interfere with moving parts, perfect for narrow confined cavities, precision instrument internal assembly and streamlined equipment exterior aesthetic assembly, impossible for external hex bolts to install.

Advantage 2

Six-sided inner hex evenly distributes tightening torque, supporting high preload tension without tool slipping under heavy torque. Delivers higher clamping force than cross recess screws, maintaining stable fastening tension under mechanical vibration, cyclic load and temperature fluctuation, preventing loosening in continuous-operation automated machinery.

Advantage 3

Short cylindrical cap occupies minimal axial space, protecting adjacent wiring, moving parts and delicate workpiece surfaces. The smooth rounded head avoids scratch damage to operators and peripheral components after installation.