Socket Head Shoulder Screws

Product Dimensions

Parameter	Specification
Product Type	Socket Head Shoulder Screw
Shoulder Diameter	Typically ranges from 4 mm to 20 mm
Thread Size	Commonly one size smaller than shoulder diameter (e.g., M6 shoulder with M5 thread)
Shoulder Length	Varies from 5 mm to 150 mm
Material Options	Alloy Steel, Stainless Steel, Carbon Steel
Standards	ISO 7379, DIN 9841, BS 4168, ASME B18.3
Surface Finish	Plain, Zinc Plated, Black Oxide, Hot-dip Galvanized

Industrial Applications

Socket Head Shoulder Screws are widely used in:

Machinery and automation: Act as precision shafts, pivots, and guides in moving parts.
Tool and die making: Used where slip or bearing surfaces are required.
Automotive assemblies: Provide accurate positioning and smooth movement for mechanical components.
Manufacturing jigs and fixtures: Serve as locating pins and pivot points.
Electronics and robotics: Offer smooth rotational or linear movement with high durability.

Product Description

Socket Head Shoulder Screws combine a hexagonal internal drive head with a precision-machined shoulder that is larger in diameter than the threaded part. The smooth shoulder section provides a durable bearing surface, allowing components to rotate or slide with minimal friction. The thread engages securely to fasten the assembly. These screws are heat-treated for strength and produced to tight tolerances for concentricity and smoothness of the shoulder, meeting ISO 7379 and related standards. Available materials include alloy steel for strength and stainless steel for corrosion resistance, with various surface finishes for environmental protection.

Product specifications

Shoulder Diameter Range: 4 mm to 20 mm typical (metric), and commonly available in inch sizes
Thread Size: Usually one size smaller than shoulder diameter (e.g., M10 shoulder with M8 thread)
Thread Length: Varies depending on screw length; designed for secure fastening with adequate grip
Head Dimensions: Hex socket size corresponds with ISO standards, allowing Allen key installation
Shoulder Length Range: From 5 mm up to 150 mm or longer on special order
Materials: Alloy steels (grade 12.9 typical), stainless steels (A2, A4), and carbon steel options
Surface Finishes: Plain (uncoated), zinc plated, black oxide, and hot-dip galvanized available
Mechanical Properties: Heat-treated with tensile strengths up to ~1,200 MPa depending on material
Standards: ISO 7379, DIN 9841, BS 4168, ASME B18.3
Applications: Ideal for pivot, shaft, and bearing applications with high wear resistance and precision
Operating Temperature Range: Approximately -50°C to +400°C depending on material and finish