Socket Head Shoulder Screws
Socket Head Shoulder Screws, also known as shoulder bolts, feature a smooth cylindrical shoulder between the head and the threaded section. The shoulder acts as a bearing surface or shaft, making them ideal for applications requiring rotation, sliding, or precise positioning. They have an internal hex drive in the head for wrench tightening.
| 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
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