Stainless Steel 304 Shoulder Screws Phillips Socket Head Precision Ground Metric M3 M4 M5 Class 4.8 For Bearing Shaft
Shoulder screws also known as shoulder bolts are precision fasteners with three distinct parts. The head the smooth ground shoulder and the threaded end. The shoulder acts as a rotating shaft or precision spacer while the thread provides secure mounting.
How They Work
The shoulder is ground to a precise diameter with tight tolerance. This smooth surface allows bearings bushings gears and pulleys to rotate freely. The threaded end screws into a tapped hole or nut to hold the assembly in place.
Head Styles
Materials
Stainless steel 304 offers good corrosion resistance for general industrial use. Stainless steel 316 provides excellent corrosion resistance for marine and chemical environments.
Alloy steel Class 12.9 offers high strength for heavy duty applications. Carbon steel Class 4.8 6.8 8.8 provides cost effective strength for general use.
Shoulder Specifications
- Shoulder diameter from 2mm to 25mm custom.
- Shoulder length from 2mm to 150mm.
- Shoulder tolerance as tight as h6 or h7.
- Surface finish ground to Ra 0.8 or better.
Thread Types
Metric threads M3 M4 M5 M6 M8 M10 M12. Standard coarse thread pitch. Fine thread available for vibration resistant applications. Custom thread lengths available.
Special Types
- Reverse shoulder screws have left hand thread. Good for applications where rotation would loosen standard threads.
- Countersunk shoulder screws have a flat head that sits flush. Good for surface mount applications.
- Self tapping shoulder screws cut their own thread in plastic. Good for plastic housing and enclosure assembly.
Where To Use Them
Jigs and fixtures. Mold guide pins and bushings. Bearing shafts and pivot pins. Conveyor rollers and sprockets. Cam followers and linkage assemblies. Printing press and packaging machinery. Medical devices and laboratory equipment. Food processing machinery.
Quality
Precision ground shoulder with tight diameter tolerance. 100 percent thread gauging and dimensional inspection. Class 4.8 6.8 8.8 12.9 options. Custom shoulder length and diameter per drawing. OEM orders welcome. Bulk pricing. Direct shipping.
- Precision ground shoulder acts as shaft or spacer
- Tight diameter tolerance for smooth bearing rotation
- Socket head hex head flat head headless styles
- Stainless steel alloy steel carbon steel options
- Metric M3 to M12 Class 4.8 6.8 8.8 12.9
- Custom shoulder length and diameter available
| Product Details | |
|---|---|
| General | Screw Type: Shoulder Screw / Shoulder Bolt Head Style: Socket Head / Hex Head / Flat Head / Headless Drive Type: Hex Socket / Hex Wrench |
| Material | Stainless Steel: 304 316 Alloy Steel: Class 12.9 Carbon Steel: Class 4.8 6.8 8.8 |
| Dimensions | Shoulder Diameter: 2mm to 25mm Custom Shoulder Length: 2mm to 150mm Thread Size: M3 to M12 |
| Finish | Surface: Precision Ground Tolerance: h6 or h7 Ra: 0.8 or better |
| Application | Jigs and Fixtures, Mold Guide Pins, Bearing Shafts, Conveyor Rollers |