Shoulder Bolt
Shoulder Bolt - Image 2
Shoulder Bolt - Image 3
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Shoulder Bolt

  • Socket Shoulder Bolts
  • Slotted Shoulder Bolts
  • Hex Head Shoulder Bolts

Category

Shoulder bolts, also known as shoulder screws or stripper bolts, are machine screws with an integral, unthreaded cylindrical shoulder between the head and the threaded section. This precision-ground shoulder acts as a shaft, pivot point, or dowel for rotating or sliding components such as pulleys, gears, bearings, and bushings.

Available Types

Head Style Description Drive Type
Socket Shoulder Bolt Most common type; features a hex socket drive for high torque applications Hex Socket
Slotted Shoulder Bolt Traditional slotted head for flathead screwdriver installation Slotted
Hex Head Shoulder Bolt External hex head for wrench installation; offers very shallow head height Wrench

Applicable Standards

  • ASME B18.3 (Socket Cap, Shoulder, Set Screws, and Hex Keys Inch Series)
  • ISO 7379 (Hexagon socket head shoulder screws)
Materials
Material Properties Common Applications
Alloy Steel High strength, heat-treated; typical for commercial-grade screws General industrial, heavy machinery
Stainless Steel 303, 304, 316 grades; excellent corrosion resistance Marine, food processing, medical

Surface Finishes

  • Black Oxide – standard for alloy steel; provides mild corrosion resistance

  • Zinc Plating – clear, yellow, or blue finishes available

  • Plain/Natural – as-manufactured without coating

  • Passivation – for stainless steel grades

Common Applications

  • Machinery: Pivot points, guide rails, linear slides

  • Automotive: Engine components, transmission assemblies, suspension linkages

  • Aerospace: Precision assemblies where vibration resistance is critical

  • Tooling: Die sets, mold alignment, stripper plates

  • Industrial Equipment: Pulleys, gears, cam followers, bearing mounts

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