S-91264A542 1/4"-20 ASME B18.3, ASTM A574 Shoulder Screws
Shoulder Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Permanent vibration resistance with nylon pellet thread locker that maintains integrity across -50° to 250°F temperature ranges
- Superior corrosion protection through black oxide finish, extending service life in demanding industrial environments
- Exceptional load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for heavy-duty applications
- Precision alignment and smooth rotation enabled by 1" shoulder length with controlled diameter tolerance for consistent bearing surfaces
- Reliable thread engagement through Class 3A thread fit UNC coarse threads ensuring secure fastening in high-vibration settings
- Enhanced grip and tool engagement with knurled socket head and 5/32" hex drive for secure installation and removal
- Industry compliance assurance meeting ASME B18.3 manufacturing standards and environmental regulations (RoHS 3, REACH)
Professional Applications & Engineering Value
This alloy steel shoulder screw delivers critical engineering solutions where precision alignment and vibration resistance are paramount. The 1" shoulder length with controlled diameter tolerance provides exact positioning for rotating components in machinery, while the Class 3A UNC coarse threads ensure rapid assembly and disassembly in maintenance operations. The permanent nylon pellet locking mechanism eliminates the need for secondary locking devices in high-vibration environments such as automotive assemblies, industrial machinery, and precision equipment. Combined with the black oxide finish, this fastener maintains performance in corrosive conditions, making it ideal for manufacturing equipment, robotics, and aerospace applications where reliability cannot be compromised.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit precision, this shoulder screw features 1/4"-20 UNC coarse threads with 7/16" thread length and 1" shoulder length (tolerance: -0.005" to 0.005"). The alloy steel construction achieves Rockwell C32 hardness with 140,000 psi tensile strength and 84,000 psi minimum shear strength. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards ensures safe use across global markets.
