S-91327A161 5/16"-18 ASME B18.3 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
- Vibration-resistant locking with permanent nylon patch for secure fastening in demanding environments from -50° to 250° F
- Exceptional corrosion resistance from 18-8 stainless steel construction, ideal for harsh industrial settings
- Precision alignment and bearing surface with 3/8" shoulder diameter maintained to tight -0.004" to -0.002" tolerance
- High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
- Reliable coarse threading with UNC 5/16"-18 Class 3A fit ensuring quick assembly and superior thread engagement
- Enhanced installation control through hex socket drive and knurled head design for slip-resistant torque application
- Industry compliance assurance meeting ASME B18.3 standards and environmental regulations including RoHS 3 and REACH
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw addresses critical engineering challenges in precision machinery and industrial equipment. The 3/8" shoulder diameter with controlled tolerances provides exact positioning for rotating components, eliminating misalignment issues in assemblies. The integrated nylon patch thread locking technology prevents loosening under vibration, a common failure point in automotive, aerospace, and manufacturing equipment. The UNC coarse threads with Class 3A fit enable rapid installation while maintaining structural integrity, while the hex socket drive and knurled head ensure secure tool engagement during high-torque applications. Manufactured from corrosion-resistant 18-8 stainless steel, this shoulder screw maintains performance in challenging environments where moisture and chemicals are present.
Specification Summary & Compliance
This precision shoulder screw features 5/16"-18 UNC coarse threads with Class 3A thread fit for superior engagement. The shoulder maintains 3/8" diameter with tolerance of -0.004" to -0.002" and 1" length with -0.005" to 0.005" tolerance. Manufacturing complies with ASME B18.3 specifications, with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.
