S-97768A294 1/4"-20 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
- Superior corrosion resistance with 18-8 Stainless Steel construction and Black Oxide finish, ideal for harsh industrial environments.
- High-strength performance offering 70,000 psi tensile strength and 35,000 psi shear strength for reliable load-bearing applications.
- Precise thread engagement with Class 3A UNC coarse threads ensuring secure, vibration-resistant fastening in machinery.
- Easy installation and removal via 5/32" hex socket drive and knurled head for improved grip and torque application.
- Durable shoulder design with controlled diameter and length tolerances for accurate component alignment and spacing.
- Consistent hardness at Rockwell B55 to resist wear and deformation under repeated use.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for safe, regulated use in global markets.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical alignment and durability challenges in industrial assemblies. The 18-8 Stainless Steel material, combined with a Black Oxide finish, provides excellent resistance to corrosion and oxidation, extending service life in humid or chemically exposed settings. The 1/4"-20 UNC coarse threads and Class 3A thread fit ensure rapid assembly and high clamping force, reducing the risk of loosening in vibrating equipment like motors, conveyors, and automation systems. The hex socket drive and knurled head facilitate easy installation in confined spaces, while the precisely machined shoulder maintains component positioning in pivots, bearings, and linkages. Ideal for OEM and MRO applications, this screw delivers reliable performance where precision and strength are paramount.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for tight tolerances and consistent performance. Key dimensions include a 1/4"-20 UNC thread with 7/16" length, 5/16" shoulder diameter, and 1/4" shoulder length, all manufactured to precise industrial standards. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety requirements for use in various sectors.
