S-91259A167 8-32 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
- Exceptional strength-to-weight ratio with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in demanding applications
- Precision Class 3A thread fit ensures smooth assembly and secure fastening with minimal backlash in machinery and equipment
- Corrosion-resistant black oxide finish provides durable protection against rust and wear in industrial environments
- Accurate 3/16" shoulder diameter with tight tolerance control maintains precise alignment for rotating components and pivoting mechanisms
- Optimized 3/4" shoulder length offers consistent bearing surface for gears, pulleys, and linkages
- Hex socket drive design allows for high-torque installation in confined spaces without stripping
- Rockwell C32 hardness delivers excellent wear resistance and dimensional stability under repeated loading
Professional Applications & Engineering Value
These alloy steel shoulder screws with 8-32 UNC coarse threads and black oxide finish solve critical alignment and wear challenges in precision assemblies. The 3/16" shoulder diameter with controlled tolerances provides exact locating surfaces for bearings, gears, and rotating components, eliminating misalignment issues that cause premature failure. The 3/4" shoulder length creates a reliable pivot point in machinery linkages while the Class 3A thread fit ensures vibration-resistant fastening. Ideal for industrial automation equipment, precision instruments, and heavy-duty machinery, these screws maintain dimensional stability under the 140,000 psi tensile loads, preventing deformation in high-stress applications.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit per UNC specifications and precise shoulder diameter tolerance of -0.004" to -0.002". The 3/4" shoulder length maintains -0.005" to 0.005" tolerance for consistent performance. These shoulder screws comply with ASTM A574 specification for socket head cap screws and meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards for industrial use.
