S-91259A166 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 tensile strength of 140,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black oxide finish extends service life in demanding industrial environments.
- Precise shoulder alignment with a 3/16" shoulder diameter and tight tolerances provides accurate component positioning and reduced assembly time.
- High shear strength of 84,000 psi offers dependable load-bearing capacity for dynamic or vibrating machinery.
- Class 3A thread fit guarantees secure, vibration-resistant fastening with minimal backlash in UNC coarse threads.
- Hex socket drive design allows for easy installation and removal in confined spaces, improving maintenance efficiency.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency and environmental safety for global supply chains.
Professional Applications & Engineering Value
These alloy steel shoulder screws are engineered to address critical challenges in precision assembly and heavy-duty operations. The black oxide finish provides a durable barrier against rust and wear, ideal for automotive, aerospace, and machinery sectors where exposure to moisture and chemicals is common. With a Rockwell C32 hardness and UNC coarse threads, they resist stripping and maintain integrity under repetitive loads. The 3/16" shoulder length and precise tolerances enable exact alignment in pivots, bearings, and linkages, reducing misalignment issues and enhancing operational reliability. This combination of high tensile and shear strength makes them suitable for applications demanding robust fastening without compromising on precision or longevity.
Specification Summary & Compliance
This product adheres to Class 3A thread fit for precise UNC threading, with shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005" to ensure consistent performance. Manufactured in compliance with ASTM A574 specifications for alloy steel socket head cap screws, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, confirming environmental and safety regulations are satisfied for industrial use.
