S-91251A514 4-48 x 1 1/4" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket Head 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 black-oxide coating for extended service life in demanding environments
- Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions
- Precise Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies
- Fine UNF threading offers better adjustment control and superior holding power compared to coarse threads
- Partially threaded design allows for precise clamping force application without unnecessary thread engagement
- Compact socket head profile enables installation in confined spaces with standard 3/32" hex tools
- Rockwell C37 hardness maintains thread integrity and drive socket durability through repeated use
Professional Applications & Engineering Value
These 4-48 UNF socket head cap screws deliver exceptional engineering value in precision applications where space constraints and reliability are paramount. The black-oxide alloy steel construction provides superior corrosion protection while maintaining the high tensile strength required for critical assemblies. The fine thread configuration ensures secure fastening in materials prone to vibration loosening, making them ideal for aerospace components, precision instrumentation, and high-performance machinery. The combination of Class 3A thread fit and partially threaded design allows for precise axial positioning and consistent clamping force, eliminating the need for additional locking mechanisms in many applications.
Specification Summary & Compliance
Manufactured to exacting ASTM A574 specifications, these screws feature precision Class 3A thread fit with UNF fine threading (4-48) and right-hand thread direction. The partially threaded design provides 1" minimum thread length on a 1-1/4" overall length. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) ensures environmental responsibility and global regulatory acceptance for industrial applications.
