S-91251A042 3/4"-16 x 1 1/2" 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
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing failure risks
- Precision Class 3A thread fit provides superior engagement and vibration resistance in demanding assemblies
- Black-oxide coating on alloy steel offers enhanced corrosion resistance for extended service life in harsh environments
- Fine UNRF threads deliver improved clamping force distribution and better load-bearing capacity
- Rockwell C37 hardness maintains structural integrity under heavy mechanical loads and repeated use
- 5/8" hex drive design allows for high-torque installation with standard tools, improving assembly efficiency
- Full threading along 1½" length enables versatile positioning and secure fastening across various material thicknesses
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw addresses critical engineering challenges in heavy machinery, automotive, and industrial equipment applications. The fine UNRF thread configuration combined with Class 3A precision tolerance eliminates backlash and maintains clamping force in high-vibration environments where standard fasteners typically loosen. The alloy steel construction with 170,000 psi tensile strength provides exceptional resistance to shock loading and fatigue, making it ideal for structural connections, hydraulic systems, and precision assemblies requiring reliable, long-term performance. The black-oxide surface treatment further enhances durability while the socket head design facilitates installation in confined spaces where wrench clearance is limited.
Specification Summary & Compliance
Manufactured to ASTM A574 specifications with Class 3A thread fit and UNRF fine thread profile (3/4"-16). Dimensions include 1½" length, 1⅛" head diameter, and ¾" head height with standard socket head profile. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Mechanical properties include Rockwell C37 hardness and 170,000 psi minimum tensile strength.
