S-91864A020 4-48 x 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 tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
- Precise Class 3A thread fit provides excellent engagement and vibration resistance in critical assemblies, minimizing loosening over time.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish for harsh environments.
- Fine UNF thread design allows for finer adjustments and stronger holding power in thin materials or precision applications.
- Fully threaded shank ensures consistent clamping force along the entire length, ideal for adjustable or deep-set installations.
- Hex socket drive (3/32") enables high-torque installation with standard tools, reducing stripping and improving assembly efficiency.
- Rockwell C37 hardness balances toughness and machinability, providing long-term wear resistance without brittleness.
Professional Applications & Engineering Value
This 4-48 UNF thread socket head cap screw is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in demanding environments. The black-oxide alloy steel construction, combined with a fine thread and Class 3A fit, ensures secure fastening in precision equipment, automotive assemblies, and machinery where tight tolerances are critical. Its fully threaded design allows for versatile mounting in confined spaces, while the high tensile strength and hardness (Rockwell C37) prevent deformation under load. Ideal for industrial fasteners in OEM and MRO applications, it reduces maintenance needs and enhances operational reliability by meeting rigorous performance standards.
Specification Summary & Compliance
This socket head cap screw features a 4-48 UNF fine thread with Class 3A thread fit for high precision, and dimensions include a 1/4" length, 3/32" hex drive, and standard socket head profile. It complies with ASTM A574 specifications for alloy steel socket head cap screws, and is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental and safety standards are met for global industrial use.
