S-91251A091 3-48 x 3/16" 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 industrial applications, reducing the risk of fastener failure.
- Black-oxide coating on alloy steel provides enhanced corrosion resistance, extending service life in demanding environments.
- Class 3A thread fit with UNC coarse threads offers precise, secure fastening with excellent vibration resistance and easy assembly.
- Hex socket drive (5/64") allows for high-torque installation in confined spaces, improving installation efficiency.
- Rockwell C37 hardness delivers superior wear resistance and durability, minimizing deformation under heavy loads.
- Full compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency and environmental safety for global supply chains.
- Fully threaded design ensures uniform load distribution and versatile use across various joint types.
Professional Applications & Engineering Value
Engineered for precision and endurance, these 3-48 UNC socket head cap screws in black-oxide alloy steel address critical challenges in industrial assembly, such as vibration loosening and corrosion-induced degradation. The coarse thread design facilitates quick installation in materials like cast iron or soft metals, while the hex drive enables secure tightening in tight spaces common in machinery, automotive, and aerospace components. With a 170,000 psi tensile strength and Rockwell C37 hardness, they withstand extreme mechanical stresses, reducing maintenance needs and downtime. Ideal for high-strength fastening in equipment requiring reliable, long-term performance, these screws ensure operational safety and efficiency in harsh conditions.
Specification Summary & Compliance
This product adheres to Class 3A thread fit for precise UNC coarse threading, with dimensions including a 3/16" length and 5/64" hex drive. Manufactured in accordance with ASTM A574 specifications, it meets stringent quality standards for alloy steel socket head cap screws. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) ensures environmental safety and regulatory acceptance in international markets.
