S-91864A029 4-40 x 1 1/8" 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
- Superior corrosion resistance provided by black-oxide coating extends service life in demanding environments
- Precision Class 3A thread fit delivers secure, vibration-resistant fastening with minimal backlash
- Optimized drive system with 3/32" hex socket enables efficient installation and high torque transmission
- Partially threaded design allows for precise clamping force control and simplified assembly
- Enhanced durability from Rockwell C37 hardness maintains structural integrity under repeated loads
- Regulatory compliance with RoHS 3 and REACH ensures environmental responsibility and global market acceptance
Professional Applications & Engineering Value
These 4-40 UNC socket head cap screws deliver critical engineering advantages for industrial applications where reliability and precision are paramount. The black-oxide alloy steel construction provides superior corrosion protection in harsh operating environments, while the coarse thread design ensures rapid assembly and reduced cross-threading risks. The combination of 170,000 psi tensile strength and Rockwell C37 hardness makes these fasteners ideal for machinery, automotive components, and precision equipment requiring vibration resistance and long-term structural integrity. The partially threaded configuration allows engineers to precisely control clamping forces while the hex socket drive facilitates installation in confined spaces common in industrial assemblies.
Specification Summary & Compliance
Manufactured to ASTM A574 specifications with Class 3A thread fit for superior dimensional accuracy. Features 4-40 UNC coarse threads in right-hand orientation with 3/4" minimum thread length. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Inch system measurements include 1-1/8" overall length and 0.183" head diameter with standard socket head profile.
