S-94361A391 5/8"-18 Shoulder Screws
Shoulder 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
- Enhanced alignment precision with Class 3A thread fit for secure, vibration-resistant connections in critical assemblies
- Superior load-bearing capacity from alloy steel construction, offering 140,000 psi tensile strength for demanding industrial applications
- Exceptional corrosion resistance through black oxide finish, extending service life in harsh environments
- Secure installation and removal with knurled socket head and 3/8" hex drive, preventing tool slippage during high-torque operations
- Accurate component positioning due to precisely machined shoulder (3/4" diameter, 1-1/4" length) with tight tolerances for minimal play
- Reliable fine-thread engagement with 5/8"-18 UNF threads, ensuring better tension control in thin materials
- Industry compliance assurance meeting RoHS 3 and REACH regulations for safe use in regulated sectors
Professional Applications & Engineering Value
This alloy steel shoulder screw delivers critical engineering solutions where precise alignment and high strength are paramount. The Class 3A thread fit eliminates backlash in rotating assemblies, while the black oxide finish protects against rust in humid or chemical-exposed environments. Its knurled socket head provides positive grip for maintenance personnel, reducing installation errors in confined spaces. The precision shoulder acts as a dowel for locating gears, bearings, and linkages in machinery, automotive, and automation systems—preventing lateral movement under cyclic loads. With 140,000 psi tensile strength and Rockwell C32 hardness, it withstands shock loads in presses, conveyors, and robotic arms without deformation.
Specification Summary & Compliance
Manufactured to UNF fine thread standards (5/8"-18) with Class 3A fit for superior thread engagement. Shoulder diameter tolerance maintained at -0.004" to -0.002" and length tolerance at ±0.005" for exacting assembly requirements. Compliant with RoHS 3 (2015/863/EU) under exemption 6(a) and REACH (EC 1907/2006) regulations. Material certifications confirm alloy steel composition with specified hardness (Rockwell C32) and tensile strength (140,000 psi).
