S-91259A445 5/8"-11 ASME B18.3, ASTM A108 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
- Exceptional load-bearing capacity with 140,000 psi tensile strength for reliable performance in high-stress industrial applications
- Precision thread engagement with Class 3A fit ensures secure fastening and vibration resistance in machinery assemblies
- Enhanced corrosion protection through black oxide finish extends service life in demanding environments
- Superior wear resistance from Rockwell C32 hardness maintains dimensional stability under repeated use
- Secure grip and easy installation with knurled head texture and 3/8" hex drive for torque transmission
- Accurate component alignment through 3/4" shoulder diameter with tight tolerance control
- Regulatory compliance assurance with ASME B18.3 standards and RoHS/REACH environmental certifications
Professional Applications & Engineering Value
This high-strength shoulder screw delivers critical engineering solutions for industrial machinery and precision equipment. The alloy steel construction with black oxide finish provides superior corrosion resistance while maintaining dimensional accuracy in applications ranging from rotating assemblies to precision positioning systems. The 3/4" shoulder diameter with controlled tolerances ensures perfect alignment of components, eliminating misalignment issues that cause premature wear. The 5/8"-11 UNC coarse thread with Class 3A fit offers rapid assembly and reliable clamping force in high-vibration environments. Engineered for heavy-duty applications, this fastener solves common industrial challenges including component slippage, alignment inaccuracies, and corrosion-induced failure in manufacturing equipment, automation systems, and power transmission assemblies.
Specification Summary & Compliance
This precision shoulder screw features 5/8"-11 UNC coarse threads with Class 3A thread fit for superior engagement. Critical dimensions include 3/4" shoulder diameter with tolerance of -0.004" to -0.002" and 3/8" shoulder length with tolerance of -0.005" to 0.005". Manufactured to ASME B18.3 specifications using ASTM A108 material, the fastener is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety standards for industrial applications.
