S-97768A306 1/4"-28 ASME B18.3 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
- Superior corrosion resistance with 18-8 stainless steel construction and black oxide finish, ideal for harsh industrial environments
- Precise component positioning enabled by the 5/16" shoulder length with tight diameter tolerance for accurate alignment
- High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
- Secure fastening in fine-thread applications through 1/4"-28 UNF Class 3A threads ensuring vibration resistance
- Easy installation and removal with hex socket drive and knurled head for improved grip during tool engagement
- Extended service life thanks to Rockwell B55 hardness providing excellent wear resistance
- Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
These black oxide shoulder screws deliver critical engineering solutions where precise alignment and durability are paramount. The 18-8 stainless steel construction combined with black oxide finish provides exceptional corrosion resistance in manufacturing equipment, automotive assemblies, and precision machinery. The 5/16" shoulder length with controlled diameter tolerance ensures accurate component positioning in rotating mechanisms and bearing mounts. Class 3A UNF fine threads maintain secure fastening in high-vibration environments, while the hex socket drive enables efficient installation in confined spaces. These shoulder screws solve common industrial challenges of misalignment, corrosion-induced failure, and thread stripping in critical assemblies.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit for superior engagement and shoulder diameter tolerance of -0.004" to -0.002" ensuring precise component alignment. Thread specifications include 1/4"-28 UNF fine threads with 5/16" thread length. Full compliance with ASME B18.3 manufacturing specifications, RoHS 3 (2015/863/EU) for hazardous substance restriction, and REACH (EC 1907/2006) regulations for chemical safety in industrial applications.
