S-91829A302 1/4"-20 MS51575-28, NASM51575 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 and passivated finish, ideal for harsh industrial environments
- Precise alignment and secure component positioning thanks to consistent 5/16" shoulder diameter with tight tolerance of -0.001" to 0"
- High mechanical strength and durability with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Reliable thread engagement with Class 2A fit and coarse UNC thread spacing, ensuring easy assembly and vibration resistance
- Wide regulatory compliance meeting MS51575-28, RoHS 3, and REACH standards for global industrial use
- Optimized for socket drive providing secure tool engagement and reduced risk of stripping during installation
- Right-hand thread design compatible with standard assembly processes for efficient production workflows
Professional Applications & Engineering Value
This precision shoulder screw delivers exceptional value in applications requiring exact component spacing and rotational control. The 18-8 stainless steel construction combined with passivated finish provides excellent corrosion resistance, making it suitable for machinery, automotive, and electronic assemblies exposed to moisture or chemicals. The precise shoulder diameter maintains consistent alignment in bushings, bearings, and linkages, reducing wear and preventing misalignment issues. With Class 2A thread fit and coarse UNC threading, installation is streamlined while maintaining secure fastening under vibration. The socket head design allows for compact assembly in confined spaces, making these shoulder screws ideal for precision instruments, manufacturing jigs, and robotic components where reliability and repeatability are critical.
Specification Summary & Compliance
This shoulder screw maintains Class 2A thread fit per UNC standards with precise shoulder diameter tolerance of -0.001" to 0" and shoulder length tolerance of 0" to 0.002". Manufacturing complies with MS51575-28 specification and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial applications.
