S-94128A163 1/4"-20 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
- High-strength alloy steel construction ensures superior durability and resistance to wear in demanding industrial environments.
- Precise Class 3A thread fit guarantees reliable, vibration-resistant fastening with minimal risk of loosening over time.
- Exact 5/16" shoulder diameter with tight tolerances provides consistent alignment and smooth rotation for pivots, gears, and linkages.
- Headless slotted drive design allows for flush mounting and easy installation in confined spaces without protruding hardware.
- Rockwell C32 hardness rating delivers excellent mechanical strength and long-term performance under heavy loads.
- Coarse UNC thread pattern enables quick assembly and disassembly, reducing labor time in high-volume production.
- Full compliance with RoHS 3 and REACH regulations ensures environmental safety and meets global industry standards for hazardous substances.
Professional Applications & Engineering Value
This precision 1/4"-20 UNC shoulder screw is engineered to address critical alignment and stability challenges in mechanical assemblies. The alloy steel material, combined with a Rockwell C32 hardness, provides exceptional resistance to shear forces and fatigue, making it ideal for high-stress applications like rotating shafts, bearing mounts, and precision machinery linkages. The headless slotted design and coarse thread facilitate efficient installation in tight spaces, while the exact shoulder diameter and precise fit eliminate misalignment issues, reducing wear on components. Commonly used in automotive, aerospace, and industrial equipment, this screw ensures reliable performance where vibration resistance and dimensional accuracy are paramount.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC coarse thread with Class 3A thread fit for high precision, a shoulder diameter of 5/16" (tolerance: -0.001" to 0"), and a shoulder length of 1/2" (tolerance: 0" to 0.005"). It is manufactured from alloy steel with a hardness of Rockwell C32 and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring adherence to environmental and safety regulations.
