S-94128A161 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
- Exceptional Thread Precision – Class 3A thread fit ensures tight, reliable fastening with minimal backlash in high-vibration environments.
- Superior Material Strength – Alloy steel construction with Rockwell C32 hardness provides excellent wear resistance and long-term durability.
- Accurate Shoulder Alignment – Precise shoulder diameter (5/16") and length (1/4") with tight tolerances enable exact component positioning.
- Easy Installation & Removal – Slotted drive design allows straightforward manual assembly and disassembly using standard tools.
- Robust Coarse Thread Design – 1/4"-20 UNC right-hand threads offer quick engagement and high resistance to stripping.
- Headless, Space-Saving Profile – Headless design maximizes usable space in compact assemblies while maintaining full shoulder functionality.
- Environmental & Regulatory Compliance – Meets RoHS 3 and REACH standards, ensuring safe use in regulated industries.
Professional Applications & Engineering Value
This precision shoulder screw is engineered to address critical alignment and durability challenges in industrial machinery. The alloy steel construction, combined with Rockwell C32 hardness, ensures the screw withstands repetitive loads and harsh operating conditions without deforming. The Class 3A thread fit and precise shoulder dimensions (5/16" diameter, 1/4" length) provide exact locating and pivoting functions in assemblies such as rotating shafts, gears, and linkages. The headless design with slotted drive simplifies maintenance in tight spaces, while the coarse UNC threads enable rapid installation in production environments. Ideal for precision mechanical fastening in automation, automotive, and aerospace applications where dimensional accuracy and reliability are paramount.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC coarse thread with Class 3A thread fit for high precision. Shoulder diameter is 5/16" with tolerance of -0.001" to 0", and shoulder length is 1/4" with tolerance of 0" to 0.005" for precise fit. Manufactured from alloy steel with Rockwell C32 hardness. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations.
