S-99154A401 4-40 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, ideal for harsh industrial environments
- Precise component alignment ensured by the 1/8" shoulder diameter with tight tolerance for reliable assembly
- High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Easy installation and space-saving design with low-profile socket head and slotted drive for versatile tool access
- Consistent thread engagement through Class 2A UNC coarse threads, reducing cross-threading risks
- Environmental compliance assurance meeting RoHS 3 and REACH standards for global supply chain integration
- Durable, smooth surface finish providing reduced friction and extended service life in moving parts
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The 18-8 stainless steel material offers excellent resistance to oxidation and chemical exposure, making it suitable for electronics, machinery, and automotive components where environmental factors are a concern. The 1/8" shoulder diameter with precise tolerances acts as a reliable locating feature, eliminating misalignment in rotating parts or bushings. Combined with a low-profile socket head and Class 2A thread fit, it ensures secure fastening without protrusion, reducing maintenance needs and enhancing operational reliability in compact designs.
Specification Summary & Compliance
This shoulder screw adheres to UNC coarse thread standards with a Class 2A thread fit for consistent assembly precision. Manufacturing specifications include a shoulder diameter tolerance of -0.001" to 0" and shoulder length tolerance of 0" to 0.002" to ensure exacting performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in regulated industries and international markets.
