S-92949A861 5/16"-24 x 1 3/8" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws
Stainless Steel Button Head Hex-Drive 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 passivated finish, ideal for harsh industrial environments
- Exceptional thread precision with Class 3A fit and UNF fine threading ensures secure, vibration-resistant fastening
- High mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Easy installation and removal with hex drive design providing reliable torque transmission
- Full threading coverage along the 1 3/8" length maximizes grip and load distribution
- Compliant with major industry standards including ASME B18.3, RoHS 3, and REACH for guaranteed quality and safety
- Rounded button head profile reduces surface damage and provides a finished appearance
Professional Applications & Engineering Value
Engineered for high-performance industrial applications, these 18-8 stainless steel rounded head screws address critical challenges in machinery assembly, automotive components, and electronic enclosures. The Class 3A thread fit combined with UNF fine threading prevents loosening under vibration, while the passivated finish significantly enhances corrosion resistance in humid or chemical-exposed environments. With 70,000 psi tensile strength and hex drive compatibility, they provide reliable fastening in tight spaces where torque control and durability are paramount. These screws are particularly valuable in precision equipment manufacturing, where thread accuracy and material integrity directly impact operational safety and longevity.
Specification Summary & Compliance
This 5/16"-24 UNF screw features Class 3A thread fit per UNF standards, ensuring precise dimensional accuracy. Manufactured in accordance with ASME B18.3 specifications (ASTM F879), it guarantees consistent performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to environmental and safety standards. Additional specifications include a fully threaded 1 3/8" length, Rockwell B55 hardness, and right-hand thread direction for universal compatibility in inch-system applications.
