S-91375A746 1/2"-20 x 3 1/2" ASME B18.3, ASTM F912 Set Screws
Set 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 holding power with a cup point tip that bites into surfaces for secure, permanent positioning in assemblies.
- Superior corrosion resistance provided by the black-oxide finish on alloy steel, extending the screw's service life in various industrial environments.
- High-strength durability from Rockwell C45 hardness, ensuring the fastener withstands high stress and resists wear.
- Precise and reliable fastening due to the UNF fine thread and Class 3A fit, minimizing the risk of loosening under vibration.
- Easy installation and removal with a 1/4" hex drive in a headless design, allowing for flush mounting and access in tight spaces.
- Guaranteed compliance and safety by meeting ASME B18.3, RoHS 3, and REACH standards, ensuring material quality and environmental responsibility.
Professional Applications & Engineering Value
This black-oxide alloy steel set screw is engineered to address critical challenges in industrial applications where vibration resistance and permanent alignment are paramount. The UNF fine thread with a Class 3A fit provides tighter tolerances, reducing backlash and maintaining clamp load in dynamic systems like heavy machinery, automotive components, and precision manufacturing equipment. The cup point tip concentrates pressure for a strong bite, preventing slippage on shafts and collars. Combined with Rockwell C45 hardness, it offers excellent fatigue strength, making it ideal for high-stress environments. Its headless design with a hex drive ensures a clean profile and easy serviceability, solving space constraints while delivering reliable, long-term performance.
Specification Summary & Compliance
This set screw features a 1/2"-20 UNF fine thread with a Class 3A thread fit for high precision and a length of 3 1/2". It is manufactured from alloy steel with a black-oxide surface treatment and meets ASME B18.3 specifications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for industrial use.
