S-91381A639 3/8"-16 x 1 1/2" ASME B18.3 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
- Superior corrosion resistance with black-oxide finish, extending service life in harsh industrial environments.
- Precise Class 3A thread fit ensures tight, secure fastening with minimal backlash for reliable assembly.
- Non-marring brass soft tip protects sensitive surfaces from damage during clamping or positioning.
- High-strength alloy steel construction with Rockwell C28 hardness provides excellent durability under heavy loads.
- Coarse UNC threading allows for quick installation and removal, reducing assembly time.
- Headless hex drive design enables flush mounting in confined spaces while offering high torque capability.
- Compliance with ASME B18.3 and environmental regulations guarantees quality and safe use in global markets.
Professional Applications & Engineering Value
This black-oxide alloy steel set screw is engineered to address critical challenges in industrial fastening, such as vibration-induced loosening and surface damage. The UNC coarse thread with Class 3A fit delivers superior holding power in dynamic applications, from machinery shafts to precision equipment. Its brass soft tip prevents galling on costly components, making it ideal for securing gears, pulleys, and collars without compromising finish integrity. The headless hex drive design allows seamless integration in tight spaces, while the Rockwell C28 hardness ensures long-term reliability under repetitive stress. Widely used in automotive, aerospace, and manufacturing sectors, this fastener combines robust material properties with thoughtful engineering to enhance assembly efficiency and product lifespan.
Specification Summary & Compliance
This set screw adheres to ASME B18.3 specifications, featuring precise UNC 3/8"-16 coarse threads with Class 3A tolerance for optimal fit. The black-oxide surface treatment on alloy steel enhances corrosion protection, and the product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and global market acceptance.
