S-91381A588 5/16"-18 x 1 1/4" ASME B18.3 Set Screws
Set Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with black-oxide coating on alloy steel, extending service life in harsh industrial environments.
- Precise Class 3A thread fit ensures tight, secure fastening with minimal backlash for reliable assembly integrity.
- Non-marring brass soft tip protects sensitive surfaces from damage during clamping, ideal for precision machinery.
- High strength and durability from Rockwell C28 hardness, providing excellent resistance to wear and deformation.
- Easy installation and removal with 5/32" hex drive, allowing efficient maintenance in confined spaces.
- Optimized for heavy-duty use with coarse UNC threads and 1-1/4" length, delivering strong holding power in dynamic loads.
- Compliance with industry standards including ASME B18.3, ensuring consistent quality and safety in applications.
Professional Applications & Engineering Value
This 5/16"-18 UNC set screw in black-oxide alloy steel is engineered to address common industrial challenges such as component slippage and surface damage. The Class 3A thread fit and coarse UNC thread spacing provide a secure, vibration-resistant lock for shafts, collars, and gears in machinery, preventing misalignment and ensuring operational stability. The brass soft tip eliminates marring on finished surfaces, making it ideal for precision equipment and automotive assemblies. With its headless design and hex drive, it offers space-saving installation in tight configurations, while the Rockwell C28 hardness guarantees long-term performance under stress, reducing maintenance needs and downtime in manufacturing and engineering sectors.
Specification Summary & Compliance
This set screw features a 5/16"-18 UNC thread with Class 3A precision fit and coarse spacing for reliable fastening. It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity in industrial use.
