S-8077A791 1/4"-20 ASME B18.3 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 316 stainless steel construction and black oxide finish, ideal for harsh environments and extended service life
- Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high stress
- Precise Class 3A thread fit ensures accurate alignment and secure fastening in demanding assemblies
- Convenient installation and removal with a 5/32" hex socket drive and knurled head for enhanced grip
- Stable shoulder design with a 1" shoulder length providing consistent spacing and rotational support for moving parts
- Compliance with industry standards including ASME B18.3, RoHS, and REACH for guaranteed quality and safety
- Durable material hardness at Rockwell B79 resists wear and maintains integrity in repetitive motion applications
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and industrial equipment. The 1/4"-20 UNC coarse thread with Class 3A fit provides secure, vibration-resistant connections, while the 1" shoulder length acts as a reliable axle or pivot point for rotating components like gears and bearings. The black oxide finish on the corrosion-resistant 316 stainless steel enhances durability in moist or chemical-exposed environments, reducing maintenance needs. Combined with a knurled socket head for easy tool engagement, this fastener ensures efficient assembly and long-term reliability in high-tensile applications such as robotics, conveyors, and fixture design.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit for precise tolerance, a shoulder diameter of 5/16" with tolerance of -0.004" to -0.002", and shoulder length of 1" with tolerance of -0.005" to 0.005". It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safety and consistency for industrial use.
