S-97768A359 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 18-8 stainless steel and black oxide finish, ideal for harsh industrial environments
- Exceptional mechanical strength with 70,000 psi tensile and 35,000 psi shear strength for reliable load-bearing applications
- Precise Class 3A thread fit ensures tight tolerances and secure fastening in demanding assemblies
- Knurled head with hex socket drive provides enhanced grip and easy installation using standard 3/16" tools
- Accurate shoulder dimensions (3/8" diameter, 5/8" length) maintain consistent alignment in machinery and fixtures
- Compliance with ASME B18.3 standards guarantees consistent quality and interchangeability in professional use
- RoHS 3 and REACH compliant for environmentally responsible and safe usage in regulated industries
Professional Applications & Engineering Value
This black oxide 18-8 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The UNC coarse thread with Class 3A fit ensures rapid assembly and vibration resistance, while the 3/8" shoulder diameter and 5/8" shoulder length provide stable bearing surfaces for rotating parts or spacers. The knurled socket head enhances torque transmission and prevents tool slippage during installation. Ideal for applications requiring high tensile strength and corrosion protection, such as conveyor systems, motor mounts, and assembly jigs, this screw minimizes downtime and maintenance costs in industrial settings.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC thread with Class 3A precision fit, ensuring tight dimensional accuracy. The shoulder maintains a diameter of 3/8" with a tolerance of -0.004" to -0.002" and a length of 5/8" with a tolerance of -0.005" to 0.005". Manufactured in compliance with ASME B18.3 specifications, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial and commercial use.
