S-97345A538 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, ideal for harsh industrial and marine environments.
- 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 tight, secure fastening with minimal backlash in critical assemblies.
- Easy installation and removal with a 5/32" hex socket drive and knurled head for improved grip and torque application.
- Durable and wear-resistant thanks to Rockwell B79 hardness, maintaining integrity over repeated use.
- Broad compliance with ASME B18.3 standards, RoHS 3, and REACH for use in regulated and international markets.
- Versatile shoulder design with a 5/16" diameter and 13/16" length for accurate component alignment and spacing.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address common challenges in precision machinery, such as misalignment and corrosion-induced failure. Its 1/4"-20 UNC coarse thread with Class 3A fit provides secure, vibration-resistant fastening in dynamic applications like robotics, conveyor systems, and automotive jigs. The knurled head and hex socket drive facilitate quick assembly in tight spaces, while the corrosion-resistant material ensures longevity in humid or chemical-exposed settings. By combining high tensile strength and precise shoulder dimensions, it supports accurate pivoting and bearing functions, reducing maintenance needs in industrial equipment.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for tight tolerances and a coarse UNC thread for rapid assembly. The shoulder diameter (5/16") and length (13/16") maintain precise tolerances, ensuring consistent performance. It is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety standards for global industrial use.
