S-97832A325 1/4"-28 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 construction, ideal for harsh environments and long-term reliability.
- High-strength performance offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications.
- Precision thread engagement with Class 3A UNF fine thread ensuring secure, vibration-resistant fastening.
- Easy installation and removal via the hex socket drive and knurled head texture for improved grip and torque application.
- Accurate component alignment with a precisely machined 5/16" diameter shoulder and controlled tolerances.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for guaranteed quality and safety.
- Durable and wear-resistant with Rockwell B55 hardness, maintaining integrity under repeated use.
Professional Applications & Engineering Value
This socket head shoulder screw is engineered to address critical alignment and fastening challenges in industrial settings. The 18-8 Stainless Steel material provides excellent corrosion resistance, making it suitable for machinery, automotive assemblies, and electronic enclosures exposed to moisture or chemicals. The 1/4"-28 UNF fine thread and Class 3A fit ensure tight, reliable connections that resist loosening under vibration, while the 5/16" shoulder length offers precise positioning for rotating parts like bearings and pulleys. The hex drive and knurled head facilitate quick assembly in confined spaces, reducing installation time and improving workflow efficiency in high-tensile strength applications.
Specification Summary & Compliance
This shoulder screw features a 1/4"-28 UNF fine thread with Class 3A precision tolerance for optimal fit. The shoulder diameter is 5/16" with a tolerance of -0.004" to -0.002", and the shoulder length is 1" with a tolerance of -0.005" to 0.005", ensuring consistent performance. Manufactured in compliance with ASME B18.3 specifications, it is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety standards for industrial use.
