S-97345A617 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 316 stainless steel construction, ideal for harsh chemical and marine environments.
- Precise component alignment ensured by the 2 1/2" shoulder with tight tolerances for reliable assembly.
- High-strength performance with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications.
- Secure, fine-thread engagement provided by the 1/4"-28 UNF Class 3A thread fit, reducing the risk of loosening under vibration.
- Easy installation and removal with a knurled, hex socket head for improved grip and tool engagement.
- Compliance with major standards including ASME B18.3, ensuring interchangeability and reliability in industrial use.
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance for global market acceptance.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to solve critical alignment and corrosion challenges in precision assemblies. The 2 1/2" shoulder length with controlled tolerances provides a stable pivot or bearing surface, eliminating misalignment in machinery, robotics, and conveyor systems. The fine UNF thread (1/4"-28) with a Class 3A fit offers superior resistance to vibrational loosening compared to coarse threads, making it ideal for dynamic loads. The knurled socket head enhances grip in oily conditions, while the hex drive allows for high-torque installation. Its exceptional corrosion resistance ensures long-term reliability in chemical processing, marine, and food-grade applications, reducing maintenance downtime and replacement costs.
Specification Summary & Compliance
This shoulder screw features a 1/4"-28 UNF fine thread with Class 3A fit for high precision. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 2 1/2" with a tolerance of -0.005" to 0.005". Material hardness is Rockwell B79 with a tensile strength of 70,000 psi. It conforms to ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations.
