S-97768A336 1/4"-20 ASME B18.3 Shoulder Screws
Shoulder Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with Black Oxide finish on 18-8 stainless steel, ideal for harsh industrial environments
- Precise alignment and reduced wear thanks to the knurled head and 3 1/2" shoulder length for stable component positioning
- High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications
- Reliable thread engagement with Class 3A UNC coarse threads ensuring secure fastening and easy assembly
- Easy installation and removal using the hex socket drive style, minimizing tool slippage and damage
- Long-term durability backed by Rockwell B55 hardness, resisting deformation under stress
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for quality and environmental safety
Professional Applications & Engineering Value
This shoulder screw is engineered to address common industrial challenges such as misalignment and component wear in machinery. The 18-8 stainless steel construction, combined with a Black Oxide finish, provides excellent resistance to corrosion and oxidation, extending service life in humid or chemically aggressive settings. The 3 1/2" shoulder length and precise shoulder diameter tolerance enable accurate pivoting and spacing in assemblies, reducing friction and maintenance needs. With UNC coarse threads and a hex socket head, it ensures quick, secure fastening in high-vibration environments like automotive, aerospace, and manufacturing equipment, delivering consistent performance and reducing downtime.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit for tight tolerances and reliable threading. The shoulder diameter is 5/16" with a tolerance of -0.004" to -0.002", and the shoulder length is 3 1/2" with a tolerance of -0.005" to 0.005", ensuring precision in assembly. It complies with ASME B18.3 specifications for dimensional accuracy and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety regulations for industrial use.
