S-97768A305 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 18-8 stainless steel construction and black oxide finish, ideal for harsh industrial environments.
- Enhanced load-bearing capacity thanks to a 70,000 psi tensile strength and 35,000 psi shear strength for reliable performance under stress.
- Precise alignment and reduced wear from the 5/16" shoulder diameter with tight tolerances, ensuring accurate component positioning.
- Quick assembly and secure fastening with coarse 1/4"-20 UNC threads and Class 3A fit for minimal cross-threading and vibration resistance.
- Easy installation and removal using the hex socket drive and knurled head for improved grip and torque application.
- Long-term durability and compliance meeting ASME B18.3 standards, RoHS 3, and REACH for safe, regulated use.
- Versatile industrial application due to the standard socket head profile and right-hand thread design for broad compatibility.
Professional Applications & Engineering Value
This black oxide 18-8 stainless steel shoulder screw is engineered to address common industrial challenges such as misalignment, corrosion, and mechanical failure. The 1/4"-20 UNC coarse thread with Class 3A fit ensures rapid installation and high vibration resistance, reducing downtime in assembly lines. The precisely machined 5/16" shoulder diameter provides stable bearing surfaces for pivots, gears, and linkages, minimizing wear in machinery. Made from corrosion-resistant 18-8 stainless steel with a black oxide finish, it withstands demanding environments like automotive, aerospace, and manufacturing, offering reliable performance where precision and strength are critical. The hex socket drive and knurled head further enhance usability in tight spaces, making it a top choice for engineers seeking durable, compliant fastening solutions.
Specification Summary & Compliance
This shoulder screw adheres to strict dimensional tolerances, including a Class 3A thread fit for high precision and a shoulder diameter tolerance of -0.004" to -0.002". It conforms to ASME B18.3 manufacturing standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and quality in industrial applications.
