S-90298A576 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 and passivated finish, ideal for harsh industrial environments.
- High tensile strength of 70,000 psi ensures reliable performance under heavy loads and vibration.
- Precise Class 3A thread fit provides secure, tight fastening with minimal risk of loosening.
- Knurled socket head with hex drive allows for easy installation and removal, even in tight spaces.
- Accurate shoulder dimensions (±0.001" diameter tolerance) enable consistent alignment in assemblies.
- Compliance with ASME B18.3 standards guarantees interchangeability and quality assurance.
- RoHS 3 and REACH compliant for safe use in regulated industries and global markets.
Professional Applications & Engineering Value
This 1/4"-20 UNC shoulder screw is engineered to address critical alignment and durability challenges in precision machinery, automation systems, and heavy-duty equipment. The 18-8 stainless steel construction, combined with a passivated finish, resists corrosion and wear, extending service life in demanding conditions. The 5/16" shoulder diameter with tight tolerances ensures exact positioning of components, reducing assembly errors and maintenance downtime. With a Rockwell B55 hardness and 70,000 psi tensile strength, it withstands high stress and repetitive motion, making it ideal for pivots, shafts, and rotating mechanisms in industrial applications. The hex drive and knurled head facilitate quick, secure installation, enhancing productivity on the production line.
Specification Summary & Compliance
This shoulder screw features 1/4"-20 UNC Class 3A threads with coarse spacing for robust fastening, and precise shoulder dimensions (diameter: 5/16" ±0.001", length: 3/8" ±0.005") to ensure consistent fit. Manufactured in accordance with ASME B18.3 specifications, it meets high standards for dimensional accuracy and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and sustainable use across various industries.
