S-94328A953 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Precision Class 3A thread fit provides superior engagement and alignment, minimizing play and vibration in assembled components.
• Corrosion-resistant black oxide finish extends service life by protecting against rust and wear in harsh industrial environments.
• Knurled low-profile socket head offers improved grip and easy installation in confined spaces with a standard 5/32" hex drive.
• Durable alloy steel construction with Rockwell C30 hardness maintains structural integrity under repeated loads and impacts.
• Coarse 1/4"-20 UNC threads enable quick assembly and disassembly, saving time in maintenance and production cycles.
• Strict dimensional tolerances on the shoulder diameter and length ensure consistent fit and precise positioning in machinery.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical alignment and durability challenges in industrial settings. The black oxide finish provides a protective layer that resists corrosion, making it ideal for applications exposed to moisture or chemicals. With a Class 3A thread fit and coarse 1/4"-20 UNC threads, it ensures secure fastening in dynamic environments where vibration loosening is a concern. The low-profile socket head with knurling allows for easy installation in tight spaces, while the precise shoulder dimensions facilitate accurate component positioning in assemblies like pivots, guides, and rotating mechanisms. Its high tensile strength and hardness support heavy-duty use in machinery, automotive, and automation systems, reducing downtime and maintenance costs.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit for tight tolerances, and dimensions include a shoulder diameter of 5/16" (tolerance: -0.004" to -0.002") and shoulder length of 1 1/4" (tolerance: -0.005" to 0.005"). Manufactured from alloy steel with a tensile strength of 140,000 psi and Rockwell C30 hardness, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for industrial components.