S-91054A250 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and durable TiCN coating, ideal for harsh industrial environments
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under high stress
• Precise component alignment enabled by the accurately machined shoulder with 5/16" diameter and 3/4" length for stable assembly
• Easy installation and removal with standard hex drive (5/32") and right-hand UNC coarse threads for efficient maintenance
• Consistent thread quality with Class 2A fit ensuring smooth engagement and reduced risk of cross-threading
• Broad regulatory compliance meeting RoHS 3 and REACH standards for safe use in global markets
• Versatile application compatibility due to inch measurements and UNC thread standards fitting common machinery designs

Professional Applications & Engineering Value

This precision shoulder screw addresses critical alignment and durability challenges in industrial settings. The 18-8 stainless steel core provides inherent corrosion resistance, while the TiCN coating significantly enhances surface hardness and wear resistance, extending service life in high-friction applications. The precise shoulder fit with tight diameter and length tolerances ensures accurate positioning of moving parts in assemblies like rotating shafts, pivots, and gears, minimizing vibration and misalignment. With a coarse UNC thread and hex drive, it offers quick installation in equipment maintenance and production lines, reducing downtime. Ideal for machinery, automotive, and precision instruments, this screw delivers reliable performance where strength and dimensional accuracy are paramount.

Specification Summary & Compliance

The screw features a 1/4"-20 UNC coarse thread with Class 2A fit for standard tolerance, ensuring compatibility with common nuts and threaded holes. The shoulder maintains precise dimensions: diameter of 5/16" (tolerance: -0.002" to 0") and length of 3/4" (tolerance: 0" to 0.003"). Manufactured to consistent quality standards, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally safe and regulated industrial use.