S-94361A325 1/4"-28 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability & Corrosion Resistance: Black oxide finish provides reliable protection against rust and wear in demanding industrial environments.
• Superior Thread Precision & Reliability: Class 3A fit and UNF fine threads ensure tight, secure fastening with minimal risk of loosening under vibration.
• High Tensile Strength for Heavy-Duty Use: Alloy steel construction with 140,000 psi tensile strength supports high-stress applications without failure.
• Precise Shoulder Positioning: Controlled shoulder diameter and length tolerances enable accurate alignment and spacing in assemblies.
• Easy Installation & Removal: Hex socket drive (5/32") and knurled head allow for quick, secure tool engagement and manual handling.
• Consistent Hardness & Wear Resistance: Rockwell C32 hardness ensures long-term performance and resistance to deformation.
• Compliance with Environmental Standards: Meets RoHS 3 and REACH regulations, ensuring safe use in regulated industries.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in precision assembly and machinery. The Class 3A UNF fine threads provide exceptional thread engagement, reducing the risk of cross-threading and ensuring reliable fastening in high-vibration settings like automotive or aerospace components. The black oxide finish enhances corrosion resistance, extending service life in humid or chemically exposed environments. With a 5/16" shoulder diameter and 7/16" shoulder length, it offers exact positioning for rotating parts, bearings, or linkages, minimizing misalignment and wear. Ideal for industrial shoulder screw applications requiring both strength and dimensional accuracy, this component delivers consistent performance in robotics, conveyor systems, and precision instruments.

Specification Summary & Compliance

This shoulder screw adheres to UNF thread standards with a Class 3A fit for high precision. Dimensions include a shoulder diameter of 5/16" (tolerance: -0.004" to -0.002") and shoulder length of 7/16" (tolerance: -0.005" to 0.005"), ensuring exact assembly requirements. It is manufactured to meet RoHS 3 (2015/863/EU) compliance with exemption 6(a) and REACH (EC 1907/2006) standards, confirming its suitability for regulated industrial use.