S-99154A405 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Corrosion-resistant 18-8 stainless steel construction ensures long-term durability and reliability in harsh industrial environments.
• Precise Class 2A thread fit guarantees smooth assembly and secure fastening, reducing installation time and improving joint integrity.
• Low profile socket head design allows for compact installations and easy access in confined spaces with standard tools.
• High tensile strength of 70,000 psi provides robust load-bearing capacity for demanding mechanical applications.
• Rockwell B55 hardness offers excellent wear resistance, maintaining dimensional stability under repeated use.
• Tight shoulder diameter and length tolerances enable accurate alignment and positioning of components, minimizing assembly errors.
• RoHS 3 and REACH compliance ensures environmental safety and regulatory adherence for global supply chains.

Professional Applications & Engineering Value

Engineered for precision, this 4-40 UNC shoulder screw with a 1/8" shoulder diameter and low profile socket head addresses critical alignment and space constraints in industrial assemblies. The 18-8 stainless steel material provides superior corrosion resistance, ideal for applications in electronics, machinery, and automotive sectors where exposure to moisture or chemicals is common. The coarse UNC threads and Class 2A fit facilitate quick, reliable fastening, reducing the risk of cross-threading. With a 5/16" shoulder length and precise tolerances, it ensures components like gears, pulleys, or linkages are securely positioned, enhancing overall system accuracy and reducing maintenance needs. This screw is a dependable solution for engineers seeking durability, compliance, and performance in right-hand thread configurations.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. Key specifications include a thread size of 4-40, shoulder diameter of 1/8" with tolerance from -0.001" to 0", and shoulder length of 5/16" with tolerance from 0" to 0.002". It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial use.