S-97768A138 4-40 Shoulder Screws
Shoulder Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments.
- Enhanced durability and wear resistance from the black oxide finish, providing long-lasting performance.
- High tensile strength of 70,000 psi ensures reliable fastening under heavy loads and stress.
- Precise alignment and smooth rotation due to the standard shoulder fit and Class 3A thread accuracy.
- Easy installation and removal with the hex drive socket and knurled head for improved grip.
- Compliance with RoHS 3 and REACH regulations guarantees safe, environmentally responsible use in global markets.
- Optimized for coarse UNC threads offering quick assembly and reduced cross-threading risks.
Professional Applications & Engineering Value
This 4-40 UNC thread shoulder screw is engineered to address critical alignment and load-bearing challenges in precision assemblies. The 1/2" shoulder length provides a stable bearing surface, minimizing component misalignment and wear in machinery, automotive, and electronics applications. Made from 18-8 stainless steel with a black oxide finish, it resists corrosion and oxidation, extending service life in demanding conditions. The Class 3A thread fit and coarse threading ensure secure, vibration-resistant connections, reducing maintenance downtime. Ideal for use in jigs, fixtures, and rotating assemblies, this screw delivers consistent performance where exact tolerances and high shear strength are paramount.
Specification Summary & Compliance
This shoulder screw features a 4-40 UNC coarse thread with Class 3A thread fit for precise engagement, and a shoulder diameter tolerance of -0.004" to -0.002". It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring adherence to environmental and safety regulations. Manufactured to deliver 70,000 psi tensile strength and 35,000 psi minimum shear strength, it supports rigorous industrial applications with reliability and consistency.
