S-91829A517 4-40 MS51575-4, NASM51575 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 and passivated finish, ensuring longevity in harsh environments
- Precise alignment and positioning thanks to the 1/8" shoulder diameter with tight tolerance for stable component mounting
- High tensile strength of 70,000 psi provides reliable load-bearing capacity for demanding applications
- Easy installation and removal with socket head design and standard UNC coarse threading for efficient assembly
- Consistent thread quality with Class 2A fit ensuring smooth engagement and reduced cross-threading risks
- Durable mechanical performance backed by Rockwell B55 hardness for wear resistance under repeated use
- Compliance with industry standards including MS51575-4, RoHS 3, and REACH for quality assurance and regulatory safety
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw is engineered to address critical alignment and stability challenges in precision assemblies. The 1/8" shoulder diameter with precise fit tolerance ensures components remain securely positioned, reducing misalignment and vibration-induced failures. Made from 18-8 stainless steel with a passivated finish, it resists corrosion in industrial settings, extending service life in machinery, electronics, and automotive systems. The socket head design and coarse thread spacing facilitate quick installation, while the high tensile strength supports heavy-duty applications. Ideal for use in alignment screws and shoulder bolts, this fastener delivers reliability where exact tolerances and durability are paramount.
Specification Summary & Compliance
The screw adheres to Class 2A thread fit and UNC standards for dimensional accuracy, with shoulder diameter tolerance of -0.001" to 0" and length tolerance of 0" to 0.002". It meets MS51575-4 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.
