S-91829A308 1/4"-20 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 from 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
- Precise component alignment ensured by a 3/8" diameter shoulder with tight tolerances (±0.002") for minimal play and vibration.
- High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical applications.
- Reliable thread engagement provided by the Class 2A UNC coarse thread, ensuring easy assembly and secure fastening.
- Convenient installation and removal with a standard socket head design for efficient tool access.
- Environmental and regulatory compliance with RoHS 3 and REACH, making it suitable for global industrial supply chains.
- Durable, long-lasting operation due to the material's inherent strength and the protective passivated surface treatment.
Professional Applications & Engineering Value
This 1/4-20 UNC shoulder screw is engineered to solve critical alignment and durability challenges in precision assemblies. The 3/8" shoulder diameter acts as a precise axle or pivot, maintaining exact positioning in machinery, rotating components, and jigs. Manufactured from 18-8 stainless steel with a passivated finish, it resists oxidation and chemical exposure, extending service life in demanding settings like automation, packaging equipment, and medical devices. The Class 2A thread fit and coarse UNC thread facilitate quick assembly while the socket head allows for high-torque installation in confined spaces. Its robust construction prevents shear failure and wear, making it a reliable choice for OEMs and maintenance teams requiring repeatable, secure fastening solutions.
Specification Summary & Compliance
This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent engagement. The shoulder features precise dimensional control with a diameter tolerance of -0.001" to 0" and length tolerance of 0" to 0.002". It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free of restricted hazardous substances and suitable for industrial and international markets.
