S-93310A542 1/4"-20 x 1" ASME B18.3, ASTM F879, MIL-DTL-18240 Thread-Locking Stainless Steel Button Head Hex-Drive Screws
Thread-Locking Stainless Steel Button Head Hex-Drive 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
- Vibration-resistant locking with permanent Nylon Patch that maintains secure fastening from -70° to 250° F, preventing loosening in dynamic industrial environments.
- Superior corrosion resistance thanks to 18-8 Stainless Steel construction, ensuring long-term reliability in harsh or outdoor applications.
- High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical assemblies.
- Precise thread engagement with Class 3A UNC coarse threads providing reliable fit and reduced cross-threading risks.
- Easy installation and removal using a standard 5/32" hex drive, allowing for efficient maintenance with common tools.
- Full threading along the 1" length offers maximum adjustability and holding power in various material thicknesses.
- Compliance with major industrial standards including ASME B18.3, ASTM F879, and MIL-DTL-18240, ensuring quality and interoperability.
Professional Applications & Engineering Value
This 1/4-20 x 1" nylon patch locking screw is engineered to address critical challenges in industrial settings where vibration, thermal cycling, and corrosive conditions compromise fastener integrity. The 18-8 Stainless Steel material provides excellent resistance to rust and oxidation, making it ideal for machinery, automotive, and marine applications. The Nylon Patch thread locker delivers consistent locking force without requiring separate adhesives, simplifying assembly while ensuring joints remain secure under stress. With a coarse UNC thread and Class 3A fit, it offers quick installation and reliable performance in metals, plastics, and composites, reducing downtime and maintenance costs in high-vibration environments.
Specification Summary & Compliance
This fully threaded rounded head hex drive screw features a 1/4"-20 UNC coarse thread with Class 3A precision tolerance for accurate fit. It is manufactured in compliance with ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications, ensuring consistent quality and performance. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for global industrial use.
