S-93310A321 2-56 x 1/8" 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
- Superior vibration resistance with a permanent nylon patch thread locker that ensures reliable performance in dynamic environments.
- Excellent corrosion resistance due to 18-8 stainless steel construction, ideal for harsh or outdoor industrial settings.
- High tensile strength of 70,000 psi provides durable, secure fastening for demanding applications.
- Wide temperature tolerance from -70° to 250°F, maintaining locking integrity across varied operating conditions.
- Precise Class 3A thread fit ensures smooth installation and consistent engagement with mating components.
- Fully threaded design offers maximum grip and load distribution along the entire screw length.
- Compliance with major standards including ASME B18.3, ASTM F879, and MIL-DTL-18240, guaranteeing quality and interoperability.
Professional Applications & Engineering Value
This 2-56 UNC nylon patch locking rounded head screw is engineered to address common industrial challenges such as loosening under vibration and exposure to corrosive elements. The 18-8 stainless steel material provides inherent resistance to rust and oxidation, while the nylon patch thread locker delivers permanent locking without requiring additional adhesives. Its coarse thread and Class 3A fit facilitate quick assembly in metals and plastics, reducing installation time and improving reliability in automotive, aerospace, and electronics applications. The hex drive allows for high-torque installation with standard tools, ensuring a secure fit in confined spaces where vibration resistance is critical.
Specification Summary & Compliance
The screw features a 2-56 UNC coarse thread with Class 3A precision tolerance for consistent performance. It is manufactured in compliance with ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications, ensuring adherence to rigorous industrial standards. Additionally, the product is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, supporting environmentally responsible and safe usage in global markets.
