S-91255A545 1/4"-20 x 2" ASTM F835 Steel Button Head Hex-Drive Screws
Steel Button Head Hex-Drive Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Exceptional corrosion resistance with black-oxide coating, ideal for harsh industrial environments
- Superior tensile strength rated at 120,000 psi for heavy-duty applications requiring reliable load-bearing capacity
- Precise Class 3A thread fit ensures secure fastening and vibration resistance in critical assemblies
- High hardness (Rockwell C39) provides excellent wear resistance and long-term durability
- Partially threaded design allows for optimal clamping force and reduced risk of cross-threading
- 5/32" hex drive enables easy installation with standard tools, minimizing assembly time
- Compliance with ASME B18.3 and ASTM F835 guarantees consistent quality and interchangeability
Professional Applications & Engineering Value
Engineered for demanding industrial and commercial settings, these black-oxide alloy steel rounded head hex screws address common challenges such as fastener failure under stress and corrosion in humid or chemically aggressive environments. The UNC coarse thread design ensures rapid installation and reliable grip in materials like steel and cast iron, while the partially threaded shank concentrates clamping force precisely where needed. With a Rockwell C39 hardness and 120,000 psi tensile strength, these screws withstand high vibration and dynamic loads in machinery, automotive, and construction applications, reducing maintenance frequency and downtime. The rounded button head offers a low-profile finish that minimizes snagging and enhances safety in exposed assemblies.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC thread with Class 3A fit for tight dimensional accuracy and coarse thread spacing. It is manufactured to meet ASME B18.3 and ASTM F835 specifications, ensuring consistent performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible sourcing and usage in global markets.
