S-91263A569 1/4"-20 x 2 3/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws
Alloy Steel Hex Drive Flat Head 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 zinc plating, extending service life in harsh industrial environments
- Exceptional tensile strength of 130,000 psi ensures reliable performance under high-stress applications
- Precise Class 3A thread fit provides secure fastening with minimal risk of loosening or cross-threading
- 82° countersink angle allows for flush mounting in standard countersunk holes, improving aesthetics and safety
- Partially threaded design enables optimal clamping force distribution and vibration resistance
- Hex drive compatibility with 5/32" tools facilitates quick installation and removal with standard equipment
- Rockwell C39 hardness maintains thread integrity and prevents stripping during repeated use
Professional Applications & Engineering Value
These zinc-plated alloy steel flat head screws with 1/4"-20 UNC coarse threading deliver critical performance advantages for industrial assembly applications. The combination of 130,000 psi tensile strength and Rockwell C39 hardness ensures reliable fastening in high-vibration environments where joint integrity is paramount. The partially threaded design concentrates clamping force precisely where needed, while the 82° countersink angle provides seamless flush mounting in machinery, equipment frames, and structural components. Engineered to withstand demanding conditions, these hex drive screws offer consistent performance in manufacturing, automotive, and heavy equipment applications where Class 3A thread fit precision prevents costly assembly errors and maintenance downtime.
Specification Summary & Compliance
Manufactured to exacting ASTM F835 specifications with Class 3A thread fit tolerance and UNC coarse threading standards. The 1/4"-20 thread size with 2 3/4" length and partial threading ensures dimensional consistency across production batches. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations guarantees safe use in regulated industries and international markets.
