S-91253A060 1-72 x 3/8" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced Corrosion Resistance: Black-oxide coating on alloy steel provides reliable protection against rust and wear in demanding environments.
• Superior Thread Precision: Class 3A thread fit ensures tight, secure fastening with minimal risk of loosening or cross-threading in fine-thread applications.
• High Tensile Strength: With 130,000 psi tensile strength and Rockwell C39 hardness, these screws withstand heavy loads and repetitive stress without failure.
• Efficient Installation: Hex drive (0.050") allows for quick, tool-compatible installation with reduced slippage, saving time on assembly lines.
• Flush Mounting Capability: Standard flat head with 82° countersink angle sits seamlessly in pre-drilled holes, maintaining a smooth surface finish.
• Full Thread Engagement: Fully threaded design maximizes grip length for stronger hold in thin materials or tight spaces.
• Regulatory Compliance: Meets ASTM F835, RoHS 3, and REACH standards, ensuring safety and environmental responsibility in global supply chains.

Professional Applications & Engineering Value

This 1-72 UNF flat head screw is engineered for precision industrial applications where reliability and space constraints are critical. The black-oxide alloy steel construction combats corrosion in harsh conditions, while the fine UNF threads and Class 3A fit deliver exceptional vibration resistance in machinery, electronics, and automotive assemblies. The hex drive ensures efficient torque application, reducing installation errors, and the fully threaded design enhances load distribution in thin-section materials. Ideal for high-strength fastening in confined areas, these screws solve common issues like thread stripping and misalignment, supporting long-term operational integrity.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including Class 3A thread fit for superior tolerance and UNF fine threading (1-72 size). It complies with ASTM F835 specifications for mechanical properties and is verified as RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring no restricted substances are used. The design features an 82° countersink angle and right-hand thread direction, meeting industry requirements for consistent performance and environmental safety.