S-92805A112 4-40 x 1/2" ASME B18.3, ASTM F879, MIL-DTL-18240 Stainless Steel Thread-Locking Hex Drive Flat Head Screws
Stainless Steel Thread-Locking Hex Drive Flat Head 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
- Vibration-resistant locking with nylon patch thread locker ensures secure fastening in high-stress environments, maintaining integrity from -65° to 250°F.
- Exceptional corrosion resistance from 18-8 stainless steel construction, ideal for harsh industrial or outdoor applications.
- High tensile strength of 70,000 psi provides reliable load-bearing capacity for demanding mechanical assemblies.
- Precise Class 3A thread fit guarantees smooth installation and superior engagement in tapped holes.
- Hex drive design with 1/16" drive size allows for easy, high-torque installation without cam-out.
- 82° countersink angle and flat head profile enables flush mounting for streamlined surfaces and reduced snagging.
- Full threading along the 1/2" length ensures maximum grip and adjustability in various material thicknesses.
Professional Applications & Engineering Value
Engineered for precision and durability, these 4-40 UNC flat head screws with nylon patch locking address critical challenges in industrial assembly, such as vibration-induced loosening and corrosion in machinery, electronics, and automotive components. The 18-8 stainless steel material offers excellent resistance to rust and chemicals, while the coarse thread spacing and Class 3A thread fit enhance installation speed and holding power in metals and plastics. With a Rockwell B55 hardness and 70,000 psi tensile strength, they withstand repetitive stress, making them ideal for heavy-duty fastening where reliability and compliance with stringent standards are paramount.
Specification Summary & Compliance
This screw features a 4-40 UNC coarse thread with Class 3A precision fit, ensuring tight tolerances for consistent performance. It is manufactured in accordance with ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications, and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting safe and sustainable industrial use.
