S-94518A111 4-40 x 1/2" QQ-P-35, MS24671-3 Stainless Steel Hex Drive Flat Head Screws
Stainless 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 from 18-8 Stainless Steel with passivated finish, ideal for harsh environments and long-term reliability.
- High tensile strength of 70,000 psi ensures secure, durable fastening in demanding mechanical assemblies.
- Precise Class 3A thread fit provides tighter tolerances for improved assembly accuracy and vibration resistance.
- Standard 82° countersink angle allows the flat head to sit flush with surfaces, creating a smooth, professional finish.
- Hex drive (1/16") design offers excellent torque transmission and reduces the risk of tool slippage during installation.
- Fully threaded UNC coarse thread enables faster installation and stronger holding power in a variety of materials.
- Compliance with Fed. Spec. QQ-P-35, RoHS 3, and REACH guarantees product quality, safety, and environmental standards are met.
Professional Applications & Engineering Value
This 4-40 UNC flat head screw is engineered to address common industrial challenges such as corrosion, vibration loosening, and assembly efficiency. The 18-8 Stainless Steel material, combined with a passivated finish, provides exceptional resistance to rust and chemical exposure, making it suitable for electronics, machinery, and outdoor equipment. The Class 3A thread fit and coarse thread spacing ensure reliable engagement and reduced cross-threading risks, while the hex drive allows for high-torque applications without cam-out. Its fully threaded design and 82° countersink enable quick, flush mounting in panels and fixtures, streamlining production and maintenance processes in industrial and aerospace settings where precision and durability are critical.
Specification Summary & Compliance
This screw features a 4-40 UNC coarse thread with Class 3A thread fit for high precision, a length of 1/2", and a right-hand thread direction. It is manufactured in compliance with Fed. Spec. QQ-P-35 (MS24671-3), ensuring adherence to strict dimensional and performance standards. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming it is free from hazardous substances and safe for various industrial applications.
