S-94518A105 4-40 x 1/4" QQ-P-35, MS24671-1 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for long-lasting performance in harsh industrial environments
• Precise Class 3A thread fit ensures secure, vibration-resistant connections with minimal risk of loosening during operation
• High tensile strength of 70,000 psi provides reliable fastening integrity under significant mechanical stress
• 82° countersink angle flat head design allows for flush mounting to prevent snagging and maintain smooth surface profiles
• Hex drive (1/16") compatibility enables quick installation and high torque application with standard tools
• Full threading along 1/4" length maximizes grip range and load distribution across connected materials
• Compliance with environmental regulations including RoHS 3 and REACH ensures safe usage in regulated industries

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 4-40 UNC flat head screws solve critical fastening challenges where corrosion resistance and precision threading are paramount. The 18-8 stainless steel material combined with passivated finish provides exceptional protection against chemical exposure and atmospheric corrosion, making them ideal for electronics enclosures, machinery assemblies, and marine equipment. The coarse thread spacing and Class 3A thread fit ensure rapid installation while maintaining secure connections in vibration-prone environments. The hex drive design allows for high-torque applications without cam-out issues, significantly reducing assembly time in production lines. These fully threaded screws with standardized 82° countersink angle deliver consistent performance across automotive, aerospace, and industrial manufacturing applications where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to exacting standards, these screws feature 4-40 UNC coarse threads with Class 3A precision fit for superior dimensional accuracy. Compliance with Fed. Spec. QQ-P-35 (MS24671-1) ensures consistent quality and interchangeability. The components meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming they contain no restricted hazardous substances. With right-hand threading and standard flat head profile, these fasteners deliver reliable performance across regulated industrial applications.