S-92949A333 5-40 x 1" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing applications
• Precision thread engagement with Class 3A fit and UNC coarse threads ensuring secure, vibration-resistant fastening
• Easy installation and removal using standard 5/64" hex drive tools, reducing assembly time and tooling costs
• Optimized head design with rounded button profile providing a finished appearance while minimizing snagging hazards
• Full threading along 1" length offering maximum grip range and adjustment flexibility in various material thicknesses
• Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

These 5-40 UNC rounded head screws deliver critical engineering advantages in industrial fastening applications where corrosion resistance, mechanical strength, and installation efficiency are paramount. The 18-8 stainless steel composition combined with passivated finish provides exceptional protection against chemical exposure and atmospheric corrosion, making these hex drive screws ideal for machinery, electronic enclosures, and outdoor equipment. The Class 3A thread fit with coarse UNC threading ensures rapid assembly with reduced cross-threading risk, while the fully threaded design maintains consistent clamping force across varying material thicknesses. The rounded button head profile offers both aesthetic appeal and safety by eliminating sharp edges, particularly valuable in consumer-facing products and maintenance-accessible areas.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit tolerance and UNC coarse thread profile (5-40 specification). Complies with ASME B18.3 manufacturing specifications for socket cap screws. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) requirements for restricted substances. Threading extends fully along the 1" length with right-hand direction and standardized head dimensions (0.238" diameter, 0.066" height).