S-91500A308 4-40 x 3/4" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips 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
- Superior corrosion resistance with 316 Stainless Steel construction and passivated finish, ideal for harsh environments and extended service life
- High-strength performance delivering 70,000 psi tensile strength and Rockwell B80 hardness for reliable, durable fastening in demanding applications
- Precision thread fit with Class 2A UNC coarse threads ensuring easy installation and consistent engagement for assembly efficiency
- Optimized flush mounting featuring a standard flat head with 82° countersink angle for a smooth, secure finish in countersunk holes
- Enhanced drive stability with Phillips No. 1 drive style providing controlled torque application and reduced risk of cam-out
- Full threading along the 3/4" length offers maximum grip and adjustability across the entire fastener
- Regulatory compliance meeting ASME B18.6.3 specifications, RoHS 3, and REACH standards for quality and environmental safety
Professional Applications & Engineering Value
Engineered for precision and longevity, these 4-40 UNC flat head screws in 316 Stainless Steel address critical industrial challenges such as corrosion in marine, chemical, and outdoor settings. The passivated finish enhances surface durability, while the coarse thread design and Class 2A thread fit facilitate quick assembly with minimal cross-threading risk. Ideal for machinery, electronics, and structural components, these fully threaded fasteners provide uniform clamping force and vibration resistance. The flat head profile with an 82° countersink angle ensures a flush fit, reducing protrusion and improving aerodynamic or aesthetic finishes in industrial applications.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit tolerances per UNC standards, with a 3/4" length and right-hand thread direction. Manufactured in compliance with ASME B18.6.3 specifications, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring material safety and performance reliability for professional use.
