S-91771A746 4-48 x 1" 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 passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable, long-lasting performance
- Precise thread engagement through Class 2A UNF fine threading, ensuring secure fastening and vibration resistance
- Streamlined flush installation with standard 82° countersink angle and flat head design for smooth surface finishing
- Efficient drive compatibility with Phillips No. 1 drive style, enabling quick installation with standard tools
- Full thread coverage along the 1" length provides maximum grip and load distribution across the entire fastener
- Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
These 4-48 UNF flat head screws deliver critical performance advantages in precision assembly applications where corrosion resistance and flush mounting are essential. The passivated 18-8 stainless steel construction provides excellent protection against oxidation and chemical exposure, making them ideal for industrial equipment, electronic enclosures, and marine components. The fine UNF threading ensures superior holding power in thin materials and delicate assemblies, while the 82° countersink angle creates a seamless finish that eliminates protrusions. With full threading along the entire 1" length, these screws distribute clamping force evenly, preventing material distortion and maintaining joint integrity under vibration and dynamic loads common in manufacturing and machinery applications.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 standards with Class 2A thread fit tolerance for consistent performance. Features UNF fine threads (4-48) with right-hand direction and fully threaded design. The 82° countersink angle conforms to industry standards for flat head fasteners. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.
