S-91500A346 5/16"-18 x 1/2" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips 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 with 316 stainless steel construction and passivated finish, ideal for harsh environments and extended service life
- High tensile strength of 70,000 psi ensures reliable performance under heavy loads and demanding industrial applications
- Precise Class 2A thread fit provides consistent engagement and reduces the risk of cross-threading during assembly
- Undercut flat head design allows for flush mounting and improved seating in countersunk holes
- Fully threaded shank offers maximum grip and holding power along the entire fastener length
- Phillips No. 4 drive enables efficient installation with standard tools while minimizing cam-out risks
- Compliance with RoHS 3 and REACH regulations ensures environmental safety and meets international supply chain requirements
Professional Applications & Engineering Value
These 5/16"-18 UNC flat head screws in 316 stainless steel deliver exceptional value in applications where corrosion resistance and mechanical strength are critical. The passivated finish enhances surface durability, preventing oxidation in marine, chemical processing, and outdoor installations. The 82° countersink angle and undercut head profile ensure a flush fit, eliminating protrusions in machinery and structural assemblies. With coarse UNC threads and full threading, they provide rapid installation and superior pull-out resistance in soft metals, plastics, and wood substrates. Engineered to ASME B18.6.3 specifications, these screws offer reliable performance in HVAC systems, food processing equipment, and architectural frameworks where RoHS and REACH compliance is mandatory.
Specification Summary & Compliance
This flat head screw features a 5/16"-18 UNC coarse thread with Class 2A fit tolerance for precise alignment. Manufacturing adheres to ASME B18.6.3 standards, ensuring dimensional consistency. The product is verified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.
