S-91770A645 1/4"-28 x 3/4" ASME B18.6.3 Stainless Steel Truss Head Phillips Screws
Stainless Steel Truss Head Phillips 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
- Exceptional corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Superior load distribution from the wide rounded truss head design, reducing surface pressure and material damage
- High tensile strength of 70,000 psi ensures reliable performance under heavy-duty mechanical stress
- Precision fine threading (1/4"-28 UNF) provides secure, vibration-resistant fastening in critical assemblies
- Easy installation and removal with Phillips No. 3 drive, minimizing tool slippage and assembly time
- Full threading along the 3/4" length offers maximum grip and adjustment flexibility in various material thicknesses
- Compliance with ASME B18.6.3 and environmental regulations guarantees consistent quality and safe usage
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 1/4-28 UNF rounded truss head screws deliver exceptional performance in machinery assembly, electrical enclosures, and structural frameworks. The passivated 18-8 stainless steel provides excellent resistance to oxidation and chemical exposure, extending service life in corrosive environments. The wide truss head profile distributes clamping force over a larger area, preventing surface deformation on softer materials like plastics or composite panels. With Class 2A thread fit and fine thread spacing, these screws maintain tight tolerances in high-vibration settings, reducing maintenance needs and ensuring long-term operational reliability for OEMs and MRO professionals.
Specification Summary & Compliance
This fastener features 1/4"-28 UNF fine threads with Class 2A tolerance for precise fit, manufactured to ASME B18.6.3 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety. The screw maintains 70,000 psi tensile strength and Rockwell B70 hardness for consistent mechanical performance.
