S-98070A111 2-56 x 1/4" Sealing Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior sealing performance with silicone rubber O-ring that withstands extreme temperatures from -80° to 400°F and pressures up to 1500 psi
• Exceptional corrosion resistance through 18-8 stainless steel construction with passivated finish for extended service life in harsh environments
• Reliable thread engagement with Class 2A UNC coarse threads ensuring consistent fastening and vibration resistance
• Flush mounting capability featuring flat head with 100° countersink angle and undercut profile for seamless surface integration
• Easy installation and removal with Phillips No. 1 drive design providing secure tool engagement during assembly
• Maximum tensile strength of 70,000 psi for demanding applications requiring high mechanical performance
• Environmental compliance meeting RoHS 3 and REACH standards for safe use across regulated industries

Professional Applications & Engineering Value

This 2-56 UNC flat head Phillips screw with integrated silicone rubber O-ring delivers critical sealing solutions for industrial applications where pressure integrity and environmental protection are paramount. The 18-8 stainless steel construction combined with passivated finish provides exceptional corrosion resistance in demanding environments such as chemical processing, marine equipment, and outdoor machinery. The fully threaded design with Class 2A thread fit ensures consistent sealing pressure distribution, while the flat head with undercut profile allows for flush mounting in precision assemblies. Engineered to maintain seal integrity under 1500 psi pressure and extreme temperature fluctuations, this fastener solves critical leakage challenges in hydraulic systems, pneumatic controls, and fluid handling equipment where reliability is non-negotiable.

Specification Summary & Compliance

This sealing screw features precision 2-56 UNC coarse threads with Class 2A thread fit for reliable engagement. The fully threaded design measures 1/4" in length with a 100° countersink angle and accommodates maximum hole diameter of 0.095". Manufactured from 18-8 stainless steel with passivated finish, it delivers 70,000 psi tensile strength and incorporates a silicone rubber O-ring rated for -80° to 400°F. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards.