S-98885A218 5/16"-18 x 1/2" ASME B18.3, UL 94 V-0 Plastic Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional thermal stability for reliable performance in extreme environments from -50° to 500° F
• High tensile strength of 25,000 psi ensures secure fastening in demanding mechanical applications
• Chemical and corrosion resistance of PEEK plastic provides longevity in harsh industrial settings
• Precision Class 2A thread fit with 5/16"-18 UNC coarse threads for easy installation and vibration resistance
• Standard 1/4" hex drive enables quick, secure tool engagement with common industrial drivers
• Fully threaded design offers maximum grip length and uniform load distribution
• Comprehensive compliance with ASME B18.3, UL 94 V-0 flammability rating, RoHS 3 and REACH regulations

Professional Applications & Engineering Value

These PEEK plastic socket head cap screws deliver critical performance advantages in challenging environments where metal fasteners would fail. The beige PEEK material maintains dimensional stability across extreme temperature fluctuations from -50° to 500° F, eliminating thermal expansion concerns in precision assemblies. The 5/16"-18 UNC coarse thread with Class 2A fit provides excellent engagement in plastic and soft materials while resisting vibration loosening. With 25,000 psi tensile strength and chemical inertness, these screws are ideal for semiconductor equipment, medical devices, food processing machinery, and aerospace applications where corrosion resistance, electrical insulation, and regulatory compliance are mandatory. The 1/4" hex drive and fully threaded design ensure consistent installation torque and maximum thread engagement in deep tapped holes.

Specification Summary & Compliance

This socket head cap screw features precision 5/16"-18 UNC threads with Class 2A tolerance for consistent fit and reliable performance. Manufactured to ASME B18.3 specifications with complete regulatory compliance including UL 94 V-0 flammability rating, RoHS 3 (2015/863/EU) compliance, and REACH (EC 1907/2006) adherence. The 1/2" length and fully threaded design provide versatile fastening solutions while maintaining dimensional accuracy throughout the operating temperature range.