S-91385A178 3/4"-10 x 5/8" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with permanent nylon patch thread locker prevents loosening under extreme conditions
• Exceptional temperature tolerance maintains locking performance from -50°F to 250°F for demanding environments
• Superior holding power through Class 3A thread fit ensures precise, secure fastening in critical applications
• Enhanced durability with Rockwell C45 hardness black-oxide alloy steel resists corrosion and wear
• Secure installation via 3/8" hex drive provides maximum torque transfer without head interference
• Reliable positioning with cup tip design concentrates contact pressure for superior component alignment
• Industry compliance meets ASME B18.3 specifications and environmental regulations for global applications

Professional Applications & Engineering Value

Engineered for precision industrial applications where vibration resistance and permanent positioning are critical, this 3/4"-10 UNC set screw solves common engineering challenges in machinery assembly, automotive components, and heavy equipment. The black-oxide alloy steel construction combined with Rockwell C45 hardness provides exceptional resistance to corrosion and mechanical stress, while the permanent nylon patch thread locker eliminates the need for secondary locking mechanisms. The headless hex drive design allows for flush mounting in confined spaces, and the coarse UNC threads with Class 3A fit ensure rapid installation with maximum clamping force. Ideal for securing gears, pulleys, and collars where thermal cycling and dynamic loads would compromise standard fasteners.

Specification Summary & Compliance

This hex headless set screw features 3/4"-10 UNC coarse threads with Class 3A thread fit for precision tolerance, right-hand thread direction, and cup tip configuration. Manufactured to ASME B18.3 specifications (ASTM F912) with Rockwell C45 hardness and black-oxide surface treatment. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for global industrial use.