S-91794A115 4-40 x 1" ASME B18.6.3 Stainless Steel Fillister Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
• High tensile strength of 70,000 psi provides dependable fastening under significant mechanical stress, reducing failure risks.
• Rockwell B55 hardness offers excellent durability and wear resistance, maintaining thread integrity through repeated use.
• Coarse UNC threads with Class 2A fit enable quick, easy installation and secure engagement in a wide range of materials.
• Fully threaded design ensures maximum grip along the entire 1" length, enhancing holding power in demanding applications.
• Slotted fillister head allows for straightforward installation with standard tools, streamlining assembly processes.
• Compliance with ASME B18.6.3, RoHS, and REACH guarantees adherence to industry standards and environmental regulations, supporting responsible sourcing.

Professional Applications & Engineering Value

This 4-40 UNC rounded head slotted screw is engineered to address critical fastening challenges in industrial settings. The 18-8 stainless steel material, combined with a passivated finish, provides exceptional resistance to corrosion and oxidation, making it ideal for use in machinery, electronic enclosures, and outdoor equipment where moisture or chemicals are present. The coarse thread and Class 2A fit ensure reliable performance in soft metals or plastics, reducing cross-threading risks and speeding up assembly lines. With a high tensile strength of 70,000 psi and full threading, it delivers consistent clamping force, preventing loosening in vibrating environments. This screw is a trusted solution for applications demanding precision, durability, and compliance with ASME B18.6.3 standards, offering long-term value in manufacturing, automotive, and aerospace sectors.

Specification Summary & Compliance

This screw features a 4-40 UNC coarse thread with Class 2A tolerance for precise fit, and is fully threaded over a 1" length. It meets ASME B18.6.3 specifications for dimensional accuracy and performance. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental and safety regulations for hazardous substances.