S-90403A201 8-32 x 1 1/4" ASME B18.13 Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer

Key Features & Benefits at a Glance

• Superior Vibration Resistance: Integrated internal-tooth lock washer provides exceptional locking force, preventing loosening in high-vibration industrial environments.
• Enhanced Corrosion Protection: Zinc-plated steel construction offers reliable defense against rust and corrosion, extending service life in demanding conditions.
• High Tensile Strength: Rated at 60,000 PSI tensile strength with Rockwell B69 hardness for dependable performance under heavy loads and stress.
• Optimized Drive Engagement: Phillips No. 2 drive style ensures secure bit engagement and reduces cam-out during installation.
• Quick Assembly Efficiency: Coarse UNC Class 2A threads enable faster installation and provide excellent holding power in various materials.
• Secure Fastening Solution: Pan head design with standard rounded profile distributes clamping force evenly while the lock washer maintains tension.
• Full Thread Coverage: 1-1/4" fully threaded shank maximizes grip length and provides consistent holding strength along the entire fastener.

Professional Applications & Engineering Value

These zinc-plated steel Phillips pan head screws with internal-tooth lock washers deliver critical vibration resistance for machinery, electrical enclosures, and assembly line equipment where constant motion threatens fastener integrity. The coarse UNC threads (8-32 size) cut efficiently into materials while the Class 2A thread fit ensures consistent engagement without binding. The combination of 60,000 PSI tensile strength and Rockwell B69 hardness provides reliable performance in structural applications, while the integrated locking mechanism eliminates the need for separate washers, streamlining inventory and assembly processes. These fully threaded screws are engineered to maintain clamp force in automotive, manufacturing, and heavy equipment applications where vibration-induced loosening can cause operational failures.

Specification Summary & Compliance

This 8-32 x 1-1/4" screw features UNC coarse threads with Class 2A thread fit tolerance for reliable engagement. Manufacturing and dimensional compliance meets ASME B18.13 specifications. The product is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental regulatory adherence for global industrial applications.