S-90403A118 4-40 x 7/8" ASME B18.13 Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer
Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Washer & Nut
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior vibration resistance with integrated internal-tooth lock washers that maintain secure fastening in high-motion environments
- Excellent corrosion protection through zinc-plated steel construction, extending service life in demanding industrial conditions
- High-strength performance with 60,000 psi tensile strength and Rockwell B69 hardness for reliable load-bearing capability
- Quick installation and removal with No. 1 Phillips drive and coarse UNC threads that reduce assembly time
- Precise thread engagement through Class 2A thread fit ensuring consistent mating with nuts and tapped holes
- Full-threaded design providing maximum grip along the entire 7/8" length for enhanced holding power
- Regulatory compliance meeting ASME B18.13 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
These zinc-plated steel rounded pan head screws with internal-tooth lock washers deliver exceptional engineering value in vibration-prone applications. The combination of 4-40 UNC coarse threads and Class 2A thread fit ensures rapid installation while maintaining precision alignment in machinery, electronic enclosures, and automotive assemblies. The zinc-plated steel construction provides reliable corrosion resistance, while the internal-tooth lock washer design prevents loosening under continuous vibration—solving critical fastening challenges in manufacturing, maintenance, and equipment repair. With 60,000 psi tensile strength and full threading, these Phillips drive screws maintain integrity in high-stress environments where fastener failure is not an option.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse thread specifications. Complies with ASME B18.13 manufacturing standards and meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance. Features include 7/8" length, No. 1 Phillips drive, and internal-tooth lock washer configuration for reliable industrial fastening performance.
