S-90403A110 4-40 x 1/2" 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-stress environments
- Enhanced corrosion protection through zinc-plated steel construction, extending service life in industrial settings
- High tensile strength of 60,000 psi ensures reliable performance under heavy loads and mechanical stress
- Precise Class 2A thread fit provides smooth installation and consistent engagement in UNC coarse threaded applications
- Optimized Phillips No. 1 drive enables efficient installation with standard tools while minimizing cam-out risks
- Full threading along the 1/2" length allows maximum adjustability and holding power throughout the fastener
- Rockwell B69 hardness rating delivers excellent durability and resistance to wear in repetitive assembly operations
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel screws with internal-tooth lock washers address critical vibration-induced loosening challenges in industrial equipment, electronic enclosures, and machinery assemblies. The coarse thread design combined with Class 2A thread fit ensures rapid installation and reliable performance in materials where fine threads might strip or fail. The zinc-plated steel construction provides essential corrosion resistance for environments exposed to moisture or chemicals, while the pan head profile offers a low-profile solution that won't interfere with adjacent components. Engineered to maintain clamping force under dynamic loads, these fully threaded screws deliver consistent performance in automotive, aerospace, and manufacturing applications where vibration resistance and ASME B18.13 compliance are mandatory requirements.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (4-40 size) and 1/2" length. Complies with ASME B18.13 manufacturing specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features fully threaded design with right-hand thread direction and internal-tooth lock washers integrated for secure fastening applications.
