S-90403A190 8-32 x 1/4" 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 an integrated internal-tooth lock washer that prevents loosening under dynamic loads
- High tensile strength of 60,000 psi ensures reliable performance in demanding industrial applications
- Zinc-plated steel construction provides excellent corrosion resistance for extended service life
- Fully threaded UNC coarse thread design delivers faster installation and superior holding power
- Phillips No. 2 drive with pan head offers comfortable driving and flush mounting capabilities
- Class 2A thread fit guarantees precise dimensional accuracy and smooth assembly
- Rockwell B69 hardness maintains thread integrity and prevents stripping during installation
Professional Applications & Engineering Value
These zinc-plated steel screws with internal-tooth lock washers solve critical vibration-induced loosening problems in industrial equipment, machinery assembly, and electronic enclosures. The combination of 60,000 psi tensile strength and Rockwell B69 hardness ensures the 8-32 UNC coarse threads maintain integrity under stress, while the Phillips pan head design allows for efficient installation in confined spaces. The integrated locking mechanism provides permanent fastening solutions where thermal cycling and mechanical vibrations would compromise standard fasteners, making these fully threaded screws ideal for automotive, manufacturing, and electrical applications requiring reliable, long-term performance.
Specification Summary & Compliance
This 8-32 x 1/4" screw features Class 2A thread fit with UNC coarse threading and meets ASME B18.13 manufacturing specifications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors. The zinc-plated steel construction with internal-tooth lock washer provides dimensional accuracy per standardized inch system measurements.
