S-95345A438 4-40 x 1/2" ASME B18.13 Stainless Steel Pan Head Phillips Screws with External-Tooth Lock Washer
Stainless Steel Pan Head Phillips Screws with External-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 external-tooth lock washer that maintains clamping force under dynamic loads
- Excellent corrosion protection through 18-8 stainless steel construction and passivated finish for extended service life
- Reliable fastening performance with 70,000 psi tensile strength ensuring maximum holding power in demanding applications
- Quick installation and removal with Phillips No. 1 drive and coarse UNC threads for efficient assembly operations
- Precise thread engagement through Class 2A thread fit that ensures consistent mating with standard components
- Full-length threading capability providing complete fastening coverage along the entire 1/2" length
- Comprehensive washer integration featuring 410 stainless steel external-tooth lock washer for immediate vibration resistance
Professional Applications & Engineering Value
These 4-40 UNC rounded head Phillips screws with lock washers deliver exceptional engineering value in applications where vibration-induced loosening compromises assembly integrity. The combination of 18-8 stainless steel construction and passivated finish provides superior corrosion resistance in harsh environments, while the integrated external-tooth lock washer bites into mating surfaces to prevent rotational movement. The coarse UNC threads and Class 2A fit ensure reliable engagement in various materials, making these screws ideal for electronic enclosures, machinery guards, and industrial equipment where vibration resistance and long-term reliability are critical. The fully threaded design maximizes contact area, distributing stress evenly for enhanced joint stability.
Specification Summary & Compliance
This fastener features precision 4-40 UNC coarse threads with Class 2A thread fit for consistent mating performance. Manufactured to ASME B18.13 specifications with 70,000 psi tensile strength, the screw assembly includes an integrated external-tooth lock washer manufactured from 410 stainless steel with passivated finish. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial applications.
