S-91781A572 1/4"-20 x 4" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws
Stainless Steel Slotted Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 stainless steel and passivated finish for extended service life in harsh environments
- High tensile strength of 80,000 psi ensures reliable fastening under heavy loads and vibration
- Precise Class 2A thread fit guarantees smooth assembly and consistent clamping force
- Standard 82° countersink angle allows for flush mounting and clean aesthetic finish
- Partially threaded design provides optimal grip on materials while reducing installation time
- Compliance with ASME B18.6.3 ensures dimensional accuracy and interchangeability
- RoHS 3 and REACH compliance meets environmental regulations for global industrial use
Professional Applications & Engineering Value
This 1/4"-20 UNC flat head screw delivers exceptional engineering value for industrial applications requiring reliable, corrosion-resistant fastening. The 18-8 stainless steel construction with passivated finish provides superior protection against rust and chemical exposure, making it ideal for machinery, marine equipment, and food processing applications. The coarse UNC thread and Class 2A thread fit ensure quick installation and secure holding power in various materials. With its standard 82° countersink angle and slotted drive, this screw offers flush mounting capabilities while maintaining accessibility for maintenance. The partially threaded design concentrates clamping force where needed most, preventing material damage while providing vibration resistance in demanding environments.
Specification Summary & Compliance
This 4" flat head screw features 1/4"-20 UNC coarse threads with Class 2A thread fit for precise dimensional tolerance. Manufactured to ASME B18.6.3 specifications, it ensures consistent quality and interchangeability. The screw maintains Rockwell B80 hardness and achieves 80,000 psi tensile strength for durable performance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental responsibility and suitability for regulated industries.
