S-93791A552 1/4"-20 x 5/8" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws
Stainless Steel Hex Drive Flat Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Exceptional corrosion resistance with 18-8 stainless steel construction and black-oxide passivated finish, ideal for harsh industrial environments.
- Superior tensile strength rated at 70,000 psi ensures reliable performance under high-stress applications.
- Precision Class 3A thread fit guarantees secure, vibration-resistant fastening with minimal risk of loosening.
- Fully threaded UNC coarse spacing provides faster installation and enhanced grip in a variety of materials.
- 82° countersink angle and flat head design allows for a flush, clean finish, reducing snagging and improving safety.
- Hex drive compatibility (5/32") enables high-torque application with standard tools, speeding up assembly.
- Compliance with ASME B18.3, RoHS 3, and REACH ensures adherence to industry standards and environmental safety regulations.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these 1/4"-20 x 5/8" flat head screws combine 18-8 stainless steel with a black-oxide passivated finish to combat corrosion and extend service life in moisture-rich or chemically exposed areas. The fully threaded UNC coarse spacing and Class 3A fit deliver precise, vibration-resistant connections, critical for machinery, automotive assemblies, and structural frameworks where reliability is paramount. The 82° countersink and flat head profile ensure a seamless surface, minimizing protrusions in equipment and enclosures. Ideal for OEM and MRO applications, these screws address common challenges like fastener failure and installation inefficiency, providing a durable, standards-compliant solution that reduces maintenance downtime.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC thread with coarse spacing and Class 3A fit for high precision and strength. Dimensions include a head diameter of 0.531", length of 5/8", and hardness of Rockwell B55. It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.
