Holo-krome 78058 Hex Socket Cap Screw 1/4-20 Unc

Product Description

The HOLO-KROME 78058 is a hex socket cap screw designed for secure mechanical fastening in applications requiring corrosion-resistant hardware. Manufactured from 18-8 stainless steel with a bright, uncoated finish, this screw carries a 1/4-20 UNC thread and a 3/4 inch length under head. It is fully threaded from tip to head, providing maximum thread engagement across the full grip length. The 3/16 inch hex drive is engaged with a standard hex key or Allen driver. This fastener meets ASME B18.3 and ASTM F837 standards, making it suitable for use in assemblies where dimensional consistency and material traceability are required by specification.

This fastener is appropriate for light-to-medium mechanical assemblies across industrial, HVAC, plumbing, and equipment maintenance applications. Its 1/4-20 UNC thread is one of the most common coarse-thread fastener sizes in North American trade work, appearing in equipment panels, brackets, pump housings, valve assemblies, and structural hardware. The stainless steel construction makes it a practical choice for installations with moisture exposure, chemical contact, or outdoor service conditions where carbon steel fasteners would corrode.

Key Features

• 1/4-20 UNC coarse thread for broad compatibility with standard threaded holes and inserts
• Fully threaded body maximizes thread engagement over the 3/4 inch under-head length
• 18-8 stainless steel construction provides corrosion resistance in wet or chemically active environments
• Bright uncoated finish maintains dimensional accuracy and avoids coating interference in tight-tolerance fits
• Meets ASME B18.3 and ASTM F837 standards for dimensional and material conformance
• 3/16 inch hex socket drive for use with standard Allen keys or hex bit drivers

Compatibility

Designed as a standard 1/4-20 UNC hex socket cap screw suitable for any application requiring an ASME B18.3-compliant fastener with a 3/4 inch under-head length and 18-8 stainless steel material.

Installation Notes

Installation requires a 3/16 inch hex key or Allen bit driver. Ensure the mating threaded hole or insert is clean and free of debris before driving. Apply appropriate thread lubricant or anti-seize compound when fastening into dissimilar metals to prevent galling, which is common with stainless steel fasteners. Do not over-torque; stainless steel fasteners are susceptible to galling and thread seizure if driven beyond their rated torque range without lubrication.