Holo-krome 770305020 M3x0.5 Hex Socket Cap Screw 20mm Ss

Product Description

The HOLO-KROME 770305020 is an M3 x 0.50 hex socket cap screw with a 20 mm length under head, manufactured from austenitic Grade A4 stainless steel with a bright uncoated finish. It is fully threaded along its entire shaft and accepts a hex (Allen) drive for installation. This fastener meets ISO 3506-1 and ISO 4762 standards, making it appropriate for precision mechanical assemblies, HVAC equipment panels, plumbing fixture brackets, electrical enclosures, and other applications where corrosion resistance and dimensional accuracy are required. Installation is performed by maintenance technicians, millwrights, and trade professionals working on equipment requiring metric fasteners.

This screw is suited for use in both residential and light commercial settings where metric hardware is specified. Common applications include securing access panels, mounting brackets, motor housings, and control components in HVAC systems, plumbing assemblies, and electrical enclosures. The Grade A4 stainless steel construction makes it appropriate for environments with exposure to moisture or mild chemicals. Sold in a minimum order quantity of 10 pieces, this fastener is stocked as a catalog item for ongoing maintenance and repair use.

Key Features

• M3 x 0.50 thread size with 20 mm length under head for precise dimensional fit
• Fully threaded shank provides maximum thread engagement in thin material applications
• Austenitic Grade A4 stainless steel offers strong corrosion resistance in wet or chemically exposed environments
• Bright uncoated finish maintains dimensional accuracy and allows torque verification
• Conforms to ISO 4762 (socket cap screw dimensions) and ISO 3506-1 (corrosion-resistant fastener materials)
• Hex socket drive allows installation in recessed or tight-clearance locations with a standard Allen wrench

Compatibility

Designed as an ISO-standard M3 x 0.50 metric hex socket cap screw for use in any application specifying an ISO 4762 socket cap screw in M3 x 0.50 thread pitch with 20 mm length under head.

Installation Notes

Installation requires a correctly sized metric hex (Allen) key or hex bit driver rated for the M3 socket. Power down or de-energize any equipment before replacing or installing fasteners on electrical or HVAC assemblies. Follow applicable equipment manufacturer torque guidelines and applicable codes such as the NEC for electrical enclosures or IFGC for HVAC equipment panels. Do not substitute an imperial hex key, as doing so risks rounding the socket drive recess.