Proto J4770-4M Hand Hex Bit Socket 1/4 in Drive 4 Mm

Product Description

The PROTO J4770-4M is a hand hex bit socket designed for precise hex fastener drive applications in mechanical, industrial, and trade service work. Built for use with a 1/4 inch drive, this socket accepts a 4 mm hex bit and delivers an overall length of 1.875 inches with a bit length of 1 inch. It is a compact, purpose-built socket suited for confined fastener locations where a standard hex key cannot be used with a ratchet or extension. Technicians across HVAC, electrical, plumbing, and mechanical service trades keep sockets like this in their drive sets for panel fasteners, equipment covers, and set screw applications.

The J4770-4M fits into any standard 1/4 inch drive ratchet, torque wrench, extension, or speed handle. Its short overall length makes it practical for tight-clearance fastener work on equipment enclosures, terminal blocks, fan assemblies, and similar hardware found in both residential and light commercial service environments. The 4 mm hex size targets metric fasteners common on imported equipment and components.

Key Features

• 1/4 inch drive interface fits standard ratchets, torque wrenches, and extensions
• 4 mm hex bit size for metric hex fastener applications
• 1 inch bit length provides solid fastener engagement
• 1.875 inch overall length suits tight-clearance service locations
• Compact form factor for inclusion in field drive socket sets

Compatibility

Designed as an OEM-style replacement and standard service socket for use with any 1/4 inch square drive tool, including ratchets, extensions, and torque wrenches accepting that drive size.

Installation Notes

No power down or lockout-tagout is required to use a hand socket, but standard safe fastener service practices apply. Ensure the drive tool and socket are fully seated before applying torque to avoid rounding the fastener or damaging the bit. Inspect the socket for cracks or wear before use in high-cycle or high-torque applications. Refer to equipment service documentation for fastener torque specifications.