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PROTO Impact Socket: 1/2 in Drive Size, Metric, 21 mm Socket Size, 6-Point, Std - 1/2" Drive Impact Sockets
PROTO1/2" Drive Impact Sockets

PROTO Impact Socket: 1/2 in Drive Size, Metric, 21 mm Socket Size, 6-Point, Std

The PROTO J7421M is a 1/2" Drive Impact Socket with a 21 mm metric socket size and a 6-point standard configuration. It features a Black Oxide finish and has an overall length of 1 5/8 inches. This industrial socket…

SKU 3G-OTH-298554

Brand
PROTO
Item
Impact Socket: 1/2 in Drive Size, Metric, 21 mm Socket Size, 6-Point, Std
Category
1/2" Drive Impact Sockets
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Technical Specifications

PROTO
Manufacturer Part Number
J7421M
Type
Metric, 6-Point, Std
Overall Lg
1 5/8 in
Socket Size
21 mm
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Technical Documents

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PROTO Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The PROTO J7421M is a 1/2" Drive Impact Socket with a 21 mm metric socket size and a 6-point standard configuration. It features a Black Oxide finish and has an overall length of 1 5/8 inches. This industrial socket is designed for use with impact tools.

Frequently Asked Questions

What is the PROTO J7421M impact socket used for?

The PROTO J7421M is a 1/2" drive impact socket designed for heavy-duty fastening with impact tools. Its 21 mm metric, 6-point configuration suits industrial maintenance, automotive repair, and assembly applications where high torque and durability are required.

What are the specifications of the PROTO J7421M impact socket?

The PROTO J7421M has a 1/2" drive size, 21 mm metric socket size, 6-point standard profile, and 1 5/8 in overall length. It features a Black Oxide finish for corrosion resistance and is designed for use with impact tools.

Where to buy PROTO J7421M impact socket worldwide?

3G Electric supplies the PROTO J7421M impact socket worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your facility. Contact us to order this genuine PROTO part for your operations.

How to select the right impact socket size for a fastener?

Match the socket size exactly to the fastener head dimension—here 21 mm for a 21 mm bolt. Ensure the drive size (1/2") fits your impact wrench. A 6-point design provides better grip and reduces rounding on hex fasteners compared to 12-point.

Used in

Common applications for PROTO
Automotive assembly — PROTO J72102 impact socket set for fastening lug nuts on production lines
Heavy equipment maintenance — PROTO J3772T flare nut wrench for hydraulic line fittings on excavators
General industrial repair — PROTO J795SA adjustable wrench set for tightening bolts on conveyor systems
Aerospace manufacturing — PROTO J5240A slotted bit socket for adjusting fasteners in confined spaces
Oil and gas pipeline work — PROTO J5438 12-point socket for valve assembly in refineries
Construction site toolkits — PROTO J8179-T500 double box wrench for structural steel bolting

PROTO Products

3G Electric supplies PROTO 1/2" drive impact sockets. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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