How to choose a socket ratchet set for your workshop

Which drive size do you need?

The drive size is the square that connects ratchet and socket. The common ones are 1/4 inch (6.3 mm), 3/8 inch (10 mm) and 1/2 inch (12.7 mm). A larger drive transmits more torque but makes the tool bulkier in tight spots.

For electronics, bicycles and fine assembly, 1/4 inch is enough. 3/8 inch is the all-rounder for car and motorcycle work, while 1/2 inch handles suspension, wheel nuts and anything high-torque. If you only buy one set, 3/8 inch is the most flexible choice.

What does the ratchet tooth count mean?

The tooth count is how many locking points the ratchet head has per revolution. From it comes the swing arc: the smallest angle you have to swing the ratchet back before it engages again. A smaller angle means you can work in tighter spaces.

• 36 teeth: 10° swing arc, robust and cheap for rough work.
• 72 teeth: 5° swing arc, the proven workshop standard.
• 90 teeth: 4° swing arc, ideal on very tight fasteners.
• A reversing lever for quick direction changes is a must.
• Fine-tooth heads take less shock load - never overload them with a cheater bar.

Also check for a clean reversing lever, a ball detent or quick-release for the sockets and an ergonomic handle. A good ratchet engages with a distinct click and no play.

6-point or 12-point socket?

The internal profile decides how force hits the fastener head. 6-point grips the flats of the bolt and transmits high torque safely. 12-point has twice as many engagement points and fits every 30°, which is handier but more delicate.

• Use deep sockets for threaded studs that stick out.
• Chrome-vanadium steel is standard for hand sockets, chrome-molybdenum for impact sockets.
• Never replace impact sockets (black, thick-walled) with chromed hand sockets.

Frequently asked questions