Ratchet Wrench 3/8"

The 3/8" drive ratchet is the working bench's most-used socket tool. Bottom-bracket sockets, cassette lockring tools, the suspension top-cap socket, the BSA bottom-bracket cup wrench; most of the bike-specific socket inventory accepts a 3/8" square drive. A working shop that owns one ratchet first owns a 3/8" before adding the 1/2" or 1/4" later.

The 3/8" Ratchet Wrench has 75 pawls and a 4.8° engagement angle. The 4.8° matters in close quarters: in a tight space where you can only swing the handle 10° at a time, a coarse-engagement ratchet (with 8–10° per click) leaves you wondering whether the next click will engage in time. The 75-pawl mechanism clicks twice per 10° swing, which keeps the work moving without lost motion.

The body is drop-forged chrome-vanadium, machined to spec, chrome plated, and assembled in the same forging-and-finishing line that produces the rest of Unior's ratchet family. The 200 mm handle length gives the leverage most bicycle-mechanic work calls for; for jobs that need heavier leverage (pedal removal at full breakaway torque), the 1/2" version is the right choice.

What the 3/8" handles

• Bottom bracket cup install at manufacturer-spec torque (paired with a 16-notch or 8-notch BB socket)
• Cassette lockring removal (paired with a Shimano/SRAM-pattern lockring tool, with the chain whip on the cassette)
• Suspension top-cap socket use (with the aluminum-anodized top cap socket)
• Hub axle nut work on quick-release and through-axle hubs where the nut is 15–22 mm

For smaller fasteners and bit-socket work, switch to the 1/4" ratchet. For heavier-torque work, the 1/2" ratchet.

Specs

• 3/8" square drive
• 75 pawls, 4.8° engagement angle
• 200 mm handle
• Drop-forged chrome-vanadium body
• Chrome plated
• Double-component handle (hard core for torque, soft outer for grip)
• Article number: 190.1/1ABI-US (3/8" variant)

Built in Zreče, Slovenia

Unior has been forging hand tools in Zreče since 1919, and is the official technical partner of multiple World Tour and downhill teams. The 190.1 ratchet line is forged in Zreče from chrome-vanadium blanks, machined to spec on-site, chrome plated through Unior's own finishing process, and assembled in the same facility. Most ratchet brands assemble in the same country; few forge, machine, finish, and assemble at a single location.

Pro tip from our mechanics

The single best diagnostic for a worn ratchet: hold it in one hand and slow-spin the head in the engagement direction. A clean ratchet feels smooth; a worn one catches and skips. The 75-pawl mechanism in the 190.1 holds smooth through years of working-shop use because the pawls have enough engagement area to share the load. Our workshop hand tools guide covers ratchets and the rest of the workshop tool layer: Workshop hand tools every bike shop needs →