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 sponsors professional road and mountain-bike race 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 →