1/2" Japanese Ratchets Compared: 8 KTC & Ko-ken Models by Teeth, Length & Head
A 1/2" drive ratchet is the size for larger fasteners: wheel nuts, suspension bolts and machinery. This guide compares the eight 1/2" ratchet handles we carry from KTC and Ko-ken, using figures published by the makers or their distributors. Where we could not confirm a figure, the table says Not confirmed.
- Smallest swing arc for tight spots: Ko-ken Z-EAL 4725Z. Ko-ken USA lists 72 teeth and 5° per click.
- Published head size and weight: KTC BR4E (250 mm, 580 g, 18 mm head thickness).
- Maximum leverage: Ko-ken 4753P-410 (410 mm), Ko-ken 4749N-380 (380 mm) or KTC BR4L (375 mm).
- Simple 250 mm everyday ratchet: Ko-ken 4753N or 4749N-250 (24 teeth), or the 30-tooth Ko-ken 4750N.
The comparison table
All eight use a 1/2" (12.7 mm) square drive. Tap a model name to see its current price and details.
Ko-ken 4725Z Z-EAL Ratchet Handle, 1/2" (12.7 mm) Drive
KTC BR4E Ratchet Handle 36 teeth, 1/2" (12.7 mm) Drive
| Model | Gear teeth | Swing arc | Length | Weight | Head size |
|---|---|---|---|---|---|
| Ko-ken 4725Z (Z-EAL) | 72 | 5° | 253 mm | 590 g | W 36.5 mm × T Not confirmed* |
| KTC BR4E | 36 | 10° | 250 mm | 580 g | W 39.5 × T 18 mm |
| KTC BR4L | 36 | Not confirmed | 375 mm | 730 g | W 39.5 × T 18 mm |
| Ko-ken 4750N | 30 | Not confirmed | 250 mm | Not confirmed | Not confirmed |
| Ko-ken 4753N | 24 | Not confirmed | 250 mm | Not confirmed | Not confirmed |
| Ko-ken 4749N-250 | 24 | Not confirmed | 250 mm | Not confirmed | Not confirmed |
| Ko-ken 4749N-380 | 24 | Not confirmed | 380 mm | Not confirmed | Not confirmed |
| Ko-ken 4753P-410 | 24 | Not confirmed | 410 mm | Not confirmed | Not confirmed |
* Ko-ken USA and TRUSCO (a major Japanese tool distributor) both list the 4725Z with 72 teeth, a 253 mm length and a 36.5 mm head width. Ko-ken USA gives 5° per click; TRUSCO gives the 590 g weight. The two sources list different head thickness figures (18.2 mm and 32.8 mm), so we show it as not confirmed. Some older listings describe a 36-tooth 4725Z.
How to read these numbers
Gear teeth and swing arc. The swing arc is how far the handle must move before the ratchet catches the next tooth. A smaller arc helps where the handle can only move a little. KTC lists 10° for its 36-tooth BR4E. Ko-ken USA says its earlier 36-tooth ratchets moved 10° per click and the new 72-tooth Z-EAL ratchets move 5°.
Handle length. A longer handle gives more leverage for stubborn bolts but needs more room to swing. KTC warns that long handles make over-tightening easy, so use a torque wrench for final tightening where a torque value is specified.
Back-drag. Ko-ken USA describes low back-drag as one of Ko-ken's traditional strengths, and says it kept the spring pressure low when designing the 72-tooth ratchet. No maker publishes a comparable figure, so it is not in the table.
Model notes
Ko-ken Z-EAL 4725Z — 72 teeth, 253 mm, 590 g
Ko-ken's compact Z-EAL line in 1/2" drive. Ko-ken USA describes the 72-tooth version as using two pawls and having a 10% higher torque limit than its 36-tooth predecessor.
View Ko-ken 4725Z
KTC BR4E — 36 teeth, 250 mm, 580 g
KTC's standard 1/2" ratchet. KTC says its one-piece pawl design made the head 20% thinner than its previous models, and that supporting the gear with two pawl positions increased strength by 30%. A head repair kit (BR4E-K) is available.
View KTC BR4E
KTC BR4L — long, 375 mm
The long version: same head width and thickness as the BR4E, 375 mm long and 730 g. The BR4E-K repair kit also fits the BR4L.
View KTC BR4L
Ko-ken 4750N — 30 teeth, 250 mm
A 250 mm ratchet with a 30-tooth gear and a metal handle.
View Ko-ken 4750N
Ko-ken 4753N and 4749N-250 — 24 teeth, 250 mm
Two 250 mm, 24-tooth ratchets with metal handles. Ko-ken's 24-tooth ratchets use a two-pawl design.
View Ko-ken 4753N View Ko-ken 4749N-250
Ko-ken 4753P-410 and 4749N-380 — long handles
The 4753P-410 (410 mm, polished handle) is the longest model here, followed by the 4749N-380 (380 mm, metal handle). Both have 24-tooth gears.
View Ko-ken 4753P-410 View Ko-ken 4749N-380Which one should you buy?
Working in a tight engine bay? Start with the Ko-ken 4725Z, which has the smallest published swing arc here.
Want published dimensions to check clearance? The KTC BR4E and BR4L list head width, thickness and weight.
Breaking loose stubborn bolts? Choose a long handle: the Ko-ken 4753P-410, 4749N-380 or KTC BR4L.
Need one general-purpose 1/2" ratchet? A 250 mm model such as the Ko-ken 4753N, 4749N-250 or 4750N is a sensible start.
FAQ
Do these fit 1/2" sockets from other brands?
Yes. 12.7 mm square drive is the metric name for 1/2" drive, so standard 1/2" sockets fit.
Can I use a ratchet with an impact wrench socket?
Yes, a 1/2" impact socket fits a 1/2" ratchet. Do not use a hand ratchet on an impact wrench.
Should I use a long ratchet to tighten wheel nuts?
Use it to run nuts on and to break them loose. For final tightening to a specified value, use a torque wrench. See our torque wrench buying guide.
Related guides
- 3/8" Japanese ratchets compared: 8 KTC and Ko-ken models
- KTC vs Ko-ken: which Japanese socket brand?
- Japanese ratchet tools for tight spaces
- 6 Japanese socket sets compared
Shipped directly from Japan
We ship genuine KTC and Ko-ken tools from Japan with tracking (Japan Post, FedEx or DHL). Tell us what you are working on, and we will help you choose a 1/2" ratchet.
Browse Japanese hand toolsSources
- Ko-ken USA: 4725Z (72 teeth, 5° per click, 253 mm, head width 36.5 mm, head height 18.2 mm, two pawls, torque limit, earlier 36-tooth models at 10°)
- TRUSCO Orange Book: 4725Z (72 teeth, 253 mm, head width 36.5 mm, head thickness 32.8 mm, 590 g)
- Freer Tool: 4725Z (listing describing a 36-tooth version)
- MISUMI: KTC BR4E (36 teeth, 10°, 250 mm, 580 g, head size, design notes)
- Joshin: KTC BR4E (cross-check of teeth, length, weight)
- MISUMI: KTC BR4L (36 teeth, 375 mm, 730 g, head size)
- MISUMI: KTC BR4E-K repair kit (fits BR4E and BR4L)
- Freer Tool (US Ko-ken distributor): 4753N, 4750N, 4749N-250, 4749N-380, 4753P-410 (teeth and length)
Specifications may change. Always confirm current specifications with the manufacturer for safety-critical work. Last reviewed: October 2026.
