Most WA380 tooth enquiries we get are written from an excavator habit: one tooth number, one pin, one retainer, thirty of each. On this loader that order comes back wrong twice — once because the corners are a different casting and handed, and once because there is nothing to pin. The numbers below are what the replacement catalogues in our files print for the 423 series, with the places they disagree with each other left visible instead of averaged away.
The WA380 tooth is bolted, not pinned
The 423 series is the bolted monoblock line — Komatsu calls it a unitooth, and the aftermarket lists call it a monoblock tip. The tooth is one casting with a socket that seats over the lip nose and bolt holes through the side; it is fastened with bolts, not driven on and locked with a pin. That single fact changes what has to be on the quotation: no pin, no retainer, and a bolt count that belongs to the tooth number rather than to the machine.
It also changes the wear story. A pin-on tooth can be re-shimmed against a worn nose; a bolted monoblock cannot. Once the socket opens, the tooth walks on the base and the bolts lose preload — and then a corner tooth is in the tyre channel. When a customer says his WA380 "eats teeth", the question is not the steel grade but whether the bases were checked when the last set went on.
Centre tooth: 423-70-13114
423-70-13114 is the centre number, and every aftermarket list prints it. What they do not do is agree on the weight. Five catalogues, five figures, one of them contradicting itself between its own pages:
| Catalogue | Printed weight | What else the row prints |
|---|---|---|
| BDI Wear Parts | 17.50 kg | WA380M, three-hole monoblock |
| HCE Parts | 17.50 kg | WA380-1 / WA380-3, bolt 09218-12219, nut 01643-32260, three bolts |
| Siderwin | 16.70 kg | 38 mm version, WA380M |
| AzuLong | 17.20 kg (37.9 lbs) | Quarry and aggregate loading, HRC 48–52 |
| SJ-GET | 17.0 kg spec block / 17.6 kg own table | Listed against WA380, WA420 and WA450 in the same row |
A 0.9 kg spread is 5 percent on one tooth — 27 kg on a thirty-piece order, and real money on air freight. It matters more as a signal: the castings are not identical, so the number is not a specification. We weigh each lot before packing and put the weighed figure on the packing list; if you are booking freight, ask for that figure rather than the catalogue number.
The corners are handed — 423-70-13144 and 423-70-13154
Corners are not centre teeth with another casting number: they are wider, heavier and set at the bucket's rake angle, in a left and a right. Two catalogues print the handedness explicitly, one as LH/RH and one as BL/BR:
| Position | Number | Printed weight | Bolts | Machines as printed |
|---|---|---|---|---|
| Left corner | 423-70-13144 | 22.7 kg (BDI) · 23.6 kg (SJ-GET) · 24.0 kg (HCE) | 4 | WA380 / 450 BL (BDI); WA420-3, WA470-3 (HCE) |
| Right corner | 423-70-13154 | 22.7 kg (BDI) · 23.6 kg (SJ-GET) · 24.0 kg (HCE) | 4 | WA380-1/-3/-5/-6/-7, WA420-1/-3, WA430-5/-6, WA470-1/-3/-5/-6, WA480-5/-6 |
Two of the same number will fit one side only. It is the most common corner error on this machine, and not a factory fault: the numbers are one digit apart (…144 and …154) and most lists print both at the same weight, so a buyer scanning by weight sees a matched pair. The serial ranges printed for 423-70-13154 stop at WA380-7 — on a later dash number, send the serial and a photo of the corner.
The base: 423-847-1111, and when it is weld-on instead
Not every WA380 lip carries a cast nose. On buckets where the nose has been rebuilt or was never cast in, the tooth bolts to a replaceable base. Two base styles are printed for this class:
| Base | Type | Printed weight | Machines as printed |
|---|---|---|---|
| 423-847-1111 | Bolt-on, three holes, centre | 15.0 kg in two catalogue tables; one supplier's spec block prints 13 kg for the same number | 538, 542, 545, WA350, WA380, WA380Z, WA400, WA420, WA430, WA450, WA470, WA480 |
| 423-847-1211 | Two-strap weld-on | 12.80 kg | WA380-38 and up, listed across WA380 / 400 / 420 / 450 / 470 |
The difference is not cosmetic. A bolt-on base is a field replacement — unbolt, bolt on. A two-strap weld-on base is welded to the lip: the lip must be sound enough to take the weld, and once it is on, the bolt pattern is fixed for the life of the lip. The choice is the state of the lip, not the price of the base. Send a side photo of the lip edge and the old base.
The bolts nobody puts on the quotation
The bolt is the cheapest line on a tooth order and the one that stops a machine. The catalogue table prints bolt 09218-12219 with nut 01643-32260 against the centre tooth, three bolts per tooth, and four per corner tooth on the same table. Those counts follow the hole pattern in the casting, so a corner tooth ordered with three bolts arrives short by one — and a corner tooth fitted with three bolts instead of four is the one that comes off first.
We quote bolts and nuts on the same line as the castings. When comparing suppliers, check whether the other quotation includes them: a tooth 40 cents cheaper without bolts is not cheaper.
Numbers that look like this one, and are not
| Number | What it actually is | Printed weight |
|---|---|---|
| 423-70-13114 | WA380 centre monoblock, three holes — the subject of this page | 16.7–17.6 kg across catalogues |
| 419-70-13114 | WA300 / WA320 centre monoblock, two holes | 12.80 kg |
| 423-70-13113 | Heavier centre tooth published against WA350 / 400 / 420 / 450 | 20.50 kg |
| 419-70-13113 | WA300 / WA320, 35 mm version | 12.70 kg |
The 419-against-423 prefix is one digit and four kilos; the 13113-against-13114 suffix is one digit and a different casting. The quickest check is the hole count on the socket — two on the WA300 / WA320 tooth, three on the WA380.
How to order a WA380 tooth set without a second shipment
- Give the machine and the serial. The printed coverage runs WA380-1 through WA380-7; a later machine is a separate check, not an assumption.
- Count by position, not by total. Centres are 423-70-13114; corners are 423-70-13144 left and 423-70-13154 right. A five-tooth lip is not five of the same number.
- State the base. Cast nose, 3-hole bolt-on 423-847-1111, or weld-on 423-847-1211. The tooth price does not change, the fit does.
- Take bolts and nuts on the same line. 09218-12219 with 01643-32260, three per centre and four per corner.
- Ask for the weighed figure if the order is going by air. The catalogue spread on the centre tooth is 0.9 kg a piece.
FAQ
Q: Which bucket teeth does a Komatsu WA380 take?
A: Centre 423-70-13114, left corner 423-70-13144, right corner 423-70-13154, and — where the lip takes a replaceable base — the three-hole bolt-on adapter 423-847-1111. All of them are bolted monoblock teeth.
Q: Does a WA380 tooth use a pin and retainer?
A: No. These are bolted castings: three bolts through the centre tooth, four through each corner. If your bucket has a pin-on nose, it is a different lip — send a photo, we will not guess.
Q: Are the two corner teeth interchangeable?
A: No. 423-70-13144 is the left corner and 423-70-13154 the right, printed at the same weight, which is exactly why they get ordered as two of one number. Read the number stamped on the old tooth, not the weight.
Q: Why does the centre tooth weigh 16.7 kg in one list and 17.5 kg in another?
A: Different aftermarket castings, and in one case two pages of the same supplier. We publish the spread, weigh each lot and quote freight on the weighed weight.
Sources
Numbers, weights, bolt pairs, bolt counts, base types and machine coverage come from five aftermarket catalogues and parts lists read in October 2026 — BDI Wear Parts, HCE Parts, Siderwin, AzuLong and SJ-GET — plus a Komatsu parts retailer's fitment list for 423-70-13154. Komatsu and the part numbers referenced are the property of their respective owners and are used for fitment reference only. No Komatsu genuine catalogue page for these numbers is in our hands, so nothing here is presented as genuine-parts data. Where the lists print different weights for the same number, every figure is shown and none is averaged.