The right-hand casting, and why its weight differs from the left
423-70-13154 is named TOOTH, R.H. in the Komatsu parts catalogue and printed at 24.0 kg, against 23.4 kg for its left-hand partner 423-70-13144. Half a kilo is not a rounding difference in a catalogue that carries four-figure weights to one decimal place — it is two different castings, machined separately, and the right-hand one is the heavier of the pair. Most aftermarket lists flatten the distinction and print both corners at the same figure, which is convenient for a price list and misleading for anyone comparing weights to identify a tooth.
Both corners are bolted monoblocks: four fasteners through the side of the corner nose, no pin bore, no retainer, no shims. If the tooth on the machine has a pin and a rubber or steel retainer, it is not this part and the lip is a different system.
Fitment printed by serial number
The most useful thing an aftermarket fitment list gives a buyer is the serial break, because Komatsu changed the bucket between series and a model name is not enough. The list below is reproduced from an aftermarket (OIM) catalogue entry for 423-70-13154, read in October 2026. European and overseas-build variants share the number but not always the serial band, so both are shown where the source prints both.
| Model | Serial range as printed | Note on the row |
|---|---|---|
| WA380-1 | 10001-UP | Also WA380-1LC from A45001-UP |
| WA380-3 | 16338-UP | Overseas version 50001-52999 and 53001-UP; WA380-3L from A50001-UP |
| WA380-5 | 60001-UP | Including -5-SN and -5-TN; overseas version same band |
| WA380-6 | 65001-65948 and 65949-UP | Split at the ecot3 engine change |
| WA380-7 | 10001-UP | Last WA380 series on this aftermarket list |
| WA420-1 | 10001-UP | WA420-1LC from A25001-UP |
| WA420-3 | 15055-UP | Overseas version 50001-52999 and 53001-UP; WA420-3L from A30001-UP |
| WA430-5 | 60001-UP | Including -5-SN |
| WA430-6 | 65001-65500 and 65501-UP | ecot3; separate EU and North America rows |
| WA470-1 | 10001-UP | Malaysia / Cassis spec from A30501-UP |
| WA470-3 | 25233-UP | Overseas version 50001-52999 and 53001-UP |
| WA470-5 | 70001-UP | Overseas version same band |
| WA470-6 | 85001-90215 and 90216-UP | ecot3 |
| WA480-5 | 80001-UP | Overseas version same band |
| WA480-6 | 85001-90215 and 90216-UP | ecot3 |
Two names are missing from that table for a reason: WA380-8 and WA470-7/-8. The aftermarket list stops at WA380-7, while Komatsu's own consumable tooth list prints 423-70-13154 against WA380-5, -6, -7 and -8 and against WA470-5 through -8. On those machines the part is the same and the list simply has not been extended — but we ask for the serial anyway, because a bucket that has been rebuilt or swapped in from another machine is the case where a catalogue row is least useful and a photo is most useful.
The mistake that comes back as a return
Corners get ordered in pairs and then arrive wrong in one specific way: two of the same number. On paper the two castings look like a matched set — the same size, nearly the same weight, the same four bolt holes — and in a photograph taken from the front they are mirror images that a buyer can easily mistake for duplicates. Fit a second right-hand tooth on the left side and it either will not seat or, worse, seats with the wear face angled inboard and starts wearing through the bucket side plate.
The check we run before packing is simple: one casting must carry the L.H. number and one the R.H. number, and the flank profiles must mirror. If a customer orders "two corner teeth" without positions, we ask, because guessing right is a coin flip and guessing wrong ships metal that cannot be used.
What 22.7 to 25.3 kg costs in freight
The published weights for this casting run from 22.7 kg (BDI), through 23.0 kg (YF), 23.6 kg (SJ-GET and Beneparts) and 24.0 kg (Komatsu catalogue and HCE), to 25.3 kg on a Komatsu aftermarket table. On forty pieces that is 908 kg at the light end and 1,012 kg at the heavy end — a hundred kilos, which is the difference between two freight bands on most air and consolidated sea quotes. We weigh the lot and print the weighed figure on the packing list, so the number that gets declared is the number that was on the scale.
Ordering
To quote this corner we need the machine model with serial number, the number off the old tooth if it is still readable, a side photograph of the corner with something for scale, and the quantity split by position. Corners are not sold as a round number of one part number; a set is one left plus one right plus whatever centres the lip carries — the full WA380 set is written out in the WA380 tooth guide, and the left-versus-right question in more detail in the corner teeth guide.
FAQ
Q: What is the Komatsu 423-70-13154?
A: The right-hand corner tooth of the 423 series bolted monoblock bucket, TOOTH, R.H. in the parts catalogue, printed at 24.0 kg. Four bolts, no pin.
Q: Which serial numbers does it cover?
A: Aftermarket lists print it from WA380-1 S/N 10001-UP to WA380-7 S/N 10001-UP, plus WA420-1/-3, WA430-5/-6, WA470-1/-3/-5/-6 and WA480-5/-6 with their own breaks. Komatsu's consumable list adds WA380-8.
Q: Can I use two of them on one bucket?
A: No. One left-hand 423-70-13144 and one right-hand 423-70-13154. The castings are handed.
Q: Is this the same as 423-847-1140?
A: No. 423-847-1140 is a chip-type tooth held by pin 09244-02516 on a pinned base. This is a bolted monoblock and needs side bolt holes on the corner nose.
Sources
Part name, catalogue weights and machine rows come from the Komatsu parts catalogue entry for 423-70-13154 and from Komatsu's consumable tooth and edge parts list, plus aftermarket listings from BDI Wear Parts, HCE Parts, SJ-GET, Beneparts, YF Wear Parts and a Komatsu aftermarket table printing 25.3 kg; the serial-range table is reproduced from an OIM aftermarket catalogue entry, all read in October 2026. Figures are as printed, and where catalogues disagree every value is shown rather than averaged. Komatsu and the referenced part numbers belong to their respective owners and appear here for fitment reference only. No price is published — these are quotation items.