One base, the whole top of the ladder
Everything on the J800 nose runs through this casting. Above it, five different points; below it, the bucket lip; between them, one pin and one retainer. That makes the base the part that decides how the whole set behaves — and the part that is hardest to correct once it is welded on.
The J800 system sits at the top of the Cat J-series, above J700. In Black Cat's adapter table it is the only rung listed at a 4.00 in strap, against the Cat 994 wheel loader; TRASTEEL prints its J800 two-strap standard weld-on row for 385 / 390 class buckets. Same base in both cases, and the same two hardware numbers.
What fits on the 6I-8804
| Point | Profile | Weight as published | Printed size |
|---|---|---|---|
| 6I-8803 | loader casting | 104 kg (TRASTEEL) | — |
| 135-9800 | loader rock penetration HD | 100 kg (TRASTEEL) · 202.4 lb / 91.81 kg (Black Cat) | 565 × 250 mm |
| TSJ-800-LHD | loader profile, Cat alternative 135-9800 | 99 kg (TRASTEEL) | 580 × 240 × 150 mm |
| TSJ-800-PHD | excavator penetration, Cat alternative 6I-8802RC | 77 kg (TRASTEEL) | 590 × 240 × 135 mm |
| TSJ-800-V | excavator tiger | 62 kg (TRASTEEL) | 620 × 242 mm |
The weight range on one base is 62 kg to 104 kg. Because they all take the same pin, a buyer who orders "J800 teeth" without a profile will usually be quoted the loader casting, which is the heaviest of the five and the wrong shape for an excavator that wants breakout force rather than face impact.
Centre and RH/LH are two castings
| Casting | Position | Weight | Pin / retainer |
|---|---|---|---|
| 6I-8804 | centre | 209.2 lb / 94.89 kg (Black Cat) · 112 kg (TRASTEEL) | 102-0101 / 101-2874 |
| 6I-8804 RH/LH | right or left hand | 232.1 lb / 105.28 kg (Black Cat) | 102-0101 / 101-2874 |
The RH/LH casting is 10.39 kg heavier than the centre one. Corner base positions carry side load as well as breakout force, so they are built thicker — and they are handed. Mixing them across a lip is not a safety problem in itself, but it puts the tooth line out of alignment and the first set of points wears unevenly, which usually gets blamed on the teeth.
The 17 kg question
Between the two catalogues we cross-reference, the centre base is published as 112 kg and as 94.89 kg. Both cross-reference the same Caterpillar number, so one of the two is a different casting, a different measuring convention, or a figure carried forward from an older print. The catalogue cannot tell you which, and at this weight it is not a rounding detail:
| Item | TRASTEEL | Black Cat 215.1025 | Gap |
|---|---|---|---|
| 6I-8804 (centre) | 112 kg | 209.2 lb / 94.89 kg | 17.11 kg |
| 135-9800 (loader tip on this base) | 100 kg | 202.4 lb / 91.81 kg | 8.19 kg |
On 100 bases the gap is 1,711 kg; on 100 tips, 819 kg. That is the difference between one truck load and two, and it has to be settled before freight is quoted, not after. We do it by weight: send the kilo weight of the casting you are replacing and we confirm which publication figure your machine takes.
One catalogue row to read before ordering pins
TRASTEEL's two-strap standard weld-on table prints 9U-9616 (113-4708) — a J700 pin number — on its J800 row for 385 / 390 class buckets, with the 101-2874 retainer. Black Cat's J800 pin block prints 102-0101 for the same series, and the heavy duty J800 row in TRASTEEL's own loader table prints 102-0101 with 134-1808 as the alternative. Read together, the two-strap rows appear to be indexed differently from the heavy duty rows. It does not make the pins interchangeable: pull the old pin, read the number on it, and if there is no number, send diameter and length in millimetres.
What to measure before you weld one on
A point that does not fit is a boxed part and a phone call. A base that does not fit is a bucket cut open. Four measurements cover it: the nose opening across the pocket, the pin bore diameter, the lip thickness where the base is welded, and the position — centre or corner. Add a photograph of the base still in the bucket with the old point on it, and the quote comes back with the matching points, pins and retainers attached to the same line.
FAQ
Q: What tooth does the Cat 6I-8804 adapter take?
A: The J800 family — 6I-8803 loader casting (104 kg), 135-9800 loader rock penetration HD (100 kg TRASTEEL / 202.4 lb / 91.81 kg Black Cat), TSJ-800-LHD (99 kg), TSJ-800-PHD (77 kg) and TSJ-800-V (62 kg) — all on pin 102-0101 (134-1808) with retainer 101-2874 (134-1809).
Q: How much does a 6I-8804 base weigh?
A: 112 kg in TRASTEEL; 209.2 lb / 94.89 kg for the centre casting and 232.1 lb / 105.28 kg for the RH/LH casting in Black Cat. That 17.11 kg gap is 1,711 kg on a 100-piece order, so the base is confirmed against the weight you are replacing.
Q: Is the centre casting the same as the RH/LH?
A: No. Same family number, different casting — the RH/LH is 10.39 kg heavier and handed for the corner positions.
Q: Which machines take the 6I-8804?
A: Cat 994 wheel loader, on a 4.00 in strap according to Black Cat's adapter table, and 385 / 390 class buckets in TRASTEEL's two-strap row. Before ordering hardware off that two-strap row, check the old pin number — see the note above.
Sources
Adapter, point, pin and retainer numbers, published weights and printed sizes: COHIDREX TRASTEEL TSJ catalogue (millimetres and kilograms) and Black Cat Wear Parts "Cat J Series Teeth & Adapters" catalogue 215.1025 (pounds, converted at 1 lb = 0.45359237 kg). Strap thickness and machine family: Black Cat's J-series adapter table. Both are third-party aftermarket catalogues; Caterpillar and the part numbers are the property of their respective owners.