1121577 HNBR O-Ring fit Caterpillar
1121577 HNBR O-Ring fit Caterpillar
- New aftermarket part
- 30 day returns
- Manufacturer's warranty
1121577 HNBR O-Ring for Caterpillar Equipment
The 1121577 O-ring is a sealing ring used in fixed and certain moving connections of Caterpillar equipment. It is made from HNBR (hydrogenated nitrile) and has a nominal hardness of 78 Shore A. This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).
The part is identified by the Caterpillar equipment part number 112-1577 and corresponds to SAE AS568 dash size -228. The ring is supplied as an individual O-ring; no additional seals, installation tools, or other components are specified in the available product data.
Fitment
The 1121577 HNBR O-ring is listed for the following Caterpillar machine models and equipment types:
- Tracked bulldozer Caterpillar D10N
- Tracked bulldozer Caterpillar D10R
- Tracked bulldozer Caterpillar D9L
- Wheel loader Caterpillar 988KXE
Fitment should be checked against the machine model, serial number, and the sealing location before installation, because the same machine series may contain O-rings of different dimensions and materials.
Cross-reference numbers
| Part number | 1121577 |
| Also identified as | 112-1577 |
| SAE AS568 dash size | -228 |
The numbers 1121577 and 112-1577 refer to the same listed O-ring identification, with the hyphenated format used in the equipment part-number reference. The SAE AS568 designation identifies the dimensional size of the sealing ring and is not a separate equipment part number.
Specifications
| Part type | O-ring sealing ring |
| Equipment manufacturer | Caterpillar |
| Material | HNBR, hydrogenated nitrile rubber |
| Hardness | 78 Shore A |
| Nominal size | 228 |
| SAE AS568 size | -228 |
| Cross-section diameter | 0.14 in |
| Inside diameter | 2.23 in |
| Outside diameter | 2.512 in |
| Operating temperature range | -40 to 275 °F |
| Coating | None |
| Approximate weight | 0.1 lb |
| Length | 6.2 cm |
| Width | 6.2 cm |
| Depth | 0.3 cm |
| Supply configuration | Individual O-ring |
The sealing ring has a circular cross-section with a 0.14-inch cross-section diameter, a 2.23-inch inside diameter, and a 2.512-inch outside diameter. The listed temperature range is from -40 °F to 275 °F. The product data specifies that the ring has no coating.
Before fitting, compare the removed seal with the specified dimensions and confirm that the groove and mating components correspond to the required -228 size. The sealing surfaces and groove should be free of contamination or damage during installation. No separate installation lubricant or mounting procedure is included in the available specifications.
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