Cummins BM55330 Piston, Internal Combustion Engine

Cummins BM55330 is a piston in Engine Parts, US catalog. Listed by US Government (DLA FLIS), October 2026.

Government data (US Government (DLA FLIS), October 2026 edition)

The U.S. government's Federal Logistics Information System (FLIS) records Cummins BM55330 as the maker's own number under government stock item NSN 2815-00-765-0798. The name and every fact below are FLIS's, credited to US Government (DLA FLIS), October 2026 edition.

Specifications recorded for government stock item NSN 2815-00-765-0798, under which this manufacturer's reference number is listed. Confirm compatibility and specifications with the manufacturer before ordering.

Government item name

Piston, Internal Combustion Engine

Government stock item (NSN)

2815-00-765-0798

Manufacturer code (CAGE)

15434, CUMMINS INC., COLUMBUS, IN, UNITED STATES

Furnished items

Pin and retaining ring groove

Overall height

4.940 in (nominal)

Diameter

4.125 in (nominal)

Oil passage type

Hole

Pinhole diameter

1.4960 in (nominal)

Surface finish

Finished

Finished size designation

Standard

Skirt type

Solid

Ring groove quantity

4

Ring groove width

• First ring: 0.0720 to 0.1240 in
• Fourth ring: 0.1875 in (nominal)
• Second ring: 0.0720 to 0.1240 in
• Third ring: 0.0720 to 0.1240 in

Groove taper angle

7 degree 30 minutes

Ring groove diameter

• First ring: 3.720 in (nominal)
• Fourth ring: 3.686 in (nominal)
• Second ring: 3.720 in (nominal)
• Third ring: 3.720 in (nominal)

Distance from pin hole center to extreme top

3.073 in (nominal)

Distance between pin bosses

1.760 in (nominal)

Pin type for which designed

Floating

Material

Aluminum alloy

Weight

48.0 oz

Source: US Government (DLA FLIS), October 2026 edition, a public U.S. government data release. This is not an official DLA record and may contain errors. Verify fitment before ordering. Not affiliated with or endorsed by the Defense Logistics Agency or the Department of Defense. SearchForPart does not show a price here.

About this kind of part (general, written by SearchForPart)

Moves in the cylinder and passes combustion force to the connecting rod. Replaced in a rebuild or after scoring, cracking or overheating. Check bore size, compression height and the engine rating.

When ordering, give the part number exactly as printed and its maker, and the make, model and year of the truck, trailer, reefer unit or machine (or the engine or unit serial number). SearchForPart shows fitment only as the source printed it: check it before you order.

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Source: US Government (DLA FLIS), October 2026 edition, a public U.S. government data release. This is not an official DLA record and may contain errors. Verify fitment before ordering. Not affiliated with or endorsed by the Defense Logistics Agency or the Department of Defense. SearchForPart does not show a price here.