Tritan 25B30H 3/8 MPB Sprocket collectible

Precision Power-Transmission Sprocket

This TRITAN 25B30H sprocket is a steel chainwheel built for single-strand 25 pitch roller chain. Its plain 3/8 in bore and 30-tooth profile suit low-speed drives, conveyor sections and light-duty machinery where a compact, hardened tooth form is required. The black-oxide finish adds corrosion resistance without changing critical dimensions. Hobbyists and maintenance teams use it to replace worn sprockets on packaging equipment, small conveyors and test rigs.

Build Integration

The one-sided hub measures 1 1/2 in diameter with a .515 in projection, leaving the opposite face flat for flush mounting against a shaft shoulder or spacer. A 5/8 in length through bore provides full keyway engagement when the user machines their own slot, while the absence of factory set screws avoids interference with custom locking methods. Pitch diameter of 2.392 in and outside diameter of 2.529 in determine chain wrap and centre-distance calculations. Maximum bore capacity of 1 in allows future re-boring if shaft sizes change.

Durability and Running Characteristics

Heat-treated steel teeth and black-oxide coating reduce wear and galling during continuous operation. Plain bore construction eliminates rolling-element bearings, so the only friction is the shaft-to-bore interface that the installer lubricates. No internal seals or lubricant reservoirs mean no leakage risk and no maintenance intervals beyond periodic chain tension checks. The sprocket runs cool under typical loads because all transmitted power goes into chain tension rather than bearing losses.