TC 55x78x12mm Rubber Covered Double Lip Oil Seal NBR Crankshaft

This aftermarket TC rubber covered double lip oil seal measures 55mm inner diameter, 78mm outer diameter and 12mm in height, manufactured in black NBR nitrile rubber. The steel reinforcing cage is fully encapsulated in rubber, with a primary sealing lip, an integrated secondary dust lip and a garter spring maintaining uniform radial pressure on the shaft.

Importers, wholesalers, auto repair shops and MRO buyers can submit RFQ with dimension, quantity, destination and working medium for a formal quotation. Standard production Lead Time is 7–15 days.

Features & Benefits

Fully rubber-covered outer diameter absorbs housing bore irregularities and provides reliable static sealing in aluminum engine housings where a bare metal case could leak.
Double lip design with a garter spring maintains consistent contact pressure on the crankshaft; the primary lip retains engine oil while the secondary lip blocks dust and road contamination.
Black NBR nitrile rubber delivers dependable oil resistance and wear resistance, compatible with engine oils, gear greases and standard hydraulic fluids.
The garter spring compensates for normal lip wear and minor crankshaft run-out, helping maintain sealing performance over the engine service interval.
Standard 55x78x12mm dimensions match common metric TC crankshaft front seal housings used across passenger and light commercial engines.
This is an aftermarket replacement seal, not a genuine OEM part. Always verify shaft diameter, housing bore and application before ordering.

• MOQ：Depends on spec; typically 100–5,000 pcs. Lead Time: 7–15 days. This SKU quantity confirmed on quotation.
  Factory standard options are available for marking and packaging; confirm all requirements on RFQ.

Material & Process

• Sealing lip：NBR (nitrile butadiene rubber), black
• Reinforcement：steel cage fully encapsulated in rubber
• Spring：carbon steel garter spring
  Continuous working temperature: -30°C to +100°C; short-term peak up to +120°C. Confirm compound grade with RFQ for high-temperature or special fluid applications.
  Compatible fluids: engine oil, gear oil, lithium grease, standard hydraulic fluids

Applications & Compatibility

Commonly listed as crankshaft front oil seal for automotive and light diesel engines; also used in gearboxes, differentials, industrial gearboxes, pumps and motors. Application context commonly listed for this size — verify before order.
Aftermarket replacement. Verify shaft diameter, housing bore and OE number before order.

Selection & Installation

Selection Tips

Confirm crankshaft ID 55mm, housing bore 78mm and seal height 12mm. Match the NBR material to your engine oil type and operating temperature range.

Installation Steps

1. Thoroughly clean the crankshaft and housing bore; remove all burrs, old seal residue, rust and contamination.
2. Lightly lubricate the sealing lip and crankshaft with engine oil. Do not install dry.
3. Press the seal evenly into the housing using a proper installation tool, keeping it perfectly perpendicular to the bore.
4. Do not strike the rubber lip or hammer directly on the seal. Avoid cocking or distorting it during installation.
5. After assembly, rotate the crankshaft by hand to check for binding, then inspect for oil leakage during the initial test run.

Packaging & Delivery

Standard packaging: neutral polybag per piece, packed in export cartons. Typically 50–200 pcs per carton, adjustable on request.

• Lead Time：7–15 days for this standard spec. MOQ: Depends on spec; typically 100–5,000 pcs; this SKU quantity confirmed on quotation.
  Samples and small trial lots are available for stocked sizes; sample freight confirmed on RFQ.
  Send an inquiry with size (ID×OD×height in mm), quantity, destination country and duty for a firm lead time.