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Genuine BMW
BMW Part Number64 12 1 379 221

Expanding nut

ST 6.3 · one of 14 types

Out of stock

One email when it is listed. Nothing else.

Free US shipping on orders over $75.00 · oversize quoted. Oversize items ship at a flat $49.99 each — free shipping does not cover them.

WARNING: Cancer and Reproductive Harm from exposure to lead — www.P65Warnings.ca.gov P65Warnings.ca.gov

Inspected and graded before it's listed · 30-day returns

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Fits E36 316g–M3 & more · E46 316i–M3 & more 1990–2005

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Other types · 14 in all

All 13 other types
Expanding nut – BMW diagram

Callout 09 on BMW’s drawing “EMISSION CONTROL-AIR PUMP”. Open the drawing →

Also shown on EXPANSION TANK/TUBING, MECHANICAL CONNECTION ELEMENTS, MECHANICAL CONNECTION ELEMENTS and 2 more.

Sold in these kits

Expanding nut — a genuine BMW part, number 64 12 1 379 221. You will find it under AC & Climate Control (Other Heater and Air Conditioning parts). It supersedes the older number 61 66 1 371 324, so a part carrying that number is the same part.

Fits E36 318i, 318ti, 320i, 323i and 325i (1992–1999) with the M40, M42, M43, M44, M50 or M52 engines.

BMW draws it on 86 drawings, among them Emission Control-Air Pump and Expansion Tank/Tubing. It also comes in BMW kit Installing set catalyzer (11 76 1 716 468).

Out of stock. Request it and we will notify you when it is in stock.

Details

EnginesM40, M42, M43, M44, M50, M52

Used parts are inspected and graded: Good (minimal wear), Fair (normal wear) or Acceptable (visible wear). All fully working. Returns: 30 days if a part arrives damaged or not as described.

BMW has renumbered this part. All of these numbers are the same part.

  • 64 12 1 379 221currentOut of stock
  • 61 66 1 371 324replaced by 64 12 1 379 221

The other parts on BMW’s drawing “EMISSION CONTROL-AIR PUMP”. Open the drawing →

#PartIn stockAction
01Air pumpOut of stockRequest
02Mounting boltOut of stockRequest
03Pressure hose assyOut of stockRequest
04ValveOut of stockRequest
05Gasket Asbestos FreeOut of stockRequest
06Hex nut with plateOut of stockRequest
07BracketOut of stockRequest
08Rubber grommetOut of stockRequest
09Expanding nut · this partOut of stock
10Screw, self tappingOut of stockRequest
CompactM43ManualCH11
SedanM52AutomaticCB85

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InAC & Climate ControlOther Heater and Air Conditioning parts