Original BMW Crankshaft Pulley Hub Bolt for BMW 1, 3, 5, and 7 Series, X3, X5, X6, and Z4 (2006–2016)

Original BMW crankshaft pulley hub bolt 11-21-1-439-395 is the center bolt that clamps the pulley hub to the nose of the crankshaft on N51, N52, N53, and N54 six-cylinder BMW engines in 2006–2016 models. BMW calls it a hex bolt and gives its weight as 243 g. It is an M16x80 fastener in grade 12.9 steel, made in Germany. The bolt is one-time use and must be replaced after every removal, so any job that takes the hub off the crankshaft needs a new bolt ready before reassembly. BMW production of this number began in September 2004.

Original BMW Parts carry a 24-month parts warranty.

The crankshaft hub carries the vibration damper and the accessory drive pulley, and the clamping force of this one bolt is what holds the hub in place on the crank. The same number serves the naturally aspirated N52 and N52N, the N51, the direct-injection N53, and the twin-turbo N54 and N54T, so a single bolt covers most of this inline-six family. BMW's parts data places it in the E82 and E88 1 Series, the E90, E91, E92, and E93 3 Series, the E60 and E61 5 Series, the F01 and F02 7 Series, the E70 X5, the E71 X6, the E83 and F25 X3, and the E85, E86, and E89 Z4. It is sold individually, one bolt per order.

Technical Details

• Manufacturer: BMW (Original BMW Parts)
• Part number: 11-21-1-439-395
• BMW name: hex bolt, crankshaft pulley hub
• Thread and length: M16x80
• Strength grade: 12.9
• Weight: 243 g (0.5 lb)
• Production start: September 2004
• Made in Germany
• Sold as: single bolt
• Warranty: 24 months

Installation & Tuning Notes

Lightly oil the threads before installation. Tighten to a joining torque of 100 Nm (about 74 ft-lb), then turn a further 360 degrees.

Common Questions

Can I reuse the old hub bolt?
No. This bolt is one-time use and must be replaced after each removal.

What is the tightening spec?
100 Nm (about 74 ft-lb) with lightly oiled threads, followed by a 360-degree torque angle.

Does it fit the turbocharged N54 cars?
Yes. The 135i, 335i, 535i, 740i, X6 xDrive35i, Z4 sDrive35i, and 1 Series M all use this bolt.

Fitment & Compatibility

Compare your production year and trim against the table below. Send your VIN and PMB Performance will confirm the fit, drawing on more than 20 years in the trade.