Original BMW M5 Hex Nut for Third Brake Light, BMW 128i, 135i, 135is, and 1 Series M (2008–2013)

The Original BMW M5 hex nut is a small metric fastener that BMW uses on the E82 and E88 1 Series, and PMB offers it for securing the third brake light on the 128i, 135i, 135is, and 1 Series M. BMW calls it simply "hex nut," and it takes a 5 mm metric thread. Each nut weighs only 2 grams and is sold individually, so you can order exactly the count your job needs. This nut is made in Denmark. A hex nut threads onto a stud or screw and clamps a part in place, and the six flats let you turn it with a standard socket or wrench.

Original BMW Parts carry a 24-month parts warranty.

The current number entered production in September 2006. It replaced the earlier BMW number 63-25-1-371-401, and BMW rates the new nut as a full replacement for the old one in every application, so it can go on cars that left the factory with the earlier part. Other numbers that refer to this same nut include 63-21-0-141-231 and 07-13-0-024-161. This nut is part of BMW's wider hardware range and shows up on many BMW models from several decades, which is why the same small part is called for across the whole 1 Series range covered here.

Technical Details

• Manufacturer: BMW
• Part number: 63-25-9-128-043
• BMW part name: hex nut
• Thread size: M5
• Weight: 2 g (0.07 oz) each
• Production start: September 2006
• Replaces: 63-25-1-371-401
• Country of manufacture: Denmark
• Sold as: one piece
• Warranty: 24-month parts warranty on Original BMW Parts

Common Questions

Will this nut replace the older BMW number on my car?
Yes. BMW rates this nut as a direct replacement for 63-25-1-371-401 on any car that used the older part.

Do I get more than one nut per order?
No. Each order line is one nut, so set the quantity to match the number you need.

Fitment & Compatibility

Use the fitment table below to confirm the exact year, make, model, submodel, and any application notes before ordering. Send your VIN and PMB Performance will confirm the fit, drawing on more than 20 years in the trade.