The 3000 Forum

Hi, I’m attempting to restore my trunk to it’s original state and want to install a tire block to the left rear interior of my
trunk. It requires two machine screws. However, I am unsure of the length and if the screws are metric or witworth.
Any assistance would be most appreciated.

Moss: 332-280 bolt, 324-590 flat washer, 324-020 lock washer - 4 each required for the two blocks. (block is 221-640).

I don't have one off, but I'd guess 1/4-28 - as for length, 1/2-3/4" longer than the block.

Robert,

The two bolts are 1/4 UNF thread with a 7/16 head with a flat washer and a spring. They screw into 2 captive nuts on the boot/trunk wall but dont be surprised if the captive nuts have gone. If you car has been painted you may need to run a tap through them. I dont have a spare parts manual for a 3000 but i think they will be about 2.5inches long.

If you have a spare parts manual and you can give me the BMC part no for the bolts I can decode it for you and give you the exact length.

There are no whitworth or metric nuts, bolts or machine screws on a 3000. OK, maybe one whitworth screw on an SU carb .... but's all.

I have found this web site of great assistance if you don't have a BMC parts manual

https://lbcdigital.com/bmc_publications/akd3523/

The section you should look at is MP1.1 (road wheels) under the mechanical section.
The bolts are HBZ 0422 which equates to 1/4" by 2 3/4 " long. UNF thread

Regards,
Greg

HBZ0422 Bright Zinc Plated UNF 1/4 x 2 3/4