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NomadStudioBus
Samba Member
Joined: August 20, 2015
Posts: 69
Location: Seneca, SC
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 Posted: Fri Oct 09, 2020 7:52 am Post subject: Rear apron bolt mystery size |
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So I'm replacing the bolts for my rear apron and completely at a loss for the right size. I first ordered replacements from WW which are m8 1.25 and they're too large. So I bought m8 1.0 and still too large. I thought M7's (which are harder to find) should fit and they almost do, but they're slightly loose and don't tighten down. So I thought they thread size could be wrong but I can only find them in an m7 1.0. It's not 1/4 or 5/16 either. I have no idea what it could be. Are there any other possibilities? It's a 61 panel with og mounts as far as I can tell. Thanks for any help
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Lind
Samba Member
Joined: November 06, 2000
Posts: 9915
Location: idaho
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| Posted: Fri Oct 09, 2020 8:03 am Post subject: Re: Rear apron bolt mystery size |
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1950-1971 are all M8 (8x1.25) from the factory for German buses. 14mm heads through 1960ish and 13mm heads after that. You can use reduction box bolts if you want the right markings on the heads.
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Clara 
Samba Member
Joined: June 14, 2003
Posts: 12400
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| Posted: Fri Oct 09, 2020 8:46 am Post subject: Re: Rear apron bolt mystery size |
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have you tried chasing the threads?
Those bolts get dry and rusty; do apply grease/ oil/ anti-seize to the threads when installing them |
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Thompson2
Samba Member
Joined: June 06, 2018
Posts: 659
Location: Portland, OR
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| Posted: Fri Oct 09, 2020 9:05 am Post subject: Re: Rear apron bolt mystery size |
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| NomadStudioBus wrote: |
| m8 1.25 and they're too large. So I bought m8 1.0 and still too large. |
M8x1.25 and M8x1.0 are the same size, but different thread pitch (1.25 is coarse, 1.0 is fine)
I'd suggest, as Clara said, to chase the threads. Buy either a thread repair kit or just a small tap and die set. If you're just getting started on your bus, you'll use it... a lot. If you use a tap, be 100% sure you've got the right size/pitch for the hole you're cleaning up. Otherwise, you'll just be cutting new, incorrect threads. |
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NomadStudioBus
Samba Member
Joined: August 20, 2015
Posts: 69
Location: Seneca, SC
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| Posted: Sun Oct 11, 2020 3:51 pm Post subject: Re: Rear apron bolt mystery size |
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| Clara wrote: |
have you tried chasing the threads?
Those bolts get dry and rusty; do apply grease/ oil/ anti-seize to the threads when installing them |
I did and it worked. Took some time but there was a lot of rust in there. Thanks for the tip
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61 Swivel Seat Panel |
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NomadStudioBus
Samba Member
Joined: August 20, 2015
Posts: 69
Location: Seneca, SC
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| Posted: Sun Oct 11, 2020 3:53 pm Post subject: Re: Rear apron bolt mystery size |
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| Lind wrote: |
| 1950-1971 are all M8 (8x1.25) from the factory for German buses. 14mm heads through 1960ish and 13mm heads after that. You can use reduction box bolts if you want the right markings on the heads. |
Thank you, and after some cleaning and chasing the threads the replacement bolts fit
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