Author Topic: Triumph what size spanners ?  (Read 1016 times)

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Offline jimson

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Triumph what size spanners ?
« on: April 13, 2016, 09:05:39 PM »
G'day viewers, I'm trying to do some work on my, shed find triumph Bonnieville T140 but I'm having difficulties finding the right spanner size it's not metric or imperial it's somewhere in between ? Any guidance would be appreciated. Thanks Jimson
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Offline 80-85 husky

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Re: Triumph what size spanners ?
« Reply #1 on: April 13, 2016, 09:10:35 PM »
they will be BS .. british standard...

Offline LWC82PE

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Re: Triumph what size spanners ?
« Reply #2 on: April 13, 2016, 09:18:53 PM »
I work on these all the time so i can tell you they are SAE not BS/witworth. Thats what they should be anyway. They are not your Mitre 10 hardware store witworth sizes.  Older Triumphs with BSF and BSCY threads will use BS/witworth size spanners but by the time the T140 was around everything should be SAE with UNF and UNC (into alloy) threads. Some of the 1/4 bolts you can use 7/16 SAE or 1/4 BS hex size spanners though, but the 5/16 inch bolts should be SAE 1/2 hex and the 3/8 bolts are 9/16 SAE
« Last Edit: April 13, 2016, 09:24:20 PM by LWC82PE »
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Offline jimson

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Re: Triumph what size spanners ?
« Reply #3 on: April 13, 2016, 09:26:08 PM »
I'm a simple bloke & you blokes have just confused me even more lol. Jimson
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Offline Butcher

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Re: Triumph what size spanners ?
« Reply #4 on: April 13, 2016, 09:42:26 PM »
just when you have the correct spanner,the f#@#ING bolts are wrong......

Offline LWC82PE

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Re: Triumph what size spanners ?
« Reply #5 on: April 13, 2016, 09:42:42 PM »
Just to clarify that, the actual fastener hex size should suit the imperial spanners you can easily buy. Its the actual imperial bolts from the hardware store that are harder to get spanners for. They have UNC/WIT threads but the average home DIY does not have the correct BS/wit spanners for the hex sizes those bolts have, so most resort to using metric on them. So if the common imperial spanners you can get from a hardware/auto store do not fit the fasteners then it most likely means many of the fasteners are not correct and have been changed because the T140 should have SAE hex sizes (same as what you would use on a Harley)  and use common available SAE spanners. Many of the bolts that screw into alloy can be interchanged from UNC to WIT but the hex sizes change so i suspect that's probably what has been done in some places.  There was a cross over where some british bikes had mixtures of SAE and BS but that was earlier. Some of the smaller less than 1/4 fasteners might still be BA or UNEF (UN extra fine) threads so keep that in mind if any threads smaller than 1/4 need any sort of attention but 99% should be UNF or UNC threads on those models.
« Last Edit: April 13, 2016, 09:54:27 PM by LWC82PE »
Wanted - 1978 TS185 frame or frame&motor. Frame # TS1852-24007 up to TS1852-39022