Headlamp bezel screw thread size?

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Jeremy
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#1 Headlamp bezel screw thread size?

Post by Jeremy » Fri Jun 15, 2018 4:38 pm

Help please. I'm fitting the headlamp glass covers and the threads of the captive nuts in the bonnet for the chrome bezel screws need cleaning out. I can't work out what size tap I need. My thread gauge indicates it is 32 TPI. I've tried UNF 10-32 but that's too fat. Doesn't look like 2BA either (also too fat). Might it be 5/32 Whitworth?
Many thanks,
Jeremy
1967 S1 4.2 FHC in slowly converging bits

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Gfhug
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#2 Re: Headlamp bezel screw thread size?

Post by Gfhug » Fri Jun 15, 2018 5:11 pm

UNC 8-32 perhaps? Sorry can't tell you for certain, but if 10 is too fat the 8 UNC is 32 tpi.

Geoff
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#3 Re: Headlamp bezel screw thread size?

Post by Jeremy » Fri Jun 15, 2018 6:17 pm

Thanks Geoff. Anybody else know for certain?
Jeremy
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chrisfell
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#4 Re: Headlamp bezel screw thread size?

Post by chrisfell » Fri Jun 15, 2018 6:23 pm

5/32 x 32
Chris '67 S1 2+2

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#5 Re: Headlamp bezel screw thread size?

Post by Jeremy » Fri Jun 15, 2018 7:39 pm

Is that BSW Chris?
Jeremy
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neal herridge
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#6 Re: Headlamp bezel screw thread size?

Post by neal herridge » Mon Jun 18, 2018 5:27 pm

Hi Jeremy.
They are 8 UNC.
Neal.

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Series1 Stu
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#7 Re: Headlamp bezel screw thread size?

Post by Series1 Stu » Tue Jun 19, 2018 3:54 pm

There is no such thing as a 5/32 Whitworth fastener and certainly no Whitworth fasteners with 32 tpi.

BSF has a 32 tpi but that is 3/16" only. BSF are not common in automotive applications.

It certainly won't be an American thread or a metric thread so that leaves good old Unified.

Choices at 32 tpi are 6-32 UNC, 8-32 UNC & 10-32 UNF.

10-32 UNF is about 3/16" dia. 8-32UNC is a little over 5/32" dia. & 6-32 UNC is an oversize 1/8" dia.

We really shouldn't guess at sizes in an effort to assist others.

As Neal said, 8-32 UNC is the likely size but the dimensions I've just given you should enable you to decide for yourself.

Regards
Stuart

If you can't make it work, make it complicated!

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#8 Re: Headlamp bezel screw thread size?

Post by Julian.P » Tue Jun 19, 2018 6:55 pm

Thread size is 8/32 UNC.
Regards, Julian.

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#9 Re: Headlamp bezel screw thread size?

Post by Jeremy » Tue Jun 19, 2018 7:51 pm

Many thanks all for your assistance. I will get me an 8/32 unc tap.
Jeremy
1967 S1 4.2 FHC in slowly converging bits

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