Author Topic: Headlamp Rim Screws  (Read 3356 times)

Offline Mike_Berkshire

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Headlamp Rim Screws
« on: July 01, 2024, 01:28:50 PM »
Hi, can anyone tell me what thread size the 3 screws are that go through the bucket and into the threaded tabs in the chrome rim? I don’t see thread details in the parts book. The diameter seems to be between m4 and m5. Many thanks.

Offline McCabe-Thiele (Ted)

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Re: Headlamp Rim Screws
« Reply #1 on: July 01, 2024, 02:42:21 PM »
They are a standard metric thread as I used some small Allen Key headed ones on my 500 that I had in a box of mixed metric ones - I suspect they are M5 but not 100% sure. I assume you mean the three that secure the headlamp rim & internals to the bowl.


Update parts book shows them as M5 x 16 mm this is confirmed in the middle section of the part number as well as the downloadable parts book p/n 93500-0516-0B the little spacers are not cheap..
« Last Edit: July 01, 2024, 04:57:17 PM by McCabe-Thiele (Ted) »
Honda CB400NA Superdream (current money puddle)
Honda CB500 K1 (second money pit)
https://www.sohc.co.uk/index.php/topic,28541.0.html
Honda CB400 four super sport (first money pit)
Link to my full restoration http://www.sohc.co.uk/index.php/topic,23291.0.html
This is a neat 500 restoration in the USA.
http://forums.sohc4.net/index.php/topic,151576.msg1731556.html#msg1731556

Offline SteveW

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Re: Headlamp Rim Screws
« Reply #2 on: July 01, 2024, 04:19:01 PM »
Pretty sure they are M5.
Only time I’ve come across M4.5 threads was for the vesa mount on my old Samsung TV.
My Lambretta has some M7 bolts if I remember correctly.
1974 CB550 K0 (with a 650 cam)
1980 CB650
2000 CBR929RR Fireblade
1966 Lambretta LI150 Series 3
1981 RD350LC
1972 Raleigh Chopper
1974 Raleigh Tomahawk
2011 Henry Hoover

Offline mickwinf

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Re: Headlamp Rim Screws
« Reply #3 on: July 01, 2024, 06:17:48 PM »
Nurse Julie sells them
Love the 500 and 550 have a 500 called Lazarus under restoration

Offline Mike_Berkshire

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Re: Headlamp Rim Screws
« Reply #4 on: July 01, 2024, 06:56:04 PM »
Thanks guys. Must be m5. I’ll get some m5s. Mike

Offline Mike_Berkshire

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Re: Headlamp Rim Screws
« Reply #5 on: July 02, 2024, 06:40:36 AM »

Update parts book shows them as M5 x 16 mm this is confirmed in the middle section of the part number as well as the downloadable parts book p/n 93500-0516-0B the little spacers are not cheap..

I hadn’t thought about the spacers Ted; well pointed out. I guess the plastic bucket will crack without these. I’ll have a root around in the removed screws bag and see if I have them, I don’t recall seeing these when stripping down unfortunately.

Offline DomP

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Re: Headlamp Rim Screws
« Reply #6 on: July 02, 2024, 08:12:09 AM »
The spacers are quite expensive so I bought m5 aluminium bushes from ebay ant ised a stainless washer to make up the tophat shape
1975 XS650B
1976 CB550F1 current project
2012 Triumph Daytona 675

Offline Mike_Berkshire

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Re: Headlamp Rim Screws
« Reply #7 on: July 02, 2024, 12:55:53 PM »
Great suggestion Dom. EBay here I come.

Offline DomP

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1975 XS650B
1976 CB550F1 current project
2012 Triumph Daytona 675