What Type of Screws fit '74 Front Guard Stays

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thunderbolt

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Hi guys,

I am fitting a new stainless front mudguard to my '74 Commando. My original guard that is being replaced had 4 x cross head (phillips) screws holding both front and rear stays to the guard. When I look up Andover and RGM under the Part # it shows and states hex head screws.

Does anyone know what screws were original in 1974?

Thanks
Don
 
Mr. Rick said:
My 74 had (and still has) hex head.
Click to expand...

Hi Rick, do you mean allen head screws or the normal six sided headed bolt. Is there a washer of any type under the bolt/screw head?
Thanks
Don
 
thunderbolt said:
Mr. Rick said:
My 74 had (and still has) hex head.
Click to expand...

Hi Rick, do you mean allen head screws or the normal six sided headed bolt. Is there a washer of any type under the bolt/screw head?
Thanks
Don
Click to expand...


He means external hex, I assume most would use the term "socket" for an allen head.
Same plain washer either side of the fender (plus spring washer and nut on the inside, of course).
 
thunderbolt said:
Does anyone know what screws were original in 1974?
Click to expand...

My 74 850 project had what should have been the original and slightly rusty hex head little bolts still fitted.
My local AN Norton Dealer produced identical looking little nuts and bolts, don't recall if they came in the green globe bags. They are a whisker shorter than 1/2", and quite a small thread size, and nice and shiny.

Don't recall if there were washers - I don't think so, they'd have to be slightly curved ?
Haven't fitted them yet, will watch with interest.
 
Just as NorComCycles says.
4 each bolt, nut, and "serrated" washer, plus 8 each plain washers.
Nuts and bolts are 5/16" across the flats. The original nuts want to go rusty, but the bolts are still shiny! With raised letters that I cannot make out, even with magnification.
 
AN shows bolts for stays to guard to be UNC. Was this as original?
 
I found some 10-32 stainless bolts at a marine supply in Florida. Was nearly 9 bucks by the time I got them shipped, but they look almost as good as chrome and match the stainless fender very well.
 
I used stainless button head screws, Allen head type. Sourced at a local hardware store. Use stainless washer both side of the fender and nyloc nuts. Probably would have been better to use chrome on my chrome fenders, but stainless is perfect for 850 fenders.
 
The original fender stay screws on my 1974 Commando were a posidriv pan head 10-32 x 1 inch long screw. According to the Mark II/IIA parts book supplement Norton changed that screw part number to 06-5222. I'm not sure if this part number is a hex or pan headed screw. Norton made a lot of little changes on the motorcycle during 1974 and of course the parts book wouldn't reflect these changes. If it's any help my bike was built in June of 1974.

Posidriv screws look very similar to a Phillips head screw however, you should use a posidriv screwdriver to prevent damage to the posidriv screw head. British Tools and Fasteners sells stainless versions of that type of screw.
http://britishfasteners.com/index.php/screws/stainless-steel-screws/stainless-unf-screws.html

As for me I replaced my screws with stainless pan headed Phillips screws. They are easier to find, cheaper and don't look that much different than posidriv.


Peter Joe
 
PeterJoe said:
The original fender stay screws on my 1974 Commando were a posidriv pan head 10-32 x 1 inch long screw. According to the Mark II/IIA parts book supplement Norton changed that screw part number to 06-5222. I'm not sure if this part number is a hex or pan headed screw.
Click to expand...

06-5222 is Pozi-panhead according to AN:
https://andover-norton.co.uk/en/shop-details/16469
What Type of Screws fit '74 Front Guard Stays



According to Baxter Cycle 06-5222 was (3/16") 10-32 x 9/16"
http://baxtercycleparts.com/index.php?m ... s_id=11398

For 850 Mk3 it appears they went back to using 06-0677.
 
thunderbolt said:
Hi guys,

I am fitting a new stainless front mudguard to my '74 Commando. My original guard that is being replaced had 4 x cross head (phillips) screws holding both front and rear stays to the guard. When I look up Andover and RGM under the Part # it shows and states hex head screws.

Does anyone know what screws were original in 1974?

Thanks
Don
Click to expand...

Mine came with Phillips head screws, bought it new in 76.
John in Texas
 
Rohan said:
PeterJoe said:
a posidriv pan head 10-32 x 1 inch long screw.
Click to expand...

Inch long would have a fair bit of spare length hanging down inside the guard. ?
Click to expand...

I can't believe I wrote 1 inch!
It is 9/16 inch long. My replacement screw happens to be 5/8 inch long which works fine. Of course I added a thin stainless washer to the head of the screw.

Peter Joe
 
I tend to not use plated fasteners. The ones on my bike that are not titanium are hi-tensile steel with an overspray of matt black paint on their heads to slow the rust. Plated fasteners can fail due to hydrogen embrittlement after they have been tensioned up for even long periods of time. I'd never use plated bolts to hold disc callipers. With stainless steel fasteners, I would not use them in critical places - that material can do funny things such as work harden because of vibration and even titanium has it's problems. If you leave a bracket loose on a titanium fastener, the reduction in dimension due to vibration in a short time can be amazing.
 
Nortons used satin chromed/dull chromed/matt chrome nuts and bolts on bikes for decades,
after using bright nickel for some decades before that.
And cad plate on dommies and then Commandos for some while too.

(I'm not sure I have ever seen a broken one either.)

So plated fasteners have a somewhat proven record on Nortons ......
 
Rocky Point Cycle offers many choices of fastener head style all in stainless for fender stay to fender; similarly for fender brace to slider and fender stay to slider.
 
Thanks guys for all the replies. I am co0nfident the phillips types screws on my front guard are the originals and thanks for the Part # for the '74 year part.

I will look around for stainless screws of this type to match the stainless front guard purchased from RGM Motors.

Thanks again.
Don
 
thunderbolt said:
I am confident the phillips types screws on my front guard are the originals
Click to expand...

Whats your engine number ?
Phillips head type stuff didn't appear until the Mk 3. (?).
Suspicion being they were running short of stuff towards the end...
 
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