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Lower fork bolt size #341869
11/07/10 1:32 pm
11/07/10 1:32 pm
Joined: Sep 2007
Posts: 101
Ohio
R
rmak Offline OP
BritBike Forum member
rmak  Offline OP
BritBike Forum member
R
Joined: Sep 2007
Posts: 101
Ohio
Dang, I just repaired one fork and then the other started to leak. This is on my 65 TR6. It's leaking from the bottom of the fork. I wish I would have cleaned and sealed the parts on both forks before I put the bike together.
I borrowed a small whitworth socket to take the first fork apart and clean. Now I forgot the socket size. I tried all of my standard and metric sockets and nothing is close. I want to buy one of these little sockets so I have it on hand. Does anyone know the size I need? The socket I need fits the small bolt that is exposed right on the bottom of the lower fork slider after you remove the wheel. I have a whitworth socket set, but the bolt is smaller than my smallest one.
Thanks.

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Re: Lower fork bolt size [Re: rmak] #341894
11/07/10 3:44 pm
11/07/10 3:44 pm
Joined: Jun 2002
Posts: 9,879
Scotland
S
Stuart Offline
BritBike Forum member
Stuart  Offline
BritBike Forum member
S
Joined: Jun 2002
Posts: 9,879
Scotland
Hi,

Originally Posted By: rmak
fits the small bolt that is exposed right on the bottom of the lower fork slider after you remove the wheel.
I want to buy one of these little sockets
I borrowed a small whitworth socket

Just so we're clear:-

. Whitworth is an actual threadform with particular hex. AF's corresponding to particular thread nominal diameters.

. The fork threads will almost certainly be Cycle (aka CEI and BSC); Cycle nuts 'n' bolts are also referred to by thread nominal diameter rather than hex. AF's, and use the same hex. AF's as Whitworth, but Cycle usually uses one size smaller hex. AF than the same diameter Whitworth (e.g. 5/16" Cycle - 0.52"AF, 5/16" Whitworth = 0.6"AF). A point to bear in mind if sockets are actually marked "Whitworth" (or "BSW").

Then, just to be even more confusing, iirc that bolt is 'small hex.' - i.e. although its thread nominal diameter is 5/16" Cycle, the hex AF is what'd normally be found on a 1/4" Cycle - 0.445"AF. Or, if you've tried that, it could be the next one down - 0.324"AF.

Confused? Jolly good. grin

Fwiw, the first socket set I ever bought, that still helps me out occasionally, instead of having markings for Olde Englishe sizes, has a few sockets marked xx/32"AF; however, 'til I started fiddling with Olde Englishe clunkers, I never knew what they were for. So when you go searching for a socket to own, bear in mind 11/32" for 0.324", 15/32" for 0.445" or 17/32" for 0.52".

Hth.

Regards,

Re: Lower fork bolt size [Re: Stuart] #341952
11/07/10 7:43 pm
11/07/10 7:43 pm
Joined: Sep 2007
Posts: 101
Ohio
R
rmak Offline OP
BritBike Forum member
rmak  Offline OP
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R
Joined: Sep 2007
Posts: 101
Ohio
This is why I love this forum....OK, regardless of what you want to call them, does anyone know the socket size I need to get that bolt out of the bottom of the lower fork leg on a dry frame?

Re: Lower fork bolt size [Re: rmak] #342043
11/08/10 2:30 am
11/08/10 2:30 am
Joined: Jun 2007
Posts: 5,848
Maui Hawaii
HawaiianTiger Offline

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HawaiianTiger  Offline

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Joined: Jun 2007
Posts: 5,848
Maui Hawaii
I don't know which size yours is but I just looked in my tool box and found one socket that is 5/16 and another that is 17/32 both are ground down around the outside to fit in that too small hole.
Bill


Bikes
1974 Commando
1985 Honda Nighthawk 650
1957 Thunderbird/T110 "Flying Tiger"
Antique Fans: Loads of Emersons (Two six wingers) plus gyros and orbiters.
Re: Lower fork bolt size [Re: rmak] #342052
11/08/10 3:22 am
11/08/10 3:22 am
Joined: Nov 2008
Posts: 148
Oregon
M-Runner Offline
BritBike Forum member
M-Runner  Offline
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Joined: Nov 2008
Posts: 148
Oregon
If your small restrictor bolt hex is the same stock size as a 66' you can use a DEEP 8mm 12 point socket, the one I use is a Snap-On, it's fairly thin and fits into the cavity of those lower bolts on my bikes (66,67,68,69) perfectly.

Tom

Re: Lower fork bolt size [Re: rmak] #342222
11/08/10 11:44 pm
11/08/10 11:44 pm
Joined: Sep 2007
Posts: 1,596
Shingle Springs, California
Roadwarrior Offline

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Roadwarrior  Offline

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Joined: Sep 2007
Posts: 1,596
Shingle Springs, California
I use an 8mm 12pt also, that is skinned down on the outside due to the tight clearance. I use a small o-ring under the head that is available at any hardware store. I kept loosing the socket also until I put it in it's own marked plastic bag.


Bob


73 Triumph T140 Main Ride
70 Bonnie
67 BSA West Coast Hornet

56 Chevy

Who are the brain police?



Re: Lower fork bolt size [Re: Roadwarrior] #342226
11/09/10 12:03 am
11/09/10 12:03 am
Joined: Jun 2002
Posts: 9,879
Scotland
S
Stuart Offline
BritBike Forum member
Stuart  Offline
BritBike Forum member
S
Joined: Jun 2002
Posts: 9,879
Scotland
Hi,

Originally Posted By: HawaiianTiger
5/16

Originally Posted By: M-Runner
8mm

Originally Posted By: Roadwarrior
8mm

... suggest that the nominal AF should be 0.324" (normally 2BA and 3/16" Cycle/BSF). 5/16"AF and 8mmAF often can be too small (0.3125" and 0.315" respectively), but old bolts could be slightly smaller now and Snap-On scokets, particularly, grip the flats rather than the corners, so could have enough clearance.

Bill: I suspect 17/32"AF might've been 'ground down' to fit restricted access on something bigger? wink

Hth.

Regards,


Moderated by  John Healy 


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