HD 10mm 12pt Caliper Bolts - Spline Sockets?

[HapHazard]

I've been making progress (slow & unsteady, as usual) with the 2000 Softail Standard.
The fork boots are both split(), and I need to remove the caliper so I can drop the left fork leg.
HD affixes the caliper with dicey looking 10mm 12 point bolts. All my 10mm sockets are 6 point, and my 10mm wrenches are short and don't give me nearly the leverage to loosen the bolts (even using the scarey "larger wrench looped over the end" trick) which are supposedly torqued to 38 ft lbs (and frozen into the aluminum caliper).
So I need to get a 12 point metric socket. Our Asian friends have a set of conventional 12 point "Pittsburg Pro" sockets, and these "spline sockets" which they say work on 4, 6, and 12 point fasteners and "deliver more torque than standard sockets".

http://www.harborfreight.com/7-piece...set-96362.html

Any experience/recommendations/tips on loosening these bolts that seem hellishly tight?

Thanx!

[D.T.]

Not sure if it's a special bolt or just a 12 PT. Did you try a stardard 10mm 12 PT socket? Good excuse to buy more tools for the shop I'd say.

I just bought a 12 pt eight mm socket for my valve adjusment on the Vstrom. It's easier to tighten and loosen in tight spots where you can't move the wrench much.

[anotherguy]

Cheap 10MM 12PT socket,a heat gun and penetrating oil with a large dose of patience. If you screw up the mounting bolts it will get very ugly fast.

[spafxer]

I bet they're External Torx bolt heads.... not 12 points.

http://www.sears.com/craftsman-7-pc-...p-00934570000P

Many manufacturers use them in some places...



Never have seen a spline socket before.... INTERESTING




.

[ttpete]

12 point and spline drive heads are used on many ultra high tensile strength fasteners because they are stronger and more secure when torquing to the high values they require.

[bikeridermark]

Sears should have it. I bought the one to remove the brake pads there.

[HapHazard]

The gen-yoo-wine HD shop manual (as well as anotherguy) says they are 10mm 12 point. This is them:



I DID find a cheap 10mm socket - part of the plastic boxed metric socket set I bought in 1969 with my paperboy money. It's as toothless as a 20 year old cat. I saw the spline sockets and wondered if they'd do better than a 12 point - the Internets seem to disagree if they are wonderful or worse than this:



Anotherguy, where do I apply the heat gun - the body of the caliper? I was thinking of heating the head of the bolt with my small butane torch, then waiting and hitting the head with a shot of freon spray to shrink it.

[col klink]

Yep, as stated above all you need is a decent 12pt 10mm socket, and leverage.
It is definitely not an external torx.
Twist on it! They'll pop loose.

[spafxer]

Yep, that's a 12 point bolt head... I forgot E Torx only have 6 points.

and you've got a major rust problem going on there. Look at the brake line banjo bolt in the backround!

Looks like that bike's been at the beach...



.

[HapHazard]

Originally Posted by spafxer

Yep, that's a 12 point bolt head... I forgot E Torx only have 6 points.

and you've got a major rust problem going on there. Look at the brake line banjo bolt in the backround!

Looks like that bike's been at the beach....

Oh no - not the beach, it was in a leaky barn, with actual cows, for like 8 years. Dirt, hay, rust and motor frozen.

I'll post some before (and hopefully after) pics when I get closer to done.

[speedracertdi]

I have a craftsman 12pt, 10mm i keep just for this bolt. Like others have said, thats all you need.

[oldxr]

Snap-on makes some heavy duty black impact gun sockets for 10mm 12 point.Sometimes you have to go for the good stuff.I have been a mechanic for 30 years and I dont buy tools at harbor freight.

[anotherguy]

You got it-apply heat to the caliper body where the bolt is. But hit it with the penetrating oil first and let it soak. It'll come loose so fast and hard it'll click the ratchet to the opposite direction.

[ttpete]

Originally Posted by HapHazard

The gen-yoo-wine HD shop manual (as well as anotherguy) says they are 10mm 12 point. This is them:



I DID find a cheap 10mm socket - part of the plastic boxed metric socket set I bought in 1969 with my paperboy money. It's as toothless as a 20 year old cat. I saw the spline sockets and wondered if they'd do better than a 12 point - the Internets seem to disagree if they are wonderful or worse than this:



Anotherguy, where do I apply the heat gun - the body of the caliper? I was thinking of heating the head of the bolt with my small butane torch, then waiting and hitting the head with a shot of freon spray to shrink it.

DO NOT use that socket. It's junk, and you'll bugger up the bolt head when it strips. Go buy a brand new one before you even try.

[henrymartin]

Having broken my fair share of bolts over the years, may I chime in?

First, you may want to consider an impact gun (a small, electric one from Sears works wonders, delivering claimed 700 inch pounds - yeah, it doesn't but they can dream it does). I use it all the time now on stubborn bolts and screws, especially old, seized Phillips head stuff.
What you have is old steel bolts rusted (likely) in the aluminum of the caliper. Not the best combo, but a good one for a disaster. I would apply PB Blaster, let soak in, then try to turn the bolts by TIGHTENING them a fraction of a turn. If it moves, then back it out. If not, then try the impact driver. The impacts and twisting works wonders on breaking the bond between two metals. If you don;t have one, use PB and heat or hit it with a hammer a few times (not hard enough to deform the bolt heads). It will break the bond.

Good luck. I tend to work on bikes that sat for 20+ years in yards, so this is what I deal with more often than I'd like to.

If you end up snapping a bolt, forget about screw extractors - you break one of those and you have a major headache on your hands. Instead, get some left turn drill bits and try to drill it out. More often then not, the heat from the drilling loosens the bolts and removes them. But, make sure you have a nice centered hole in case you have to drill it out completely without damaging threads.

Patience and slow is the key here. Good luck.