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Smoothie · Posted: Thu Jun 12, 2008 5:32 am Post subject:

I happen to have my old head bolts laying around. The thread is M12x1.75, length with the washer in place is 110mm, and length without washer is 114mm (washer is 4mm thick

). Overall length including the head (hex socket head) is 126mm (12mm head length).
Info stamped into the head is "M12 - INBUS 10.9".
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"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

bass gt · Posted: Thu Jun 12, 2008 5:43 am Post subject:

bass gt · Posted: Thu Jun 12, 2008 5:44 am Post subject:

Smoothie,

Forgot to ask. What is the length of the bottom thread? i will need this too

Steve
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Front Wheel Drive is the Devil's work.

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11723 Location: PacNW

Yeah, I don't have the worksheet yet, but I suspect they will want the depth of the threaded hole in the block.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

Smoothie · Posted: Thu Jun 12, 2008 5:56 am Post subject:

I noticed you asked for the "bottom diameter" before, now the "length of the bottom thread".. Assuming by length you mean the length of the whole threaded section, my trusty calipers say 33.4mm. -And for the diameter of the first thread I get 11mm (caliper over the rest of the threads shows 11.7mm).

Washer ID is 12.5mm, OD is 23mm, thickness as mentioned before is still 4mm.

_________________
"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

bass gt · Posted: Thu Jun 12, 2008 6:02 am Post subject:

-nick · Joined: 16 Nov 2002 Posts: 2699 Location: Cambridge, MA

Ah, this is an oldy. I ended up going Smoothie-style and cut a notch out of the tops of the studs with a dremmel so that I can just use a flathead screwdriver to twist them in and out. Works like a charm.
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1980 931S
15psi boost, MS-II, EDIS, 951 IC, custom intake, Ford 5.0L throttle body, Forge BOV, WB o2, G31 w/LSD, 964 wheels, 968 rear sway, Bilsteins, 200# Welt. springs. A laptop, and a partridge in a pear tree.
1991 964 C4 Cabriolet

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11723 Location: PacNW

Here be the ARP worksheet:

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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11723 Location: PacNW

Awfully close here. . .anyone?
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

bass gt · Posted: Thu Jun 19, 2008 1:51 am Post subject:

Rasta,

Sorry, been up to my ears in it at work. I have spoken to the Guy's at Arrow, and should have the info/ part number by tomorrow.
One thing i need checking though please. Looking at the details supplied, 1.5 seems to be very fine for a bolt of this size. I would expect it to be 1.75 pitch. Can someone remeasure and confirm this lower pitch size for me. Looking at the Ford items, they all run 1.75 so it seems logical that it should be that.

Steve
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Front Wheel Drive is the Devil's work.

Smoothie · Posted: Thu Jun 19, 2008 6:42 am Post subject:

Absitively someone else measure to confirm, but Steve, I think you're actually the only one that's suggested it might have been a 1.50 pitch, right?

bass gt · Posted: Thu Jun 19, 2008 8:16 am Post subject:

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11723 Location: PacNW

Didn't mean to get you thinking it was some huge rush, Steve. I appreciate your help, and your own schedule is fine by me.

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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

RC · Joined: 25 Mar 2007 Posts: 2636 Location: Australia

So is there a group buy happening here?

macBdog · Posted: Thu Jun 19, 2008 10:15 am Post subject:

I'll get some, my engine is coming out soon.
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1979 931 with a 350 chev
1973 911E with EFI