Rear Upper Control Arm Bolt Thread Pitch
Thread Starter
Racer
Joined: Jul 2004
Posts: 285
Likes: 5
From: Palos Verdes California
Rear Upper Control Arm Bolt Thread Pitch
Does anyone know what the thread pitch is for the 18mm rear upper control arm bolt is? I need to get a tap to clean up the threads in the control arm mount/nut. Thanks!
Team Owner
Joined: May 2001
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From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Thread Starter
Racer
Joined: Jul 2004
Posts: 285
Likes: 5
From: Palos Verdes California
Safety Car
Joined: Dec 2010
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From: Fords, NJ
18mm is the wrench size.....the thread size is M12 x 1.75 pitch, which is what LoneStar said
Last edited by SG Lou; Dec 27, 2015 at 12:08 PM.
Team Owner
Joined: May 2001
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From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Tip for future reference: When looking for fasteners, whether it's bolts OR nuts, etc, never reference the wrench size as that can vary all over the place, especially when dealing with factory OE fasteners. That applies to both metric and SAE fasteners.
HTH
HTH
Burning Brakes
Joined: Dec 2009
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From: King George VA
General rule of thumb: When it comes to bolts, wrench size is generally 1.5x the thread diamater. Of course, it's not an exact measurement. For example, a 1/2" bolt will have a 3/4" head, same for 12mm bolt with an 18mm head. Now, when you start dealing with nuts that are heat-treated, that rule goes away.
1/4" bolt- 1/2" wrench
5/16 - 9/16 wrench
3/8- 5/8 wrench
1/2- 3/4 wrench
So on and so forth
$.02
P.S. A thread gauge with standard and metric pitches is a very useful thing to have.
1/4" bolt- 1/2" wrench
5/16 - 9/16 wrench
3/8- 5/8 wrench
1/2- 3/4 wrench
So on and so forth
$.02
P.S. A thread gauge with standard and metric pitches is a very useful thing to have.
Last edited by LiteraCola; Dec 30, 2015 at 01:23 PM.
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
General rule of thumb: When it comes to bolts, wrench size is generally 1.5x the thread diamater. Of course, it's not an exact measurement. For example, a 1/2" bolt will have a 3/4" head, same for 12mm bolt with an 18mm head. Now, when you start dealing with nuts that are heat-treated, that rule goes away.
1/4" bolt- 1/2" wrench
5/16 - 9/16 wrench
3/8- 5/8 wrench
1/2- 3/4 wrench
So on and so forth
$.02
P.S. A thread gauge with standard and metric pitches is a very useful thing to have.
1/4" bolt- 1/2" wrench
5/16 - 9/16 wrench
3/8- 5/8 wrench
1/2- 3/4 wrench
So on and so forth
$.02
P.S. A thread gauge with standard and metric pitches is a very useful thing to have.
This is true for several of the common/popular sizes, but not all, as when you get into the larger bolts, it changes. For 3/16", 1/4", 5/16", 3/8" and 7/16" though it does apply.
3/16" bolt = 3/8" wrench/socket size
1/4" bolt = 7/16" wrench/socket size
5/16" bolt = 1/2" wrench/socket size
3/8" bolt = 9/16" wrench/socket size
7/16" bolt = 5/8" wrench/bolt size
Last edited by LoneStarFRC; Dec 30, 2015 at 01:56 PM. Reason: add info
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