12pt SAE bolts....

[Buckgnarly]

Anyone ever run into them, and if so, where? Just thinking about it as I have seen metric on cars, but never SAE 12pts.

 

[akhappy]

Some diesels have 12pt fasteners

 

[ChevyEFI]

ARP flywheel bolts.

 

[krdiesel03]

Ford superduty u joints

 

[MotoDave]

Lots of aerospace fasteners are reduced head 12 point, can't say I've run across them on anything else.

 

[JDon99]

ARP flywheel bolts.

This. And you can also order most ARP bolts/nuts in a 12 pt head. I prefer the 12 pt fasteners personally when I buy ARP bolts.

 

[383 240z]

The ujoint strap bolts on the rear axles of mid 80's vettes were 1/4" 12 pt. I used the center section from one of those for my 240z project. Keith

 

[Hpozzuoli]

The cat3208 my dad has in his rv has 4 lifting plates on it. They are held on by 12 pointers for some reason. I don't run into them very often with the Vettes unless some ding dong replaced something and didn't have a regular 6 point bolt on hand.

 

[Mickey O]

Harley Davidson motorcycles use SAE 12 points, head bolts and lifter block bolts.

 

[purplezr2]

I think almost all the applications mentioned are metric, I know the Ford U joints are metric, most diesel driveline 12pts are metric(13mm or 12mm), and I believe HD headbolts are metric. I think NV4500 trans may use 3/8 12pts to hold the back cover on, but it could be 10mm, I don't remember.

 

[donthelegend]

Unit bearing/hub bolts on jeeps with Dana 30 front axles are 13 mm 12 point.

Sent from my SAMSUNG-SGH-I337 using Tapatalk

 

[Chilliwack Murray]

They've been used for years anywhere there is limited real estate for the head of the bolt and tool access like the ujoint straps. They will deliver more torque than an allen head fastener can without damage. They've been used in diesel engine internal fasteners, highway truck differentials since before they were metric. Old (80s) 46,000lb or 48,000lb rockwell diffs with air lockers or two speeds used a 5/8 12pt on a 5/8 bolt for clearance and was guaranteed to bust any wrench but a snap-on back when I worked on them. Every new guy would bust a wrench after insisting their cheap wrenches were just as good and everyone of them bought a SO (in that size at least) after they broke every one in their box.

 

[Deskmechanic]

Most aftermarket connecting rods (with ARP fasteners) are 12 point SAE, usually a 3/8 head.

 

[Hyster Gareth]

Some of the older Cosworth engines use them.

 

[warweapon762]

I've seen them on alot of older aerospace stuff.

 

[gungatim]

2nd gen camaros used them on body under hood, also my harley Ironhead uses them on the headbolts...oh, and rod cap nuts on olds rocket 394 motors of early 60's vintage.

 

[OxJaw]

and I believe HD headbolts are metric.

The twin cam head bolts are 1/2", not sure about the earlier engines but I would guess they are SAE too.

 

[rusjack]

Lots of the stuff on the two engines I work on (GE cf34 and Rolls Royce BR700) use SAE 12pt fasteners. Jet engines are covered with them - I don't have any 6 point tools at work

 

[hsracer]

Building race engines most if not all are 12 point fastners.

 

[navymech]

+1 on the aviation engines. I work on GE T700's. Pretty much exclusively 12pt SAE.

 

[Bigblue&Goldie]

Almost all of the suspension and engine components on our Class 1 off road race car are 12pt SAE. Of course, this isn't an OEM application, but they are used extensively in offroad racing because of their high strength and low profile heads.

 

[garboui]

rear suspension components on hondas

 

[Wakefield]

They've been used for years anywhere there is limited real estate for the head of the bolt and tool access like the ujoint straps. They will deliver more torque than an allen head fastener can without damage. They've been used in diesel engine internal fasteners, highway truck differentials since before they were metric. Old (80s) 46,000lb or 48,000lb rockwell diffs with air lockers or two speeds used a 5/8 12pt on a 5/8 bolt for clearance and was guaranteed to bust any wrench but a snap-on back when I worked on them. Every new guy would bust a wrench after insisting their cheap wrenches were just as good and everyone of them bought a SO (in that size at least) after they broke every one in their box.

Wonder if a Wright wrench would work!

 

[Dynamic86]

All over a Coe veneer lathe at my plywood plant. Had to by a new set of 12 point sockets to work on the damn thing.

 

[Ruger_556]

Starter bolts...

 

[00S4Boy]

Why do I wanna say chrysler products have them on hubs like a 9/16th.

 

[nicksnothereman]

Anyone ever run into them, and if so, where? Just thinking about it as I have seen metric on cars, but never SAE 12pts.

Spline? They exist. Before they started using torx. I think drivetrain is where you'd find them (mainly). If there were more older (70s and 80s) cars on the road you'd be seeing them much more. Past that...not a whole lot.

 

[Deskmechanic]

Rear main seal retainer on Chrysler big block (B/RB/Gen II hemi) and slant six from at least 1959 had two long bolts with 12-point 3/8 heads.

 

[Karl_B]

Oldsmobile V8 engines used 12 point nuts on the connecting rods from 1964-1990. I've only run across them a handful of times other than that in my projects.

 

[Ray-CA]

Fox body Mustangs have 12-pt bolts on the u-joints.

Ray

 

[byoungblood]

Fox body Mustangs have 12-pt bolts on the u-joints.

Ray

Except they're metric.

 

[sberry]

Almost all of the suspension and engine components on our Class 1 off road race car are 12pt SAE. Of course, this isn't an OEM application, but they are used extensively in offroad racing because of their high strength and low profile heads.

Another thing is it reduces the chance of the wrong grade of fastener being reinstalled.

 

[knobby]

Harley Davidson motorcycles use SAE 12 points, head bolts and lifter block bolts.

brake calipers bolts as well