12 point bolt heads - non-aerospace applications

[T45]

Curious to catalog some applications and favortite hex and drive sizes to tackle them 12 point fasteners.

These are general buckets I've seen so far, but pleae correct me as needed.

- Aerospace (various, may include spline, SAE+1/4 drive)

- Special application axel nuts (larger sizes metric 24mm+, 1/2 drive)

- Some engine hardware [...]

 

[Moose-LandTran]

Head bolts, cam cap bolts, main bearing bolts, big end bolts, crank pulley bolts, flywheel bolts, clutch bolts.

 

[Loscaldazar]

Head bolts on Subaru and numerous other manufacturers.

 

[Fordriver6]

Driveshaft bolts on Ford 8.8 rear ends.

 

[BlkSlvrdo129]

ARP fasteners usually used on the engine are 12pt.

 

[NorthSea92]

Carrier bolts on certain Land Rovers


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[alwaysFlOoReD]

Some exhaust header bolts. Front driveshaft on some fords.

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[94EG8]

Among what's already been mentioned Honda started using them on door hinges in the last few years.

 

[Mhyde52]

The place I regularly run into 12 point bolts are the special pivot bolts on Toro reel mowers.

Only time I've specifically taken out a 12 point socket (3/8") in the last 6 months.

 

[rsanter]

Anything you need a smaller diameter socket due to space restrictions

Bob

 

[CatSplat]

Jeep wheel bearing hub to knuckle bolts are typically 12pt.

 

[wafrederick]

Jeep 4.0 headbolts,Harley Davidson engines with the rocker box bolts and the fastners holding the heads in place.3/8 12 point in the 4L80E

 

[Aqua-Andy]

Duramax head bolts.

 

[jobo1004]

Honda uses them on flywheel and pressure plate bolts.

 

[metaldad]

York uses them on their centrifugal compressors

 

[shockwave]

Caliper brackets on Land Rover use 21mm 12 point

 

[Wamsutta]

They are fantastic. They give you a well connected feel.

 

[sourwould]

Every Garrett T3 turbo I've removed has had them on the manifold side.

 

[firworks]

I think Caterpillar uses them around in random places. I'm pretty sure I've seen them in a Motorgrader cab before.

 

[wafrederick]

Some axle nuts are a 12 point as well.Toyota/Lexus,Audi and VW use 12 point axle nuts.The Pontiac Vibe also which is a Toyota Matrix

 

[Hondarancher4435]

Old cat forklift wheel bolts. Dodge Ram driveshaft their all over the place if you don't have 12pt sockets you will want to get some

 

[Bigblue&Goldie]

Race cars.

 

[MacMcMacmac]

Quincy compressor head bolts.

 

[IsaacJ]

dana front axle unit bearing bolts, 9/16 I believe. Also 12mm for ford driveshaft bolts.

 

[kunkernator]

A lot of Caterpillar engines I work on use 12 point bolts, specifically in low clearance applications. Exhaust manifolds are common, as well as intake manifolds. Head bolts, rod bolts are almost universally 12 point.


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[Bondo]

Ayuh,.... Mercruiser Alpha drive top cap bolts,....

Mercruiser y-pipe bolts to the transom housin',....

 

[rockwithjason]

Cummins engines

 

[mailpup]

If you ever go to a NASCAR race and visit a Chevy car and truck exhibit on the midway, they usually have a few high performance engines on standalone displays. Those engines have lots of 12 pt. fasteners on them.

 

[alien]

I changed all the engine and engine cover bolts on my last Harley to ARP Stainless grade 8-12 point fasteners. Better than the stock torx and allen bolts. And IMHO better than any of the chrome alternatives. Factory bolts always oxidized and the torx button heads would strip out. I never had a problem removing the 12 point fasteners. I am a fan.

I don't have that bike anymore and it would cost $500+ to do it to the new bike. I'm sure over time I will though.

 

[SRD9Boss]

2.4 l kia couple of the lower oil pan bolts are 12pt

 

[smittyjones]

Driveshaft bolts on Ford 8.8 rear ends.

Yeah boy. Sunex makes a 12pt 12mm swivel socket specifically for this application. It works like a charm.

 

[Fordriver6]

Yeah boy. Sunex makes a 12pt 12mm swivel socket specifically for this application. It works like a charm.

Picked one up last month. [emoji106]

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[sk farmer]

steering sector and orbit motors in ag applications.

 

[T45]

wow, lots of great replies ... thanks to all who contributed

 

[ibedayank]

cylinder base nuts for Triumph and BSA motorcycles

 

[geartow]

Most drive shafts on trucks. The sprinters use inverted torx.

 

[RedF]

Driveshafts on all kinds of things, including medium duty trucks. Dodge unit bearings. Headers. Super handy for some styles of hydraulic orbit motors - nothing else fits well.

They are also known as "ferry head bolts". Why are you wondering?