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Tool Talk Discussion Forum

Bolts/Capscrews with 12 point heads.

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J Schwiebert

02-16-2008 08:17:16




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What is the correct name for these and where can I document it as I need this for a mechanics class I am helping with? Thanks in advance. J.




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BigMarv1085inGa.

02-17-2008 16:48:43




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 Re: Bolts/Capscrews with 12 point heads. in reply to J Schwiebert, 02-16-2008 08:17:16  
They are pretty much used all over sections of major aircraft. Most have a strength of over 180 ksi strength and they don't have a big head so in most applications they are installed in hard to get places.



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jose bagge

02-16-2008 20:30:24




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 Re: Bolts/Capscrews with 12 point heads. in reply to J Schwiebert, 02-16-2008 08:17:16  
don't know the real name, but most common use is on GM car and truck universal joint saddles. I guess the idea is to give you the ability to apply more torque with a smaller bolt head for tight areas?



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36 coupe

02-17-2008 14:10:21




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 Re: Bolts/Capscrews with 12 point heads. in reply to jose bagge, 02-16-2008 20:30:24  
Ford uses a metric 12mm 12 point bolt on u joints.



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PaulW_NJ

02-16-2008 19:37:54




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 Re: Bolts/Capscrews with 12 point heads. in reply to J Schwiebert, 02-16-2008 08:17:16  
third party image

I just replaced the Orings and seals in a CharLyn power steering unit, and the housing was held together with 12 point cap screws. Had the hardest time figuring out what they were and how to get them off till a machinist told me a 12 point socket would fit them. I bought a 5/16 -12 point socket. I never knew they made 12 point sockets that small!

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bill b va

02-16-2008 17:51:58




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 Re: Bolts/Capscrews with 12 point heads. in reply to J Schwiebert, 02-16-2008 08:17:16  

also called counter-bore screw



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Gerald J.

02-16-2008 17:40:37




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 Re: Bolts/Capscrews with 12 point heads. in reply to J Schwiebert, 02-16-2008 08:17:16  
There may be more than one type of 12 point head. Some are called tripple square, some double hex. Which can mean the points are 90 or 120 degree angles. Good fitting sockets for one won't fit the other well.

Gerald J.



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glennster

02-16-2008 16:10:01




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 Re: Bolts/Capscrews with 12 point heads. in reply to J Schwiebert, 02-16-2008 08:17:16  
we see them on cars a lot at the body shop. also see the torx head bolts that need a socket to get em off. then there are those dang tamper proof torx too. we wound up buying the socket set from matco especially for them. see em in seat belts, seat tracks, air bag stuff. european cars love to hide em all over the place.



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Kentb of SWMO

02-16-2008 15:03:45




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 Re: Bolts/Capscrews with 12 point heads. in reply to J Schwiebert, 02-16-2008 08:17:16  
Have you guys ever seen a 12 point socket head capscrew? Mecury outdrives use them where the outdrive pivots up and down. I think they are used mostly to adjust the limit switch on the power lifts and ajust the sender for out drive position buy I went to CAT and bought a 12 point capscrew to build a wrench to remove them.

Kent



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Rod (NH)

02-16-2008 10:52:03




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 Re: Bolts/Capscrews with 12 point heads. in reply to J Schwiebert, 02-16-2008 08:17:16  
I suppose it all depends on how you define "correct". American Standard ASA B18.12, American Society of Mechanical Engineers 1962, Glossary of Terms for Mechanical Fasteners refers to them as "Twelve-Point Head" or "Double Hexagon Head". No mention of Ferry or any other specific manufacturer.



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J Schwiebert

02-16-2008 09:49:53




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 Re: Bolts/Capscrews with 12 point heads. in reply to J Schwiebert, 02-16-2008 08:17:16  
Thanks guys: I had been told years ago when I turned wreches for a living that they were called Ferry because of the company that made them. And as Paul Harvey said Now I have the rest of the story/ J.



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dobber

02-16-2008 09:17:58




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 Re: Bolts/Capscrews with 12 point heads. in reply to J Schwiebert, 02-16-2008 08:17:16  
Dale got it right on and google turns this one up and many others....



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Dale B

02-16-2008 08:49:41




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 Re: Bolts/Capscrews with 12 point heads. in reply to J Schwiebert, 02-16-2008 08:17:16  
I work for a Case dlr, and in the manuals , they are called Ferry Head bolts.Sounds like a mfr name , like Allen head etc.



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dobber

02-16-2008 08:41:10




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 Re: Bolts/Capscrews with 12 point heads. in reply to J Schwiebert, 02-16-2008 08:17:16  
Only seen those called 12 point, or 12 point design. Maybe there is a fancy name for them but why? There is much more to a bolt's design and makeup in critical ways than just the head design. Check sites at fastener companies like Fastenal or others. Maybe see what companies call other special head bolts for aircraft and aerospace. Apex is one I remember a offset phillips head design requiring the special Apex driver. ARP catalog only calls them 12 point or 12 point design unless I missed something and others called hex head.

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rockyhawaii

02-16-2008 08:31:47




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 Re: Bolts/Capscrews with 12 point heads. in reply to J Schwiebert, 02-16-2008 08:17:16  
Flange screws



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