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  1. #1
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    Proper name for pictured



    For sake of clarity in mentioning, but what is the proper name for these? Hex bolt, Allen bolt, hex screw, hex fastener, or metal piece that you overtorque?

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    The Red Lantern Rev.Chuck's Avatar
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    socket head cap screw, except for the one with the shoulder on it, then you would stick shoulder in there somewhere.
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    B-b-b-b-b-b-bicicle Rider orange leader's Avatar
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    Quote Originally Posted by Rev.Chuck
    socket head cap screw, except for the one with the shoulder on it, then you would stick shoulder in there somewhere.
    the farthest on the left is a flat socket head cap screw.
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    Senior Member Thrifty1's Avatar
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    Hex head cap bolt.......

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    The Red Lantern Rev.Chuck's Avatar
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    Quote Originally Posted by orange leader
    the farthest on the left is a flat socket head cap screw.
    I would call that one countersunk, in that it fits into a hole beveled to match the bevel of the screw so that it flush with the top of the work piece. There are also truly flat socket screws with no bevel on the threaded side.
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    Quote Originally Posted by Rev.Chuck
    socket head cap screw, except for the one with the shoulder on it, then you would stick shoulder in there somewhere.
    This man knows his hardware.

    The general public tends to call them Allen screws/bolts or what ever, but they are in fact socket head cap screws. The hardware most commonly called "bolts" are in fact hex head cap screws, often abbreviated HHCS.

    I do believe that the Allen Corporation is responsible for the creation of the Allen bolt and much like the generic use of Jet Ski for personal watercraft, the name has stuck.

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    My bikes became Vintage OLDYELLR's Avatar
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    Quote Originally Posted by Rev.Chuck
    socket head cap screw, except for the one with the shoulder on it, then you would stick shoulder in there somewhere.
    Yeah, we call them shoulder screws or stripper bolts (because they are often used to secure stripper plates in dies). Anyway, they're all hex socket head screws. Allen screws is also used. That was probably a brand name at some point, either fot the screws or wrenches.
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    I like the serpentine arrangement. I think most people would have just posed them linearly, justifed by the center or the tops. It's just another example of the sort of class that one can expect from posters here at Bike Forums.

  9. #9
    rebmeM roineS JanMM's Avatar
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    A hex on all of them!

  10. #10
    Gone, but not forgotten Sheldon Brown's Avatar
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    Quote Originally Posted by mlts22


    For sake of clarity in mentioning, but what is the proper name for these? Hex bolt, Allen bolt, hex screw, hex fastener, or metal piece that you overtorque?
    Colloquially, they're "allen bolts."

    That's what I generally call them, though it's probably a violation of Allen's trademark. I think something like that happede with "phillips" head screws.

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    otherwiseordinary lymbzero's Avatar
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    hex bolts, hex screw

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    *****es love tarck kemmer's Avatar
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    Quote Originally Posted by OLDYELLR
    Yeah, we call them shoulder screws or stripper bolts...
    So long as you don't call it a stripper screw cause that makes me thing of something entirely different ...

  13. #13
    My bikes became Vintage OLDYELLR's Avatar
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    Quote Originally Posted by lymbzero
    hex bolts, hex screw
    No, they are all hex socket head screws or bolts. That's probably the reason most call them allen screws, to avoid confusing folks who don't understand "socket".
    1981 Nishiki Ultimate
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  14. #14
    Prefers Cicero cooker's Avatar
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    What's the difference between a screw and a bolt? Does a bolt have to have a nut?

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    My bikes became Vintage OLDYELLR's Avatar
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    Generally, a bolt uses a nut and a screw, doesn't, but I can think of many instances where it is just the opposite. Look at Wikipedia for an extensive dissertation. Incidentally, it looks like that's where the picture at the top of this thread came from.
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  16. #16
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    My good friend Joe used to own a mid-sized fastener distributor here in the So CA area. Banner specialized in stainless socket screws and hi-grade fasteners. Quite a bit of his inventory was sourced to China. Joe retired about 7/8 years ago. I’ve learned quite a bit about fasteners from Joe during our chats at the gym. Joe came from back east and swore he would never engage in aircraft grade fasteners after the incident with the FBI. When a US submarine (can’t remember the name) sank in the 1960’s, the FBI showed up at his place of employment asking for all kinds of records, materials testing reports etc. Joe was just an employee at that point and the company wasn’t involved in the problem. But their fasteners were used on that sub and the FBI was investigating everything used to manufacture the submarine.

    By the late 70’s Joe had moved to the west coast and opened his own company. It was 1981 and he received a phone call from a Boeing representative. Boeing was referred to him by SPS (I think it was SPS, huge supplier to General Dynamics) because they couldn’t turn this special socket head shoulder screw around in time. SPS apparently needed 12 weeks to produce this item. Joe politely refused the order saying he doesn’t supply aircraft fasteners (not enough insurance, too much paperwork, can’t sleep at night etc.).

    Boeing said “ok, but it’s not for an aircraft,.........its for a hovercraft”. Joe, “are you sure?”. Yes, yes and yes its for a Hovercraft we’re building for the Army. Joe, “OK send me the plans”. The plans arrived and this socket screw was about 3” long, had a rather massive shoulder on it, but was made of this very strange hi-grade metal alloy that was more money than Beryllium. Joe to Boeing, “you want this when…..I can’t even get this material”. Boeing, “no problem, we’ll supply it for you”. So Boeing sent Joe the material, and within 2 weeks, Joe had a proto-type up to Boeing. Boeing approved the proto-type and 3 weeks later, Joe had the 25 bolts ready (about a $9,000 order). He had sent the manufacturing out to a local machine screw supplier. He called Boeing, said the order was ready and they reassured him again “it wasn’t for an aircraft”.

    Boeing asked him if he could take them over to LAX, at this special military spot. Joe drives over there and has this small package with him. He is directed over near the tarmac and is sitting around on a bench watching the planes take-off and land. A pilot walks up to him and ask him if he is so and so and if he had a Boeing package. Joe hands him the package, the pilot walks back over to a military jet, gets into the cockpit and Joe watches him take off. At this point Joe figures he has been snookered by Boeing, how could they afford to send a jet to pick this up. Joe calls his contact at Boeing before he leaves the base, asks again if this was for an aircraft and is told no. Joe doesn’t believe the explanation but decides to go home and forget about it.

    But something doesn’t smell right.

    Two weeks later Boeing calls Joe. Boeing “hello Joe, I just wanted to let you know that those socket screws worked great, thank you”. Joe, “those were for an aircraft weren’t they?”. Boeing “well Joe, yes they were, we really needed ‘em”. Joe “G** D*****, I told you I don’t do aircraft parts. What the F*** were they for and why did you need them from me”……..

    Boeing “well Joe, you’re right, we’re sorry. It was for aerospace usage. Those fasteners were used to bolt the Space Shuttle to the first 747 for travel back to the Cape”……..

    Joe hung up the phone, shaking, and told his son, he was going home for the day. Joe brought one of them into the gym about 3 years ago. Heavy bolt, highly machined. Kind of cool holding a piece of space history even if that particular bolt was just one of the extras out of the batch. He still has 3 of them.

    So yeah the technical term for those bolts as pictured are socket head screws. Add in the term “shoulder” and you have a socket head shoulder screw. The public refers to this item as an allen head bolt, the fastener industry calls it a socket head screw.

    Fastener trivia: nuts of the same grade, are generally 5 times as strong as bolts (internal threads vs. external threads). That is the reason why you don't need a grade 8 nut with a grade 8 bolt, the nut is always much stronger. Always tighten the screw/bolt to torque spec, not the nut. That is the way the fastener was engineered. Amazing what you can learn at the gym. Forgive me if I messed up the time-line a bit, this is from memory. For the record, Joe is in his 70’s and rides a beat up Nishiki Prestige (bike content). It recently fell off the back of a automotive trunk rack and dented the frame and bent the forks. He still rides it, although we decided he shouldn’t spend anymore money on it.

  17. #17
    Electrical Hazard
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    Damn, I love fridays around here.

  18. #18
    Senior Member Chuckie J.'s Avatar
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    Interesting story; thanks for taking the time to share it and great info on bolts!

    Chuckie

  19. #19
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    I loved the story Dunwood, maybe you should start a "Tales from the Gym" thread.

  20. #20
    Senior Member jtfind's Avatar
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    Proper Names

    8 of them are 'Hexagon socket head cap screws' of various sizes. The one on the left was correctly identified as a 'flat socket head cap screw' but since there are also splined type, you may want to specify 'Hex'. The 6th one from the left is a 'Hexagon socket head shoulder screw'. They are all defined for size, dimensions and strengths by ANSI B18.3. Machinery's Handbook has all of the data you need if you are designing something using them.

    :-)

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