Anyone a Bolt Expert?

Discussion in 'The BS Topic' started by badazz81z28, Sep 7, 2019.

  1. badazz81z28

    badazz81z28 Veteran Member

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    So I'm looking for 14mm bolt replacements because the application I'm using requires a longer bolt. I'm finding the size I need online, but for some reason the bolt head is bigger. Everywhere I look it shows a 22mm head and the actual bolt I have and need is 21mm.

    Now according to what I can find for measurements ANSI/ISO spec is 21mm and DIN is 22mm. Are the bolts actually different or just what each spec refers to the same bolt as?

    https://www.boltdepot.com/fastener-information/Bolts/Metric-Bolt-Head-Size.aspx?nv=res
     
  2. 73 Z

    73 Z Veteran Member Gold Member

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    Not sure what your referring to 14mm thread dia with a 21/22mm (head (socket size) vs bolt shoulder base
     
  3. dave@ztech

    dave@ztech Veteran Member Lifetime Gold Member

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    I am not following as well, you can have a 14mm bolt that is say for easy understanding 1 inch long, or 3 inches long and still be a 14 mm bolt , so ..............
     
  4. Fbird

    Fbird Veteran Member Lifetime Gold Member

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    DIN is Euronorm, ANSI is american standard. Flange and head are the only things dimensionally affected.(don't even ask about JIS or British unified) . ie Grade 8 is for INCH sizes vs grade 10.9 would be METRIC equivalent

    Grade 2 Low strength.
    Grade 2H Nuts Strength is similar to Grade 5. Use with ASTM A325 structural bolts.
    Grade 5 Medium strength.
    Grade 8 High strength.
    Metric Class 4 Similar to Grade 2.
    Metric Class 8.8 Similar to Grade 5.
    Metric Class 10.9 Similar to Grade 8.
    Metric Class 12.9 The highest metric class for strength, it exceeds Grade 8.

    you can find DIN spec bolts...but you will have to look
     
    Last edited: Sep 8, 2019
  5. badazz81z28

    badazz81z28 Veteran Member

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    Re-phrased....I have 14MM bolts that are 45mm long. I need 14MM bolts that are 50mm long. My current bolt has a 21mm wrench head, all the ones online are 22mm. Are they actually all 22mm or is it just a "nominal size" and they are actually 21mm like the bolts I have.
     
  6. Mike N

    Mike N Administrator Staff Member Lifetime Gold Member

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    Are you restricted space wise to needing a 21mm head versus 22mm?

    If not, no worries so long as the length and grading are correct.
     
  7. Fbird

    Fbird Veteran Member Lifetime Gold Member

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    22mm would be the "wrench" size of the bolt head. There are different standards (nominal) sizes ...depends on the manufacturer. WE are ANSI (united states)....so unless DIN spec is specifically dictated you should get a 14mm bolt with a 22 mm hex head.
     
  8. 73 Z

    73 Z Veteran Member Gold Member

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    If a 22mm wrench head fits with no clearance issues then use that, with what ever 14mm thread depth. If clearance is an issue then a 12 point will gain some, but a 21mm will always be smaller.
     
  9. John Wright

    John Wright Veteran Member Lifetime Gold Member

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  10. GoldenOne7710

    GoldenOne7710 Equal Opportunity Offender Lifetime Gold Member

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    Is there no Fastenal or ACE Hardware around you?

    My local ACE Hardware store has probably the best selection of fasteners I've ever seen...with outstanding prices. They blow Lowe's and Home Depot away on both price and selection. From tinnie tiny to HUGE. Metric and standard and every grade you could think of.
     

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