Results 1 to 4 of 4
  1. #1
    3cb
    3cb is offline
    mtbr member
    Reputation:
    Join Date
    Jan 2004
    Posts
    43

    na´ve Q: how does bolt sizing nomenclature work?

    Do bolt sizings like M5 and M6 refer to diameter and thread measure? When ordering bolts, do I somehow specify the length or the type of head required? Is there any recommended site or chart that gives an overview on how bolts are sized/named?

    I have some pretty funky bolts that I'd like to swap out, like a really long leather tensioner on a brooks saddle, but I have no idea how to size it for replacement.

  2. #2
    Max
    Max is offline
    Velodramatic
    Reputation: Max's Avatar
    Join Date
    Jan 2004
    Posts
    533
    bolts and screws are named as follows: M6 x 40 means a bolt with a diameter of 6 mm and 40 mm long thread. just measure how thick your bolts are and how long the thread is. dont forget that you need Hex-bolts

  3. #3
    mtbr member
    Reputation: tmaybee's Avatar
    Join Date
    Jan 2004
    Posts
    162
    Quote Originally Posted by Max
    bolts and screws are named as follows: M6 x 40 means a bolt with a diameter of 6 mm and 40 mm long thread. just measure how thick your bolts are and how long the thread is. dont forget that you need Hex-bolts

    There is also one other part to the size.

    M6 x 1 x 40 means a bolt with a diameter of 6 mm , with a thread pitch of 1 mm and 40 mm long

    Hope this helps,
    Trevor

  4. #4
    mtbr member
    Reputation: Ultra Magnus's Avatar
    Join Date
    Jan 2004
    Posts
    2,160
    Also, to add, metric threads are called out by nominal diameter and pitch. Pitch being the distance from one thread to the next, like peak to peak. Like an M6x1 means that its a 6mm dia thread, with threads spaced 1mm apart. Some designation have fine and coarse threads like there's a M8x1 and a M8x1.25, M8x1 being a finer thread.

    US threads are called out by diameter and threads per inch. Like a 3/8-16 UNC is a coarse thread, 3/8" in diameter, one thread per 1/16". A 3/8-24 UNF is a fine thread, having its threads spaced 1/24th of an inch apart.

Similar Threads

  1. Replies: 68
    Last Post: 02-06-2004, 11:53 AM

Members who have read this thread: 0

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

THE SITE

ABOUT MTBR

VISIT US AT

mtbr.com and the ConsumerReview Network are business units of Invenda Corporation

(C) Copyright 1996-2018. All Rights Reserved.