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Topic: Odd vs. Even  (Read 903 times)

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« on: March 26, 2012, 08:34:58 AM »

While wrenching on both the Beemer and Honda this weekend I noticed that other than the veritable 10mm most bolts on the BMW are odd sized and most on the Honda are even. Curious.   Headscratch

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« Reply #1 on: March 26, 2012, 08:46:54 AM »

My KTM has lots of 8mm, some 10s, and a few 13s, plus they are fond of both 5mm and 6mm allens as well as three (I think) Torx bits. Many of the hex head bolts also have Torx centers.

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« Reply #2 on: March 26, 2012, 09:55:10 AM »

my Adventure has a mix of odd and even. and the torx as mentioned. I do like the fact that the torx is also a hex head so you can use a regular socket if you choose. Chain tensioning on the KTM requires a 10 & 13mm while the honda takes 2-12's?

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« Reply #3 on: March 26, 2012, 10:27:21 AM »

JIS - Japanese Industrial Standard vs. ISO/ANSI/DIN. Same bolt sizes and thread pitch but different head sizes.

Here's a table that illustrates this -

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« Reply #4 on: March 26, 2012, 11:03:03 AM »

What i don't like is when i go to the hardware store for a replacement bolt it's allways an odd size. (11,13,15 mm)

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