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19th January 2019, 08:58 | #1 |
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M30 diameter
Morning,
Not car related... So I know an m30 bolt is 30mm diameter to the outer edge of the threads....but does 29.6mm qualify as an m30? I'm changing the trv heads on my rads. |
19th January 2019, 09:11 | #2 |
Precise
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The M30 designation is only the nominal diameter, there will always be a tolerance, 29.6 is near enough, do not worry, the top of the thread is always slightly rounded to ensure clearance when fitted..
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19th January 2019, 12:51 | #3 |
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Are metric threads used on plumbing parts? I always thought they were BSP, but maybe it's changed?
TC |
19th January 2019, 14:17 | #4 |
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29.6mm (How/with what are you measuring it?) is closer to 30mm than either 3/4" BSP or 1"BSP
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19th January 2019, 15:26 | #5 |
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Just looked up Metric thread tolerancing and depending on the grade the minimum O/D could be 29,522mm, max O/D 29.947mm, so 29.6mm could well be a nominal 30mm
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19th January 2019, 16:31 | #6 |
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If you're changing the TRV's and wondering what size thread they are then as far as I know they're std, so you can't go wrong.
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19th January 2019, 16:52 | #7 |
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19th January 2019, 17:00 | #8 |
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Get a set of Zeus charts and you can check the pitch just to be sure, they've proved very useful for when I've been checking screws and bolts.
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19th January 2019, 17:06 | #9 |
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Zues been over 30 years since I last heard that when I was an apprentice
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19th January 2019, 20:01 | #10 | |||
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Quote:
Quote:
Quote:
As far as I can tell there are at least 3 different sizes depending on age and manufacturer! |
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