Got a Tech Drawing today with measurements and all that. I understand everything except for one part where they've specified a bolt with M4 P=0.35. The M part I get but what does the P specify?
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I would go with Pitch of 0.35mm ie 1 turn advances by 0.35mm
A view of the drawing may clarify this.
answered Feb 25, 2019 at 15:33
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$\begingroup$ The standard fine pitch of an M4 thread is 0.5mm, so this is a non-standard thread that shouldn't strictly have been given an "M" designation. The fine pitch of M2.5, M3, and M3.5 are all 0.35mm, however, so it's not a completely oddball value of pitch. $\endgroup$ Feb 25, 2019 at 22:23
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$\begingroup$ @JonathanRSwift makes you wonder if some drawing package did a rounding when it should not have... $\endgroup$ Feb 26, 2019 at 19:08
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$\begingroup$ Yes... should be able to measure the diameter to confirm though, so better that be in question than the pitch. $\endgroup$ Feb 27, 2019 at 4:32