Very small metric thread size

[Ron LadenParticipant @ronladen17547]

On a tiny geared motor I have just purchased there are two threaded holes on the mounting plate which have an internal diameter of 1.1 mm would I be correct in thinking that is M1.4 mm thread size. I have nothing that small just thought I would check before I source some screws.

Ron

[Ron LadenParticipant @ronladen17547]

[Frances IoMParticipant @francesiom58905]

?1.2mm though away from my ref books at moment

[JasonBModerator @jasonb]

It's the most likely as M1.4 has a pitch of 0.3mm and usual rule of thumb is OD-pitch to get the tapping size.

[Thor 🇳🇴Participant @thor]

Hi Ron,

As Jason says, most likely M1.4, in the past I have sourced such screws from my Optician. There is a table here, showing Metric Coarse and Fine thread data.

Thor

[Nigel Graham 2Participant @nigelgraham2]

By the Tracy Tools table:

ISO Coarse only,

M1 X 0.25mm pitch

M1.1 X 0.25

M1.2 X 0.25

M1.4 X 0.3

M1.6 X 0.35

(M1.7 0.35)

M1.8 X 0.35

M2.0 X 0.4 and X (0.45).

Those in parentheses, "non-preferred&quot

[Ron LadenParticipant @ronladen17547]

Thanks guys, thats helpful I will get some screws ordered.

Ron

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