Kenny202 Posted August 17, 2021 Share Posted August 17, 2021 Trying to source some special metric screws, and have a sample. I looked on google and says to measure a metric screw simply measure across the thread. I put my micrometer on it and appears to be 4mm, but going by the specs of the thing I am putting them in they should be either 3mm or 5mm? Am I doing something wrong or if they measure 4mm across the thread they are 4mm 1 Link to comment Share on other sites More sharing options...
VocalNeal Posted August 17, 2021 Share Posted August 17, 2021 (edited) Your 3,4 and 5mm are the outside diameter of the thread. They fit in 3.1, 4.1 and 5.1mm, or slightly bigger holes. Depending on who drilled them. Where in BKK> There is a good nut and bolt shop om Rama 4 approximately opposite the BMW dealer, just down from the Honda dealer. EDIT: Shop above does not sell wood screws. Edited August 17, 2021 by VocalNeal 2 Link to comment Share on other sites More sharing options...
Yellowtail Posted August 17, 2021 Share Posted August 17, 2021 Along with the nominal size you will need to measure the pitch. Using a decent scale, measure the distance from thread to thread. This may be easier to do by counting how many threads in a cm and dividing. Link to comment Share on other sites More sharing options...
Jen65 Posted August 17, 2021 Share Posted August 17, 2021 buy a thread gauge . could be coarse or fine thread Link to comment Share on other sites More sharing options...
OneMoreFarang Posted August 17, 2021 Share Posted August 17, 2021 16 minutes ago, VocalNeal said: Your 3,4 and 5mm are the outside diameter of the thread. They fit in 3.1, 4.1 and 5.1mm, or slightly bigger holes. Depending on who drilled them. Where in BKK> There is a good nut and bolt shop om Rama 4 approximately opposite the BMW dealer, just down from the Honda dealer. Here is a link to that shop. It shows a picture but you can change it to the map view to see exactly where it is. https://www.google.com/maps/place/บริษัท+ตงเลี้ยง+(1995)+จำกัด/@13.719173,100.5640485,3a,75y,90t/data=!3m8!1e2!3m6!1sGVbB9UxNM9IAAAQJOPKFTw!2e0!3e3!6s%2F%2Flh4.googleusercontent.com%2Fproxy%2FDrFp_HpXLr0ogLxmuCusDl45UIwKRV1XTZLC5RrIoj9yfSXmvwhrbOi5m905YxYYQ7hraGkCU3-LD_YWRbhhcQVnisirddS5DQwYyCbK9_16PWSJkdnYLTV0cWbzVwxy-38hTI49l45ayScZvxdtp12eH68ShngxT8eRb22Bc73r%3Dw114-h86-k-no!7i2133!8i1600!4m8!1m2!2m1!1shardware+store!3m4!1s0x30e29f09999c94e7:0x35164f4bbc97a0c7!8m2!3d13.7191094!4d100.5640736 Link to comment Share on other sites More sharing options...
Artisi Posted August 17, 2021 Share Posted August 17, 2021 (edited) Don't really understand your question, are you screwing into a threaded item or is it a thru' hole? If the OD you are measuring is 4mm it's a 4mm thread of either 0.5 or 0.7 pitch, although I would expect the diameter to be slightly less than 4mm ie. 3.97 - 3.85 OD. Many thread charts on the net for accurate detail. Edited August 17, 2021 by Artisi Link to comment Share on other sites More sharing options...
impulse Posted August 17, 2021 Share Posted August 17, 2021 https://www.lazada.co.th/products/winton-thread-gauge-mminch-i561610992-s1030340230 https://www.lazada.co.th/products/apex-whitworth-metric-52-i1569900465-s4232886439 They're also available on Lazada from China for less than 30 baht... https://journeymans-workshop.uk/isometric.php Link to comment Share on other sites More sharing options...
Kenny202 Posted August 18, 2021 Author Share Posted August 18, 2021 I have since got advice that they are a standard 4mm screw, actually for a guitar. They have a special head on them, knurled knob for turning by hand. I managed to source some off Ali express. Thanks for all the replies Link to comment Share on other sites More sharing options...
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