Speedmaster 3861 Bracelet Screwdriver Size: 1.8mm

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labtec

·Jan 26, 2026

Hello everyone,

Can someone confirm the correct screwdriver size for adjusting a 3861 bracelet?

I've done some research but I'm still unsure because sometimes it says 1.4mm and sometimes 1.8mm.

Thanks everyone!

 

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josiahg52

·Jan 26, 2026

1.4mm works perfectly fine, 1.8mm is the exact size.

 

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labtec

·Jan 26, 2026

Thank you! I'll buy a 1.8 mm screwdriver 👍

 

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josiahg52

·Jan 26, 2026

Don't skimp. I like Wiha but Wera is good also. I bought a handle with several exchangeable Phillips and slotted bits and at least one bit has fit every bracelet I've needed to resize.

 

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Lug

·Jan 26, 2026

I use one of those little screwdrivers you can buy in the opticians for your glasses. Works perfectly and cost about £5.

 

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labtec

·Jan 27, 2026

I ordered a Wera! Thanks again 👍

 

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Evitzee

·Jan 27, 2026

If you have a 1.5 mm and 1.8 mm you will be covered for almost all conditions. I use Wiha, good quality at reasonable price.

Edited: Jan 28, 2026