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What bolt size to mount a B&S engine
#122112 10/01/26 09:51 PM
Joined: Nov 2025
Posts: 8
Melbourne, VIC
SuziRova
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Novice
What is the bolt size required to mount this B&S engine? I tried M10 and it's not quite right. M8 definitely too small. Is it some sort of SAE size or odd thread?

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Re: What bolt size to mount a B&S engine
SuziRova #122113 10/01/26 11:27 PM
Joined: Jan 2016
Posts: 8,176
Likes: 232
Melbourne
NormK Offline
SENIOR TECHNICIAN
They should be 3/8th UNC or you can get away with 3/8 Whit which is close
Re: What bolt size to mount a B&S engine
SuziRova #122114 12/01/26 08:30 AM
Joined: Jan 2015
Posts: 1,546
Likes: 24
Tennessee, USA
AVB Offline
SENIOR TECHNICIAN
If remember correct the Briggs are unthreaded to start with they are 3/8 holes that they use self tappers. So if the new and never had screws in it then you just tapped to which 3/8 course thread that is easily available in your area provide you have the correct tap.


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