oil pump mount bolt

[hotstuff1143]

Can anyone tell me what size is the mount bolt for the oil pump to block is
Would like to know size pitch and how long it is.
Thank for any help Oh this is for a 1937 ford 21 stud flathead

 

[Ronnieroadster]

The bolt is 5/16 coarse thread length is 3/4 of an inch. The head is usually drilled so safety wire can be used. A good quality lock washer can be used if the head of the bolt is not drilled for safety wire.
Ronnieroadster