Wrench question

[RMarchi]

What is the difference between a 731-A and a 1731-A wrench?

Thanks Rob

[d42jeep]

What is the difference between a 731-A and a 1731-A wrench?

Thanks Rob

Both have the same opening sizes. 3/4” x 7/8”. Different manufacturers used variations on the ISNs (Industry Standard Numbers).
http://alloy-artifacts.org/table_oe_wre ... size-table

http://alloy-artifacts.org/Photos/tools ... _inset.jpg

-Don

[Len Jones]

If it helps, a few more examples

Herbrand 1731-A
Barcalo Buffalo 731A
Fairmount Round 731-A
Fairmount Sharp 731A

Len

[Wingnutt]

1731-A is a model number that embeds the ISN (731-A) inside of it. Same is true of 1028-S, for example. The "28-S" is the ISN, the first two numbers are just filling out the 1000 or 1xxx series format of the model numbering system. There are 3731-A wrenches - and to extend the examples I've already used, 3028-S wrenches, as well. Some OEM's used those different prefixes to indicate steel composition, where a 1723 would be a 3/8 x 7/16 DOE engineers wrench made of alloy steel, but a 723 would be a 3/8 x 7/16 DOE engineers wrench made of carbon steel. Others used the prefix to distinguish types of wrenches (engineers, vs tappet, vs electrical) with the same openings.