Helpful guide to the Metric to Fractional Interchange with today’s most popular sizes.
This winter are you planning on assembling an on-board tool kit for your Perkins marine engine? Or maybe a field service kit for your Deutz in a screening plant? Here’s a way to save time, weight, space, and money: use selected standard sizes and metric size sockets interchangeably.
Listed below are common interchanges that are safe to use and will insure a snug fit. As a precaution, try not to exceed 5 thousandths difference in size to avoid rounded-off head bolts.
|
Standard Fractional Size |
Metric Size |
Difference in Thousandths |
|
15/64 |
6 |
.002 |
|
5/16 |
8 |
.003 |
|
7/16 |
11 |
.004 |
|
5/8 |
16 |
.005 |
|
3/4 |
19 |
.006 |
Written by Dr. Diesel
Knowledge is power. To help our customers, we share tech tips summarizing some of our opinions, knowledge and information of interest that we have gathered since 1916 when Foley Engines opened for business. If you have any questions or comments, go to “Ask Dr. Diesel™” where you can pose questions about engines, clutches, exhaust scrubbers, etc.
