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Standards for T-slots

T-slots come in standard sizes. Needless to say things designed to fit in the T-slots are designed to fit these standard sizes. Similarly, the cutters designed for cutting T-slot are designed to cut standard size T-slots.

fig outline of a T-slot

The key characteristic of a T-slot is its width. Of course this can be metric or imperial

Metric T-slots (all in millimeters)

A              b                 B+          C            C+         Hmin        Hmax

6             11              +1.5          5             +1           13           11

8             14.5          +1.5           7             +1           18          15

10           16              +2             7             +1            21          17

12           19              +2             8             +1            25          20

Imperial T-slots (All in inches)

diam of  bolt         width of slot       depth of throatmax

A

1/4                        9/32                              3/8                     1/8    9/16               1/2                   15/64         13/64

5/16                     11/32                           7/16                                  5/32   21/32         19/32

3/8                       7/16

1/2                      9/16

5/8                     11/16

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