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Maryland Metrics Technical Data Chart:
Squares for Operating Spindles and Operating Parts
to DIN 79 extract

Type A Shaft square      Type I bore square
s d e1 e1 e2
H11/h11 max.* max. min.** min.
4 4.2 5 4.8 5.3
5 5.3 6.5 6 6.6
5.5 5.8 7 6.6 7.2
6 6.3 8 7.2 8.1
7 7.3 9 8.4 9.1
8 8.4 10 9.6 10.1
9 9.5 12 10.8 12.1
10 10.5 13 12 13.1
11 11.6 14 13.2 14.1
12 12.6 16 14.4 16.1
13 13.7 17 15.6 17.1
14 14.7 18 16.8 18.1
16 16.8 21 19.2 21.2
17 17.9 22 20.4 22.2
19 20 25 22.8 25.2
22 23.1 28 26.4 28.2
24 25.3 32 28.8 32.2
27 28.4 36 32.4 36.2
30 31.7 40 36 40.2
32 33.7 42 38.4 42.2
36 38 48 43.3 48.2
41 43.2 54 49.3 54.2
46 48.5 60 55.2 60.2
50 52.7 65 60 65.2
55 57.9 72 66 72.2
* Internal squares are allowed to be recessed (relieved) in the middle third of each side.
'd max' defines the recommended bore hole diameter which leaves an appropriate clearance when
positioned concentrically to the internal square.

** External squares made on round steel bar may fall below the minimum size by the amount of
tolerance on the steel bar, i.e. by h11.
all dimensions in mm

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