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Maryland Metrics
Screw Size to Key Size
Selection/Interchangeability Table


Hex Size
Metric sized keys set screws shoulder
screws
DIN 7984 DIN 906
fine thd.
DIN 908
fine thd.
0.71 mm - - - M1.4, M1.6, M1.8 - -    
0.89 mm - - - M2 - -    
1.27 mm M1.4 - - M3 - -    
1.5 mm M1.6, M2 - - M3 - -    
2 mm M2.5 M3 M3 M4 - M3    
2.5 mm M3 M4 M4 M5 - M4    
3 mm M4 M5 M5 M6 M5 M5    
4 mm M5 M6 M6 M8 M6 M6 M8  
5 mm M6 M8 M8 M10 M8 M8 M10, R1/8 G1/8
6 mm M8 M10 M10 M12, M14 M10 - M12 M12, M14, G1/4
7 mm - - - - - M10 M14, R1/4  
8 mm M10 M12 M12 M16 M12 M12 M16, M18, R3/8 M16, M18, G3/8
10 mm M12 M14, M16 M14, M16 M18, M20 M16 M14 M20, M22, R1/2 M20, M22, G1/2
12 mm M14 M18, M20 M18, M20 M22, M24 M20 M16, M18 M24, M26, R3/4 M24, M26, G3/4
14 mm M16, M18 M22, M24 M22, M24 - - M20, M22    
17 mm M20, M22 - - - - M24 M30, M33, R1 M30, M33, G1
19 mm M24, M27 - - - - - M36 M36, M39
22 mm M30 - - - - - R1 1/4 M42, G1 1/4
24 mm M33 - - - - - R1 1/2 M48, G1 1/2
27 mm M36, M39 - - - - - - -
30 mm - - - - - - - -
32 mm M42 - - - - - - -
36 mm M48 - - - - - - -
Inch sized keys                
.028" - - - #0 - - - -
.035" - - - #1, #2 - - - -
.050" #0 #1, #2 #1, #2 #3, #4 - - - -
1/16" #1 #3, #4 #3, #4 #5, #6 - - - -
5/64" #2, #3 #5, #6 #5, #6 #8 - - - -
3/32" #4, #5 #8 #8 #10 - - - -
7/64" #6 - - - - - - -
1/8" - #10 #10 1/4'' 1/4'' - - -
9/64" #8 - - - - - - -
5/32" #10 1/4'' 1/4'' 5/16'' 5/16'' - - -
3/16" 1/4'' 5/16'' 5/16'' 3/8'' 3/8'' - - -
7/32" - 3/8'' 3/8'' 7/16'' - - - -
1/4" 5/16'' 7/16'' - 1/2'' 1/2'' - - -
5/16" 3/8'' 1/2'' 1/2'' 5/8'' 5/8'' - - -
3/8" 7/16", 1/2" 5/8'' 5/8'' 3/4'' 3/4'' - - -
7/16" 9/16'' - - - - - - -
1/2" 5/8'' 3/4'' - 7/8'' 1" - - -
9/16" - - - 1", 1 1/8" - - - -
5/8" 3/4'' - - 1 1/4", 1 3/8" 1 1/4'' - - -
3/4" 7/8", 1" - - 1 1/2'' - - - -

Star Size
Star Size set screws shoulder
screws
DIN 7984 DIN 906
fine thd.
DIN 908
fine thd.
T6 - - - M3 - - - -
T7 - - #4 #6 - - - -
T8 - - - #8, M4 - - - -
T9 - #4 - - - - - -
T10 #4, #5, M3 #5, M3 #6, M3 #10, M5 - M3 - -
T15 #6 #6 #8 - - - - -
T20 - #8, M4 M4 1/4", M6 - M4 - -
T25 #8, M4 #10, M5 #10, M5 - - M5 - -
T27 #10, M5 - 1/4'' 5/16", M8 - - - -
T30 1/4", M6 1/4", M6 M6 3/8'' - M6 - -
T40 - 5/16", M8 5/16", M8 M10 - M8 - -
T45 5/16", M8 3/8'' 3/8'' 1/2", M12 - - - -
T50 3/8", M10 7/16", 1/2", M10 M10 M14 - - - -
T55 7/16", 1/2", M12 5/8", M12 1/2", M12 M16 - - - -
T60 M14 3/4", M16 5/8", M16 M20 - - - -
Note: Star size is generally interchangeable with other drives such as TORX®, 6 lobe

Some data provided by Bondhus Corporation

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