| GRIP | MAXIMUM OPERATING FORCE lb. (kg-f) | MIN/MAX CROSS SECTION In. (mm) CS | MINIMUM GRIP LENGTH In. (mm) L | MINIMUM GRASP SPACE In. (mm) a,b,c |
| POWER PULL/PUSH | 7 (3.1) | 0.5 (12) TO |
5.3 (135) | a: 2.8 (70) |
| ROTATE (CRANKS) | 2 (0.7) | 1.7 (43) | NA | b: 1.4 (36) |
| DISC | 3 (1.5) | 20 (50) TO 2.8 (72) |
0.8 (20)b | a: 2.0 (50) b: 1.8 (46) |
| SPAN | 3 (1.5) | 2.1 (54) MAX | 0.9 (23)b | a: 2.8 (72) b:1.4 (36) |
| HOOKa | 11 (5.2) | 2.1 (54) MAX | 3.5 (88) | a: 2.7 (69) b: 1.4 (36) |
| PINCH | 4 (1.8) | 0.1 (3) TO 1.2 (31) |
1.0 (25) b | a: 6.2 (158) b: 2.5 (64)d c: 4.0 (101)e |
| FINGER PUSHa | 3 (1.5) 0.2 (0.1) |
NA NA |
0.8 (20)b NONE |
0.7 (18)b 0.7 (18)b |
| FLAT HAND PUSHa | 8 (3.6) | NA | a: 7.7 (196) b:3.5 (88) |
a: 7.7 (196)g b:6.6 (167)h |
NOTE:Original measurements taken in metric and converted to English units. Pounds were rounded to the nearest whole number where
possible.
aPreferred for all devices; required for handles. bBased on anthropometric data for population at large (see
Diffrient, et al., Humanscale)
ca: grip clearances; b:finger clearance. dClearance
for thumb. eWidth of fist. fIf practically no force is required an area can be very small with practically no impact on usability.
gVerticle clearance. hHorizontal clearance.