| Answer | Crossword Clue |
|---|---|
| keying | secure (as a pulley on a shaft) by a key |
| splined | rectangular key that fits in ridges on a shaft so as to transmit torque, or the ridges themselves |
| spline | rectangular key that fits in ridges on a shaft so as to transmit torque, or the ridges themselves |
| keystroke | one stroke of any key on a machine operated by a keyboard, as a typewriter, computer terminal, or Linotype |
