Left Hand Coil Spring

For compression and extension springs.

Left hand coil spring.

If you are screwing a compression spring onto a mating part you would want the coil direction to matc h that of the threads. If the direction of the coil from top to bottom can be simulated by bending the index finger of the left hand the coil is left hand wound. Pick up the spring and look into it. Right hand wound rhw vs left hand wound lhw.

If the last coil of the spring points in the same direction of your fingers then you are looking at the right handed spring. If it s in the 3 o clock position the spring is right hand wound. Compression springs can be left or right hand coiled. In the us most screws are right hand.

The direction of the spring wind can be easily determined by holding it in hand. If the wire is jutting out at the 9 o clock. In applications such as one spring operating inside an other it is necessary to coil the springs so that the helices are in opposite directions right and left. To determine the compression spring coil direction hold the compression spring with its axis on a horizontal plane.

If the last coil ends in the same direction that your fingers are pointing that is the hand direction of wind of the spring. The direction of wind of a spring can be determined by simply holding it in your hand with your fingers placed around the outside of the body and your thumb pointing straight up. If it can be. The fingers should be placed on the outside of the body and your thumb should point upwards.

Sometimes though you wouldn t want the pitch of the spring to get caught up in the pitch of the threaded mating part.