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Clock Springs

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The coils of a clock spring are formed by winding spring wire around a cylinder into helically shaped metal springs. There are two coil types for clock springs: tight coils and open coils. Clock springs with tight coils are, in normal applications, completely without friction. Tight coil clock springs are often used as locking mechanisms. Read More…

Clock Springs Clock springs, or power springs, are helically wound springs that are naturally inclined to expand; the expansion generates torque, or circular movement. However, once the expansion occurs and the spiral length has run out, the clock spring must be rewound.
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Leading Manufacturers

Lake Geneva, WI  |  262-249-7854

R&L Spring Company manufactures custom spring and wire formed components for industries such as powersports, automotive, medical devices, and general industrial. Products include compression, extension, and torsion springs, as well as rings, wire forms, fourslide components, and long coils. Wire diameters available from .001" to .750" in both shaped wires and flat stocks. Their experienced team is able to meet the most demanding parts specifications. IATF16949 and ISO9001 certified.

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R & L Spring Company $$$

Santa Clara, CA  |  408-986-1020

Since 1979, our springs & metal parts have been manufactured for the aerospace, electronic instruments, & medical industries. The torsion springs, compression springs, extension springs, flat springs, & leaf springs that American Precision Spring Corporation offers are used by customers worldwide.

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American Precision Spring Corporation $$$

Grand Rapids, MI  |  616-453-5463

Certified ISO 9001:2000 company, Apex Spring & Stamping, is a top manufacturer of springs. Coil springs manufactured: torsion, extension or specialty springs. Flat stock is of spring steel, aluminum, stainless, brass, copper or rolled steel. Since 1977, our goal has been customer satisfaction. We will provide products that meet or exceed our customers expectations that are delivered on time.

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Apex Spring & Stamping Corporation $$$

Minneapolis, MN  |  800-473-8837

Quickdraw Conveyor Systems are specially designed for use in automation processes. Our flexible design is ideal for conveyance in clean-room environments, automotive component assembly, medical device and instrument assembly, microelectronics production and semiconductor applications.

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Activar Technical Products/Quickdraw $$$

McKees Rocks, PA  |  800-245-6200

Quickdraw Conveyor Systems are specially designed for use in automation processes. Our flexible design is ideal for conveyance in clean-room environments, automotive component assembly, medical device and instrument assembly, microelectronics production and semiconductor applications.

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General Wire Spring Company $$$
placeholder image R & L Spring Company American Precision Spring Corporation Apex Spring & Stamping Corporation Activar Technical Products/Quickdraw General Wire Spring Company

Clock springs with open coils are the most common type and must be mounted in housings. Open coil clock springs offer a low increase of force and are often used in applications such as retractable reels, retracting seat belts, mechanical motors, tape measures, timing devices, vehicle suspensions, galvanometers and electrical switches.

Typical industries that utilize clock springs include military, medical, automotive, electronics, agricultural, commercial, industrial and utilities. Clock springs are most commonly made from a certain type of spring steel referred to as either blue steel or clock spring steel. Blue steel is tempered and polished spring steel, which has a very high carbon content and is generally dark blue in color.

Small Clock Springs Clock Springs - All-Rite Spring Company

Clock springs consist of a flat coil strip and are wound, either tightly or openly, similar to a snail shell in that each coil is nested within a larger coil. Flat coil strips provide a stronger spring than round wire, although round wire is more commonly used in springs. Often, clock springs are wound and mounted on an arbor, which is a piece of round stock that has one end formed to accept the inside end of the clock spring, while the outside end is attached to a stationary post.

The power spring is also housed within a cylindrical casing, or barrel. The clock spring is wound by turning the arbor, but it drives the object’s movement by the barrel; this arrangement allows the clock spring to continue powering the object while it is being wound. Winding the object turns the arbor, which tightens the clock spring, wrapping it closer around the arbor.

Clock springs are most commonly formed through the cold rolling process. A type of roll forming, cold rolling utilizes roll forming machines, which consist of sequences of calenders, or roller die pairs, positioned both above and below the metal coil that is being formed. As the metal moves through the machine, the rollers bend the material along the linear axis, pressing the metal into a more uniform grain flow while shaping the metal into flat coil strips.

Cold rolled clock springs are created at temperatures below the recrystallization point of the metal. The cold rolling process increases the tensile strength of the metal. The clock springs are then annealed, or made softer through heating, so that they can be wound or coiled. Next, the clock spring is heat treated in order to reduce stresses and fractures and thus further strengthen the spring.

Clock Springs Informational Video