A clock spring is force wound flat: a coiled steel strip that stores torque as it winds and gives it back turn by turn as it unwinds, the hidden working spring behind recoil starters, retracting hose and cable reels, counterbalances and return mechanisms of every kind, and the 80 power springs on this shelf are graded the way flat springs always have been graded, by the thickness of the strip itself.
Thickness is the force in a flat spring: the gauges step from 0.4 millimetres upward through 0.5 and 0.6, and a thicker strip in the same coil delivers more torque across the same turns, so the mechanism's demand picks the gauge while the housing it winds inside fixes the coil's dimensions. Within each gauge the range carries several coil sizes, which is why matching runs strip-first, the thickness measured off the old spring with a micrometer or read straight from its listing code.
The failure mode is the whole reason for the shelf: a flat spring cracks at its ends or loses its set after years of daily winding, and the mechanism goes limp, a petrol starter that will not recoil, a reel that stops retracting its hose, a counterbalance that slowly sags out of setting. The spring replaces for pennies against the cost of the mechanism; the mechanism itself lives on and does not need to.
The thickness typed into search narrows the shelf at once, and the old spring, measured for strip thickness and width with a micrometer and photographed coiled over WhatsApp on 07754288583, comes back with the power spring named, the coil matched and the wind direction confirmed before it ships.
| A | 7 mm |
|---|---|
| B | 2,5 mm |
| C | 2,7 mm |
| D | 3,5 mm |
| Material | EN 10270-3-1.4310 |
| A | 7 mm |
|---|---|
| B | 2,5 mm |
| C | 2,7 mm |
| D | 3,5 mm |
| Material | EN 10270-3-1.4310 |
| A | 10 mm |
|---|---|
| B | 3,5 mm |
| C | 3,7 mm |
| D | 5 mm |
| Material | EN 10270-3-1.4310 |
| A | 8 mm |
|---|---|
| B | 3 mm |
| C | 3,2 mm |
| D | 4,5 mm |
| Material | EN 10270-3-1.4310 |
| A | 8 mm |
|---|---|
| B | 3 mm |
| C | 3,2 mm |
| D | 4,5 mm |
| Material | EN 10270-3-1.4310 |
| A | 10 mm |
|---|---|
| B | 3,5 mm |
| C | 3,7 mm |
| D | 5 mm |
| Material | EN 10270-3-1.4310 |
| A | 12 mm |
|---|---|
| B | 4,5 mm |
| C | 4,2 mm |
| D | 6 mm |
| Material | EN 10270-3-1.4310 |
| A | 7 mm |
|---|---|
| B | 2,5 mm |
| C | 2,7 mm |
| D | 3,5 mm |
| Material | EN 10270-3-1.4310 |
| A | 7 mm |
|---|---|
| B | 2,5 mm |
| C | 2,7 mm |
| D | 3,5 mm |
| Material | EN 10270-3-1.4310 |
| A | 12 mm |
|---|---|
| B | 4,5 mm |
| C | 4,2 mm |
| D | 6 mm |
| Material | EN 10270-3-1.4310 |
| A | 10 mm |
|---|---|
| B | 3,5 mm |
| C | 3,7 mm |
| D | 5 mm |
| Material | EN 10270-3-1.4310 |
| A | 8 mm |
|---|---|
| B | 3 mm |
| C | 3,2 mm |
| D | 4,5 mm |
| Material | EN 10270-3-1.4310 |
| A | 10 mm |
|---|---|
| B | 3,5 mm |
| C | 3,7 mm |
| D | 5 mm |
| Material | EN 10270-3-1.4310 |
| A | 8 mm |
|---|---|
| B | 3 mm |
| C | 3,2 mm |
| D | 4,5 mm |
| Material | EN 10270-3-1.4310 |
| A | 14 mm |
|---|---|
| B | 5 mm |
| C | 5,2 mm |
| D | 7 mm |
| Material | EN 10270-3-1.4310 |
| A | 14 mm |
|---|---|
| B | 5 mm |
| C | 5,2 mm |
| D | 7 mm |
| Material | EN 10270-3-1.4310 |
| A | 12 mm |
|---|---|
| B | 4,5 mm |
| C | 4,2 mm |
| D | 6 mm |
| Material | EN 10270-3-1.4310 |
| A | 12 mm |
|---|---|
| B | 4,5 mm |
| C | 4,2 mm |
| D | 6 mm |
| Material | EN 10270-3-1.4310 |
| A | 16 mm |
|---|---|
| B | 6 mm |
| C | 6,3 mm |
| D | 9 mm |
| Material | EN 10270-3-1.4310 |
| A | 16 mm |
|---|---|
| B | 6 mm |
| C | 6,3 mm |
| D | 9 mm |
| Material | EN 10270-3-1.4310 |
| A | 20 mm |
|---|---|
| B | 7 mm |
| C | 6,3 mm |
| D | 9 mm |
| Material | EN 10270-3-1.4310 |
| A | 14 mm |
|---|---|
| B | 5 mm |
| C | 5,2 mm |
| D | 7 mm |
| Material | EN 10270-3-1.4310 |
| A | 14 mm |
|---|---|
| B | 5 mm |
| C | 5,2 mm |
| D | 7 mm |
| Material | EN 10270-3-1.4310 |
| A | 20 mm |
|---|---|
| B | 7 mm |
| C | 6,3 mm |
| D | 9 mm |
| Material | EN 10270-3-1.4310 |
| A | 16 mm |
|---|---|
| B | 6 mm |
| C | 6,3 mm |
| D | 9 mm |
| Material | EN 10270-3-1.4310 |
| A | 16 mm |
|---|---|
| B | 6 mm |
| C | 6,3 mm |
| D | 9 mm |
| Material | EN 10270-3-1.4310 |
| A | 20 mm |
|---|---|
| B | 7 mm |
| C | 6,3 mm |
| D | 9 mm |
| Material | EN 10270-3-1.4310 |
| A | 3 mm |
|---|---|
| B | 4 mm |
| ID | 55 mm |
| M1 | 66 N/mm |
| M2 | 275 N/mm |
| A | 3 mm |
|---|---|
| B | 4 mm |
| ID | 55 mm |
| M1 | 52 N/mm |
| M2 | 219 N/mm |
| A | 4 mm |
|---|---|
| B | 5 mm |
| ID | 70 mm |
| M1 | 103 N/mm |
| M2 | 417 N/mm |
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