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Power springs are flat-coiled constant-force springs wound from strip steel, used wherever a mechanism needs a controlled retract, rewind, or return under sustained load. The tape measure is the application most trade buyers recognise: the coiled blade is pulled out against the spring's resistance and snaps back cleanly when released. The same principle drives cable retractors, hose reels, seat-belt retractors, counterbalance arms, and a wide range of light-industrial assemblies where a consistent return force is needed across a long stroke.
Selecting a power spring comes down to four attributes: strip width, strip thickness, coil length (which determines the available travel), and the torque or force the spring delivers at working extension. Material matters too, and the search pattern "tape measure power spring material" reflects a common trade question: most power springs are hardened and tempered carbon steel, though stainless grades exist for wet or corrosive environments. PartsForMachines lists power springs as an Authorised Distributor and Seller, and each product page carries the specification data needed to match a spring to its application. Metrol is the manufacturer behind these power spring.
For replacement work, the original spring's dimensions should be measured before ordering: strip width and thickness are straightforward to caliper, and the free-coil diameter gives a reliable guide to the available travel. Springs in retractor assemblies often fatigue at the inner or outer tang before the strip itself fails, so checking tang condition at service is a sound habit.
For sizing queries or trade quantities, reach the PartsForMachines team via WhatsApp 07754288583 or email [email protected].
| 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 |
| A | 4 mm |
|---|---|
| B | 5 mm |
| ID | 70 mm |
| M1 | 124 N/mm |
| M2 | 503 N/mm |
| A | 4 mm |
|---|---|
| B | 5 mm |
| ID | 70 mm |
| M1 | 155 N/mm |
| M2 | 631 N/mm |
| A | 5 mm |
|---|---|
| B | 5 mm |
| ID | 85 mm |
| M1 | 143 N/mm |
| M2 | 588 N/mm |
| A | 5 mm |
|---|---|
| B | 5 mm |
| ID | 85 mm |
| M1 | 172 N/mm |
| M2 | 709 N/mm |
| A | 5 mm |
|---|---|
| B | 5 mm |
| ID | 85 mm |
| M1 | 216 N/mm |
| M2 | 891 N/mm |
| A | 3 mm |
|---|---|
| B | 4 mm |
| ID | 77 mm |
| M1 | 72 N/mm |
| M2 | 275 N/mm |
| A | 4 mm |
|---|---|
| B | 5 mm |
| ID | 97 mm |
| M1 | 97 N/mm |
| M2 | 417 N/mm |
| A | 4 mm |
|---|---|
| B | 5 mm |
| ID | 97 mm |
| M1 | 117 N/mm |
| M2 | 503 N/mm |
| Material | EN 10151 1.4310 |
|---|---|
| Material Thickness | 0,4 mm |
| Strip Width | 8 mm |
| Spring Diameter | 12 mm |
| Inside Loop Length (A) | 3 mm |
| A | 6 mm |
|---|---|
| B | 6 mm |
| ID | 100 mm |
| M1 | 287 N/mm |
| M2 | 1184 N/mm |
| A | 6 mm |
|---|---|
| B | 6 mm |
| ID | 100 mm |
| M1 | 228 N/mm |
| M2 | 942 N/mm |
| A | 4 mm |
|---|---|
| B | 5 mm |
| ID | 97 mm |
| M1 | 147 N/mm |
| M2 | 631 N/mm |
| A | 6 mm |
|---|---|
| B | 6 mm |
| ID | 100 mm |
| M1 | 384 N/mm |
| M2 | 1589 N/mm |
| A | 7 mm |
|---|---|
| B | 6 mm |
| ID | 115 mm |
| M1 | 292 N/mm |
| M2 | 1205 N/mm |
| A | 5 mm |
|---|---|
| B | 5 mm |
| ID | 116 mm |
| M1 | 127 N/mm |
| M2 | 588 N/mm |
| A | 5 mm |
|---|---|
| B | 5 mm |
| ID | 116 mm |
| M1 | 153 N/mm |
| M2 | 709 N/mm |
| A | 7 mm |
|---|---|
| B | 6 mm |
| ID | 115 mm |
| M1 | 368 N/mm |
| M2 | 1516 N/mm |
| A | 5 mm |
|---|---|
| B | 5 mm |
| ID | 116 mm |
| M1 | 192 N/mm |
| M2 | 891 N/mm |
| A | 7 mm |
|---|---|
| B | 6 mm |
| ID | 115 mm |
| M1 | 494 N/mm |
| M2 | 2036 N/mm |
| A | 6 mm |
|---|---|
| B | 6 mm |
| ID | 136 mm |
| M1 | 232 N/mm |
| M2 | 1184 N/mm |
| A | 7 mm |
|---|---|
| B | 6 mm |
| ID | 157 mm |
| M1 | 243 N/mm |
| M2 | 1205 N/mm |
| A | 8 mm |
|---|---|
| B | 8 mm |
| ID | 145 mm |
| M1 | 570 N/mm |
| M2 | 2312 N/mm |
| A | 6 mm |
|---|---|
| B | 6 mm |
| ID | 136 mm |
| M1 | 311 N/mm |
| M2 | 1589 N/mm |
| A | 8 mm |
|---|---|
| B | 8 mm |
| ID | 145 mm |
| M1 | 766 N/mm |
| M2 | 3110 N/mm |
| A | 7 mm |
|---|---|
| B | 6 mm |
| ID | 157 mm |
| M1 | 306 N/mm |
| M2 | 1516 N/mm |
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