A tension spring pulls rather than pushes, and the 199 springs on this shelf all share one design advantage over the common kind: the turnable bolt end. Instead of a fixed hook, each spring ends in a threaded bolt that turns independently of the coil body, so the spring anchors to a tapped hole or a through-bolt and its working tension fine-tunes in place by turning the bolt, with no twisting fed into the spring body during fitting and no hook left to spread slowly open under load.
The pick is two dimensions: outside diameter and free length. The spring bodies run 18, 23 and 32 millimetres in outside diameter across the shelf, and within each diameter the free lengths step evenly, the 18 millimetre family from 120 through 150, 180, 210, 240 and 270 millimetres, the larger bodies stepping their own runs up to 290, so the fixed mounting distance and the pull wanted between the two anchors pick the spring together.
The turnable bolt is why these springs serve machine duty: hooks are the weak end of an ordinary extension spring, the first part to stretch open and the first to let go under a shock load, and the bolted end replaces that failure point with a thread, which also means a worn spring swaps out without disturbing either of its anchors.
Diameter and length typed into search find the spring at once, a worn one measured across and along its coil matches directly, and a photo with a rule laid alongside over WhatsApp on 07754288583 comes back with the size named and the nearest length steps offered honestly where the exact measurement falls between the listed springs.
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 5 mm |
| Outside Diameter (OD) | 30 mm |
| Free Length (FL) | 170 mm |
| Extended Length (EL) | 229 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 5 mm |
| Outside Diameter (OD) | 30 mm |
| Free Length (FL) | 200 mm |
| Extended Length (EL) | 274 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3,5 mm |
| Outside Diameter (OD) | 32 mm |
| Free Length (FL) | 260 mm |
| Extended Length (EL) | 557 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3,5 mm |
| Outside Diameter (OD) | 32 mm |
| Free Length (FL) | 230 mm |
| Extended Length (EL) | 478 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3,5 mm |
| Outside Diameter (OD) | 22 mm |
| Free Length (FL) | 290 mm |
| Extended Length (EL) | 422 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3 mm |
| Outside Diameter (OD) | 28 mm |
| Free Length (FL) | 270 mm |
| Extended Length (EL) | 632 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 5 mm |
| Outside Diameter (OD) | 30 mm |
| Free Length (FL) | 210 mm |
| Extended Length (EL) | 269 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 5 mm |
| Outside Diameter (OD) | 30 mm |
| Free Length (FL) | 240 mm |
| Extended Length (EL) | 314 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3,5 mm |
| Outside Diameter (OD) | 22 mm |
| Free Length (FL) | 255 mm |
| Extended Length (EL) | 387 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 5 mm |
| Outside Diameter (OD) | 35 mm |
| Free Length (FL) | 240 mm |
| Extended Length (EL) | 352 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 4 mm |
| Outside Diameter (OD) | 24 mm |
| Free Length (FL) | 240 mm |
| Extended Length (EL) | 329 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3,5 mm |
| Outside Diameter (OD) | 27 mm |
| Free Length (FL) | 255 mm |
| Extended Length (EL) | 478 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3,5 mm |
| Outside Diameter (OD) | 32 mm |
| Free Length (FL) | 195 mm |
| Extended Length (EL) | 443 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 4 mm |
| Outside Diameter (OD) | 24 mm |
| Free Length (FL) | 270 mm |
| Extended Length (EL) | 375 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3,5 mm |
| Outside Diameter (OD) | 32 mm |
| Free Length (FL) | 225 mm |
| Extended Length (EL) | 522 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3 mm |
| Outside Diameter (OD) | 23 mm |
| Free Length (FL) | 245 mm |
| Extended Length (EL) | 468 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3 mm |
| Outside Diameter (OD) | 28 mm |
| Free Length (FL) | 245 mm |
| Extended Length (EL) | 607 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 4 mm |
| Outside Diameter (OD) | 24 mm |
| Free Length (FL) | 205 mm |
| Extended Length (EL) | 294 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 4 mm |
| Outside Diameter (OD) | 30 mm |
| Free Length (FL) | 270 mm |
| Extended Length (EL) | 458 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 4 mm |
| Outside Diameter (OD) | 24 mm |
| Free Length (FL) | 235 mm |
| Extended Length (EL) | 340 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 4 mm |
| Outside Diameter (OD) | 30 mm |
| Free Length (FL) | 300 mm |
| Extended Length (EL) | 516 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 4 mm |
| Outside Diameter (OD) | 30 mm |
| Free Length (FL) | 265 mm |
| Extended Length (EL) | 481 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 4 mm |
| Outside Diameter (OD) | 35 mm |
| Free Length (FL) | 205 mm |
| Extended Length (EL) | 441 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 4 mm |
| Outside Diameter (OD) | 35 mm |
| Free Length (FL) | 235 mm |
| Extended Length (EL) | 512 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 5 mm |
| Outside Diameter (OD) | 30 mm |
| Free Length (FL) | 230 mm |
| Extended Length (EL) | 319 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 5 mm |
| Outside Diameter (OD) | 30 mm |
| Free Length (FL) | 260 mm |
| Extended Length (EL) | 364 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 4 mm |
| Outside Diameter (OD) | 35 mm |
| Free Length (FL) | 240 mm |
| Extended Length (EL) | 476 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 5 mm |
| Outside Diameter (OD) | 35 mm |
| Free Length (FL) | 170 mm |
| Extended Length (EL) | 260 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 5 mm |
| Outside Diameter (OD) | 35 mm |
| Free Length (FL) | 200 mm |
| Extended Length (EL) | 312 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 4 mm |
| Outside Diameter (OD) | 35 mm |
| Free Length (FL) | 270 mm |
| Extended Length (EL) | 547 mm |
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