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) | 3 mm |
| Outside Diameter (OD) | 18 mm |
| Free Length (FL) | 155 mm |
| Extended Length (EL) | 224 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 2,5 mm |
| Outside Diameter (OD) | 17 mm |
| Free Length (FL) | 230 mm |
| Extended Length (EL) | 367 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3 mm |
| Outside Diameter (OD) | 23 mm |
| Free Length (FL) | 210 mm |
| Extended Length (EL) | 372 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 2,5 mm |
| Outside Diameter (OD) | 24 mm |
| Free Length (FL) | 115 mm |
| Extended Length (EL) | 274 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3 mm |
| Outside Diameter (OD) | 23 mm |
| Free Length (FL) | 155 mm |
| Extended Length (EL) | 286 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 2,5 mm |
| Outside Diameter (OD) | 20 mm |
| Free Length (FL) | 175 mm |
| Extended Length (EL) | 347 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 2,5 mm |
| Outside Diameter (OD) | 24 mm |
| Free Length (FL) | 170 mm |
| Extended Length (EL) | 385 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 2,5 mm |
| Outside Diameter (OD) | 17 mm |
| Free Length (FL) | 175 mm |
| Extended Length (EL) | 289 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3 mm |
| Outside Diameter (OD) | 18 mm |
| Free Length (FL) | 125 mm |
| Extended Length (EL) | 177 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 2,5 mm |
| Outside Diameter (OD) | 17 mm |
| Free Length (FL) | 205 mm |
| Extended Length (EL) | 342 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3 mm |
| Outside Diameter (OD) | 18 mm |
| Free Length (FL) | 150 mm |
| Extended Length (EL) | 202 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3,5 mm |
| Outside Diameter (OD) | 27 mm |
| Free Length (FL) | 140 mm |
| Extended Length (EL) | 213 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 2,5 mm |
| Outside Diameter (OD) | 20 mm |
| Free Length (FL) | 260 mm |
| Extended Length (EL) | 504 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 2,5 mm |
| Outside Diameter (OD) | 20 mm |
| Free Length (FL) | 230 mm |
| Extended Length (EL) | 438 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3 mm |
| Outside Diameter (OD) | 23 mm |
| Free Length (FL) | 125 mm |
| Extended Length (EL) | 223 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3 mm |
| Outside Diameter (OD) | 28 mm |
| Free Length (FL) | 180 mm |
| Extended Length (EL) | 393 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3,5 mm |
| Outside Diameter (OD) | 32 mm |
| Free Length (FL) | 105 mm |
| Extended Length (EL) | 216 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 4 mm |
| Outside Diameter (OD) | 24 mm |
| Free Length (FL) | 115 mm |
| Extended Length (EL) | 158 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 4 mm |
| Outside Diameter (OD) | 30 mm |
| Free Length (FL) | 115 mm |
| Extended Length (EL) | 191 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3,5 mm |
| Outside Diameter (OD) | 27 mm |
| Free Length (FL) | 135 mm |
| Extended Length (EL) | 238 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3,5 mm |
| Outside Diameter (OD) | 22 mm |
| Free Length (FL) | 135 mm |
| Extended Length (EL) | 196 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 2,5 mm |
| Outside Diameter (OD) | 20 mm |
| Free Length (FL) | 235 mm |
| Extended Length (EL) | 479 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 2,5 mm |
| Outside Diameter (OD) | 24 mm |
| Free Length (FL) | 205 mm |
| Extended Length (EL) | 533 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 4 mm |
| Outside Diameter (OD) | 24 mm |
| Free Length (FL) | 150 mm |
| Extended Length (EL) | 193 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3 mm |
| Outside Diameter (OD) | 28 mm |
| Free Length (FL) | 155 mm |
| Extended Length (EL) | 368 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3 mm |
| Outside Diameter (OD) | 23 mm |
| Free Length (FL) | 180 mm |
| Extended Length (EL) | 311 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3 mm |
| Outside Diameter (OD) | 18 mm |
| Free Length (FL) | 210 mm |
| Extended Length (EL) | 296 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3,5 mm |
| Outside Diameter (OD) | 27 mm |
| Free Length (FL) | 165 mm |
| Extended Length (EL) | 298 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 3,5 mm |
| Outside Diameter (OD) | 22 mm |
| Free Length (FL) | 165 mm |
| Extended Length (EL) | 243 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 2,5 mm |
| Outside Diameter (OD) | 17 mm |
| Free Length (FL) | 235 mm |
| Extended Length (EL) | 396 mm |
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