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) | 6 mm |
| Outside Diameter (OD) | 36 mm |
| Free Length (FL) | 220 mm |
| Extended Length (EL) | 295 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 6 mm |
| Outside Diameter (OD) | 42 mm |
| Free Length (FL) | 160 mm |
| Extended Length (EL) | 231 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 5 mm |
| Outside Diameter (OD) | 40 mm |
| Free Length (FL) | 300 mm |
| Extended Length (EL) | 519 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 6 mm |
| Outside Diameter (OD) | 36 mm |
| Free Length (FL) | 300 mm |
| Extended Length (EL) | 390 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 6 mm |
| Outside Diameter (OD) | 42 mm |
| Free Length (FL) | 270 mm |
| Extended Length (EL) | 384 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 6 mm |
| Outside Diameter (OD) | 42 mm |
| Free Length (FL) | 300 mm |
| Extended Length (EL) | 435 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 5 mm |
| Outside Diameter (OD) | 40 mm |
| Free Length (FL) | 230 mm |
| Extended Length (EL) | 418 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 5 mm |
| Outside Diameter (OD) | 40 mm |
| Free Length (FL) | 260 mm |
| Extended Length (EL) | 479 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 6 mm |
| Outside Diameter (OD) | 42 mm |
| Free Length (FL) | 190 mm |
| Extended Length (EL) | 282 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 6 mm |
| Outside Diameter (OD) | 42 mm |
| Free Length (FL) | 160 mm |
| Extended Length (EL) | 231 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 5 mm |
| Outside Diameter (OD) | 40 mm |
| Free Length (FL) | 330 mm |
| Extended Length (EL) | 581 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 6 mm |
| Outside Diameter (OD) | 36 mm |
| Free Length (FL) | 330 mm |
| Extended Length (EL) | 434 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 5 mm |
| Outside Diameter (OD) | 40 mm |
| Free Length (FL) | 290 mm |
| Extended Length (EL) | 541 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 6 mm |
| Outside Diameter (OD) | 36 mm |
| Free Length (FL) | 250 mm |
| Extended Length (EL) | 340 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 6 mm |
| Outside Diameter (OD) | 36 mm |
| Free Length (FL) | 280 mm |
| Extended Length (EL) | 384 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 6 mm |
| Outside Diameter (OD) | 36 mm |
| Free Length (FL) | 360 mm |
| Extended Length (EL) | 478 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 6 mm |
| Outside Diameter (OD) | 42 mm |
| Free Length (FL) | 250 mm |
| Extended Length (EL) | 385 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 6 mm |
| Outside Diameter (OD) | 42 mm |
| Free Length (FL) | 280 mm |
| Extended Length (EL) | 437 mm |
| Material | EN 10270-1-SH |
|---|---|
| Wire Diameter (WD) | 6 mm |
| Outside Diameter (OD) | 36 mm |
| Free Length (FL) | 310 mm |
| Extended Length (EL) | 428 mm |
By sharing your email, you agree to our privacy policy & terms of service