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spring-9.25x33mm.md

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:::success :handshake: Please contribute by directly editing and/or commenting! ::: :::danger Images need to be redrawn and placed under a suitable license (CC BY-SA). :::

spring-9.25x33mm Compression spring

![](https://i.imgur.com/YdljRfv.png =x60) 🔗

properties (full spec)

:::info the following information fully specifies the part :::

  • length (L0): 33mm
  • OD (De): 9.25mm
  • wire diameter (d): 1.25mm
  • spring rate (R,k): ~ 5.8 $\frac{N}{mm}$
    • :flag-us: McMaster: 1.31 lbs/mm = 0.594 kg/mm = 5.85 N/mm
    • greater spring rate is "stronger"

material: spring steel / "music wire"

🔗 Typically, suppliers offer two kinds of "music wire" materials. The first option (EN 10270-1) is stronger and should be selected.

:::warning :bulb: If you are not sure what kind of spring you have: The first option is corrosive and hence has a dull-blackish surface, it also is highly magnetic. The second option is non-corrosive and hence should have a shiny surface and is only slightly magnetic. :::

EN 10270-1 DH ("stronger", corrosive)

:::info :thumbsup: This is tested and known to work. :::

  • tensile strength Rm for d=1.25mm: 2150-2380 MPa
  • stress profile: hight static, medium dynamic
  • good fatigue life (due to high tensile strength) 🔗
  • highly magnetic
  • elastic modulus (E): 206 MPa
  • shear modulus🔗 (G,$\mu$): 81.5 MPa
  • max. 121 ºC (250 ºF)
  • high-carbon steel alloy, cold drawn
  • norms
    • :flag-us: ASTM A-228
    • :flag-eu: EN 10270-1 DH (= Dynamic High ?)
    • :flag-de: DIN 17223, Klasse D
      • "hohe statische, mittlere dynamische Beanspruchung"

🔗

EN 10270-3 1.4310 ("weaker", non-corrosive)

:::info :fire: This is untested!? :::

  • tensile strength Rm for d=1.25mm: 1850-2300 MPa
    • 302NS: 1850-2130 MPa
    • 302HS: 2000-2300 MPa
  • elastic modulus (E): 185 MPa
  • shear modulus🔗 (G,$\mu$): 70 MPa
  • slightly magnetic
  • norms
    • :flag-us: 301, 302NS, 302HS
    • :flag-eu: EN 10270-3
    • :flag-de: Werkstoffnr. 1.4310
    • ISO: X10CrNi18-8

reference suppliers

:::info these suppliers provide good information and specs, they are not necessarily cheap ::: :flag-us: McMaster-Carr | The Spring Store | lee Spring (LCD125EB 03 M)
:flag-de: Sodemann (stronger, 12170) | Sodemann (stronger, 1m) | Gutekunst (stronger, D-198) | Gutekunst (stronger, 1m, KM-3280) | Gutekunst (weaker, VD-198) | Schweizer (only B2B, DF-1843)

technical drawings and visualizations

:::success

image alt
Di = De - 2*d :::

:flag-de: data sheet