Endless extension springs in 499 spring sizes for fast delivery from stock made of normal steel EN 10270-1 and stainless steel 1.4310 from Gutekunst. The endless extension springs are made of round spring steel wire in a cylindrical shape without eyelets with a linear spring characteristic in quality grade 2 (medium tolerance range) according to DIN EN 15800. Simply select the appropriate endless extension spring in the spring shop and order it directly from Gutekunst using the shopping cart.
Endless extension springs catalog range
Endless extension springs in 252 dimensions made of standard steel EN 10270-1 (not rustproof, max. Temperature 80 degrees) in wire thicknesses (d) from 0.1 to 10.0 mm from stock.
Endless extension springs in 247 dimensions made of stainless steel 1.4310 (rustproof, max. Temperature 200 degrees) in wire thicknesses (d) from 0.2 to 10.0 mm from stock.
Endless extension springs are not thermally post-treated. Endless extension springs made of normal steel are lightly oiled after manufacture. Stainless steel endless extension springs are not treated any further after production. Additional surface treatments of the endless extension springs have the disadvantage that due to the pretensioning of the spring body, the application of the surface is only possible with great effort. Here, the choice of a suitable spring material is preferable to subsequent surface treatment. In this case, contact order@gutekunst-co.com .
Winding direction and spring ends
The endless extension springs are wound to the right (clockwise) as standard. The length of the endless extension springs is 1000 mm each. There are at the spring ends no loops.
Thermal post-treatment
The endless extension springs have no thermal treatment to enable the loops to be bent correctly. Before using it as a extension spring, it should be thermally treated.
thermal treatment > 30 minutes at 240 ° C > Cooling by air.
Spring forces
The specified maximum force "Fn" is the maximum force that can be achieved with the endless extension spring. The specified spring rate "R1" applies to the use of one turn. If you want to calculate the spring rate of a part of the spring, the spring rate "R" results from dividing "R1" by the number of active coils "n" R = R1 / n . The greatest extension length results from the division of the maximum permissible force "Fn" less preload "F0" by the spring rate "R" sn = (Fn-F0) / R . In the case of endless extension spring, the preload force tolerance "F0tol" is +/- 100% due to the production length.
Spring test
All metal springs are quality checked. This is done in our testing department, which is independent of production. The testing of the torsion springs offered in the catalog range is carried out in accordance with DIN ISO 2859-1 test level II. The procedure is based on the single sample plan for normal tests with test severity AQL = 1.0. If necessary, we can carry out and document all test regulations up to and including individual tests. We offer the following factory certificates for each test item.
Factory certificate according to:
EN 10204-2.1 (DIN 50049-2.1) free of charge
EN 10204-2.2 (DIN 50049-2.2) subject to charge *
EN 10204-3.1B (DIN 50049-3.1B) subject to charge *
*Price on request
calculation
The calculation of the endless extension spring was carried out in accordance with EN 13906 Part 2.
Prices and delivery time
After sending the request, Gutekunst will send you a non-binding offer within 1 - 3 days. The item prices are in the individual spring production, for smaller quantities up to 7 pieces, relatively expensive. As the number of inquiries increases, the individual metal springs become significantly cheaper.
After receipt of the order for the individual metal spring, the production time is approx. 3 - 5 weeks, depending on the spring material.
The dispatch takes place in Germany with DHL, in Europe with DHL or DPD. Outside Europe, we only ship with the customer's shipping account.
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