Extension Springs - Spring Inquiry - Information - english - Gutekunst Federn

information extension springs

As well as our catalogue range, we also manufacture individual extension springs for you with wire diameters of up to 12.00 mm from all spring steels in both small-batch and large-volume series.

Please enter all the known features of the springs required in the inquiry form. In addition to the pre-set inquiry boxes you can also put inquiry boxes together according to your individual requirements. To do this, just change the symbol to the left of the inquiry boxes. If you don't have all the necessary information available, send us your inquiry just the same. We will call you back if necessary.

1. Material selection

Please choose the material you require. If you are not certain about which material to select, leave this box empty and fill in all the boxes for application conditions instead (load/total, load/minute, working environment, working temperature). Our engineers will determine the necessary characteristics for your spring on the basis of this information.

Designation, Material-description	Max. operating temp.	DIN	EN	F (AFNOR)	GB (BS)	S (SIS)	USA (AISI)
EN 10270-1 type SH and DH Spring steel wire For all common springs	80°C	17223-1	10270-1	NFA 47-301-76	BS 5216-75	*	AMS 5112
1.4310 / X10CrNi188 Stainless steel V2A High corrosion resistance	270°C	17224	10270-3	Z12CN17.07	301S21	2330	302
EN 10270-2 / VDC (unalloyed) Valve spring wire In high dynamical stress	80°C	17223-2	10270-2	*	*	*	*
EN 10270-2 / VDSiCr (alloyed) Valve spring wire In high dynamical stress over 100° C	100°C	17223-2	10270-2	*	2803 685A55HD	*	6150
EN 10270-2 / VDCrV (alloyed) Valve spring wire In high dynamical stress over 100° C	80°C	17223-2	10270-2	*	*	*	*
1.4301 / X5CrNi1810 Spring steel V2A Corrosion resistance	250°C	17440		Z6CN18.09	304S15	2332	304
1.4401 / X5CrNiMo171-12-2 Spring steel V4A Corrosion resistance, good relaxation, non-magnetic	300°C	17224	10270-3	Z6CND17.11	316S31	2347	316
1.4436 / X5CrNiMo17133 Spring steel V4A Good corrosion resistance, slightly magnetic	300°C	17440		Z6CND17.12	316S16	2343	316
1.4539 / X1NiCrMoCuN25-20-5 Spring steel V4A For aggressive environments, non-magnetic	300°C	17440	10088	Z1NCDU25.20	*	2562	904 L
1.4568 / X7CrNiAI17-7 Spring steel V4A Minimal relaxation, high dynamical stress	350°C	17224	10270-3	Z8CNA17.07.01	301S81	2388	631
1.4571 / X6CrNiMoTi17-12-2 Spring steel V4A Corrosion resistant, high strength	300°C	17740	10270-3	Z6CNDT17.12	320S31	2350	316Ti
2.0321 F70 / CuZn36 Copper wire Non-magnetic, salt-water proof	60°C	17682	12166	*	*	*	*
2.1020.39 F95 / CuSn6 Bronze alloy Non-magnetic, solderable, weldable, corrosion resistant	60°C	17682	12166	*	*	*	*
2.1247.57 F95 / CuBe2 Copper beryllium Corrosion resistant, anti-magnetic, non-sparking	80°C	17682	12166	*	*	*	*
2.4610 / NiMo16Cr16Ti Hastelloy C4 For very corrosive environments	450°C	17744		*	3076 NA 45	*	5698 / 5699
2.4669 / NiCr15Fe7TiAI Inconel X750 High temperature, non-magnetic	600°C	17752		*	HR 505	*	AMS 5698
2.4632 / NiCr20CO18Ti Nimonic 90 Resistant to most gas corrosion	500°C	17754		*	BS 3075 (NA19)	*	*
Duratherm / CoNiCrFe Duratherm High temperatures	600°C			*	*	*	*

2. Dimensional data

We manufacture extension springs up to a wire thickness of 12.00 mm. Please enter at least one of the following value combinations if possible.

according to structural dimension		according to strength and length
d	wire diameter	De	outer coil diameter
De	outer coil diameter	F2	loaded spring force
Lk	length of relaxed spring body	L2	loaded spring length
L0	length of unstressed spring

according to strength and spring deflection		according to strength and spring rate
De	outer coil diameter	De	outer coil diameter
F2	loaded spring force	F2	loaded spring force
s2	loaded spring deflection	R	spring rate

according to lengths and spring rate
De	outer coil diameter
L1	prestressed spring length
L2	loaded spring length
R	spring rate

3. Loop position

Please enter the required twisting angle between the loops.


0°	90 °

180°	270°	Free loop position

4. Loop shape

Please select the loop shape in following table. Please note that the loop characteristics (e.g. for "1/1 German loop" the value for "Lh" must lie between 0.8 and 1.1 "Di") and please enter the additional "Lh" (distance of the inner edge of the loop from the spring body) and "m" (loop opening width) as well. Di = De - (2 · d)

1/1 German loop
Make input for "Lh" and "m"
(Lh = 0,8 up to 1,1 Di)

1/1 douple German loop
Make input for "Lh"
(Lh = 0,8 up to 1,1 Di)

1/1 German side loop
Make input for "m"
(Lh ~ Di)

1/1 double German side loop
No more input
(Lh ~ Di)

1/1 German loop, inclined extended
Make input for "m"

1/2 German loop
Make input for "Lh" and "m"
(Lh = 0,55 up to 0,8 Di)

English loop
Make input for"m"
(Lh ~ 1,1 Di)

Hook
Make input for "Lh" und "m"

Extended side hook
Make input for "Lh" und "m"

Coiled-in hook
Send drawing !

Screwed plug
Send drawing !

Screwed
Send drawing !

Screwed-in shackle
Send drawing !

5. Tolerances

Normally our extension springs are produced i.a.w. DIN 2097 grade 2.
If you select grade 1, then your extension springs will be produced to the smallest clearance spaces and grade 3 to the largest clearance spaces.

6. Coiling direction


left	right

Our extension springs are usually wound right-handed. There are some areas of application, however, where you should note the direction of winding.

When rotating forces are used

In this case the direction of winding should be the opposite to the direction of rotation.

7. Determine application

Please fill out all the fields of the area of determine application. Our technicians will use this information to determine the specifications of your springs.

Load / Total
Total expansions during the required lifespan (pc.).
Load / Min.
Number of expansions in a minute (pc.).
Working environment
Surroundings in which the spring will be installed (saltwater, oil, etc.).
Application temperature
Temperature where the spring will be installed (C°).

8. Surface treatments

All subsequent surface treatments cause unavoidable delay, as the application of a protective layer between the coils is very difficult due to the preset nature of the spring body. Here the selection of a suitable material should be made for an additional surface coating.

If you are not sure which is the correct surface finish to select, please fill in all the boxes for application conditions. Our engineers will determine the necessary characteristics for your spring on the basis of this information.

Surface treatment	Attributes
Galvanised	Anti-corrosion protection.
Galvanised with polished finish	Visual surface coating, anti-corrosion protection.
Galvanised with chromatic coating	Visual surface coating, anti-corrosion protection. (colour blue, yellow, black, olive)
Nickel-plated	Visual surface coating, anti-corrosion protection, affordable frictionless characteristics.
Chrome-plated	Visual surface coating, anti-corrosion protection.
Pickled	Removed by chemically encased pollutants.
Passivated	Surface resistance due to oxide film, self repairing, anti-corrosion protection.
Copper-plated	Good conductivity, anti-corrosion protection.
Bronzed	Visual surface coating, smooth coloured surface, reduced noncorrosive properties.
Electro-polished	Surface coating for stainless steel, visual finishing. Mainly used for medical equipment.
Gold-plated	Visual surface coating, conductivity, prevents excessive arcing. Less mechanical and chemical resistance.
Teflon-coating	Very good frictionless characteristics.
Delta Magni	Very high anti-corrosion protection, perfect for food.
Shot-peening	Increased dynamic lifespan.
Plastic-powder-coating	Visual surface coating, the 180 different RAL colours are colour fast, sheen durability/RAL colour no.

9. Attach drawing / sketch

The following formats can bei processed:

Drawing formats:

PDF, JPG, TIFF, GIF, BMP

CAD-Formats (2D and 3D):

DXF, DWG, IGES, SAT, STEP

Gutekunst Federn · Carl-Zeiss-Strasse 15 · D-72555 Metzingen
Phone 0049 71 23 9 60-0 · Fax 0049 71 23 9 60-195
service@gutekunst-co.com

formula	specification	unit
BstNr	order number
Mat	type of material
Oefo	loop shape
Oest	loop position	degrees
Oesttol	+/- tolerance of loop position	degrees
d	wire diameter	mm
D	mean coil diameter	mm
De	outer coil diameter	mm
Detol	+/- tolerance of outer coil diameter	mm
Dh	minimum bush diameter	mm
F0	initial tension	N
F1	prestressed spring force	N
F1tol	+/- tolerance of prestressed spring force	N
F2	loaded spring force	N
F2tol	+/- tolerance of loaded spring force	N
Fn	maximum spring force	N
Fntol	+/- tolerance of maximum spring force	N
Lk	length of relaxed spring body	mm
L0	length of unstressed spring, measured from inner edge of loop to inner edge of loop	mm
L0tol	+/- tolerance of unstressed length	mm
L1	prestressed spring length, inner loop to inner loop	mm
L2	loaded spring length, inner loop to inner loop	mm
Ln	maximum spring length, inner loop to inner loop	mm
s1	prestressed spring deflection	mm
s2	loaded spring deflection	mm
sh	maximum stroke	mm
sn	maximum spring deflection	mm
Lh	distance of inner edge of loop from the spring body	mm
m	loop opening width	mm
R	spring rate	N/mm
nt	total number of coils	pc.
Gew	weight of one spring	g
PG	price group

formula	specification	unit
General
Material	Material
G	Shearing modulus	N/mm²
E	Elasticity modulus	N/mm²
Rm min	Minimum tensile strength	N/mm²
tau zul	Permitted shearing strength	N/mm²
k	Stress coefficient
Quality grade	Production quality grade
Wire length	Wire length for producing a spring	mm
Wire weight	Wire weight for producing a spring	g

Loops
Loop position	Angle between loops	degrees
Loop shape 1	Loop shape 1
Lh 1	Loop height of eye shape 1	mm
Loop shape 2	Loop shape 2
Lh 2	Loop height of eye shape 2	mm

Diameter
d	Wire diameter	mm
Di	Inner coil diameter	mm
D	Mean coil diameter	mm
De	Outer coil diameter	mm
Dh min	Minimum bush diameter	mm

Lengths
L0	Length of unstressed spring, measured from inner edge of loop to inner edge of loop	mm
L1	Prestressed spring length, inner loop to inner loop	mm
L2	Loaded spring length, inner loop to inner loop	mm
Ln	Maximum spring length, inner loop to inner loop	mm
Lk	Length of relaxed spring body	mm

Deflections
s1	Prestressed spring deflection	mm
s2	Loaded spring deflection	mm
sn	Maximum spring deflection	mm

Forces
F0	Initial tension	N
F1	Prestressed spring force	N
F2	Loaded spring force	N
Fn	Maximum spring force	N
F0 winding bench	Alignment force for F0 for manufacture on winding bench	N
F0 automatic	Alignment force for F0 for manufacture on automatic unit	N

Spring rate
R	Spring rate	N/mm

Coils
n	Number of active coils	pc.
nt	Total number of coils	pc.
nt-n	Number of non-elastic coils	pc.

Pitch
St.	Spring pitch (coil centre to coil centre)	mm
St.W	Pitch angle	degrees

Ratios
w	Winding ratio
Lk/D	Degree of slimness

Statics load
tau k0	Corrected shearing stress at F0	N/mm²
tau k1	Corrected shearing stress at F1	N/mm²
tau k2	Corrected shearing stress at F2	N/mm²
tau kn	Corrected shearing stress at Fn	N/mm²
tau k2 / tau zul	Ratio
tau kn / tau zul	Ratio