12 catalogued sizes, dimensioned to DIN 2097. Pick any row and the technical drawing redraws to it.
Extension Springs to DIN 2097 are catalogued in id 3.5-46 mm, with od 4.5-58 mm, long 20-250 mm. 12 sizes are held in the table below, and the technical drawing redraws to whichever row you select.
Standard
DIN 2097
ID
3.5-46 mm
OD
4.5-58 mm
Long
20-250 mm
Catalogued sizes
12
Dimensions are nominal values from the governing standard. Confirm the tolerance class for your application before ordering.
Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.
Dimensioned line drawing of 0.5 Extension Springs to DIN 2097. Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.
Inner diameter Di (mm)
3.5
Outer diameter De (mm)
4.5
Free length Lo (mm)
20
Active coils n
12
Max working force (N)
5.0
Rate k (N/mm)
0.807
Material
Spring steel
Opens a short step to confirm the exact specification before you enter contact details.
Request a Quotation for Extension Springs
Click “Request this configuration” under the drawing to confirm the exact specification, then add your contact details. You can also send the request without a specification — but only an accurate selection gets an accurate quote.
Dimensions & Specifications (DIN 2097)
Every row below is a starting point for the customizer above — pick any size and the drawing will redraw to that row.
Wire dia d (mm)
Inner diameter Di (mm)
Outer diameter De (mm)
Free length Lo (mm)
Active coils n
Max working force (N)
Rate k (N/mm)
Material
Reference standard
0.5
3.5
4.5
20
12
5.0
0.807
Spring steel
DIN 2097 / EN 15800
0.6
4.5
5.7
25
12
6.8
0.807
Spring steel
DIN 2097 / EN 15800
0.8
5.5
7.1
30
12
13
1.35
Spring steel
DIN 2097 / EN 15800
1.0
7.0
9.0
40
15
20
1.29
Spring steel
DIN 2097 / EN 15800
1.2
8.5
10.9
50
15
28
1.50
Spring steel
DIN 2097 / EN 15800
1.5
11.0
14.0
60
15
43
1.71
Spring steel
DIN 2097 / EN 15800
2.0
13.0
17.0
80
15
84
3.13
Spring steel
DIN 2097 / EN 15800
2.5
17.0
22.0
100
15
130
3.48
Spring steel
DIN 2097 / EN 15800
3.0
22.0
28.0
120
15
170
3.43
Spring steel
DIN 2097 / EN 15800
4.0
28.0
36.0
160
15
320
5.16
Spring steel
DIN 2097 / EN 15800
5.0
36.0
46.0
200
15
490
5.99
Spring steel
DIN 2097 / EN 15800
6.0
46.0
58.0
250
15
670
6.09
Spring steel
DIN 2097 / EN 15800
Extension Springs (DIN 2097) are a type of springs used across industrial assembly. Below is the complete size table together with material, standard and application guidance.
What Are Extension Springs?
Extension Springs are springs defined by DIN 2097. They are selected by wire diameter and the dimensional characteristics shown below, and are available in a range of materials and finishes to suit the application and environment.
Materials & Finishes
Springs are supplied in spring steel, and in stainless (302/316) or phosphor bronze where corrosion or non-magnetic behavior is required. The controlling specification is the wire diameter, the spring rate and the free length; ISO 898-1 property classes do not apply.
Specification Guides
Each size, material and standard of Extension Springs has its own reference page with the figures for that one configuration.
Extension Springs are supplied to order. Pricing starts from approximately US$0.18 per piece for standard sizes in spring steel; final pricing depends on size, material, finish and order quantity (MOQ applies). Submit your exact configuration with the quote form above.
Custom manufacturing · Made to drawing
Need a extension springs outside the standard range?
A non-standard spring is quoted from the drawing; where one already exists in the catalog, the special is usually a variation on its tooling.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.
01
Cold heading
Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail.
Head dimensions and under-head radius checked at set-up and per shift.
02
Thread rolling
Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch.
Go / no-go ring gauges to ISO 965 tolerance class 6g.
03
Heat treatment
Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it.
Core hardness and tensile tested per lot to ISO 898-1.
04
Surface treatment
Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list.
Coating thickness and neutral salt spray hours to ISO 9227.
Third-party video, selected automatically for this topic. It is not produced by Engineering Hardware and is not a specification source — use the tables on this page for dimensional data.
Frequently Asked Questions
What standard are Extension Springs manufactured to?
Extension Springs are manufactured to DIN 2097. The dimensional values on this page follow that standard.
What is the size range of Extension Springs?
The table on this page lists 12 sizes for Extension Springs, ranging from 0.5 to 6.0. Sizes outside the table can be quoted on request.
In which materials are Extension Springs supplied?
Extension Springs are supplied in spring steel SH/DH and stainless, with finishes including zinc plating, hot-dip galvanizing and black oxide. Choose material and finish to suit the load and the service environment for Extension Springs.
How do I request a quotation?
Use the parametric drawing on this page to set the exact configuration (size, material, finish) and click "Request this configuration" — a specialist from Engineering Hardware will respond within one business day.
Need a fastener quote or a spec sheet?Message our engineers on WhatsApp — send a drawing or DIN number and get pricing back fast.Start WhatsApp Chat →
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