Disk

Feature: In case of the disc spring, accumulated energy per unit volume is much greater than that of the coil spring so it shows a very big loading capacity with short stroke in small space. A loaddisplacement curve - straight line or nonlinear type - is available according to the conditions for use. Depending on increase/decrease of the sheets of the disc spring or on series/parallel/combination, the spring can have different characteristics. If it is used within the allowable stress, its lifetime is long. It is good at absorbing shocks and its shock-absorbing efficiency becomes high if the springs are piled up for use,

Usage: For nuclear power plants, safety valves, shock-absorbers of large industrial equipment, control valves, shock-absorbing springs in hydraulic cylinders, rolling stands, and shock-absorbers to stand big load in small space

Criteria of selecting materials according to the use condition of disc spring (for reference)

Materials	Heat Corrosion	Corrosion Resistance	Fatigue Resistance	Price	Operation Temperature	Remarks
SUP10(50CR V4)	Not bad	Not good	Good	Not bad	200C
SAE1070	Not good	Not good	Not bad	Cheap	100C
SUH660	Not bad	Good	Not good	Expensive	300C	Non - magnetic
SUS 304	Not bad	Not bad	Not good	Not bad	300C
SUS 301	Not bad	Not bad	Not good	Not bad	300C
INCONEL X-750	Very Good	Good	Not good	Very expensive	500C	Non - magnetic
SKD 4	Good	Not good	Not bad	Not bad	400C
SUS 630	Not bad	Not bad	Not good	Not bad	300C
C5191	Not good	Good	Not good	Expensive	100C

Any other material than described above can be used for special purposes
You are recommended to discuss with the engineers of Daewon Spring for the design and the material of springs

Specification

Record of specification in ordering disc springs
Classification	Special Requirements		Remarks
Material in use	Normally SUP 10		Choose the material based on the manufacturer's standards unless specified
Thickness of material (t)	mm
Inner diameter of spring (Di)	mm
Outer diameter of spring (De)	mm
Outer height of spring (Lo)	mm
Inner height of spring (Ho)	Vol
Designation of spring features	Height	Load	Management is done based oon the manufacturer's reference value in case there is no designated height and load.
Designation of spring features	mm	kgf
Shape of edge end	Facing required
Surface management after molding	Shot peening
Surface treatment	Black phosphate coating treatment		Treatment with rust preventive oil is possible upon request
Use or conditions for use	Record of use condition		Surrounding temperature, humidity, and method of use (series connection, parallel connection, combination connection)
Other specifications applicable	DIN 2092, 2093

Allowable Error **A. External & Internal Error**
Internal Diameter (De) / External Diameter (Di)	External Diameter Tolerance (mm)	nternal Diameter Tolerance (mm)
3 ~ 6mm below	0 ~ + 0.12	0 ~ + 0.12
6 ~ 10mm below	0 ~ + 0.15	0 ~ + 0.15
10 ~ 18mm below	0 ~ + 0.18	0 ~ + 0.18
18 ~ 30mm below	0 ~ + 0.21	0 ~ + 0.21
30 ~ 50mm below	0 ~ + 0.25	0 ~ + 0.25
50 ~ 80mm below	0 ~ + 0.30	0 ~ + 0.30
80 ~ 120mm below	0 ~ + 0.35	0 ~ + 0.35
120 ~ 180mm below	0 ~ + 0.40	0 ~ + 0.40
180 ~ 250mm below	0 ~ + 0.46	0 ~ + 0.46
250 ~ 315mm below	0 ~ + 0.52	0 ~ + 0.52
315 ~ 400mm below	0 ~ + 0.57	0 ~ + 0.57

**B. Thickness & Height Load Error**
Type	Thickness (t) mm	Thickness (t) Tolerance mm	Height (Lo) Tolerance mm	Load Tolerance (S = 0.75*ho%)
1 Type	0.2 ~ 0.4	+ 0.02 ~ - 0.03	+ 0.075 - 0.025	+ 25 - 7.5
	0.5 ~ 0.6	+ 0.025 ~ - 0.035
	0.7 ~ 0.8	+ 0.030 ~ - 0.040
	0.9	+ 0.035 ~ - 0.045
2 Type	1.0	+ 0.035 ~ - 0.045	+ 0.10 - 0.05	+ 15 - 7.5
	1.1 ~ 1.25	+ 0.040 ~ - 0.050
	1.5 ~ 1.75	+ 0.045 ~ - 0.055
	2.0	+ 0.050 ~ - 0.060
	2.25 ~ 2.5	+ 0.055 ~ - 0.065	+ 0.15 - 0.05
	3.0 ~ 3.5	+ 0.060 ~ - 0.075	+ 0.15 - 0.05
3 Type	4.0 ~ 14.0	+/-0.08	+/-0.20	+/-5