Disc Springs

Brand :

MISUMI

Caution

Product Description

Disc Springs
Disc Springs also known as belleville spring are an economy item, The price is cheaper than the MISUMI standard product.They offer a wide variety of sizes to choose from.
[Feature]
● Outer Diameter Minimum/Maximum (mm.) : 8 and 50
● Inner Diameter Minimum/Maximum (mm.) : 4.2 and 25.4
● Free State Height Minimum/Maximum (mm.) : 0.55 and 4.1 (depend on product code)
● Material : 50CrVA
● Surface treatment : Phosphating
[Application]
Disc springs are utilized in bolted joints to maintain the desired preload force.

Product Overview

Overview
Disc springs are springs formed by making a hole in the center of a disk to create a conical disc shape. Unlike traditional springs, they have unique functions.
Can withstand heavy loads with small deformation, has a short stroke, requires little space, is easy to use in combination, convenient for maintenance and replacement, highly economical and safe, and has a long service life.
At the same time, it is also considered a spring with a high level of design difficulty. When used in stacks, even slight dimensional differences can have a significant impact on the load, and may also cause a reversal in the relationship between displacement and load.

Dimensional Drawing

*CAD is not ready with Some Part Number.

· Material Table

Material: 50CrVA

Surface Treatment: Phosphating

Type	Material	Surface Treatment	Hardness
E-SRBN	50CrVA	Phosphating Treatment	42 to 52HRC
E-SSRBN	SUS304	-	37 to 46HRC

Specification Table

Part Number			Tolerance (D) mm	Inner Diameter (d) mm	Tolerance (d) mm	Plate Thickness (t) mm	Free Height (H0) mm	Tolerance (H0) mm	Maximum Deformation (h) mm	Load (at 75% displacement) N
Type	Outer Diameter (D) mm	Load Shape	Tolerance (D) mm	Inner Diameter (d) mm	Tolerance (d) mm	Plate Thickness (t) mm	Free Height (H0) mm	Tolerance (H0) mm	Maximum Deformation (h) mm	Load (at 75% displacement) N
E-SRBN (50CrVA) E-SSRBN (SUS304)	6	B	0 —0.12	3.2	+0.12 0	0.3	0.45	+0.1 —0.05	0.15	119 (110)
	8	A	0 to 0.15	4.2	+0.15 0	0.3	0.55		0.25	119
	8	B		4.2		0.4	0.6		0.2	210
	10	A		5.2		0.4	0.7		0.3	213
	10	B		5.2		0.5	0.75		0.25	323
	12.5	A	0 —0.18	6.2		0.5	0.85		0.35	294
	12.5	B		6.2		0.7	1		0.3	657
	14	A		7.2		0.5	0.9		0.4	274
	14	B		7.2		0.8	1.1		0.3	813
	16	A		8.2		0.6	1.05		0.45	411
	16	B		8.2		0.9	1.25		0.35	1029
	18	A		9.2		0.7	1.2		0.5	568
	18	B		9.2		1	1.4		0.4	1274
	20	A	0 -0.21	10.2	+0.18 0	0.8	1.35		0.55	745
	20	B		10.2		1.1	1.55		0.45	1520
	22.5	A		11.2		0.8	1.45		0.65	710
	22.5	B		11.2		1.25	1.75	+0.15 -0.08	0.5	1950
	25	A		12.2		0.9	1.6	+0.10 -0.05	0.7	868
	25	B		12.2		1.5	2.05	+0.15 -0.08	0.55	2910
	28	A		14.2		1	1.8	+0.10 -0.05	0.8	1110
	28	B		14.2		1.5	2.15	+0.15 -0.08	0.65	2850
	31.5	A	0 —0.25	16.3		1.25	2.15		0.9	1920
	31.5	B		16.3		1.75	2.45		0.7	3900
	35.5	A		18.3	+0.21 0	1.25	2.25		1	1700
	35.5	B		18.3		2	2.8		0.8	5190
	40	A		20.4		1.5	2.65		1.15	2620
	40	B		20.4		2.25	3.15	+0.20 -0.10	0.9	6540
	45	A		22.4		1.75	3.05	+0.15 -0.08	1.3	3660
	45	B		22.4		2.5	3.5	+0.20 -0.10	1	7720
	50	A		25.4		2	3.4	+0.15 -0.08	1.4	4756
	50	B		25.4		3	4.1	+0.20 -0.10	1.1	11964
	56	A	0 -0.30	28.5	+0.21 0	2	3.6	+0.15 -0.08	1.6	4438(4093)
	56	B		28.5	+0.21 0	3	4.3	+0.20 -0.10	1.3	11388(10504)
	63	A		31	+0.25 0	2.5	4.25	+0.20 -0.10	1.75	7189(6631)
	63	B		31		3.5	4.9	+0.30 -0.15	1.4	15025(13858)
	71	A		36		2.5	4.5	+0.20 -0.10	2	6725(6203)
	71	B		36		4	5.6	+0.30 -0.15	1.6	20535(18940)
	80	A		41		3	5.3	+0.20 -0.10	2.3	10518(9701)
	80	B		41		5	6.7	+0.30 -0.15	1.7	33559(30953)
	90	A	0 -0.35	46		3.5	6		2.5	14161(13061)
	90	B		46		5	7		2	31354(28919)
	100	A		51	+0.30 0	3.5	6.3		2.8	13070
	100	B		51		6	8.2		2.2	48022
	125	A	0 —0.40	64		5	8.5		3.5	29908
	125	B	0 —0.40	64		8 (7.5)	10.6	±0.30	2.6	85926

The plate thickness (t) in the specification table is the nominal value; the value in parentheses is the actual plate thickness.

Please refer to the value in parentheses for the load of E-SSRBN. kgf=N × 0.101972

Product Features

Characteristics of Disc Springs
1. High stiffness, strong cushioning and vibration absorption capability, able to withstand large loads with small deformation, suitable for applications with limited axial space.
2. This type of spring has variable stiffness characteristics.
3. By using the same disc springs in different combinations, the spring characteristics can be varied over a wide range.
Can be arranged in parallel overlap, vertical combination, or a combination of parallel and vertical arrangements.

■ Differences between MISUMI Economy Series and Market Standard Products

Products circulating on the market *	MISUMI Economy series
24H Salt Spray Test Results	48H Salt Spray Test Results
Surface treatment: black oxide coating	Surface treatment: phosphating

■ Dimensional Consistency Test

Products circulating on the market *	MISUMI economy series
30PC Consistency Test (CPK)	50PC Consistency Test (CPK)
Tolerance of Spring Height (H0) CPK=0.48	Tolerance of Spring Height (H0) CPK=1.48	Product dimensional consistency is three times that of products circulating on the market
Overlapping use may cause unstable performance	Ensure stable performance when used in overlap

· When used in combination, the inner cone height and disc thickness of disc springs have a significant impact on the spring's performance characteristics. If dimensional consistency is low, the internal stress distribution across the cross-section will be uneven. A good CPK index can effectively improve its fatigue strength and the vibration absorption capacity per unit volume of material. Extend product lifespan.
*Products circulating on the market are similar products randomly purchased by our company from online or offline markets
*The test data are obtained through testing by our company, which are for reference only

Usage Method

Precautions

Changes in Inner and Outer Diameter During Compression
Disc Spring Precautions and Disc Spring Coefficient

*When the travel of the disc spring exceeds 75%, the load increases only slightly, but it greatly affects the service life of the disc spring. Therefore, the optimal operating range is between 10% and 75% of its maximum displacement.
*When using disc springs in combination, a guide rod or guide sleeve is required for the inner or outer diameter. The shape of the spring changes as it is compressed, so it is important to consider the clearance with the guide component.

Inside/Outside diameter (mm)	Recommended Clearance (mm)
15 or Less	0.2
20 or Less	0.3
26 or Less	0.4
45 or Less	0.6
75 or less	0.8
140 or Less	1.0
250 or Less	1.6

(For reference only, not guaranteed values)

Example of Use