Manufacturers of : Disc Springs, Disc Springs for Heavy Bolt Section, Disc Springs for Flange Applications, Disc Springs Tolerances, Channels & Springs, Group Spacers, Shims, Lock Washers, Valve Plates, Springs Plates, Finger Plates, Channel Springs, Valve Reads, Valve Assembly.
Introduction
Disc Springs Tolerances
THICKNESS TOLERANCE
Permissible variations for the disc thickness
Group Disc thickness
t
mm		 Permissible variations
for the disc thickness
mm
1 0.3
0.4		 +0.020
-0.030
0.5
0.6		 +00.25
-0.035
0.7
0.8		 +0.030
-0.040
0.9
 +0.035
-0.045
1
 +0.035
-0.045
2 1.1
1.25		 +0.040
-0.050
1.5
1.75		 +0.045
-0.055
2
 +0.050
-0.060
2.25
2.5		 +0.055
-0.065
3
3.5		 +0.065
+0.075
3 from 4 to 14
0.080
OD AND ID GUIDE CLEARANCE
OD or ID Size Clearance for OD or ID
MM MM
3 TO 14 0.2
15 TO 19 0.3
20 TO 25 0.4
26 TO 29 0.5
30 TO 64 0.6
65 TO 127 1.0
NOTE: Whenever inside guiding are preferred, guide bolts
should  be harden to 55/60 HRC, also to be ground polished
OD/ID TOLERANCE
MM TOTAL TOLERANCE (MM)
1.6-3 0.1
3.0-6 0.127
6.0-10 0.15
10-18 0.18
18-30 0.2
30-50 0.25
50-80 0.35
80-120 0.35
120-180 0.4
180-250 0.45
NOTE: Tolerances on OD are shown on minus side,
Tolerances on ID are shown on plus side.
OVERALL HEIGHT TOLERANCE
Group Disc thickness
t
mm		 Permissible variation
for O.H.
mm
1 smaller than 1 +0.075
-0.025
2
1 and smaller
than 2.25
+0.10
-0.05
2.25 and smaller
than 4
+0.15
-0.05
3 from 4 to 14
0.20
DISC SPRING HARDNESS RANGE
Thickness of Disc in mm Rockwell C
0.2-0.9 49-51
1.0-4.0 46-49
4.25-16.0 45-48
For stainless steel and inconel, consult factory.
LOAD TOLERANCE
THICKNESS
t (mm)		 PERMISSIBLE LOAD DEVIATION
FOR LOAD P at f approx. .75h
3.0 to 0.9 +25%
-7.5%
1.0 to 3.5 +15%
-7.5%
4.0 to 16
5%
NOTE: Load will vary in stacked springs
in proportion to number of springs in stack.
MANUFACTURING COMPROMISE

The manufacturer needs to have option on production for adjustment of disc spring diamension in order to able to adhere to the required load within allowable allowances.
CONVERSION TABLE
inches x 25.4 = millimeters
Millimeter ÷ 25.4 = inches
1 lb = .454 kg
1 kg = 2.2 lbs.
1 psi = .0007 kg/mm2
1 kg/mm2 = 1422 psi
1 Newton (N) = .225 lbs. Force
1 lb.Force = 4.44 N
1 N/mm2 = .102 kg/mm2 =145 psi
1 kg/mm2 = 9.8 N/mm2 =1422 psi
Specified Measurement Achieved by adjustment of
A given load and related
height for the stressed spring		 Overall Spring height
Given load and related height
of the Stressed spirng		 Overall Height and
Thickness

The numerical value of the allowable production of the adjustment of Disc Spring dimension must be indicated on the drawing and are considered only for reference purposes.
Manufacturers of : Disc Springs, Disc Springs for Heavy Bolt Section, Disc Springs for Flange Applications, Disc Springs Tolerances, Channels & Springs, Group Spacers, Shims, Lock Washers, Valve Plates, Springs Plates, Finger Plates, Channel Springs, Valve Reads, Valve Assembly.
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