Section D

Disc Springs (Washers) - Tolerances Rondelles à ressort (Belleville) – tolérances

The tolerances shown on this page are for unplated AM series only. For tolerances on other series, consult SPAENAUR .

TOLERANCE AND THICKNESS THICKNESS t

OD AND ID GUIDE CLEARANCE OD OR ID

TOLERANCE

CLEARANCE FOR

SIZE

OD OR ID

mm 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.25

Inch

mm

Inch

mm

Inch

mm

Inch

.0118 .0157 .0197 .0236 .0276 .0315

up to 16

up to 0.63

0.2

0.008 0.012 0.016 0.020 0.024 0.031 0.039

+.02 +.0008 -.06 -.0024

over 16 to 20 0.63 to 0.79 0.3 over 20 to 26 0.79 to1.02 0.4 over 26 to 31.5 1.02 to 1.24 0.5 over 31.5 to 50 1.24 to 1.97 0.6 over 50 to 80 1.97 to 3.14 0.8 over 80 to 140 3.15 to 5.52 1.0 over 140 to 250 5.52 to 9.85 1.6

.035 .039 .043 .049 .059 .069 .078 .088 .098 .118 .138

+.03 +.0012 -.09 -.0035

0.063 NOTE: Inside Guiding is preferred. Guide Bolts should be Rc55-60 ground and polished.

D

1.5

1.75

OD/ID TOLERANCE

2.0

+.04 +.0016 -.12 -.0047

OD/ID RANGE

TOTAL TOLERANCE

2.25

mm

Inch

mm

Inch

2.5 3.0 3.5

1.6 to 3 .063 to .118 0.102 3.0 to 6 .118 to .236 0.127 6.0 to 10 .236 to .394 0.152 10 to 18 .394 to .709 0.178 18 to 30 .709 to 1.18 0.203 30 to 50 1.18 to 1.97 0.254 50 to 80 1.97 to 3.15 0.305 80 to 120 3.15 to 4.72 0.356 120 to 180 4.72 to 7.09 0.406 180 to 250 7.09 to 9.84 0.457

0.004 0.005 0.006 0.007 0.008 0.010 0.012 0.014 0.016

± .127

± .005

4.0 to 16.0

.157 to .630

OVERALL HEIGHT TOLERANCE SPRING THICKNESS OVERALL HEIGHT Range TOLERANCE

GROUP mm

Inch

mm

Inch

1 less than less than +0.010 +0.0004 1.25 0.049 -0.05 -0.002 1.25 to 0.049 to +0.15 +0.006 2.00 0.078 -0.08 -0.003 2 over 2.00 over 0.078 +0.30 +0.012 to 3.00 to 0.118 -0.10 -0.004 over 3.00 over 0.118 +0.30 +0.012 to 6.00 to 0.236 -0.15 -0.006

0.018 NOTE: For OD, tolerance is MINUS value shown. For ID, tolerance is PLUS value shown.

LOAD TOLERANCE

GROUP

TOLERANCE FOR

THICKNESS RANGE LOAD AT mm Inch

DEFLECTION =.75h

less than

+25% -7.5% +15% -7.5% +10% -5%

1

0.049

3 over 6.00 over 0.236 to 14.00 to 0.551

± 0.30

± 0.012

1.25 1.25 to

0.049 - 0.118

3.00

DISC SPRING HARDNESS RANGE THICKNESS OF DISC mm Inch

2

over 3.00

0.118 - 0.236

to 6.00

ROCKWELL C

over 6.00

± 5%

3

0.236 - 0.551

0.2 to 0.9 1.0 to 4.0

.008 to .035 .039 to .157

46 to 51 44 to 49

When thickness, OA Height AND LOAD VALUES are specified, the controlling factor shall be the load shown. MATERIALS High-grade spring steel of selected surface condition. Most commonly used are C-1075 or SAE 6150 chrome vanadium steel. Other alloy steels are also used. We use 17-7Ph stainless for corrosion resistance. It is slightly magnetic. HARDNESS Disc springs are carefully heat treated with austempering process, and in such a manner as to prevent surface decar burization. to 14.00 NOTE: Load will vary in stacked springs in proportion to number of springs in stack.

4.25 to 16.0 .164 to .630 42 to 48 For Stainless Steel and Inconel, consult SPAENAUR.

CONVERSION TABLE inches x 25.4 = millimetres millimetres : 25.4 = inches

CATALOG 14

1 lb. = .454 kg 1 kg = 2.2 lbs.

1 psi = .0007 kg/mm 2 1 kg/mm 2 = 1422 psi 1 Newton (N) = .225 lbs. force 1 lb. force = 4.44 N 1 N/mm 2 = .102 kg/mm 2 = 145 psi 1 kg/mm 2 = 9.81 N/mm 2 = 1422 psi

D45

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