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Spring Tolerances:

Spring Coil Diameter Tolerances ± in Table 1
Wire Dia in..
Spring index,  D/d
4 6 8 10 12 14 16
0.015 0.002 0.002 0.003 0.004 0.005 0.006 0.007
0.023 0.002 0.003 0.004 0.006 0.007 0.008 0.010
0.035 0.002 0.004 0.006 0.007 0.009 0.011 0.013
0.051 0.003 0.005 0.007 0.010 0.012 0.015 0.017
0.076 0.004 0.007 0.010 0.013 0.016 0.019 0.022
0.114 0.006 0.009 0.013 0.018 0.021 0.025 0.029
0.171 0.008 0.012 0.017 0.023 0.028 0.033 0.038
0.250 0.011 0.015 0.021 0.028 0.035 0.042 0.049
0.375 0.016 0.020 0.026 0.037 0.046 0.054 0.064
0.500 0.021 0.030 0.040 0.062 0.080 0.100 0.125

 

Tolerances for Hot Coiled Springs Table 2
Nominal Outside Diameter in Inches
Nominal Free Height or Length of Spring Inches
 
Up to 10 Inches
Over
10 to 18 Inches
Over
18 to 26 Inches
Over
26 to 34 Inches
Over
34 to 42 Inches
Over
42 to 60 Inches
Up to 6 Inches   1/16   3/32   1/8   5/32   3/16  
Over 6 to 8 Inches   1/2   1/8   3/16   1/4   1/4  
Over 8 to 12 Inches   3/32   3/16   1/4   1/4   1/4  
Over 12 to 16 Inches   1/5   1/4   1/4   1/4   1/4   5/16
Over 16 to 20 Inches       5/16   5/16   5/16   3/8
Over 20 to 24 inches       3/8   3/8   3/8   7/16

 

Soild Height Tolerances Table 3
Nominal Soild Height Inches
Deviation Above Nominal Soild Height max Inches
Up to 7 Inches
1/16
Over 7 to 10 Inches
3/32
Over 10 to 13 Inches
1/8
Over 13 to 16 Inches
5/32
Over 16 to 19 Inches
3/16
Over 19 to 22 Inches
7/32
Over 22 to 25 Inches
1/4
Over 25 to 28 Inches
9/32
Over 28 to 31 Inches
5/16
A For addational 3 inch increase in soild height, the deviation shown should be increased by 1/32 inch.

 

Tolerances for Retaining Rings Table 4
 
@ Dia. < 1.500 in
(< 38.1 mm )
@ Dia. < 1.500 in
(> 38.1 mm )
Gap
Diameter (D) Tolerance
± 0.15 inch
(.38 mm)
± 0.10 in per (0.25 mm) per each
1.000 in (25.4 mm) of Dia.
Gap tolerance X 3 Dia tolerance

 

Tolerances for Belleville Washers Table 5
Diameter Inches O.D. Inches I.D. Inches
+ 0.00 - 0.00
Up to 0.197 - 0.008 + 0.008
.0197 -0.394 - 0.010 + 0.010
0.394-0.984 - 0.012 + 0.012
0.984 to 1.969 - 0.016 + 0.016
1.969 to 3.937 - 0.020 + 0.020
Based on R* = 2 increased tolreance are required for lower R ratios. * (R=OD/ID)

 

Tolerances for Spring Washers Table 6
Washer
Stock Thickness
Inches
± Percent Load
Curved
0.004 - 0.039
15
Wave
0.004 - 0.010
33
0.010 - 0.012
25
0.012 - 0.020
20
0.020 - 0.039
15
0.039 - 0.079
12

Tolerances for Flat Springs Table 7
Thickness Range in Inches
Tolerance in inches
0.125 - 0.063
0.00200
0.062 - 0.040
0.00150
0.039 - 0.029
0.01000
0.028 - 0.020
0.00750
0.019 - 0.007
0.00050
Under 0.007
0.00030

Source Reference; SMI (Spring Manufactures Institute) Technology Committee; 1949,1970, 2000; Testing and Tolerancing, Guidelines for Spring Testing Tolerancing; SMI Encyclopedia of Spring Design

         

 

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Ph. 281-391-1888



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