Standard Spring Dimension Tolerances for Custom and Stock Springs

At China Spring Products Corp we aim to manufacture your custom springs with precision as there are certain standard industry tolerances that must be adhered to. Below you will find a list of all the standard tolerances for compression springs, extension springs, torsion springs, garter springs, and conical and barrel springs.

Standard Compression Spring Tolerances

coil compression spring dimensions standard tolerances

Outer/Inner Diameter Tolerances

0.025” to 0.050” ± 0.002”
0.051” to 0.100” ± 0.003”
0.101” to 0.250” ± 0.005”
0.251” to 0.500” ± 0.008”
0.501” to 0.850” ± 0.015”
0.851” to 1.125” ± 0.020”
1.126” to 1.250” ± 0.025”
1.251” to 1.480” ± 0.030”
1.481” to 1.750” ± 0.040”
1.751” to 2.000” ± 0.055”
2.001” to 2.250” ± 0.065”
2.251” to 2.500” ± 0.075”
2.501” to 2.750” ± 0.090”
2.751” to 3.000”± 0.115”
3.001” to 3.500” ± 0.130”
3.501” to 4.000” ± 0.160”
4.001” to 4.500” ± 0.190”
4.501” to 5.000” ± 0.225”
5.001” to 5.500” ± 0.250”
5.501” to 6.000” ± 0.280”
6.001” to 6.500” ± 0.310”
6.501” to 7.000” ± 0.350”
7.001” to 7.500” ± 0.385”
7.501” to 8.000” ± 0.415”
8.001” to 8.500” ± 0.455”
8.501” to 9.000” ± 0.490”
9.001” to 9.500” ± 0.525”
9.501” to 10.000” ± 0.565”

Wire Diameter Tolerances

Note: China Spring Products Corp does not manufacture the wire used to manufacture springs.

The following tolerances apply for the following wire types:

Hard Drawn HD A679
Hard Drawn ASTM A227
Music Wire ASTM A228
Oil Tempered MB A229
Carbon Valve A230
Phosphor Bronze Grade A B159
Beryllium Copper B197
Stainless Steel 17-7 ASTM A313
Stainless Steel 302 ASTM A313
Stainless Steel 316 ASTM A316

0.005” to 0.018” ± 0.0005”
0.019” to 0.040” ± 0.0006”
0.041” to 0.0625” ± 0.0007”
0.063” to 0.090” ± 0.0008”
0.091” to 0.125” ± 0.0009”
0.126” to 0.250” ± 0.001”
0.251” to 0.375” ± 0.00125”
0.376” to 0.500” ± 0.001375”
0.501” to 0.625” ± 0.0015”

The following tolerances apply for the following wire types:

Chrome Silicon A401
5160 H

0.100” to 0.125” ± 0.0009”
0.126” to 0.250” ± 0.001”
0.251” to 0.375” ± 0.00125”
0.376” to 0.500” ± 0.001375”
0.501” to 0.625” ± 0.0015”
0.626” to 0.750” ± 0.0016”
0.751” to 1.250” ± 0.0017”

Free Length Tolerances

0.001” to 0.500” ± 0.015”
0.501” to 1.000” ± 0.025”
1.001” to 2.000” ± 0.050”
2.001” to 4.000” ± 0.100”
4.001” to 8.000” ± 0.200”
8.001” to 10.000” ± 0.300”
10.001” to 15.000” ± 0.400”
15.001” to 20.000” ± 0.500”
20.001” to 25.000” ± 0.650”
25.001” to 30.000” ± 0.800”
30.001” to 35.000” ± 1.000”
35.001” to 40.000” ± 1.200”
40.001” to 48.000” ± 1.375”
48.000” and up ± 1.500”

Total Coils Tolerances

±¼ coil or reference if load or rate needs to be met.

Solid Height Tolerances

±7% or reference if load or rate needs to be met.

Rate Tolerances

Spring rate has a manufacturing tolerance of ±10%

Working Loads Tolerance

Working loads has a manufacturing tolerance of ±10%

Standard Extension Spring Tolerances

tension extension spring dimensions standard tolerances

Outer/Inner Diameter Tolerances

0.040” to 0.050” ± 0.002”
0.051” to 0.100” ± 0.003”
0.101” to 0.250” ± 0.005”
0.251” to 0.500” ± 0.008”
0.501” to 0.850” ± 0.015”
0.851” to 1.125” ± 0.020”
1.126” to 1.250” ± 0.025”
1.251” to 1.480” ± 0.030”
1.481” to 1.750” ± 0.040”
1.751” to 2.000” ± 0.055”
2.001” to 2.250” ± 0.065”
2.251” to 2.500” ± 0.075”
2.501” to 2.750” ± 0.090”
2.751” to 3.000”± 0.115”
3.001” to 3.500” ± 0.130”
3.501” to 4.000” ± 0.160”
4.001” to 4.500” ± 0.190”
4.501” to 5.000” ± 0.225”
5.001” to 5.500” ± 0.250”
5.501” to 6.000” ± 0.280”
6.001” to 6.500” ± 0.310”
6.501” to 7.000” ± 0.350”

Wire Diameter Tolerances

Note: China Spring Products Corp does not manufacture the wire used to manufacture springs.

The following tolerances apply for the following wire types:

Hard Drawn HD A679
Hard Drawn ASTM A227
Music Wire ASTM A228
Oil Tempered MB A229
Carbon Valve A230
Phosphor Bronze Grade A B159
Beryllium Copper B197
Stainless Steel 17-7 ASTM A313
Stainless Steel 302 ASTM A313
Stainless Steel 316 ASTM A316

0.005” to 0.018” ± 0.0005”
0.019” to 0.040” ± 0.0006”
0.041” to 0.0625” ± 0.0007”
0.063” to 0.090” ± 0.0008”
0.091” to 0.125” ± 0.0009”
0.126” to 0.250” ± 0.001”
0.251” to 0.375” ± 0.00125”
0.376” to 0.500” ± 0.001375”
0.501” to 0.625” ± 0.0015”

The following tolerances apply for the following wire types:

Chrome Silicon A401
5160 H

0.100” to 0.125” ± 0.0009”
0.126” to 0.250” ± 0.001”
0.251” to 0.375” ± 0.00125”
0.376” to 0.500” ± 0.001375”
0.501” to 0.625” ± 0.0015”
0.626” to 0.750” ± 0.0016”
0.751” to 1.250” ± 0.0017”

Length Inside Hooks Tolerances

0.001” to 0.500” ± 0.015”
0.501” to 1.000” ± 0.025”
1.001” to 2.000” ± 0.035”
2.001” to 4.000” ± 0.050”
4.001” to 8.000” ± 0.125”
8.001” to 10.000” ± 0.200”
10.001” to 15.000” ± 0.300”
15.001” to 20.000” ± 0.400”
20.001” to 25.000” ± 0.550”
25.001” to 30.000” ± 0.700”
30.001” to 35.000” ± 0.900”
35.001” to 40.000” ± 1.100”
40.001” to 48.000” ± 1.250”

Rate Tolerances

Spring rate has a manufacturing tolerance of ±10%

Working Loads Tolerance

Working loads has a manufacturing tolerance of ±10%

Initial Tension Tolerances

Reference Only

Standard Torsion Spring Tolerances

torsion spring dimensions standard tolerances

Outer/Inner Diameter Tolerances

0.025” to 0.050” ± 0.002”
0.051” to 0.100” ± 0.003”
0.101” to 0.250” ± 0.005”
0.251” to 0.500” ± 0.008”
0.501” to 0.850” ± 0.015”
0.851” to 1.125” ± 0.020”
1.126” to 1.250” ± 0.025”
1.251” to 1.480” ± 0.030”
1.481” to 1.750” ± 0.040”
1.751” to 2.000” ± 0.055”
2.001” to 2.250” ± 0.065”
2.251” to 2.500” ± 0.075”
2.501” to 2.750” ± 0.090”
2.751” to 3.000”± 0.115”
3.001” to 3.500” ± 0.130”
3.501” to 4.000” ± 0.160”
4.001” to 4.500” ± 0.190”
4.501” to 5.000” ± 0.225”
5.001” to 5.500” ± 0.250”
5.501” to 6.000” ± 0.280”
6.001” to 6.500” ± 0.310”
6.501” to 7.000” ± 0.350”
7.001” to 7.500” ± 0.385”
7.501” to 8.000” ± 0.415”
8.001” to 8.500” ± 0.455”
8.501” to 9.000” ± 0.490”
9.001” to 9.500” ± 0.525”
9.501” to 10.000” ± 0.565”

Wire Diameter Tolerances

Note: China Spring Products Corp does not manufacture the wire used to manufacture springs.

The following tolerances apply for the following wire types:

Hard Drawn HD A679
Hard Drawn ASTM A227
Music Wire ASTM A228
Oil Tempered MB A229
Carbon Valve A230
Phosphor Bronze Grade A B159
Beryllium Copper B197
Stainless Steel 17-7 ASTM A313
Stainless Steel 302 ASTM A313
Stainless Steel 316 ASTM A316

0.005” to 0.018” ± 0.0005”
0.019” to 0.040” ± 0.0006”
0.041” to 0.0625” ± 0.0007”
0.063” to 0.090” ± 0.0008”
0.091” to 0.125” ± 0.0009”
0.126” to 0.250” ± 0.001”
0.251” to 0.375” ± 0.00125”
0.376” to 0.500” ± 0.001375”
0.501” to 0.625” ± 0.0015”

The following tolerances apply for the following wire types:

Chrome Silicon A401
5160 H

0.100” to 0.125” ± 0.0009”
0.126” to 0.250” ± 0.001”
0.251” to 0.375” ± 0.00125”
0.376” to 0.500” ± 0.001375”
0.501” to 0.625” ± 0.0015”
0.626” to 0.750” ± 0.0016”
0.751” to 1.250” ± 0.0017”

Leg Length Tolerances

0.020” to 0.025” ± 0.015”
0.051” to 0.250” ± 0.030”
0.251” to 1.000” ± 0.040”
1.001” to 2.000” ± 0.060”
2.001” to 4.000” ± 0.135”
4.001” to 7.500” ± 0.155”
7.501” to 10.000” ± 0.300”

Total Coils/Free Position Tolerances

±3/16 coil or reference if torque or rate needs to be met.

Rate Tolerances

Spring rate has a manufacturing tolerance of ±10%

Torque Tolerance

Torque has a manufacturing tolerance of ±10%

Standard Conical and Barrel Spring Tolerances

conical barrel spring dimensions standard tolerances

Small & Large Outer/Inner Diameter

0.025” to 0.050” ± 0.002”
0.051” to 0.100” ± 0.003”
0.101” to 0.250” ± 0.005”
0.251” to 0.500” ± 0.008”
0.501” to 0.850” ± 0.015”
0.851” to 1.125” ± 0.020”
1.126” to 1.250” ± 0.025”
1.251” to 1.480” ± 0.030”
1.481” to 1.750” ± 0.040”
1.751” to 2.000” ± 0.055”
2.001” to 2.250” ± 0.065”
2.251” to 2.500” ± 0.075”
2.501” to 2.750” ± 0.090”
2.751” to 3.000”± 0.115”
3.001” to 3.500” ± 0.130”
3.501” to 4.000” ± 0.160”
4.001” to 4.375” ± 0.190”

Wire Diameter Tolerances

Note: China Spring Products Corp does not manufacture the wire used to manufacture springs.

The following tolerances apply for the following wire types:

Hard Drawn HD A679
Hard Drawn ASTM A227
Music Wire ASTM A228
Oil Tempered MB A229
Carbon Valve A230
Phosphor Bronze Grade A B159
Beryllium Copper B197
Stainless Steel 17-7 ASTM A313
Stainless Steel 302 ASTM A313
Stainless Steel 316 ASTM A316

0.005” to 0.018” ± 0.0005”
0.019” to 0.040” ± 0.0006”
0.041” to 0.0625” ± 0.0007”
0.063” to 0.090” ± 0.0008”
0.091” to 0.125” ± 0.0009”
0.126” to 0.250” ± 0.001”
0.251” to 0.375” ± 0.00125”
0.376” to 0.500” ± 0.001375”
0.501” to 0.625” ± 0.0015”

The following tolerances apply for the following wire types:

Chrome Silicon A401
5160 H

0.100” to 0.125” ± 0.0009”
0.126” to 0.250” ± 0.001”
0.251” to 0.375” ± 0.00125”
0.376” to 0.500” ± 0.001375”
0.501” to 0.625” ± 0.0015”
0.626” to 0.750” ± 0.0016”
0.751” to 1.250” ± 0.0017”

Free Length Tolerances

0.001” to 0.500” ± 0.015”
0.501” to 1.000” ± 0.025”
1.001” to 2.000” ± 0.035”
2.001” to 4.000” ± 0.050”
4.001” to 8.000” ± 0.125”
8.001” to 10.000” ± 0.200”
10.001” to 15.000” ± 0.300”
15.001” to 20.000” ± 0.400”
20.001” to 25.000” ± 0.550”
25.001” to 30.000” ± 0.700”
30.001” to 35.000” ± 0.900”
35.001” to 40.000” ± 1.100”
40.001” to 48.000” ± 1.250”

Total Coils Tolerances

±¼ coil or reference if load or rate needs to be met.

Rate Tolerance

Spring rate has a manufacturing tolerance of ±10%

Working Loads Tolerance

Working loads has a manufacturing tolerance of ±10%

Standard Garter Spring Tolerances

garter spring dimensions standard tolerances

Outer/Inner Diameter Tolerances

0.040” to 0.050” ± 0.002”
0.051” to 0.100” ± 0.003”
0.101” to 0.250” ± 0.005”
0.251” to 0.500” ± 0.008”
0.501” to 0.850” ± 0.015”
0.851” to 1.125” ± 0.020”
1.126” to 1.250” ± 0.025”
1.251” to 1.480” ± 0.030”
1.481” to 1.750” ± 0.040”
1.751” to 2.000” ± 0.055”
2.001” to 2.250” ± 0.065”
2.251” to 2.500” ± 0.075”
2.501” to 2.750” ± 0.090”
2.751” to 3.000”± 0.115”
3.001” to 3.500” ± 0.130”
3.501” to 4.000” ± 0.160”
4.001” to 4.500” ± 0.190”
4.501” to 5.000” ± 0.225”
5.001” to 5.500” ± 0.250”
5.501” to 6.000” ± 0.280”
6.001” to 6.500” ± 0.310”
6.501” to 7.000” ± 0.350”

Working Loads Tolerance

Working loads has a manufacturing tolerance of ±10%

Garter Spring Outer Diameter Tolerances

3.000” to 5.000” ± 0.250”
5.001” to 7.500” ± 0.375”
7.501” to 10.000” ± 0.500”
10.001” to 12.500” ± 0.750”
12.501” to 15.000” ± 0.875”
15.001” to 20.000” ± 1.000”
20.001” to 25.000” ± 1.250”
25.001” to 30.000” ± 1.500”

Length Tolerances

0.001” to 0.500” ± 0.015”
0.501” to 1.000” ± 0.025”
1.001” to 2.000” ± 0.035”
2.001” to 4.000” ± 0.050”
4.001” to 8.000” ± 0.125”
8.001” to 10.000” ± 0.200”
10.001” to 15.000” ± 0.300”
15.001” to 20.000” ± 0.400”
20.001” to 25.000” ± 0.550”
25.001” to 30.000” ± 0.700”
30.001” to 35.000” ± 0.900”
35.001” to 40.000” ± 1.100”
40.001” to 48.000” ± 1.250”

Rate Tolerances

Spring rate has a manufacturing tolerance of ±10%

Wire Diameter Tolerances

Note: China Spring Products Corp does not manufacture the wire used to manufacture springs.

The following tolerances apply for the following wire types:

Hard Drawn HD A679
Hard Drawn ASTM A227
Music Wire ASTM A228
Oil Tempered MB A229
Carbon Valve A230
Phosphor Bronze Grade A B159
Beryllium Copper B197
Stainless Steel 17-7 ASTM A313
Stainless Steel 302 ASTM A313
Stainless Steel 316 ASTM A316

0.005” to 0.018” ± 0.0005”
0.019” to 0.040” ± 0.0006”
0.041” to 0.0625” ± 0.0007”
0.063” to 0.090” ± 0.0008”
0.091” to 0.125” ± 0.0009”
0.126” to 0.250” ± 0.001”
0.251” to 0.375” ± 0.00125”
0.376” to 0.500” ± 0.001375”
0.501” to 0.625” ± 0.0015”

The following tolerances apply for the following wire types:

Chrome Silicon A401
5160 H

0.100” to 0.125” ± 0.0009”
0.126” to 0.250” ± 0.001”
0.251” to 0.375” ± 0.00125”
0.376” to 0.500” ± 0.001375”
0.501” to 0.625” ± 0.0015”
0.626” to 0.750” ± 0.0016”
0.751” to 1.250” ± 0.0017”