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Stock Spring Tolerances and Engineering Notes

Imperial/Metric Conversions

Force

To Convert Newtons to Kilogrammes Pounds
Multiply by 0.102 0.22487
To Convert Kilogrammes to Newtons Pounds
Multiply by 9.807 2.2046
To Convert Pounds to Newtons Kilogrammes
Multiply by 4.448 0.4536

Rate

To Convert kg/mm to lb/in N/mm
Multiply by 55.998 9.807
To Convert lb/in to kg/mm N/mm
Multiply by 0.017858 0.175133
To Convert N/mm to kg/mm lb/in
Multiply by 0.101968 5.7099

Length

To Convert Inches to Meters Feet Millimetres
Multiply by 0.0254 0.08333 25.4
To Convert Millimetres to Meters Feet Inches
Multiply by 0.001 0.003281 0.0393701

Stock Compression Spring and Extension Spring Engineering Notes and Tolerances

General Notes

Direction of Wind

Left or Right at Lee Spring’s Discretion

Compression Spring Ends

  • Squared and ground (squareness within 3°:Standard Springs (LC, LCM), Heavy Duty Springs (LHC), High Pressure (LHP), DIN-PLUS Part 1
  • Squared, Not Ground: Bantam Mini Compression Springs (CB, CBM), Instrument Springs (CI, CIM), Lite Pressure Springs (LP), DIN-PLUS Part 2

Extension Spring Ends

  • Full diameter at random position, except those LEM products designed to meet DIN 2097 Standards
  • Loop openings are approximately one wire diameter.

Stock Compression Outside Diameter (OD) Tolerances*

Imperial/Inch

.025" to .039" ± .002"
.040" to .118" ± .003"
.120" to .250" +.003" / -.005"
.251" to .299" ± .005"
.300" to .500" ± .008"
.501" to .850" ± .015"
.851" to 1.125" ± .020"
1.126" to 1.218" ± .025"
1.250" to 1.460" ± .030"
1.480" to 1.687" ± .040"
1.937" to 2.000" ± .055"

Metric

0.64mm to 0.99mm ± .05mm
1.02mm to 3.00mm ± .08mm
3.05mm to 6.10mm +.08mm / -.13mm
6.38mm to 7.59mm ± .13mm
7.62mm to 12.70mm ± .20mm
12.73mm to 21.59mm ± .38mm
21.62mm to 28.58mm ± .51mm
28.60mm to 30.94mm ± .64mm
31.75mm to 37.08mm ± .76mm
37.59mm to 42.85mm ± 1.02mm
49.20mm to 50.80mm ± 1.40mm

Spring rate: ± 10% ; Solid Height Tolerance: +5%, no lower limit
*Except where noted to meet DIN 2098
This O.D. table not applied to Lite Pressure, HEFTY Die, REDUX, or MIL-SPEC

Stock Lite Pressure (LP Series) Outside Diameter (OD) Tolerances

Imperial/Inch

.201" to .300" ± .008"
.301" to .500" ± .010"
.501" to .850" ± .020"
.851" to 1.125" ± .025"
1.126" to 1.460" ± .030"
1.461" to 1.687" ± .040"
1.688" to 1.937" ± .055"
1.938" to 2.375" ± .070"
2.376" to 2.875" ± .090"

Metric

5.11mm to 7.62mm ± .20mm
7.65mm to 12.70mm ± .25mm
12.73mm to 21.59mm ± .51mm
21.62mm to 28.58mm ± .64mm
28.60mm to 37.08mm ± .76mm
37.11mm to 42.85mm ± 1.02mm
42.88mm to 49.20mm ± 1.40mm
49.23mm to 60.33mm ± 1.78mm
60.35mm to 73.03mm ± 2.29mm

Spring rate: ± 10%

Stock MS24585 Compression Outside Diameter (OD) Tolerances

Imperial/Inch

.120" to .240" ± .005"
.300" to .500" ± .008"
.550" to .850" ± .015"

Metric

3.05mm to 6.10mm ± .13mm
7.62mm to 12.70mm ± .20mm
13.97mm to 21.59mm ± .38mm

Spring rate: ± 10%
Solid Height Tolerance: Max, no lower limit

Stock Extension Outside Diameter (OD) Tolerances*

Imperial/Inch

.063" to .098" ± .004"
.109" to .299" ± .005"
.300" to .500" ± .010"
.501" to .850" ± .015"
.851" to 1.125" ± .020"
1.126" to 1.250" ± .030"
1.251" to 1.500" ± .040"
1.501" to 1.750" ± .050"
1.751" to 2.000" ± .055"

Metric

1.60mm to 2.50mm ± .10mm
2.77mm to 7.59mm ± .13mm
7.62mm to 12.70mm ± .25mm
12.73mm to 21.59mm ± .38mm
21.62mm to 28.58mm ± .51mm
28.60mm to 31.75mm ± .76mm
31.78mm to 38.10mm ± 1.02mm
38.13mm to 44.45mm ± 1.27mm
44.48mm to 50.80mm ± 1.40mm

Spring rate: ± 10%
*Except where noted to meet DIN 2097 or MIL-SPEC

Stock MS24586 Extension Outside Diameter (OD) Tolerances

Imperial/Inch

.120" to .240" ± .005"
.300" to .500" ± .008"
.650" to 1.000" ± .015"

Metric

3.05mm to 6.10mm ± .13mm
7.62mm to 12.70mm ± .20mm
16.51mm to 25.40mm ± .38mm

Spring rate: ± 10%
End Hooks Position: Inline within 22°
Relative Position of End Hook Openings is Factory Optional

 

Stock Torsion Engineering Notes and Tolerances

General Notes

  1. Lengths of legs are shown as "A" in sketches below.

  2. Please note: "R" (radius in inches) where force is applied is always 1/2 of "A" (Length of Leg). Dotted lines of legs show loaded position where values of "T" (Torque) will be achieved at "R" (Radius).

  3. To translate torque values to direct load: Use Formula - P = T/R P = Load applied at Radius (R) T = Torque Example: Part LTL 012A 01, what is the load where R = .187? Using P = T/R = .050/.187 = .267lbs.

  4. To calculate torque values other than those listed (Position of Ends), a direct proportion may be used. Example: Part LTL 012 A 01. Torque shown in catalogue listing is .050 in-lbs. for 90° deflection; therefore, torque for 45° would be .025 in-lbs.

  5. Inspection of Load - Loads should always be checked at the Radius ("R" value)

    inspection
  6. Mandrel Size: Generally, torsion springs are used over a mandrel (shaft or arbor). The column "Suggested Mandrel Size, Inches", allows approximately a 10% clearance for the various deflections shown in examples below. If you require greater deflections, we suggest a suitable reduction in the mandrel size.

  7. Direction of Wind: Good design dictates that torsion springs should be used in the direction that winds the coil. When ordering be sure to choose either LTL (Left Hand Wound) or LTR (Right Hand Wound) for required application.

    direction

Stock Torsion Outside Diameter (OD) Tolerances

Imperial/Inch

.093" to .125” ± .004”
.126" to .200” ± .005”
.201” to .300” ± .007”
.301” to .410” ± .010”
.411” to .500” ± .013”
.501” to .700” ± .015”
.701” to .875” ± .020”
.876” to 1.125” ± .025”
1.126” to 1.218” ± .030”
1.219” to 1.250” ± .035”
1.251" to 1.360" ± .040"
1.361" to 1.520" ± .045"
1.521" to 1.750" ± .050"
1.751" to 2.000" ± .055"
Over 2.000" ± .060"

Metric

2.36mm to 3.17mm ± .10mm
3.18mm to 5.08mm ± .13mm
5.09mm to 7.62mm ± .18mm
7.63mm to 10.41mm ± .26mm
10.42mm to 12.70mm ± .33mm
12.71mm to 17.78mm ± .38mm
17.79mm to 22.23mm ± .51mm
22.24mm to 28.58mm ± .64mm
28.59mm to 30.94mm ± .76mm
30.95mm to 31.75mm ± .89mm
31.76mm to 34.54mm ± 1.02mm
34.55mm to 38.60mm ± 1.14mm
38.61mm to 44.45mm ± 1.27mm
44.46mm to 50.80mm ± 1.40mm
Over 50.80mm ± 1.52mm

Stock REDUX Wave Spring Engineering Notes and Tolerances

Torque: ± 10%
Tolerances on Free Position:
From 3 to 10 total coils (Incl.) ± 10°
From 11 to 20 total coils (Incl.) ± 15°

Stock REDUX Wave Spring Engineering Notes and Tolerances

General Notes

  1. Stock REDUX Wave Springs are made of material 17-7PH Stainless Steel

  2. Maximum operating temperature is 650 degrees F

  3. Nominal Load is the approximate force at the Working Height. Be advised springs may take a set if compressed below the Working Height.

  4. The Number of Turns comprises a continuous coil; there is no welding or adhesive between waves.

  5. Ends turns are regular & wavy. Flat & shim ends can be offered in a special order.

Stock REDUX Wave Spring Tolerances

Rate: ± 25%

The Outside Diameter and Inside Diameter are reference only. REDUX Wave Springs are manufactured to operate with the specified mating Hole Diameter and Rod Diameter.

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