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Specifications

 

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Imperial/Inches Metric
Physical Dimension

mm cm

Load

N kg gm

 
 

CI 012EF 12M

Cost
$0.00
$0.00
Price
$0.00
Weight
0.00 lb.
Direction of Wind
Factory Option
Ends
Squared
Finish
Pre-coated with Tin
Material
Music Wire
Total Coils
19.290
Product Series
Published Stock Code
CI012EF12M
Product Type
Compression Spring
Product Category
Stock
Revision
NR
Rate (N/mm)
0.06
Rate (kg/cm)
0.06
Rate (lb/in)
0.33
Rate (gm/mm)
5.89
Weight per Item (lb)
0.00
Material Specification
ASTM A228
Free Length (cm)
3.493
Free Length (inch)
1.375
Free Length (mm)
34.930
Free Length - Build Spec (in)
1.38
Free Length Tolerance (cm)
0.12
Free Length Tolerance (in)
0.05
Free Length Tolerance (mm)
1.22
Free Length Tolerance - Build Spec (in)
0.05
Hole Diameter (cm)
0.52
Hole Diameter (inch)
0.20
Hole Diameter (mm)
5.16
Inside Diameter (cm)
0.42
Inside Diameter (in)
0.16
Inside Diameter (mm)
4.17
Outside Diameter (cm)
0.478
Outside Diameter (in)
0.19
Outside Diameter (mm)
4.78
Outside Diameter - Build Spec (in)
0.19
Rate (gm/cm)
58.90
Rate (kg/mm)
0.01
Rate (N/cm)
0.58
Rate - Build Spec (lb/in)
0.33
Rate Tolerance (gm/cm)
5.89
Rate Tolerance (gm/mm)
0.59
Rate Tolerance (kg/cm)
0.01
Rate Tolerance (kg/mm)
0.00
Rate Tolerance (lb/in)
0.03
Rate Tolerance (N/cm)
0.06
Rate Tolerance (N/mm)
0.01
Rate Tolerance - Build Spec (lb/in)
0.03
Rod Diameter (cm)
0.40
Rod Diameter (inch)
0.16
Rod Diameter (mm)
3.96
Solid Height (cm)
0.64
Solid Height (inch)
0.25
Solid Height (mm)
6.37
Total Coils - Build Spec
19.29
Wire Diameter (cm)
0.03
Wire Diameter (inch)
0.01
Wire Diameter (mm)
0.30
Wire Diameter - Build Spec (in)
0.01
Hole Diameter - Build Spec. (in)
0.20
Rod Diameter - Build Spec. (in)
0.16
Rod Diameter Tolerance - Build Spec. (in)
MIN
Rod Diameter Tolerance (in)
MIN
Rod Diameter Tolerance (mm)
MIN
Rod Diameter Tolerance (cm)
MIN
Solid Height - Build Spec. (in)
0.25
Material Short Description
MW
Load at Solid Height (lb)
0.37
Load at Solid Height - Build Spec. (lb)
0.37
Load at Solid Height (N)
1.65
Load at Solid Height (kg)
0.17
Load at Solid Height (gm)
168.29
Active Coils - Build Spec.
17.29
Active Coils
17.29
Active Coils Tolerance - Build Spec.
Reference
Active Coils Tolerance
Reference
Product Series
Instrument Compression Series (inch)
Inside Diameter Tolerance (cm)
Reference
Inside Diameter Tolerance (in)
Reference
Inside Diameter Tolerance (mm)
Reference
Inside Diameter Tolerance - Build Spec (in)
Reference
Outside Diameter Tolerance (cm)
+0.008/-0.013
Outside Diameter Tolerance (in)
+0.003/-0.005
Outside Diameter Tolerance (mm)
+0.08/-0.13
Outside Diameter Tolerance - Build Spec (in)
+0.003/-0.005
Inside Diameter - Build Spec (in)
0.16
Outside Diameter Lower Tolerance (in)
0.01
Outside Diameter Upper Tolerance (in)
0.00
Outside Diameter Upper Tolerance (mm)
0.08
Outside Diameter Lower Tolerance (mm)
0.13
Model Code
CI

Instrument Compression Series (inch) Compression Springs

Precision Springs for Precision Products .

Lee Spring CI 012EF 12M is a precision compression spring from the Instrument Compression Series (inch), engineered for applications requiring reliable performance in moderate-load scenarios. This spring features an 0.188-inch outside diameter (4.78 mm) with a 0.203-inch hole diameter (5.16 mm) and extends to a free length of 1.375 inch (34.93 mm), making it ideal for instruments and assemblies where consistent and precise compression characteristics are critical. Made from Music Wire with a 0.012-inch wire diameter (0.3 mm), the spring delivers a spring rate of 0.33 lb/inch (0.058 N/mm) through its 17.29 active coils out of 19.29 total coils for predictable deflection behavior. The spring compresses to a solid height of 0.251 inch (6.37 mm) while supporting a maximum load of 0.371 lb (1.65 N) at full compression. The spring has Squared ends and a Pre-coated with Tin finish for optimal performance.

About the Compression Spring Instrument Series

The Lee Spring Instrument Series includes a wide range of size and rate combinations in a smaller, highly precise spring design. Selections are sorted in ascending order to mating hole/bore diameter sizes. Instrument Compression Springs are available in both inch and metric series. Inch Series springs are available in Music Wire, Type 302 Stainless Steel and Type 316 Stainless Steel. Metric Series springs are available in Music Wire and Type 302 Stainless Steel. The Music Wire springs are made from coated wire or provided with a plating finish for light corrosion resistance. The Type 302 Stainless Steel springs are passivated, while Type 316 Stainless Steel springs are passivated and ultrasonically cleaned. Lee Spring Instrument Compression Springs feature squared ends. A squared end, also called a closed end, is made by reducing the coil pitch of the ends to zero. Squareness influences how a force produced by the spring can be transferred to adjacent parts

Instrument Compression Series (inch) Compression Springs have useful applications in various industries, including:

  • Medical devices
  • Firearms
  • Pharmaceutical delivery devices
  • Lighting and electrical control
  • Petro-chemical processes
  • Communication devices
  • Aerospace
  • Testing and measurement equipment
  • Marine applications
  • Automotive
  • Locks and security devices
  • Precision Instruments
  • Hardware

...and many more applications

297221
Product Compression OD 0.188 in, Length 1.375 in, Music Wire
Product Compression OD 4.78 mm, Length 34.93 mm, Music Wire
Part Number CI 012EF 12M
Series Instrument Compression Series (inch)
Outside Diameter (inch) 0.188
Outside Diameter (cm) 0.478
Outside Diameter (mm) 4.78
Hole Diameter (inch) 0.203
Hole Diameter (cm) 0.516
Hole Diameter (mm) 5.16
Rod Diameter (inch) 0.156
Rod Diameter (cm) 0.396
Rod Diameter (mm) 3.96
Free Length (inch) 1.375
Free Length (cm) 3.493
Free Length (mm) 34.93
Rate (gm/mm) 5.89
Rate (kg/cm) 0.059
Rate (kg/mm) 0.0059
Rate (lb/inch) 0.33
Rate (gm/cm) 58.9
Rate (N/cm) 0.58
Rate (N/mm) 0.058
Solid Height (inch) 0.251
Solid Height (cm) 0.637
Solid Height (mm) 6.37
Wire Diameter (inch) 0.012
Wire Diameter (cm) 0.03
Wire Diameter (mm) 0.3
Material Music Wire
Load at Solid Height (gm) 168.29
Load at Solid Height (kg) 0.168
Load at Solid Height (lb) 0.371
Load at Solid Height (N) 1.65
Ends Squared
Active Coils 17.29
Direction of Wind Factory Option
Finish Pre-coated with Tin
Total Coils 19.29
0.012 0.188 0.003 0.005 0.203 0.156 1.375 0.048 19.29 0.33 0.033 0.2507 0.371 0.012 1.375 0.188 0.3 4.78 0.08 5.16 3.96 34.93 1.219 0.058 6.37 1.65
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Quantity Price
1 - 19 $7.680
20 - 49 $4.650
50 - 99 $2.350
100 - 199 $1.510
200 - 299 $1.151
300 - 399 $1.032
400 - 499 $0.930
500 - 599 $0.837
600 - 699 $0.756
700 - 799 $0.685
800 - 899 $0.627
900 - 999 $0.580
1000 $0.547

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