Tension Springs Heavy Load

◇ Made of quality materials, the Economy series tensile springs have been localized, which greatly reduces the cost, and their cost efficiency is higher thanks to Misumi’s higher quality control performance.
◇ Stainless steel materials are imported from Japan, and anti-rust resistance is high. Stainless steel springs are also magnetic. Please be careful.
◇ Misumi's Economy series tensile springs have been standardized in specifications, that is, the maximum load of the same diameter is a certain value. Initial tension, and the spring coefficient is a reference value.

L = Free length D ≤ φ18mm (±1.0)
       D ≥ φ18mm (±1.5)

Shape	Material
C-BUT C-AUT	SUS304-WPB
C-BWT C-AWT	Spring Steel

  

Type	Coil Outer Diameter D — Free Length L		Wire Diameter dmm	Under Dynamic Load		(Initial Tension) N	(Spring Constant) N/mm
				Maximum Displacement Fmax. Mm	Maximum Load N
C-AWT (Spring Steel) C-AUT (SUS304-WPB) C-BWT (Spring Steel) C-BUT (SUS304-WPB)	3—	10	0.5	2	8.8	2.16	3.24
		15		3.7			1.77
		25		6.8			0.98
	4—	15	0.6	4	11.1	2.55	2.16
		20		6.4			1.37
		30		10.9			0.78
	5-	15	0.8	2.9	20.79	5.1	5.39
		20		4.6			3.43
		25		6.4			2.45
		30		8.4			1.86
		35		10			1.57
		45		13.3			1.18
	6-	20	1	3.7	33.15	8.6	6.57
		25		5.3			4.61
		30		6.9			3.53
		35		8.3			2.94
		40		10			2.45
		55		14.3			1.71
	8-	25	1.2	5.3	41.19	9.81	5.88
		30		7.3			4.31
		35		9.1			3.43
		40		11.9			2.65
		50		15.5			2.06
		60		18.8			1.67
	10-	30	1.6	5.2	77.47	20.59	10.89
		35		6.8			8.34
		40		8.4			6.77
		45		10			5.69
		50		11.6			4.9
	12-	40	2.0	6.6	120.62	34.3	13.04
		45		7.7			11.18
		50		9.4			9.22
		60		12.1			7.16
		70		14.9			5.79
	14-	60	2.3	10.9	154.95	45.11	10.1
	16-	55	2.6	9.0	195.15	55.9	15.49
		100		22.4			6.18
		125		28.4			4.90
	18-	125	2.9	27.1	236.34	68.65	6.19
	24-	80	4.0	11.7	430.51	123.6	26.48

Load {kgf} = Load N × 0.101972

Tension spring (also known as draw spring) is a spiral spring which bears axial tension. It has side hooks at both ends to ensure the tension source of tension spring.
When not bearing load, the coils of tension spring are generally tight without clearance.
The working principle of tension spring is to act in reverse when stretching or pulling away, and to work by using the resilience (pulling force) after stretching, so as to control the movement of machine parts, absorb and store energy, measure the force and so on.

■ Corrosion resistance: 72-hour salt spray test
 
· Conclusion: Rust resistance is 9 times that of market products
· Differences between economy extension springs, standard products, and market-available products

· Product information: Material: SUS304-WPB
      Specifications: Wire diameter 1 mm, outer diameter 8 mm, free length 40 mm
· Test conditions: Initial length 40 mm, allowable displacement 19.2 mm, allowable load 24.52N, stretching frequency 309 times/minute


· Conclusion: Service life is 3.08 times that of market products
*Products circulating on the market are similar products randomly purchased by our company from online or offline markets
* The test data are obtained through testing by our company, which are for reference only

[Precautions for Use]
▶Operating temperature
SWP-A type: Room temperature (0–40°C)
Stainless steel type: -10–100°C
*If used under conditions exceeding the above temperature, the load value may decrease depending on the usage conditions.
*When used in an environment with high and low temperature differences and humidity such as outdoors, it is recommended to choose stainless steel products.

▶Approximate usage standard: around 1,000,000 times
*The above number of times is for reference only. The number of times of use varies with the tensile direction, operating temperature/environment, and amount of deformation. To increase the usage count, it is recommended to use the spring up to 70% of the allowable displacement Fmax..

▶Others
· Use within the allowable displacement Fmax. (mm). If it is used under the condition of exceeding the allowable displacement, the spring may be deformed, or damaged after using only a limited number of times. Please also be careful not to stretch the tensile spring beyond the allowable displacement when installing it.
· Stainless steel springs are also magnetic. Please be careful.