*We spent more than 30 years with springs
*We can manufacture all kinds of springs
*Minimum Order is 500~1000 pcs,* Welcome small quantity,
*On receipt of the payment,the order shipping will be made within 2 days
*If you have more smaller orders, please  contact me

                                                  If  you purchase many kind of goods from us,

                                                  The prices and shipping can be reduced.
                                                  If you want to receive the product quickly, please contact us

                                                                                          

Quantity: 10
O.D.: 7mm/0.275inch
I.D.: 5.8mm/0.228inch
Wire Diameter: 0.6mm/0.024inch
Free Length: 21mm/0.826inch
Material: SUS304-WPB

Distinguishing Features:
Both ends are closed but are NOT ground square. 
 
 
for spring load
Spring force is dependent on the distance it is displaced (compressed or extended). 
                    
Calculating the load
Compression springs - To find the load at any working length, when free length
and rate are given, use the formula:
P = R x F
where P is the load in lbs; R is the rate in lbs per inch;
      F is the deflection from free length.
Example: Given a free length of .750" and a rate of 22 pounds per inch,
         find the load at .500" working length.
         P = 22 x (.750-.500) = 22 x .250 = 5.5lbs

Extension springs - To find the load at any working length,
when the free length, rate and initial tension are given, use the formula:
P = (R x F) + I.T.
where P is the load in lbs; R is the rate in lbs per inch;
      F is the deflection from free length; I.T. is the initial tension.
Example: Given a free length of 1", a rate of 6.9 pounds per inch,
         and .7 pounds initial tension, find the load at 1.500".
         P = [6.9 x (1.500-1.000)] + .7 = (6.9 x .500) + .7 = 3.45 + .7 = 4.15 lbs

Determining rate
How to determine rate - Rate, which is the change in load per unit deflection,
                        may be tested by the following procedure:
1. Deflect spring to approximately 20 percent of total available deflection (free length, minus solid height)
   and measure load (P1) and spring length (L1).
2. Deflect spring not more than 80 percent of total available deflection and measure load (P2)
   and spring length (L2). Be certain that no coils (other than closed ends) are touching at L2.
3. Calculate rate (R) lb. per in.
   R = (P2 - P1) / (L1 - L2)
 
 
Please know that springs purchased from us will be shipped direct
from manufacturer.
If you have any questions concerning this or other items
please don't hesitate to email me for an answer
 We will do our best to email you a reply
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We ship not just goods but also serve the best service to satisfy our customers.
*** Shipping
The shipping time and rate vary by destination country.
The estimated delivery time is as below.
However the shipping may take longer than usual due to the customs of your country.
Express shipping is available with additional charge.
It usually takes 11 to 23 days to delivery