A   spring  is  an  elastic  member  which  store  energy  and  provides  a  force  over  a   distance  by  elastic  compression.  Spring  have  ability  to  withstand  relatively  large  compressions  elastically.  Today  springs  find  tremendous  applications  in  engineering   and  other  areas,  which  makes  wide  variety  of  springs  both  in  size  and  shapes.  Springs  are  mainly  used  for  following  functions.

1]  To  cushion,  absorb  or  springs  or  control  the  energy  either  due  to   shock  or  vibration  as  in        railway  wagons,  automobiles,  shock absorbers, press tools etc.
2]  To  exert  a force  as  in  spring  loaded  safety valve, clutches etc.
3]  To  support  moving  masses  or  to  isolate  vibrations.
4]  To  store  energy, - that  way  spring  find  use  in  clocks, toys,  machines etc.
   
Springs  are  classified  according   to  their   shapes  and  type  of  stress  they  have  to  withstand. 
Following  are  main  types  of  springs,

1]  Compression  Springs. 
2]  Tension  Springs.
3]  Spiral  Spring.
4]  Disc  Spring.
5]  Spring  rings  and  bars

In  this  catalogue  we  are  mainly  provided  details  of  compression  springs  used  for  following  applications.

1]  Press  tool  dies  for  sheet  metal  working.
2]  Moulds  for  plastic  injection  moulding.
3]  Jigs,  Fixtures  and  machine  tools.  

     Guid Line - Spring selection and operating condition

1. Select the spring carefully at the design stage,

2. For longer stroke - select light load or medium load spring,

3. For more load - select heavy load or extra heavy load springs,

4. Calculate spring stroke (required defection.)

5. Preloading deflection should be equal to 5 % of the length.

6. Use guid pin, a locating bore as a guid - this is essential for spring having a free length / diameter ratio exceeding 3.5

7. If possible use longer springs for lower loadings.

8. Never compress springs beyond the maximum operating load and compression.

9. Always check spring holder heights and working strokes of moving elements after die tools has been reground.

10. Protects springs from Corrosive agents.

11. Do not exceed a working temperature of 250⁰ C, No significant load reduction occurs up to 120⁰ C beyond this Temperature an average loss of 1 % for every 40⁰ C must be calculated.

12. Do not replace one spring at a time, if they are multiple in use.

13. Do not alter physical characteristics of sprints like cutting of Coils, grinding of internal or external diemeter.