Brief details

Description:   constant force compression spring
Material: 60Si2Mn 
Specification: Wire diameter= 4.5 x 4.5mm , OD=20
Ends type : default
Surface finish:  none
Capacity: Wire diameter ranging from  0.08-8.0 mm
Wire shape option : Coil,flat , rectangular,square, triangular. etc
Material option:
Stainless steel :SUS301(1.4310),SUS302(1.4307),SUS304,SUS316,SUS631(17-7ph),X-750
Carbon steel:  SWC-72A,SWC-65Mn, 60Si2Mn, 55CrSi(55SiCr),SAE1070,SWPB(Music wire), EN10270-1 SH, DIN 17223, ASTM-A228 .etc
Copper/Brass:  Brass(CuZn36,CuZn40),copper(C1100), phosphor  bronze   copper(CuSn6), beryllium bronze copper,enamelled wire .etc
Alloy:  titanium alloy etc.
Surface finish option: Nickel plating, chrome plating, zinc plating, galvanization ,passivation, ultrasonic washing,silver plating,gold plating,electrophoresis, phosphorization, dacromet, teflon coating etc 
Application:  Aviation,automotive, motorbike, bicycle, automatic equipment, household appliance, medical device ,toy, telecommunication, computer, instrument and meter,furniture, electric tools,mold and  other industries 
Advantage: We are good at producing  high-difficult,extremely-accurate, reliable products,and providing innovative solution, Solid service  for you! 
Engineering: Product analysis , design, test, validation etc
Manufacturing Machines : CNC spring formers, tempering furnace, ends grinder, shot-blasting, lathes ,millers, punches etc.Test equipmentsProjector , digital hardness tester,digital torsion strength tester. digital tension and compression strength tester . elasticity tester. life tester , salt spray test machine etc.
Quality control:
1. PPAP.APQP,SPC,FMEA,MSA  quality management. 
2. Tolerance control :  DIN, JIS  Standard. 
3. Manufacturing processes  inspection per hour and per batch. 
4. Traceable  management   thoughout all process from raw material to customers. 
Certification : ISO9001,TS16949, RoHS compliant  .

Packing :
1.Two layers hard carton box suitable for oversea transit,
2.Pallet: it is fumigation free ,suitable for export .