Extension spring

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1. Spring Specification

Dimension:

1. Spring Type: Extension spring.

2. Material: high carbon spring steel; music wire; stainless steel(SUS301,302,304,316,201,202);alloy steel(60Si2MnA,55CrSi,50CrV,60SiCr8A);copper wire ,iron wire ,

3. Wire Diameter: 0.1-65.0mm

4. Surface treatment: become black, Zinc/ Nickel/Silver/Golden/Tin plated ,polishing ,anti-rust oil, passivation ,powder coating, shot blasting

5. Certification: ISO9001:2000, ROHS

6.Packing :Inner plastic bags and outer cartons ,shipping with plastic pallet

7.OEM and ODM is accepted.
Can made by your drawings, sample and dimension

9. Advantage: Good hardness, resistance, durable.

10. Payment:T/T, Western Union, Paypal.

11. MOQ: 5000pcs

12. Delivery time: 7-15 days after receiving your payment.

13. Application: Widely used in automobiles, motorcycles, electrical appliances, telecommunication, craft, toys ,locks,stationery,furiture ,washing machines,vacuum cleaners,lamps and lanterns,bicycles,sports equipment ,etc

Formula:

1) OD=ID+d (OD: outside diameter; ID=inside diameter; D_m=mean diameter; d=wire diameter)

2) F=Gd⁴*f/8D_m³N_act(F= load; G=gravity; f=deflection; N_act=active number of coil)

3) F'=F/f (F'=Spring rate)

Dimension:
Spring Type	Extension spring.
Load Type	Compression
Material	high carbon spring steel; music wire; stainless steel(SUS301,302,304,316,201,202); alloy steel(60Si2MnA,55CrSi,50CrV,60SiCr8A); copper wire ,iron wire
Wire Diameter	0.1-65.0mm
Surface treatment	become black Zinc/ Nickel/Silver/Golden/Tin plated polishing anti-rust oil passivation powder coating shot blasting
Type of Loops	Crossover Loops Double Twisted Loops Extended Loops Full Loops On the Side Full Loops Over Center Machine Full Loops Machine Half Loops Double Full Loops . Etc
form of ends	open / closed / ground or not
Certification:	ISO9001:2000, ROHS
Packing	Inner plastic bags and outer cartons ,shipping with plastic pallet
OEM&ODM	OEM and ODM is accepted. Can made by your drawings, sample and dimension
Advantage	Good hardness, resistance, durable，high fatigue strength
Payment:	T/T, Western Union, Paypal.
MOQ	5000pcs or according to your requirement
Delivery time:	7-15 days after receiving your payment.
Application	Widely used in automobiles, motorcycles, electrical appliances, telecommunication, craft, toys ,locks,stationery,furiture ,washing machines,vacuum cleaners,lamps and lanterns,bicycles,sports equipment ,etc
Formula:
1) OD=ID+d (OD: outside diameter; ID=inside diameter; D_m=mean diameter; d=wire diameter)
2) F=Gd⁴*f/8D_m³N_act(F= load; G=gravity; f=deflection; N_act=active number of coil)
3) F'=F/f (F'=Spring rate)

2. Packing

Inner plastic bags and outer cartons, shipping with plastic pallet

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