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Yellow Color Compression Springs OD 30mm 50CrVA Materials TF

Yellow Color Compression Springs OD 30mm 50CrVA Materials TF

  • Yellow Color Compression Springs OD 30mm 50CrVA Materials TF
  • Yellow Color Compression Springs OD 30mm 50CrVA Materials TF
  • Yellow Color Compression Springs OD 30mm 50CrVA Materials TF
Yellow Color Compression Springs OD 30mm 50CrVA Materials TF
Product Details:
Place of Origin: China
Brand Name: BD
Certification: RoHS
Model Number: BD~s0000
Payment & Shipping Terms:
Minimum Order Quantity: 50pcs each size
Price: Negotiation
Packaging Details: Carton, Size 30*20*20cm
Delivery Time: 10~15 work days
Payment Terms: Western Union, L/C, D/A, D/P, T/T
Supply Ability: 120000~150000 pieces per month
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Detailed Product Description
Material: 50CrVA Usage: Auto;Car,Mold Components, Die Parts
Color: Yellow Product Name: Mold Springs
Loading Max: 72KG Load Type: Compression
High Light:

OD 30mm Compression Springs


50CrVA Compression Springs


72KG Loading Mold Springs

Yellow Color Compression Springs OD 30mm 50CrVA Materials TF


How to choose the spring for my mold

 1. OD 

     OD =2*ID, so  the OD of spring shoulder be twice of your pins 

     The inner diameter of our mold spring are positive tolerance, e,g.: the diameter of pins is 7.5mm, the OD of spring should be 15mm, we have the standard size 14mm spring only and it is useable.

  2. Length

      Free length =(stroke + pre-compressed length)/Compression ratio

      Pre-compressed length usually is 10% of the free length. 

     Compression ratio is according to the lifetime, as shown in the table below:


Loding color   lifetime and compression ratio max compression
300000 500000 1000000
lighter yellow 50% 45% 40% 58.0%
light blue 40% 36% 32% 48.0%
middel red 32% 28.8% 25.6% 38.0%
heavy green 24% 21.6% 19.2% 28.0%
super-heavy brown 20% 18% 16% 24%


  3. Color and loading

      Elastic force=spring constant * compressed length

      Generally speaking, the elastic force when the spring is pre-compressed should bigger than 2~2.5 times the weight of the ejector plate,  the elastic force when the spring is compressed should bigger than 1.3 times of all the pressure on it, of course, the force is shared by all springs, so pay attention to the number of them

Yellow Color Compression Springs OD 30mm 50CrVA Materials TF 0

Details of The Compression Springs

Materials OD / mm ID / mm Length / cm Color Loading Standard
50CrVA 30 15~15.5 2.5~30 Yellow TF Max 72Kg JIS

Constant and Free length of this Compression Springs


free length mm 25 30 35 40 45 50 55 60 65 70
spring constant N/mm 56.88 47.07 40.5 35.3 31.48 28.24 25.79 23.54 21.77 20.1


free length mm 75 80 90 100 125 150 175 200 250 300
spring constant N/mm 18.93 17.65 15.69 14.12 11.28 9.41 8.04 7.06 5.69 4.71


Materials of Compression Springs


    1. 65Mn 

​   The strength is relatively low, with a certain degree of toughness and plasticity, and the elastic coefficient is equivalent to that of alloy spring steel. But the hardenability is poor, mainly used for smaller size springs, injection mold springs.

     Tensile Strength  ≥735MPa

     Yield Strength ≥430MPa 

     Elongation δ10 (%):14~21.5

     Application: Can be competent for general injection molds, low price is its core competitiveness


    2.  55Si2Mn 

   The 55Si2Mn spring steel  has high strength, good elastic limit, high yield ratio, good toughness after heat treatment, and higher hardenability than 65Mn steel. It is suitable for the manufacture of flat springs with medium loads such as railway vehicles, automobiles, and tractors, and spiral springs with a diameter of less than 25mm. Cushion springs and cylinder safety valves are important springs that work under high stress, and can also be used as heat-resistant springs below 250°C.        

     Tensile Strength ≥1274MPa

     Yield Strength ≥1176MPa

     Elongation δ10 (%) ≥ 6%

     Application: Can be competent for all the injection molds and punching dies, anti-deformation ability is its core competitiveness



     3. 50CrVA

    The 50CrVa is a high-grade spring steel,  has higher toughness, strength and elastic limit, fatigue strength, lower elastic modulus, higher yield ratio and hardenability, and good impact toughness; suitable for manufacturing large cross-section high-load springs and valve springs and piston springs whose working temperature is not higher than 300℃;

     Tensile Strength ≥1274MPa

     Yield Strength ≥1127MPa

     Elongation δ5 (%) ≥10%

     Application: Can be competent for all the injection molds and  punching dies, especially for high temperature injection molds and large punching dies,  temperature resistance ability and high-loading are its core competitiveness

Yellow Color Compression Springs OD 30mm 50CrVA Materials TF 1

How to buy the mold springs
  • Please pay attention to our minimum order quantity.
  • All shipping terms are available, please contact us for shipping cost.
  • Prices can be negotiated for bulk order,

About the payment, T/T, PayPal and WestUnion is welcome, for the bulk order , please feel free to contact us for whlesale price.

T/T Paypal Western Union
Bank Name DBS Bank(Hong Kong) Limited First name: CAIXIA
Bank Address 11th Floor, The centre, 99 Queen's Road Central,Central,HongKong Last name: CHU
SWIFT Code DHBKHKHH Address: Xinqiao Street,Bao'an District, Shenzhen, China
Account Name XT Shenzhen Bede mold CO, Ltd
account NO. 79969019953
Contact: Name: Kerry Kim Telephone of office: +86 755 527084976
Mobile/ whatsapp:+8615915396878 Email:



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