4 1/4 Inch Cone Spring for Bi-Fold Top Pivot Rod¹

Product Description Product Description4 1/4 inch cone spring for bi-fold top pivot rodDOFO Spring manufactures a wide range of sizes from large industrial springs to miniature compression springs.#1 ATTN: Read This Before Buying A. Due to the internet and computer display solutions. The actual products may differ fromthe pictures. Please contact our salesmen for further assistance.B. All the extension springs, compression springs, torsion springs, wire forms can be made in customized demands.C. We appreciate Drawing-Guide Production, Please send us a spring drawing as possible as you can when you inquiry.D. We appreciate your inquiries and you are welcome all the time!For a better understanding of your demand, please learn the basics of compression spring manufacturing.#2 Working Drawing of a Compression spring#3 Different End Types of Helical Compression springsThere are basically four types of ends, closed & ground, closed & not ground ends, open & ground ends, and open & not ground ends. Below is a diagram for illustration. #4 Different Shapes and Applications of Helical Compression SpringCompression springs are helical or spiral-like-springs. They demonstrate an open-coiled design and react to axis forces to store and return energy. Manufacturers build compression springs into a variety of products, such as Automobile suspensions, Couches, Mattresses, Vending machines, Medical devices, Pacemakers, Pens, Hydraulic, Medical, Lawn equipment, Firearms, Marine industry, Underwater oil rig piping, WatchesDifferent products require different shapes to meet their demand. The below diagram covers the common shapes of compression springs, such as conical spring, barrel spring, variable pitch spring, straight coil spring(cylinder spring) which are the most common springs, etc.#5 Available Coating MethodDue to the government's environment policy, all the coating materials are prior to RoHS standards. Please take RoHS standard coating as possible as you can.Coating MethodCostDoes it Meet the RoHS requirement?RemarkUnplatedNoneYes Anti Rust OilLowestYes Black Oxide/OxideLowerYes Normal Zinc coatingnormalNo Trivalent Zinc coatingHighYesNormally 8~10μ thickness, 48 hours without white rustNickel PlatednormalYes ElectrophoresisHigherYes PaintingVery HighYesrequire a longer delivery timeStainless steel WashingnormalYes Stainless Steel Electro-polishHighestYesThis coating cost more than the others FAQDOFO Spring provides a win-win service. Below we list answers to some of the questions our customers frequently asked. For anything unsure, please contact us, and we will respond within 12 hours.Q: Which kind of materials are available? Do they meet RoHS certification?A: DoFo Spring is able to manufacture different spring types of compression springs, extension springs, torsion springs, wire forms with a large range of High-Grade Spring Steel - Carbon steel - Stainless steel - Music Wire, all comply to the RoHS standard. The wire diameter is available from 0.001 inches to 0.075 inches, which can meet the requirement of different applications. All the spring materials meet European RoHS certification.Q: Do you support orders in small quantity or do you only accept large runs?A: DoFo Spring manufactures large quantity springs, small quantity springs based on your demand.  We will work with you to choose the most effective solution.Q: Does DOFO spring offer DESIGN OR initial ASSISTANCE ON SPRINGS?A: Our engineers could help with the design with the drawing and advise to lower the production cost. Our engineer has years of experience in spring design. We could provide drawing format in CAD, 3D, and 2D design layout as well as prototype development.Q: What is the typical lead time for custom springs?A: The lead time varies in custom springs. For compression springs, extension springs, torsion springs, wire forms in our mold range, we are able to deliver within 25 days. However, for some complex shapes of springs, the delivery time would be around 30~40 days.Q: Do you charge custom spring samples?A: We make the custom springs sample charge as a subscription of formal order. In other words, the sample charge could be refunded when we receive the order. However, if your sample requires an additional mold, we will charge it.Q: If we order large quantity springs, will you house the springs, wire forms, and ship to us based on a required basis?A: Our warehouse provides specific stock service for long term business. You can make your shipment schedule on an annual, monthly basis. We will ship on a specific schedule.Q: What payment term do we accept for spring orders?A: We could accept payment terms based on T/T, L/C at sight, DP, Westunion. Company ProfileOur AdvantagesCertificationsIf any question, please contact us directly.

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