Custom Spring Manufacturer
We have been manufacturing steel springs since 1978. Compression, extension, torsion, conical and wire form springs across the 0.20 to 40 mm wire diameter range — from a sample, a technical drawing or dimensions, with no tooling dependency.
Who makes them
Metiş Yay is an independent manufacturer of steel springs in Biga, a district of Çanakkale in north-western Türkiye. Production began in 1978; the present plant has been running since 1998. Our main line of work is springs for agricultural implements and machinery, but the coiling line does not discriminate — automotive, white goods and general machinery springs are produced on the same line.
Biga is one of the few places in Türkiye where spring manufacturing is concentrated, with several spring makers in the district. The practical benefit of that concentration is in the supply chain: wire, heat treatment and coating services are all resolved within the same industrial area, which shortens lead times on custom work.
Our location has also shaped what we work on. Biga and its surroundings form a dense forage and cereal growing region, where balers, rotary rakes and seed drills are everyday equipment. That is why our catalogue runs deep in those machine groups — the products were shaped by demand coming in from the field.
What we make
The coiling line works across wire diameters from 0.20 mm to 40 mm. That range covers everything from wire form parts as fine as a clock spring to heavy duty springs on a cultivator leg.
- Compression springs — cylindrical springs compressed under axial load. The calculator on this site works out spring rate, working length and a Wahl-corrected safety factor for this type.
- Extension springs — with hooks or loops, carrying initial tension. The hook is the most highly stressed region of the spring; most failures start there rather than in the body.
- Torsion springs — the body twists and the leg bends. Every pickup and rake group on agricultural machinery belongs to this family.
- Conical springs — coil diameter varies along the length. Chosen for resistance to buckling and for the small solid height when closed.
- Wire form parts — hairpins, R clips, D pins, S hooks, swallowtail and U form parts. More a matter of bending geometry than of spring calculation.
How custom production works
Working without tooling dependency means this in practice: you do not need to commission tooling for a spring that is not on the list. Production can start from any one of three inputs.
The sample route is the most certain — the old spring itself is sent and dimensions are taken from it. The drawing route suits series production and machinery manufacturers. The dimensional route is the quickest: wire diameter, outside diameter, free length and coil count on compression and extension springs; on torsion and form springs, leg length and leg angle as well.
If you cannot measure, a photograph of the old part next to a ruler works for most items. The quote form accepts file attachments, so a photograph, a technical drawing or the drawing sheet produced by the calculator can be attached directly.
What determines the lead time
Lead time is not a single number — it follows the job, which is why no fixed day count is printed here. What drives it is clear enough, though: the six items below directly shape the date we give. You can place your own job in the right band from these; the firm date comes with the quotation.
- No tooling to wait for — the coiling line runs without tool dependency. On custom spring orders the longest wait is usually tooling preparation; that step does not exist here, and there is no tooling cost line either.
- Whether the wire is in stock — this is the decisive external factor. If the wire diameter and grade are held, production starts straight away; if not, wire procurement is added to the time.
- Where the dimensions come from — a sample in hand is the shortest route. Series production from a drawing adds an approval round; jobs that arrive as a dimension list sit between the two.
- Heat treatment — stress relieving after coiling is never skipped and is a fixed step. Shortening it means the spring loses its free length in the first cycles.
- End work and coating — end grinding and coating are separate steps. Galvanising is standard; painted or special colours are added to the time.
- Quantity — coiling time follows the quantity directly. Single pieces are made as well as series runs; the two do not carry the same lead time.
Material and coating
Spring steel is chosen according to where the product will work. Spring carbon steel for general machinery springs, stainless where corrosion is a risk, and heat treated spring wire for agricultural items carrying high fatigue loads. The reasoning behind steel selection is set out in a separate article in our technical guide.
Stress relieving after coiling is never skipped. A spring coiled without stress relief loses free length in its first cycles; in the field this is described as "the new spring settled straight away", and it is a quality defect.
On the coating side, galvanised finish is standard, and painted and coloured coatings are also produced. On an agricultural item, coating is not a visual preference: corrosion lowers spring force through loss of cross-section, so an uncoated field spring stops doing its job before it ever breaks.
Management system certificates
Production runs under eight separate management system certificates, chief among them quality (ISO 9001:2015), environment (ISO 14001:2015), occupational health and safety (ISO 45001:2018) and information security (ISO 27001:2022). All were issued by Ekol Belgelendirme Şirketi on 12 August 2026.
Their scope covers all production at the Biga plant — springs and spring leaves, coated or core wires, rods and wire form parts. Certificate numbers, validity dates and a verification link are on the certificates page, and all eight are downloadable as a single PDF.
One thing needs saying plainly: a management system certificate does not guarantee that a product will reach a particular performance figure. What it says is that a written order for how the work is done has been established and has passed an independent audit. For the technical properties of the product, look at the dimensions rather than the certificate.
Questions to ask a spring manufacturer
The most common problem with a spring order is a part that meets the dimensions but not the performance. The questions below exist to prevent that — a supplier without answers may hit the dimension and miss the service life.
- What is the wire diameter range? A narrow range means your requirement may keep landing at the limit. Ours is 0.20–40 mm.
- Is stress relieving carried out after coiling? If not, the spring loses free length in its first season. This is where a price difference is most often hidden.
- Is tooling required? If tooling is required, single parts and small batches are not economic. We have no tooling dependency.
- Do you produce from dimensions, or only from a sample? A supplier that accepts only samples is no help if you have no broken part in hand.
- What coating options are there? Galvanised finish is the minimum on a field spring; an uncoated quote looks cheaper and delivers a shorter life.
Categories by machine group
Each category page carries the item list for that group, compatible brands and group-specific questions.
Photographs from production
Frequently asked questions
Where do you manufacture?
In Biga, a district of Çanakkale in north-western Türkiye. Production began in 1978 and the present plant has been running since 1998. We ship throughout Türkiye.
What wire diameter range do you work in?
From 0.20 mm to 40 mm. That range covers everything from wire form parts to heavy duty springs on a cultivator leg.
Can I order a single spring?
Yes. Because the coiling line works without tooling dependency, single-part production is possible; there is no tooling cost line.
Can I order without sending a sample?
Yes. Wire diameter, outside diameter, free length and coil count are enough on compression and extension springs; leg length and leg angle as well on torsion and form springs. A photograph next to a ruler also works.
Do you make agricultural springs only?
Agricultural implements and machinery are our main line of work, but the coiling line does not discriminate; automotive, white goods and general machinery springs are produced as well.
Do you run series production from a technical drawing?
Yes. We produce to drawing for machinery manufacturers; you can attach the drawing to the quote form as a file.
Can I get help with spring calculation?
The calculator on this site takes your dimensions and works out spring rate, working length and, on compression springs, the safety factor, then draws a technical drawing sheet. You can attach a screenshot of that sheet to the quote form.
Do you manufacture springs to custom dimensions?
Yes — custom spring manufacturing is the bulk of the work. Because the coiling line runs without tooling dependency, a dimension that is not on the list can still be produced; a sample, a technical drawing or a list of dimensions is enough.
Do you manufacture stainless springs?
Yes. Stainless spring wire is used where the spring will work in an environment open to corrosion. Which material suits is decided by where the spring will work, and is settled together at the quotation stage.
Do you ship outside Biga?
Yes. Production is in Biga / Çanakkale and we ship throughout Türkiye by courier; international shipment is also possible. On custom work the city makes no difference — the process runs remotely from a sample, a drawing or dimensions.
How much does location matter when choosing a spring manufacturer?
Less than people assume. Spring manufacturing runs from a sample, a technical drawing or a list of dimensions; you do not need to be in the same city as the manufacturer to place an order. Location matters in only two cases: transport cost on very heavy, bulky items, and urgent work where a sample has to be handed over in person. Otherwise what decides is the wire diameter range, whether there is tooling dependency, and whether the line can run your quantity economically.
Related pages
Cannot find the spring you need?
We produce to your dimensions in the 0.20–40 mm wire range, with no tooling dependency. A sample, a technical drawing, or simply a photograph of the old spring is enough.
Fill in the quote formOr call us directly: 0850 840 54 17