In the year of 2008,Ningbo Yinzhou Very Metal Processing CO.,LIMITED begin to get in touch torsion bar for train. And one American customer want us to produce thistorsion bar.

Then we found torsion bar's quality requirment is very very high.

Belows is torsion bar's basic introduction from Wikipedia:
A torsion bar suspension, also known as a torsion spring suspension or torsion beam suspension, is a general term for any vehicle suspension that uses a torsion bar as its main weight bearing spring. One end of a long metal bar is attached firmly to the vehicle chassis; the opposite end terminates in a lever, the torsion key, mounted perpendicular to the bar, that is attached to a suspension arm, a spindle, or the axle. Vertical motion of the wheel causes the bar to twist around its axis and is resisted by the bar's torsionresistance. The effective spring rate of the bar is determined by its length, cross section, shape, material, and manufacturing process.

Torsion bar suspensions are used on combat vehicles or tanks like the T-72, Leopard 1, Leopard 2, M18 Hellcat, and Abrams (many tanks from late in World War II used this suspension), and on trucks and SUVs fromFord, Dodge, GM, Mitsubishi, Mazda, Nissan, Isuzu and Toyota. Manufacturers change the torsion bar or key to adjust the ride height, usually to compensate for heavier or lighter engines. While the ride height may be adjusted by turning the adjuster bolts on the stock torsion key, rotating the stock key too far can bend the adjusting bolt and (more importantly) place the shock piston outside its standard travel. Over-rotating the torsion bars can also cause the suspension to hit the bump-stop prematurely, causing a harsh ride. Aftermarket forged-metal torsion key kits use relocked adjuster keys to prevent over-rotation, and shock brackets to keep the piston travel in the stock range.

Then realize it and our technician analyse together for some days.
And our customer aslo support us.So we buy the equipments and start to produce.
After test and analyse, and got the confirmation from our customer.
last arrange the first mass production.And later,torsion bar is our main product.

Now Ferrabyrne Ltd,Kawasaki Heavy Industried,Ltd.in Japan are our main customers.