Kumar Steels
An ISO 9001:2008 CERTIFIED

parabolic leaf springs manufacturers


U-Bolts and Center Bolts
With over four decades of experience in manufacturing suspensions Jonas has forayed into other products such as U-Bolts, Centre Bolts and Bushes. A U-Bolt is a metal fixing in the shape of the letter U, which has a pin or screw bolt closure which fits across the two ends making a closed clamp. We can provide you with any kind of U-bolt as per your drawings/specifications. The primary raw material used for manufacturing U-Bolts is EN 8 or as per your specification.
We can also provide you with Centre Bolts as per your specifications.

u bolts and center bolts
parabolic springs

Parabolic springs consists of one or two or more leaves. The leaves touch only in the middle, where they are fixed to the axle and at the outer ends, where they are fixed to the vehicle. In between those two points the leaves do not touch each other as they do with conventional leaf springs.Each leaf represents a complete spring in itself and will act as the same. To enable this, the leaf is tapered, from center to the outer end.parabolic spring This tapering is called parabolic and it means that every centimeter (or inch) the thickness of the leaf decreases in an amount that relates to the square function of it's length. .

The company produces the entire range of leaf spring assemblies ranging from light commercial vehicles to very heavy vehicles, for use in domestic as well as export markets. Kumar Springs also has the capability to manufacture a wide range of parabolic springs used for small trailers to large heavy duty vehicles. Kumar Springs uses a variety of material grades for the manufacture of springs. Some of the common grades used are BSS EN45A, EN 47,I.S. 65 SI 7, JU-SUP 9, SUP11A and DIN 50 CRV 4. Even the cross sections being manufactured are of a wide variety, ranging from 50 mm to 120 mm in width and from 6mm to 30 mm in thickness. Our company manufactures springs as per the design and specifications laid down by the vehicle manufacturers.

Multi leaf Spring
jack road

To meet the growing demands of clients, we manufacture and supply a wide range of Jack Rods, which is fabricated using high grade steel and raw material. Our Jack Rod which is designed and fabricated using premium quality raw material. The range is manufactured according to the specific requirements of clients and is extensively used for various industrial applications.

Product Specification

Material grades used

- EN45,EN45A,EN47,EN48, EN48A, SUP6, SUP7, SUP9, SUP11

Number of leafs in a spring

- 1 TO 22 LEAFS

Leaf span

- 200 TO 2400 mm

Width of the leaf

- 40 TO 120 mm

Leaf thickness

- 5 TO 30 mm

Sheared length

- 100 TO 2300 mm

Inside eye diameter

- 12 TO 60 mm

Taper length (conventional)

- MAX 235 mm


- MAX 250 mm

Bulldozing/scragging load

- MAX 40000 kgs (88200LBS)

Testing load

- MAX 20000 kgs (44100LB