Leyland Suspension

Our sales team identify your specific requirements and select the appropriate specification sheet, of which over 6,000 are kept in our technical library. This is issued to the production team as a job card, specification job cards always contain a unique job reference number enabling total traceability throughout the entire working life of the spring.

Spring steel to BS970 is sheared to length and processed through the required manufacturing operations, including eye forming, nibbing, drilling, punching, taper rolling and wrapping. The leaves are then passed to heat treatment (1,000 - 1,050°C), shaped and oil quenched to give a quenching temperature of no less than 890°C. After draining, they are tempered at 500 - 560°C to give a Brinell hardness reading 356-440 HBS 10/3,000 to BS240 before final adjustment to give correct shape and camber.

On the final assembly line, the required components are added, i.e. bushes, clips, centre bolts, etc. to complete the spring, which is again checked against the specification sheet. The spring is treated with a protective coating and part number, and most importantly the job reference is attached. In accordance with our strict quality procedures, spring undergo final imspection before being despatched.

Locomotive springs follow a similar production route and inspection process, and are supplied with the relevant test certification.