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Flat Springs for Unique Applications 

flat springs

Flat springs are made of flat strip steel and are used in many applications and are ideally suited for applications where space is limited or where the spring can be used as part of mounting assembly. The flat spring design allows forming of specific features and profiles for a unique application and mounting location. Flat springs can be made in a variety of shape, sizes, designs and materials to work for many design applications. An experienced Lee Spring engineer knowledge in our fourslide, powerpress, and hand-forming tools can work with you from design concept through manufactured parts to assist with creating the optimal design of your custom flat spring.

Some common uses for flat springs include:

  • Electrical contacts
  • Leaf springs
  • Cantilever spring applications
  • Disc washers
  • Hold-downs
  • Clips
  • Shims
  • Plus many applications

Stock Flat Type Springs Available for Immediate Delivery

Lee Spring offers two types of stock flat springs, the standard Belleville disc flat spring and the flat wound Constant Force Spring. Stock Belleville disc springs are offered in 300 Series Stainless Steel and 51CrV4 spring steel (AISI 6150). The Lee Spring stock washer series are available in both imperial and metric sizes and fit common bolt sizes. The Lee Spring stock constant force springs are offered in 301 series Stainless Steel in imperial sizes. Search for a stock flat Disc Spring or flat wound Constant Force Spring which are both available for same day shipment.

flat spring belleville washer
Belleville Washer
flat spring constant force
Constant Force

Custom Flat Springs Made to Your Specification

Flat springs come in a variety of shapes, sizes and materials. Commonly used materials for flat springs include carbon steel, stainless steel, brass, copper, phosphor bronze, and beryllium copper. Lee Spring offers advanced capabilities and a wide variety of options for your flat spring manufacturing needs such as; advance quality control systems, regulatory expertise including RoHS, REACH and DFARS CAD assisted product design, in-house prototype production services and global supply chain network.

The size ranges that we can work with are:
      - Strip Width: up to 3” / 76.20 mm
      Strip Thickness: 0.003 to 0.125” / 0.08 mm – 3.18 mm

custom flat springs

Customer Support and Manufacturing Capabilities

  • CAD assisted Product Design (SolidWorks)
  • Short Run and Prototype Production
  • CAD assisted Tooling Design (CADKEY), including Progressive Dies
  • In-House Tooling Production, including Wire EDM
  • Automatic Stamping Presses up to 45 Tons
  • In-House Secondary Operations including CNC Machining, Vibratory Deburring, Painting, Welding & Assembly
  • Process Validation Procedures including 1st Articles and PPAP's
  • Extensive Network of Approved Suppliers (Raw Materials, Special Processes and Production Components)

Simply request a flat spring quote today or contact a Lee Spring Engineer for design assistance or to answer any questions to help start your custom flat spring project. Lee Spring is ISO 2015:9001 certified, REACH and RoHS compliant and ITAR Registered.

Why Choose Lee Spring?

large selection of springs

25,000+ products
available, plus custom
products made to your specification.



Springs Available Now

for immediate delivery

FREE Plating

on all Music Wire Stock Springs

FREE Grinding

on all Standard Stock Compression Springs

in stock springs

Springs ready to ship


In Stock

Expert Engineering Assistance

on Stock and Custom Springs

Certificate of Compliance

on all Stock Springs and Custom Springs

Guaranteed RoHS Compliance

on all Stock Springs

engineering and customer service support

Engineering and
Customer Service teams ready to



Live Customer Service Support

at all Locations

Enhanced CAD Downloads

on Stock Springs Designs

Global Flexibility

allows Lee Spring to find solutions that meet your
geographic requirements wherever your business
takes you in the world