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Common Manufacturing Specifications
While we have listed some of the most common sizes, materials and manufacturing specifications, Newcomb Spring provides completely customized production on all parts. If you don't see the part you need listed here, don't hesitate to contact us. Whatever your needs - Newcomb Kan-Do It!

Material Shapes & Specs

• .005 inches to .625 inches in diameter
• round wire
• square wire
• rectangular wire
• special section wire

End Types

• cross center hooks / cross loops
• draw bars
• extended machine hooks
• expanded hooks
• standard machine hooks
• rectangular ends
• reduced ends with swivel hooks
• teardrop-shaped ends
• threaded inserts
• v-hooks

Materials

• spring steel
• high carbon steel
• low carbon steel
• nickel plated carbon steel
• stainless alloys
• non-ferrous metals
• elgiloy
• hastelloy
• monel
• inconel
• titanium

With ISO 9001 certified quality systems, Newcomb Spring offers eight manufacturing plants and a special facility focused on the needs of our customers in Mexico and Latin America. We are ready to manufacture the precision extension springs that you need.

Manufacturing Specifications

Initial Tension
Most extension springs are wound with initial tension. This is an internal force that holds the coils together. The measure of the initial tension is the load necessary to overcome the internal force and begin coil separation. Unlike a compression spring that has zero load at zero deflection, an extension spring can have a preload at zero deflection (see graph). This built-in load, called initial tension, can be varied within limits, decreasing as the spring index increases.

Note that there is a range of stress (and, therefore, force) for any spring index that can be held without problems. If the designer needs an extension spring with no initial tension, the spring should be designed with space between the coils. Read more on initial tension.

Initial Tension (P₁) is determined by extending the spring to a given length (L₁) ensuring coil separation. The spring then is extended an equal distance to (L₂). The amount of initial tension is equal to two (2) times the load achieved at (L₁) minus the load at (L₂). The formula for Initial Tension Simplified
(P_i) = 2P₁ - P₂.

Extension Spring Ends
Newcomb Spring parts can be produced with a variety of ends types, all of which can vary in distance from the spring body. We match all end types to your exact order specifications, and can change end hook shapes based on customer needs. As one of the industry's leading extension spring manufacturers, we recommend discussing your requirements with a Newcomb sales engineer who can verify manufacturing capabilities and will work to keep your production costs as low as possible.

Extension Spring End Examples Rollover each end name for a sample part image.

Order Information
As with all Newcomb Spring-produced parts, we can custom manufacture any extension spring to fit your needs. As one of the leading manufacturers of extension springs in the United States, we have offered great prices, high quality and total customer satisfaction for over a century.

Contact us today, or request an extension spring manufacturing quote online and experience the Newcomb Spring difference for yourself.

Newcomb Spring is a founding member of the Spring Manufacturer's Institute. Some content here has been used with permission of the SMI.