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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
& Specifications

• .004 inches to 2.0 inches in diameter
• round wire
• square wire
• rectangular wire
• special section wire

Body Types

• open-coiled
• helical shaped
• usually coiled with a constant diameter, though they can be produced in hourglass, cone and barrel shapes

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 compression springs that you need.

Formulas & Compression Spring Manufacturing Specifications

Grinding
Compression spring ends often are ground to increase operational life and to allow the spring to sit squarely on the load-bearing surface. Grinding also increases the number of active coils and the wire diameter available in a given volume of space, which can result in higher loads or lower stresses. As a modern compression springs manufacturer, our facilities operate with a wide variety of equipment - from hand-operated grinding tools to automatic, high-speed vertical spindle disc grinders.

Design
Many issues related to the design of compression springs should be considered, as these relate directly to the spring's performance. Manufacturing tolerance requirements, squareness of ends, deflection and the slenderness ratio often are overlooked in the design process. Newcomb's sales and engineering staff will gladly review your compression spring specifications. We can offer design assistance and recommend the best options to control costs and make sure the spring functions to fit your needs.

Compression Spring Formulas for Dimensional Characteristics When applying the given data to solid height, one should remember that the formulas do not consider the fact that the actual solid height may not be the same as calculated, due to improper seating of the coils, variation in the grinding process, normal variation in wire size and electroplating.

Spring Characteristic	Open	Open & Ground	Closed	Closed & Ground
Pitch (p)	L - d na	L na	L - 3d na	L - 2d na
Solid Height (H)	d(Nt + 1)	d x Nt	d(Nt + 1)	d x Nt
Total Coils (Nt)	na	na + 1	na + 2	na + 2
Free Length (L)	(p x na) + d	p x na	(p x na) + 3d	(p x na) + 2d

d = Diameter of Round Wire (in. or mm.) L = Free Length Nt = Number of Coils

na = Number of Active Coils p = Pitch

Compression Spring End Types & Direction of the Wind

Closed Ends, Not Ground, Left-Hand Helix	Closed & Ground Ends, Right-Hand Helix
Open Ends, Not Ground, Right-Hand Helix	Open & Ground Ends, Left-Hand Helix

Mean Coil Diameter
To calculate mean coil diameter (D) subtract a spring's wire diameter (d) from its outside diameter (O.D.).

Order Information
As with all Newcomb Spring-produced parts, we can custom manufacture any compression spring to fit your needs. As a trusted compression spring manufacturer, we have offered great prices, high quality and total customer satisfaction for more than a century.

To experience the Newcomb Spring difference for yourself, contact us today, or request a compression spring manufacturing quote online.

As a leading compression springs manufacturer, Newcomb Spring is a founding member of the Spring Manufacturer's Institute. Some content here has been used with permission of the SMI.