Spring Solutions for the Defense and Military Industries

an amphibious vehicle

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Hunter Spring is a leading supplier of flat spring products, and is also an approved supplier of a wide variety of constant force spring and spring powered assemblies to the military and defense industries.

The company manufactures components for OEMs, prime contractors, and the Defense Supply Centers for the Department of Defense. Many of these parts are listed in the company’s NSN list.

Door and seat counterbalance springs, static grounding reels, and brush motor springs are the company’s most popular products for the defense and military industries. These products are often used for:

  • Aircraft refueling
  • Fuel transportation
  • Fuel dispensing
  • Deployable antennas
  • Deployable sensors
  • Retriever assemblies
  • Solar arrays
  • Altimeter tapes
  • Missiles

All of the products from Hunter Spring are manufactured in accordance to ISO 9001-2008. The company’s products comply with military specifications such as A-A-50696, A- A-59466, MIL-DTL-83413/7, MIL-DTL-83720, and MIL-DTL-83413/4.​

Prestressed Power Springs (SPIR'ATOR)

Hunter Spring produces its SPIR’ATOR prestressed power springs by reverse winding a NEG'ATOR spring on an arbor and enclosing it in a retaining ring or case.

Rotational energy can be acquired from either the case or arbor or, when linear motion is a requirement, through use of a pulley and cable attachment.

a spring

As torque and deflection are equal a SPIR'ATOR typically requires 20% less space than a conventional power spring, and also offers a flatter torque gradient.

Power springs are ideal for use in applications that require counterbalancing, winding, and retrieving.

Hunter Spring’s prestressed power springs are made from 301 High Yield Stainless Steel. Upon request, the company can also use other materials such as Inconel, Elgiloy, or high-carbon steel for custom applications. The springs are compact and lightweight, and thanks to the higher prestressing that permits the use of thinner material, the prestressed power springs come in smaller package sizes than traditional power springs.

Hunter Spring designs prestressed power springs for customer specific applications.

Download the Brochure for More Information

Spring Motor Assemblies (NEG'ATOR)

The NEG'ATOR spring motor assemblies from Hunter Spring are composed of single or double NEG'ATOR constant force springs mounted on either one or two storage drums and an output drum with an integral cable reel. The entire assembly is mounted on a metal base plate.

a spring motor

These complete assemblies can deliver either linear or rotary force and come ready to mount into user’s assembly or equipment.
Hunter Spring’s spring motor assemblies are made from 301 High Yield Stainless Steel. Upon request, the company can also use other materials such as Inconel, Elgiloy, or high-carbon steel for custom applications.

The spring motor provides constant force or torque and is designed for counterbalance applications such as aircraft baggage doors. tray tables, armrests and footrests.

Hunter Spring offers spring motor assemblies as custom design solutions. Customers can use the company’s design worksheet to specify their requirements and allow their Application Engineers to design a spring motor assembly that meets their specific needs.

Standard spring motor solutions are also available.

Download the Brochure for More Information

Static Grounding Reels

Hunter Spring has a long history of supplying static grounding reels to the military industry, where the reels are used when refueling tanks, trucks and aircraft, or for fuel transportation.

All static grounding reels supplied by Hunter Spring meet specifications such as A-A-50696 for critical applications where the discharge of static electricity can cause a spark and subsequent explosion.

Hunter Spring offers two types of static grounding reels; The Rota-Reel series and the ML series.

Rota-Reels are compact, lightweight grounding reels available in 20, 50, 75 and 100 feet lengths. Rota-Reels are the only fully enclosed reels on the market capable of reaching up to 75 and 100 feet.

The ML series features a prestressed power spring along with a patented latch mechanism that can lock the cable at any desired length. These heavy-duty reels also come standard with a retraction brake to limit the retraction speed of the cable between 2-7 ft/sec. The ML series static grounding reels are available in 50, 75 and 100 feet lengths.

Operating temperatures span from -54 °C to 52 °C.

Download the Brochure for More Information

This information has been sourced, reviewed and adapted from materials provided by Hunter Spring.

For more information on this source, please visit Hunter Spring.

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