Rocketry Works

Bonded Kevlar Shock Cord by the foot

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  • Bonded Kevlar (right grouping) ranges from 84 lb to 225 lb test
  • 84 lb Bonded Kevlar Shock Cord
  • 84 lb Tensile Strength Bonded Kevlar Shock Cord with scale
  • 135 lb Tensile Strength Bonded Kevlar Shock Cord with scale
  • 225 lb Tensile Strength Bonded Kevlar Shock Cord with scale


Kevlar shock cord is incredibly strong for its weight and is heat resistant, so it makes a great shock cord in model rockets. Bonded Kevlar cord is treated to resist fraying, and is a bit stiffer and more slippery than other string, which makes it easier to work with and helps deploy your recovery device nicely. Price is by the foot. Thicker cord is stronger, ranging from 84 lbs. tensile strength, which is great for low power rockets, to 225 lbs tensile strength, which is better for mid power rockets. 

A minimum of 3 feet of shock cord is best for small rockets; larger rockets likely need more to ensure proper deployment of the recovery device. Longer shock cords also provide more shock absorbancy, though Kevlar cord stretches much less than elastic shock cords.  Many times, this will help reduce damage to body tubes from the nose cone bouncing back and hitting the body tube, but the sharper yank at deployment requires a sturdy shock cord mount. Can be combined with elastic shock cord to add shock resistance in heavier models. Just put the Kevlar closer to the motor so you benefit from its flame resistance, and add a length of elastic shock cord near the recovery device.

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2 Reviews

  • 5
    Excellent Shock Cord

    Posted by Bill on 15th Jul 2021

    Love this shock cord (and the instructions to tie it into the engine mount). So far has held up very well. Lost a rocket due to the old-style shock cord failing so really like this product.

  • 5
    Quality parts

    Posted by Dan Wheelock on 6th Jan 2021

    Really helps with those Pro Series rockets....great price too.

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