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Here’s a great image & chart (see above) from the 2014 A.L. Patterson Product Catalog that shows coil insert safe working load reduction factors for free edge conditions when tension loading. Free edge conditions refer to the inserts having a truncated shear cone on one side.

Below, the image & chart refers to coil insert safe working load reduction factors in thin wall conditions which refers to inserts having a truncated shear cone on two sides.

Coil-Inserts-swl-2-_-110613For both conditions, the minimum edge distance should equal 1.5 x the insert length while the minimum insert spacing should equal 3 x the insert length. Both charts are based on a 1/2″ recess from the face of the concrete.

Are you wondering how you should use the reduction factors? To calculate an insert’s reduced safe working load for free edge or thin wall conditions, multiply the insert’s safe working load (located in each insert’s load chart by the reduction multiplier in the above charts. Do not apply these reduction multipliers to other types or sizes of inserts.

Looking for more information on coil inserts or safety factors? Visit us on the web at www.patterson-online.com or give us a call: 1-800-332-7090.