Coil Insert Safety Information and Bolt Selection
SPT - Swivel Lift Plate Thickness + + RH - Recess Depth CTH - Coil Thread Length (A) 1.5 x Diameter of Insert* Recommended Minimum Bolt Length = SPT - Swivel Lift Plate Thickness + + RH - Recess Depth Maximum Bolt Length = + VH - Void Length
Recommended Minimum Bolt Length Maximum Bolt Length
Bolt does not thread through the insert. Insert will pull apart and "pig tail" Bolt bottoms-out in the concrete Wrench Over tightening a bolt can shear the welds on the insert, causing the insert to fail.
Bolt too short or worn
When bolts are too short they will only engage part of the Coil threads, often leading to "pig tailing". Worn bolts typically wear down in a tapered orientation and can also cause the insert to "pig tail".
Bolt too long
2 Strut Inserts are not typically recommended for lifting & handling (tension only) 4 Strut Insert for lifting & handling
Note: When using Coil Inserts for lifting and handling only 4 Strut Inserts should be used in 3/4" or larger diameters. The below images show 2 Strut Inserts for illustration purposes only. Although 2 Strut Inserts can be used, they require straight tension loading, no angled loading. Coil bolts, nuts, rods and inserts should not be mixed from different suppliers as there is no industry standard for coil threads. Coil thread manufactured per ALP specification. *1.5 x bolt diameter is recommended to compensate for worn threads at the end of bolt. *0.5 x bolt diameter may be used for new bolts or bolts that have been verified to have proper thread height. 800.332.7090 firstname.lastname@example.org alpsupply.com 02/2022 89
COIL INSERTSPrevious Page