Preformed 3/16″ Saw-Cut Loops





BD Loops Preformed Saw-Cut Inductance Loops are a complete loop with a set size loop and length of lead-in run. Our Saw-Cut Loops have an extra layer of protection: a durable outer jacket that protects and tightly binds the inner conductors. All BD Loops are made with 16 AWG copper wire and rated for direct burial use.


For saw-cut installations where a 3/16” or wider slot is cut into the concrete or asphalt and the loop wire is stuffed into the saw-cut slot and sealed with loop sealant.

Standard Loop Sizes

20′ of Lead-in

SC 14-202½’x 4½’ or 3’x 4’ loop with a 20’ lead-in.
SC 16-203’x 5’ or 4’x 4’ loop with a 20’ lead-in.
SC 18-203’x 6’ or 4’x 5’ loop with a 20’ lead-in.
SC 20-203’x 7’ or 4’x 6’ loop with a 20’ lead-in.
SC 24-204’x 8’ or 6’x 6’ loop with a 20’ lead-in.
SC 32-204’x 12’ or 6’x 10’ loop with a 20’ lead-in.
SC 36-206’x 12’ loop with a 20’ lead-in.
SC 44-206’x 16’ loop with a 20’ lead-in.
SC 52-206’x 20’ loop with a 20’ lead-in.

50′ Of Lead-in

SC 14-502½’x4½’ or 3’x4’ loop with a 50’ lead-in.
SC 16-503’x5’ or 4’x4’ loop with a 50’ lead-in.
SC 18-503’x6’ or 4’x5’ loop with a 50’ lead-in.
SC 20-503’x7’ or 4’x6’ loop with a 50’ lead-in.
SC 24-504’x8’ or 6’x6’ loop with a 50’ lead-in.
SC 28-504’x10’ or 6’x8’ loop with a 50’ lead-in.
SC 32-504’x12’ or 6’x10’ loop with a 50’ lead-in.
SC 36-506’x12’ loop with a 50’ lead-in.
SC 40-506’x14’ loop with a 50’ lead-in.
SC 44-506’x16’ loop with a 50’ lead-in.
SC 52-506’x20’ loop with a 50’ lead-in.

100′ Of Lead-in

SC 24-1004’x8’ or 6’x6’ loop with a 100’ lead-in.
SC 28-1004’x10’ or 6’x8’ loop with a 100’ lead-in.
SC 32-1004’x12’ or 6’x10’ loop with a 100’ lead-in.
SC 36-1006’x12’ loop with a 100’ lead-in.
SC 40-1006’x14’ loop with a 100’ lead-in.
SC 44-1006’x16’ loop with a 100’ lead-in.
SC 52-1006’x20’ loop with a 100’ lead-in.

Superior Features

· Extra layer of protection—Thick and durable outer jacket protects both loop and lead-in.

· Each loop is tested 3 ways before it leaves the factory.

· Backer-rod is built into the wire! No need to use backer-rod if the loop is installed in a 3/16” saw-cut groove.

· Lead-in wires are tightly bound in an protective outer
jacket. Eliminating the need for twisting.

· Both loop and lead-in fit into a 3/16” wide saw-cut groove. No more double cutting the lead-in run!

· Loop fills up a larger percentage of the saw-cut groove, requires less loop sealant to seal the groove. (30-40% less sealant vs a 1/4” wide groove)

· Cuts don’t need to be exact! Any BD Loop can be made up to 4’ smaller. Be slightly conservative with your cuts and BD Loops Preformed Saw-Cut Loops will fit every time.

· Use the BD-LS flat 3/16″ sealant tip and seal the loop in just 1 pass. No more waiting around for the sealant to seep in and top off gaps. Make an attractive smooth and even seal.


Not at all! As long as you don’t make the saw pattern larger than the loop size (you can never make a preformed loop any larger) our loop will fit every time. We designed our Saw-Cut loops to be able to take up excess loop in the lead-in run, which makes the loop smaller. 

This is accomplished by laying the loop parallel in the lead-in run up to 2ft (which shortens the overall perimeter of the loop by up to 4ft) Check out our in-depth article on methods to make preformed Saw-Cut Loops fit every time.

We recommend our BD-LS and BD-LG2 sealants but any loop sealant can be used. The main thing to keep in mind is you don’t want to use a runny evaporation cure material like crack filler. You want a SEALER not a FILLER.

There are various pros and cons to different loop sealants on the market. Learn more about the benefits of BD-LS here.

We recommend using our direct burial loops for direct burial applications. Both styles of loops are rated for direct burial, however the direct burial loop has higher crush resistance and is more suited for use in a direct bury application. If you find yourself in a pinch you can modify a saw-cut loop to provide more crush resistance – view how to modify the loop here.

Slide gate require 2 loop minimum with an optional 3rd. Example:

Single and double swing gates require 3 loops minimum with an optional 4th. Example:

If you need help determining the proper size contact BD Loops.

Cut Depth:
Saw-cut slots should be cut 1 1/4” – 1 1/2” deep.

Cut Width:
To prevent air pockets saw-cut slots should be at least 3/16” wide. Air pockets form when the saw cut slot is not wide enough for loop sealant to flow and fully encapsulate the loop wire. Using a 3/16” blade vs. a 1/4” blade will save you 25% in loop sealant.

Loops work by inductance and detect metal. Loop detectors require a percentage of change to trigger a detection, which means that enough metal needs to enter the detection field after the initial setup to trigger a detection.

In summary, loops detect moving metal objects such as vehicles.

Loops installed near electrical lines are unlikely to experience false detections or interference for most common applications.

Yes, BD Loops can make and ship custom sized loops and loops with custom lead-in lengths same day as long as we receive the order from a distributor by 12:00pm PST.

Yes, any excess lead-in may be cut off, but do not cut the lead-in too short because splicing on the lead-in wire creates a vulnerable point that can cause the loop to fail. Have the lead-in be longer than shorter.

Yes, for any loop circuit to function a loop detector is required. BD Loops will work with any brand of loop detector.

Yes, loops are the main means of detection for vehicles. Without the proper number of loops installed there will be instances where the gate can close on a vehicle.

Yes, but when running multiple loop lead-ins through the same conduit or trench there is the risk of cross talk between the different loop circuits. Loop detectors are equipped with a frequency setting to eliminate cross talk. Simply set each circuit on a different frequency which will maintain a 5kHz separation eliminating cross talk. Or keep the lead-ins 2″ away from each other to also eliminate the possibility of cross talk.