BD Loops

BD Loops manufactures preformed vehicle detection loops for gate operators, parking systems, and access control. We stock 44 saw-cut sizes and 32 direct burial sizes, plus sealants, saw blades, and installation tools.

Shop Saw-Cut Loops (SC series)  |  Shop Direct Burial Loops (RL & EL series)  |  Sealants  |  Saw Blades

How to read a BD Loops part number — and every size we stock

Every BD Loops preformed loop part number works the same way: the letters give the loop style, the first number is the loop perimeter in feet, and the second is the lead-in length in feet. So SC 32-50 is a saw-cut loop with a 32 ft perimeter and a 50 ft lead-in run.

Prefix Style Use
SC Preformed saw-cut loop Existing concrete or asphalt — installed in a 3/16 in groove and sealed
RL Preformed direct burial loop New pours, asphalt paving, gravel, or under pavers — 40 ft lead-in
EL Preformed direct burial loop Identical to RL, used when the lead-in run is longer than 40 ft

Saw-cut part numbers — 44 sizes

SC 12-20, SC 12-50, SC 13-50, SC 14-20, SC 14-50, SC 16-20, SC 16-50, SC 18-20, SC 18-50, SC 20-20, SC 20-50, SC 24-20, SC 24-50, SC 24-100, SC 24-150, SC 24-200 TypeB, SC 28-50, SC 28-100, SC 32-20, SC 32-50, SC 32-100, SC 32-150, SC 32-200, SC 36-20, SC 36-50, SC 36-100, SC 36-150, SC 40-50, SC 40-100, SC 40-200, SC 44-20, SC 44-50, SC 44-100, SC 52-20, SC 52-50, SC 52-60, SC 52-100, SC 52-240, SC 60-20, SC 64-50, SC 69-20, SC 70-20, SC 73-20, SC 104-50. View the full saw-cut size chart.

Direct burial part numbers — 32 sizes

RL 12-40, EL 12-60, RL 14-40, EL 14-60, RL 16-40, EL 16-60, RL 18-40, EL 18-60, RL 20-40, EL 20-60, RL 24-40, EL 24-60, EL 24-100, EL 28-60, EL 28-100, EL 28-150, RL 30-40, RL 32-40, EL 32-60, EL 32-100, RL 36-40, EL 36-60, EL 36-100, EL 40-60, EL 40-100, RL 44-40, EL 44-60, EL 44-100, RL 52-40, EL 52-60, EL 52-100, RL 84-40. View the full direct burial size chart.

Common questions about BD Loops

What is the difference between RL and EL part numbers?

None in function — both are preformed direct burial loops. RL part numbers are used for loops with a 40 ft lead-in; EL part numbers are used when the lead-in run is longer than 40 ft.

Can I use a saw-cut loop for a direct burial application?

Both styles are rated for direct burial, but the direct burial loop has higher crush resistance and is the better choice for a bury. One exception: if you are installing under pavers on a concrete sub-base or slurry, use the saw-cut loop. Sandwiching wire between two hard surfaces will eventually fail.

What if my saw-cut pattern is not exact?

Any BD Loop can be made up to 4 ft smaller on site, either by trimming the dog-ear corners or by laying excess loop into the lead-in run. Cut slightly conservative and the loop will fit. You cannot make a preformed loop larger.

How many loops does my gate need?

A slide gate needs a minimum of two loops with an optional third. Single and double swing gates need a minimum of three with an optional fourth. Call us at (866) 965-5599 if you want help sizing a specific layout.

Do I need a loop detector as well?

Yes. A loop on its own does nothing — every loop circuit requires a detector to read it.

What sealant should I use?

BD-LS self-leveling sealant or BD-LG2 two-part polyurethane. Use a sealer, not a runny evaporation-cure crack filler.

About BD Loops products and applications

Direct Burial Loops

Designed for installation under concrete, asphalt, gravel, or pavers, direct burial loops are ideal for new construction projects. These loops are built with durable, solid-core wire and eliminate air gaps that can cause false detections.

Saw-Cut Loops

Perfect for retrofit installations, saw-cut loops are installed into a slot cut into existing concrete or asphalt and sealed for long-term durability. They feature protective outer jackets and pre-formed configurations for fast installation.

Loop Sealants & Accessories

Complete your installation with loop sealants, saw blades, and testing tools. Shop BD-LS self-leveling sealant, BD-LG2 two-part loop goop, the BD-LG2-GUN dispensing gun, and loop saw blades for asphalt, concrete, and both surfaces.

Common Loop Applications

  • Exit Loops: Automatically open gates when a vehicle approaches
  • Reverse Loops: Prevent gates from closing on vehicles
  • Shadow Loops: Protect swing gate paths from obstruction
  • Parking and traffic control, drive-thru, car wash, and perimeter access systems

Why Choose BD Loops?

  • Preformed loops for faster, cleaner installation
  • High-quality copper wire for improved detection accuracy
  • Designed to reduce false triggers and service calls
  • Wide range of sizes and configurations in stock
  • Made in the USA with proven reliability

Inductive loops detect metal objects such as cars and motorcycles, ensuring consistent performance without relying on pressure or magnetism. BD Loops products are trusted by gate installers and access control professionals for their durability, consistency, and ease of use.