For pricing info and quotes:
Toll Free: 800-225-2952  ⚫   E-Mail
Special discounts on pipe plugs are available.

Deflection Gauges & Kits:


Deflection gauges aka "mandrels", are used to test flexible sewer pipes for out-of-roundness aka "deflection". This testing ensures that flexible pipe has been properly bedded and back-filled to give optimum performance per ASTM Designation D2321-89.


Cherne Steel Gauges are designed to allow gravel and debris to pass through easily. Other kinds of gauges have a tendency to get hung up on rocks and obstructions causing a deflection test to fail even though the pipe is within deflection tolerances creating a great expense for the contractor.

- Durable steel construction for municipalities that require mandrels to be constructed of steel
- Zinc plated which resists rust and corrosion
- Conforms to mandrel sizing specification: blade length is equal to or greater than the   nominal pipe size to conform with mandrel sizing specifications
- Nine-arm design ensures testing accuracy
- Open design allows gravel and debris pass-through

- 5% Deflection Gauges for SDR-35 Pipe per ASTM D3034 (4"-15" Dia.)
- 5% Deflection Gauges for SDR-26 Pipe per ASTM D3034 (4" -15" Dia.)
- 7.5% Deflection Gauges for SDR-35 Pipe per ASTM D3034 (4" - 15" Dia.)
- 7.5% Deflection Gauges for SDR-26 Pipe per ASTM D3034 (4" -15" Dia.)

- 5% Deflection Gauges for PS 46 (SDR-35) Pipe per ASTM F679 (18" - 48" Dia.)
- 5% Deflection Gauges for PS 115 (SDR-26) Pipe per ASTM F679 (18" - 48" Dia.)
- 7.5% Deflection Gauges for PS 115 (SDR-26) Pipe per ASTM F679 (18" - 48" Dia.)
- 7.5% Deflection Gauges for PS 46 (SDR-35) Pipe per ASTM F679 (18" - 48" Dia.)


Product Specifications

Adjustable Aluminum Deflection Gauges utilize a 9 arm design to ensure the pipe is tested accurately. Sized to within .01" to meet ASTM requirements. Constructed of lightweight aluminum, gauges will not rust and are up to 75% lighter in comparison to steel models. Economical and versatile patented design, features interchangeable fins for different pipe sizes. Cherne's unique fin design allows for accurate field size verification using a tape measurer or yardstick:

- Simply put two fins end to end and meaure the width.
- Add one inch to that dimension and you have the outside diameter of the deflection gauge
- Fins for gauge sizes 4-15" have a skid size equal to the nominal pipe size, ensuring the   gauge meets regional codes. This also guarantees that the gauge will not tip in the line.
- Fin design assembles easily without tools and all sizes fit through a standard 24" manhole.

Cherne's fin style deflection gauges are designed to be field verified by inspectors without the need for a proving ring:

- Simply place two fins end to end and measure the width
- add one inch for the mandrel and you have the outside dimension of the gauge. Using this   method simplifies the inspector's job of verifying sizing on deflection gauges.

Product Specifications


Aluminum Fin Sets:

- Lightweight, corrosion-resistant
- Field-verifiable without a proving ring
- Assembles without tools
- All sizes fit through standard 24" manhole
- Fins for 4"-15" gauges have skid size equal to th nominal pipe size-gauge will meet regional   codes and will not tip in the line
- Nine-fin design ensures testing accuracy
- Open design allows gravel and debris pass-through


- 5% Aluminum Fin Sets for SDR-26 Pipe per ASTM D3034 (4" - 15" Dia.)
- 5% Aluminum Fin Sets for SDR-35 Pipe per ASTM D3034 (4" - 15" Dia.)
- 5% Aluminum Fin Sets for PS 115 (SDR-26) Pipe per ASTM F679 (18" - 48" Dia.)
- 5% Aluminum Fin Sets for PS 46 (SDR-35) Pipe per ASTM F679 (18" - 48" Dia.)

- 7.5% Aluminum Fin Sets for SDR-26 Pipe per ASTM D3034 (4" - 15" Dia.)
- 7.5% Aluminum Fin Sets for SDR-35 Pipe per ASTM D3034 (4" - 15" Dia.)
- 7.5% Aluminum Fin Sets for PS 115 (SDR-26) Pipe per ASTM F679 (18" - 48" Dia.)
- 7.5% Aluminum Fin Sets for PS 46 (SDR-35) Pipe per ASTM F679 (18" - 48" Dia.)


Product Specifications




Deflection Kits:

- Lightweight, corrosion-resistant
- Field-verifiable without a proving ring
- Assembles without tools
- All sizes fit through standard 24" manhole
- Fins for 4"-15" gauges have skid size equal to th nominal pipe size-gauge will meet regional   codes and will not tip in the line
- Nine-fin design ensures testing accuracy
- Open design allows gravel and debris pass-through

5% Kits for SDR 26 Pipe per ASTM D3034:
- Nominal pipe sizes: 6" / 8" / 12"
- Nominal pipe sizes: 8" / 10" / 12"

5% Kits for SDR 35 Pipe per ASTM D3034:
- Nominal pipe sizes: 6" / 8" / 12"
- Nominal pipe sizes: 8" / 10" / 12"

7.5% Kits for SDR 35 Pipe per ASTM D3034:
- Nominal pipe sizes: 6" / 8" / 12"
- Nominal pipe sizes: 8" / 10" / 12"

Product Specifications







Cherne® Proving Rings: Used to verify deflection gauge sizes and are available in standard and custom sizes.

- Standard sizes: 6"-15" SDR 35 5% deflection and 8"-12" SDR 35 7.5% deflection
- Custom sizes for 5"-18" also available

Product Specifications