Frangible Couplings & Floor Flanges

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Frangible Couplings & Floor Flanges

Frangible couplings are designed to break away cleanly upon impact, minimizing damage to an aircraft during an accident. Common applications include support for runway/taxiway lights, heliport flood lights, and masts. Please review your product manual to ensure you order the correct coupling. To avoid premature or catastrophic failure, frangible couplings should only be used for approved applications.

Choose between Couplings for 1" Diameter Risers, Couplings for 2" Diameter Risers, and Floor Flanges.

1" Diameter Risers

FL-FC1.5 frangible coupling

Frangible Coupling for Mounting 1" Diameter Riser to 1935 Baseplate (1-1/2" Thread)

For L-860/L-861/L-862 runway/taxiway edge and heliport flood lights.

Part Numbers: FL-FC1.5-Y: Yellow Powder Coat
FL-FC1.5-R: Red Powder Coat
FL-FC1.5-MT: Marine Treated
Height: 2.6"
Top Dimensions: 1.62" OD, 1.22" ID
Bottom Dimensions: 1.38" OD, 1.03" ID
Upper Flange Bolt: 1 bolt included: hex head, 1/4-20 x 3/4", stainless steel
Thread: 1"-1/2-12 UNF-2A
Material: Aluminum
FL-FC2.0 frangible coupling

Frangible Reducer Coupling for Mounting 1" Diameter Riser to 1932 Baseplate (2" Thread)

For L-860/L-861/L-862 runway/taxiway edge and heliport flood lights.

Part Numbers: FL-FC2.0-Y: Yellow Powder Coat
FL-FC2.0-R: Red Powder Coat
FL-FC2.0-MT: Marine Treated
Height: 2.97"
Top Dimensions: 1.56" OD, 1.19" ID
Bottom Dimensions: 2.31" OD, 1.81" ID
Upper Flange Bolt: 1 bolt included: hex head, 1/4-20 x 3/4", stainless steel
Thread: 2" NPT
Material: Aluminum

2" Diameter Risers

66-961 frangible coupling

Frangible Coupling for Mounting 2" Diameter Riser to 1932 Baseplate (2" Thread)

For military fixtures.

Part Numbers: 66-961: Anodized
66-961-Y: Yellow Powder Coat
66-961-O: Orange Powder Coat
Height: 3.69"
Top Dimensions: 2.4" OD, 2.2" ID
Bottom Dimensions: 2.35" OD, 1.85" ID
Thread: 2"-11-1/2 NPSL
Material: Aluminum
66-961B frangible coupling

2" Frangible Coupling (Thread Both Ends)

For fencing or approach systems where the control panel mounts on rigid pipe instead of EMT.

Part Numbers: 66-961B: Anodized
Height: 3.83"
Top Dimensions: 2.35" OD, 1.8" ID
Bottom Dimensions: 2.35" OD, 1.75" ID
Thread: 2"-11-1/2 NPSM both ends
Material: Aluminum
75-59E 66-961AT couplings

Frangible Coupling for 2" NPT EMT

#75-59E: for L-862 runway edge lights and approach lights: PAPI (Airport Lighting Co. only), REIL, MALSR. #66-961AT: for base plates and floor flanges.

Part Numbers: 75-59E: Anodized
Height: 5.7"
Top Dimensions: 2.7" OD, 2.2" ID
Bottom Dimensions: 2.35" OD, 1.8" ID
Thread: 2"-11-1/2 NPT
Material: Aluminum
Part Numbers: 66-961AT: Anodized
Height: 5.3"
Top Dimensions: 3" OD, 2.5" ID
Bottom Dimensions: 2.35" OD, 1.8" ID
Thread: 2"-11-1/2 NPT (Chamfers reduce thread count. Chamfers assist easy engagement of base plate threads.)
Material: Aluminum
D-LUX I-LUX frangible coupling

D-Lux, I-Lux Sign Couplings

Used for mounting D-Lux, I-Lux taxiway and runway signs.

D-Lux Part Numbers: 32-D6-DC1: Size 1 D-Lux sign
32-D6-DC2: Size 2 D-Lux sign
32-D6-DC3: Size 3 D-Lux sign
Height: 6"
Dimensions: 2.37" OD, 2.07" ID
Thread: 2" NPT
Material: Aluminum
I-Lux Part Numbers: 32-I6-FC1: Size 1 I-Lux sign
32-I6-FC2: Size 2 I-Lux sign
32-I6-FC3: Size 3 I-Lux sign
32-I6-FC4: Size 4 I-Lux sign
Height: 6"
Dimensions: 2.37" OD, 2.07" ID
Thread: 2" NPT
Material: Aluminum
77-REG616 frangible coupling

2" Double Compression Type EMT Coupling

Used to join Electrical Metallic Tubing (EMT) to a box or to couple two ends of EMT conduit.

Part Numbers: 77-REG616
Height: 3"
Dimensions: 2.74" OD, 2.18" ID
Material: Zinc Die-Cast

Floor Flanges

15-FFF2X425 frangible coupling

PAPI Frangible Floor Flange

Used for mounting Flight Light Inc. PAPI light housing assemblies. Designed to receive 2" Electrical Metallic Tubing (EMT).

Part Numbers: 15-FFF2X425
Height: 2.94"
Top Dimensions: 2.58" OD, 2.19" ID
Bottom Dimensions: 4.12" x 4.12"
Bolt Circle: 4.25"
Upper Flange Bolts: 3 bolts included: hex head, 1/4-20 x 1.0", stainless steel
Bottom Flange Bolts: 4 bolts not included: flat head, 3/8-16 x required depth
Material: Aluminum
HA-B1A0009SDE frangible coupling

6" Rigid Floor Flange (2" Thread)

Used for mounting wind cones, obstruction lights, approach lights and helipad elevated lights.

Part Numbers: HA-B1A0009SDE2: Anodized
HA-B1A0009SDE3: Orange
HA-B1A0009SDE5: Yellow
HA-B1A0009SDE6: Marine Treated
HA-B1A0009SDE7: Red
Height: 1.25"
Top Dimensions: 3" OD, 2.26" ID
Bottom Dimensions: 6" OD
Bolt Circle: 4.75"
Bottom Flange Bolts: 4 bolts not included: flat head, 1/2 or 3/8-16 x required depth.
Thread: 2" NPS
Material: Aluminum

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