3/8" Drive crowsfoot FRX FCO catalog drawings

Left is the 1948 FRX series. Right is the 1953 FCO series

3/8” drive Crows foot 

The first series listed is the 1948 FRX series. This series is for flare nuts used in tubing. The tubing types listed was “duralumin, aluminum, copper and brass” tube nuts. These were found is aviation and transmissions. I think they actually started much earlier and were used for WWII plane maintenance

The second series listed is the 1953 FCO series; it is not a flare nut series and can be slipped on the nut from the side. Still listed for pipe and tube fittings

Sockets

Sizes 

Date 

FRX-20

5/8

1948

FRX-22

11/16

1948

FRX-24

¾

1948

FRX-26

13/16

1948

FRX-28

7/8

1948

FRX-30

15/16

1948

FRX-32

1

1948

FRX-34

1 1/16

1948

Sockets

Sizes 

Date

FCO-12

3/8

1960-1995

FCO-14

7/16

1953-1995

FCO-16

½

1953-1995

FCO-18

9/16

1953-1995

FCO-20

5/8

1953-1995

FCO-22

11/16

1953-1995

FCO-24

¾

1953-1995

FCO-26

13/16

1955-1995

FCO-28

7/8

1955-1995

FCO-30

15/16

1978-1995

FCO-32

1

1978-1995

3/8” FRX and FRH crowsfoot series

Left 1962 FRX series Right the 1967 FRH series Below is the actual FRH

The 1962 FRX series is a flare nut wrench for soft metal fittings on oil lines specifically for automatic transmission lines. 

In 1967 the FRH series was introduced in 1967. This is listed for soft metal nuts on fuel and transmission lines, aircraft hydraulic systems and other aerospace applications

3/8" Drive 1962 FRX FRH catalog drawing plus photo

3/8” Drive
Crows Foot Sockets 

Sizes 

Date Range

FRX-140

7/16

1962-1965

FRX-160

½

1962-1965

FRX-180

9/16

1962-1965

FRX-200

5/8

1962-1965

FRX-220

11/16

1962-1965

FRX-240

¾

1962-1965

 

3/8” Drive
Crows Foot Sockets 

Sizes 

Date range

FRH-120S

3/8

1967-1995

FRH-140S

7/16

1967-1995

FRH-160S

½

1967-1995

FRH-180S

9/16

1967-1995

FRH-200S

5/8

1967-1995

FRH-220S

11/16

1967-1995

FRH-240S

¾

1967-1995

FRH-260S

13/16

1978-1995

FRH-280S

7/8

1978-1995

FRH-300S

15/16

1995

FRH-320S

1

1995

 

3/8” Newer crowsfoot wrenches

Crows foot 

Size

Date Range 

AN-8506-1

7/16

1978

AN-8506-2s

½

1978

AN-8506-3

9/16

1978

AN-8506-4

19/32

1978

AN-8506-5

5/8

1978

AN-8506-6

¾

1978

AN-8506-7

13/16

1978

AN-8506-8

7/8

1978

AN-8506-9

15/16

1978

AN-8506-10

1

1978

AN-8506-11

1 and 1/16

1978

AN-8506-12

1 and 1/8

1978

AN-8506-13

1 and 3/16

1978

AN-8506-14

1 and ¼

1978

AN-8506-15

1 and 5/16

1978

AN-8506-16

1 and 3/8

1978

AN-8506-17

1 and 7/16

1978

AN-8506-18

1 and ½

1978

AN-8506-19

1 and 9/16

1978

AN-8506-20

1 and 5/8

1978

AN-8506-21

1 and 11/16

1978

AN-8506-22

1 and ¾

1978

AN-8506-23

1 and 13/16

1978

AN-8506-24

1 and 7/8

1978

AN-8506-25

1 and 15/16

1978

AN-8506-26

2 inch

1978

AN-8506-27

2 and 1/16

1978

AN-8506-28

2 and 1/8

1978

AN-8506-29

2 and 3/16

1978

AN-8506-30

2 and ¼

1978

AN-8506-31

2 and 5/16

1978

AN-8506-32

2 and 3/8

1978

AN-8506-33

2 and 7/16

1978

AN-8506-34

2 and ½

1978

AN-8506-35

2 and 9/16

1978

AN-8506-36

2 and 5/8

1978

AN-8506-37

2 and 11/16

1978

AN-8506-38

2 and ¾

1978

AN-8506-39

2 and 13/16

1978

AN-8506-40

2 and 7/8

1978

AN-8506-41

2 and 15/16

1978

AN-8506-42

3 inch

1978

AN-8506-10A

1

1995

AN-8506-11A

1 and 1/16

1995

AN-8506-12A

1 and 1/8

1995

AN-8506-13A

1 and 3/16

1995

AN-8506-14A

1 and ¼

1995

AN-8506-15A

1 and 5/16

1995

AN-8506-16A

1 and 3/8

1995

AN-8506-17A

1 and 7/16

1995

 

 

 

 

 

 

 

 

 

Crows foot 

Size

Date Range 

FC14A

7/16

1995

FC16A

½

1995

FC18A

9/16

1995

FC20A

5/8

1995

FC22A

11/16

1995

FC24A

¾

1995

FC26A

13/16

1995

FC28A

7/8

1995

FC30A

15/16

1995

FC32A

1

1995

FC34A

1 and 1/16

1995

FC36A

1 and 1/8

1995

FC38A

1 and 3/16

1995

FC40A

1 and ¼

1995

FC42A

1 and 5/16

1995

FC44A

1 and 3/8

1995

FC46A

1 and 7/16

1995

FC48A

1 and ½

1995

FC50A

1 and 9/16

1995

FC52A

1 and 5/8

1995

FC54A

1 and 11/16

1995

FC56A

1 and ¾

1995

FC58A

1 and 13/16

1995

FC60A

1 and 7/8

1995

FC62A

1 and 15/16

1995

FC64A

2 inch

1995

FC66A

2 and 1/16

1995

FC68A

2 and 1/8

1995

FC70A

2 and 3/16

1995

FC72A

2 and ¼

1995

FC74A

2 and 5/16

1995

FC76A

2 and 3/8

1995

FC78A

2 and 7/16

1995

FC80A

2 and ½

1995

FC82A

2 and 9/16

1995

FC84A

2 and 5/8

1995

FC86A

2 and 11/16

1995

FC88A

2 and ¾

1995

FC90A

2 and 13/16

1995

FC92A

2 and 7/8

1995

FC94A

2 and 15/16

1995

FC96A

3 inch

1995

Used for aviation plumbing

3/8” Drive
Crows Foot Sockets 

Sizes 

Date Range

FRX-121

7/16

1995

FRX-141

7/16

1995

FRX-161

½

1995

FRX-181

9/16

1995

FRX-201

5/8

1995

FRX-221

11/16

1995

FRX-241

¾

1995