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 | 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 | 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 |
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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 | 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 |