Hofmann Fluid Power Inc.

Serving the Fluid Power Industry Since 1950

Ring Lock Series

3/8″ and 1/2 ” Body Size
Maximum 300 PSI

Interchanges with Hansen 2RL and 3RL
Ring Lock Series (RL) couplers have a unique wire ring locking mechanism that locks or disconnects the plug to the coupler with a 1/4″ turn. The plugs are made of heat-treated and plated steel and the couplers are made of a combination of plated steel and brass. RL couplers are interchangeable with other industry ring lock couplers.


3/8″ Body Size
Sockets (Valved)

FNPT 3/8" Body Size Sockets (Valved)

 Part #Body SizeThread Size [A]Hex Size [B]O.A.L. [D]Max OD [E]Weight Lbs.
seriesrl-fnpt-38RLFB23/8"1/4"15/16"2.03"1.06".33
RLFB33/8"3/8"15/16"2.13"1.06".33
RLFB43/8"1/2"1"2.25"1.06".34

MNPT 3/8" Body Size Sockets (Valved)
 Part #Body SizeThread Size [A]Hex Size [B]O.A.L. [D]Max OD [E]Weight Lbs.
seriesrl-mnpt-38RLMB23/8"1/4"15/16"2.17"1.06".29
RLMB33/8"3/8"15/16"2.23"1.06".30
RLMB43/8"1/2"15/16"2.27"1.06".31

Hose Barb 3/8" Body Size Sockets (Valved)
 Part #Body SizeHose I.D. [A]Hex Size [B]O.A.L. [D]Max OD [E]Weight Lbs.
seriesrl-hb-38RLSB23/8"1/4"15/16"2.51"1.06".28
RLSB253/8"5/16"15/16"2.55"1.06".27
RLSB33/8"3/8"15/16"2.64"1.06".29
RLSB43/8"1/2"15/16"2.82"1.06".30

PL Hose Barb 3/8" Body Size Sockets (Valved)
 Part #Body SizeHose I.D. [A]Hex Size [B]O.A.L. [D]Max OD [E]Weight Lbs.
seriesrl-plhb-38RLSB3-PL3/8"3/8"15/16"2.52"1.06".28
RLSB4-PL3/8"1/2"15/16"2.62"1.06".29

3/8" Body Size
Plugs (Unvalved)

FNPT 3/8" Body Size Plugs (Unvalved)

 Part #Body SizeThread Size [A]Hex Size [B]O.A.L. [D]Max OD [E]Weight Lbs.
seriesrl-fnpt-38-plugRLFPB23/8"1/4"11/16"1.47".80".07
RLFPB33/8"3/8"13/16"1.54".94" .08
RLFPB43/8"1/2"1"1.68"1.16".13

MNPT 3/8" Body Size Plugs (Unvalved)
 Part #Body SizeThread Size [A]Hex Size [B]O.A.L. [D]Max OD [E]Weight Lbs.
seriesrl-mnpt-38-plugRLMPB13/8"1/8"1/2"1.55".58".05
RLMPB23/8"1/4"9/16"1.66".65".06
RLMPB33/8"3/8"11/16"1.73".80".09
RLMPB43/8"1/2"7/8"1.77"1.10".12

Hose Barb 3/8" Body Size Plugs (Unvalved)
 Part #Body SizeHose I.D. [A]O.A.L. [D]Max OD [E]Weight Lbs.
seriesrl-hb-38-plugRLSPB23/8"1/4"2.02"1/2".07
RLSPB33/8"3/8"2.09"5/8".15
RLSPB43/8"1/2"2.28"3/4".20

1/2" Body Size
Sockets (Valved)

FNPT 1/2" Body Size Sockets (Valved)

 Part #Body SizeThread Size [A]Hex Size [B]O.A.L. [D]Max OD [E]Weight Lbs.
seriesrl-fnpt-12RLFC21/2"1/4"1-1/16"2.24"1.25".47
RLFC31/2"3/8"1-1/16"2.28"1.25".46
RLFC41/2"1/2"1-1/16"2.43"1.25".46
RLFC51/2"3/4"1-1/16"2.56"1.25".50

MNPT 1/2" Body Size Sockets (Valved)
 Part #Body SizeThread Size [A]Hex Size [B]O.A.L. [D]Max OD [E]Weight Lbs.
seriesrl-mnpt-12RLMC21/2"1/4"1-1/16"2.28" 1.25".38
RLMC31/2"3/8"1-1/16"2.34"1.25".40
RLMC41/2"1/2"1-1/16"2.38"1.25".41
RLMC51/2"3/4"1-1/16"2.49"1.25".48

Hose Barb 1/2" Body Size Sockets (Valved)
 Part #Body SizeHose I.D. [A]Hex Size [B]O.A.L. [D]Max OD [E]Weight Lbs.
seriesrl-hb-12RLSC21/2"1/4"1-1/16"2.67"1.25".38
RLSC31/2"3/8"1-1/16"2.79"1.25".39
RLSC41/2"1/2"1-1/16"2.98"1.25".40
RLSC51/2"3/4"1-1/16"3.29"1.25".47

PL Hose Barb 1/2" Body Size Sockets (Valved)
 Part #Body SizeHose I.D. [A]Hex Size [B]O.A.L. [D]Max OD [E]Weight Lbs.
seriesrl-plhb-12RLSC4-PL1/2"1/2"1-1/16"2.79"1.25".40

1/2" Body Size
Plugs (Unvalved)

FNPT 1/2" Body Size Plugs (Unvalved)

 Part #Body SizeThread Size [A]Hex Size [B]O.A.L. [D]Max OD [E]Weight Lbs.
seriesrl-fnpt-12-plugRLFPC21/2"1/4"5/8"1.47".72".07
RLFPC31/2"3/8"1"1.74"1.16".07
RLFPC41/2"1/2"1"1.74"1.16".06

Attention: The internal data of table “MNPT24” is corrupted!

Hose Barb 1/2" Body Size Plugs (Unvalved)
 Part #Body SizeHose I.D. [A]O.A.L. [D]Max OD [E]Weight Lbs.
seriesrl-hb-12-plugRLSPC21/2"1/4"2.02"5/8".06
RLSPC31/2"3/8"2.14"11/16".08
RLSPC41/2"1/2"2.33"3/4".10
RLSPC51/2"3/4"2.66"1".18

Socket Construction


Plug Construction


Brass
Steel Zinc Plated

Pressure: 300 PSI
Seals: Buna
Steel
Zinc Plated

Pressure: 300 PSI
Seals: Buna