Hofmann Fluid Power Inc.

Serving the Fluid Power Industry Since 1950

Straight Thru Interchange

1/8″ – 1″ Body Size

Series F couplers are only offered with a straight thru design and are primarily used in the pressure washer industry, but they have been manufactured for other applications such as paintball guns and fuel system maintenance. They come in brass and 303 stainless steel and can be ordered with buna, EP, or viton seals and can be equipped with sleeve locks for safety. Available with male NPT, female NPT and hose barb for low-pressure applications. These couplers are fully interchangeable with other ST Series couplers.


Click on any of the part numbers to request a quote.

Sockets

 Part #Body
Size
Thread
Size [A]
O.A.L
[B]
Max O.D.
[C]
Hex
[D]
Working PressureBurst
Pressure
Flow RateWeight
Lbs.
seriesf-socket11FB1/8"1/8"-27 NPTF1.01".65"9/16"2,80011,8003 GPM0.06
2FB1/4"1/4"-18 NPTF1.40".96"13/16"3,80015,3006 GPM0.15
3FB3/8"3/8"-18 NPTF1.60"1.13"1"3,00014,10014 GPM0.24
4FB1/2"1/2"-14 NPTF1.96"1.27"1-1/8"2,4009,70024 GPM0.37
6FB3/4"3/4"-14 NPTF2.10"1.65"1-1/2"2,0008,70058 GPM0.57
8FB1"1" 11-1/2 NPTF2.36"2.02"1-3/4"1,6006,700100 GPM0.93
10FB1-1/4"1-1/4" 11-1/2 NPTF2.36"2.59"2-1/4"1,8007,500150 GPM1.38
12FB1-1/2"1-1/2" 11-1/2 NPTF2.89"3.18"2-3/4"1,8007,500250 GPM1.42
16FB2"2" 11-1/2 NPFT3.00"4.04"3-1/2"1,8007,500350 GPM4.72

 Part #Body
Size
Thread
Size [A]
O.A.L
[B]
Max O.D.
[C]
Hex
[D]
Working PressureBurst
Pressure
Flow RateWeight
Lbs.
seriesf-socket21FMB1/8"1/8"-27 NPTF1.01".65"9/16"2,80011,8003 GPM0.06
2FMB1/4"1/4"-18 NPTF1.66".96"13/16"3,80015,3006 GPM0.15
3FMB3/8"3/8"-18 NPTF1.70"1.13"1"3,00014,10014 GPM0.24
4FMB1/2"1/2"-14 NPTF2.00"1.27"1-1/8"2,4009,70024 GPM0.37
6FMB3/4"3/4"-14 NPTF2.24"1.65"1-1/2"2,0008,70058 GPM0.57
8FMB1"1" 11-1/2 NPTF2.61"2.02"1-3/4"1,6006,700100 GPM0.93

 Part #Body
Size
Thread
Size [A]
O.A.L
[B]
Max O.D.
[C]
Hex
[D]
Working PressureBurst
Pressure
Flow RateWeight
Lbs.
seriesf-socket31FPB1/8"1/8"-27 NPTF.98".65"9/16"2,80011,8003 GPM0.03
2FPB1/4"1/4"-18 NPTF1.47".79"11/16"3,80015,3006 GPM0.07
3FPB3/8"3/8"-18 NPTF1.60"1.01"7/8"3,00014,10014 GPM0.12
4FPB1/2"1/2"-14 NPTF1.82"1.16"1"2,4009,70024 GPM0.23
6FPB3/4"3/4"-14 NPTF2.05"1.37"1-3/16"2,0008,70058 GPM0.32
8FPB1"1" 11-1/2 NPTF2.36"1.73"1-1/2"1,6006,700100 GPM0.52
10FPB1-1/4"1-1/4" 11-1/2 NPTF2.47"2.31"2"1,8007,500150 GPM0.85
12FPB1-1/2"1-1/2" 11-1/2 NPTF2.74"2.60"2-1/4"1,8007,500250 GPM1.45
16FPB2"2" 11-1/2 NPFT3.00"3.03"2-5/8"1,8007,500350 GPM1.9

 Part #Body
Size
Thread
Size [A]
O.A.L
[B]
Max O.D.
[C]
Hex
[D]
Working PressureBurst
Pressure
Flow RateWeight
Lbs.
seriesf-socket41FPMB1/8"1/8"-27 NPTF1.15".58"1/2"2,80011,8003 GPM0.02
2FPMB1/4"1/4"-18 NPTF1.50".65"9/16"3,80015,3006 GPM0.05
3FPMB3/8"3/8"-18 NPTF1.69".79"11/16"3,00014,10014 GPM0.08
4FPMB1/2"1/2"-14 NPTF1.91"1.01"7/8"2,4009,70024 GPM0.13
6FPMB3/4"3/4"-14 NPTF2.25"1.23"1-1/16"2,0008,70058 GPM0.22
8FPMB1"1" 11-1/2 NPTF2.45"1.59"1-3/8"1,6006,700100 GPM0.43
10FPMB1-1/4"1-1/4"-11-1/2" NPTF2.80"2.02"1-3/4"1,8007,500150 GPM0.96
12FPMB1-1/2"1-1/2"-11-1/2" NPTF3.38"2.60"2-1.4"1,8007,500250 GPM1.46
16FPMB2"1"-11-1/2 NPTF3.58"3.03"2-5/8"1,8007,500350 GPM1.5

 Part #Body SizeThread Size [A]O.A.L [B]Max O.D. [C]Hex [D]Working PressureBurst PressureFlow RateWeight Lbs.
1F-SS1/8"1/8"-27 NPTF1.01".65"9/16"5,00029,9003 GPM0.06
2F-SS1/4"1/4"-18 NPTF1.40".96"13/16"7,50033,8006 GPM0.15
3F-SS3/8"3/8"-18 NPTF1.60"1.13"1"7,50034,40014 GPM0.24
4F-SS1/2"1/2"-14 NPTF1.96"1.27"1-1/8"3,50014,00024 GPM0.37
6F-SS3/4"3/4"-14 NPTF2.10"1.65"1-1/2"3,00019,40058 GPM0.57
8F-SS1"1" 11-1/2 NPTF2.36"2.02"1-3/4"2,0009,100100 GPM0.93
10F-SS1-1/4"1-1/4" 11-1/2 NPTF2.36"2.59"2-1/4"2,00010,000150 GPM1.38
12F-SS1-1/2"1-1/2" 11-1/2 NPTF2.89"3.18"2-3/4"2,00012,000250 GPM1.42
16F-SS2"2" 11-1/2 NPFT3.00"4.04"3-1/2"2,0009,000350 GPM4.72

 Part #Body SizeThread Size [A]O.A.L [B]Max O.D. [C]Hex [D]Working PressureBurst PressureFlow RateWeight Lbs.
1FM-SS1/8"1/8"-27 NPTF1.01".65"9/16"5,00029,9003 GPM0.06
2FM-SS1/4"1/4"-18 NPTF1.66".96"13/16"7,50033,8006 GPM0.15
3FM-SS3/8"3/8"-18 NPTF1.70"1.13"1"7,50034,40014 GPM0.24
4FM-SS1/2"1/2"-14 NPTF2.00"1.27"1-1/8"3,50014,00024 GPM0.37
6FM-SS3/4"3/4"-14 NPTF2.24"1.65"1-1/2"3,00019,40058 GPM0.57
8FM-SS1"1" 11-1/2 NPTF2.61"2.02"1-3/4"2,0009,100100 GPM0.93

 Part #Body SizeThread Size [A]O.A.L [B]Max O.D. [C]Hex [D]Working PressureBurst PressureFlow RateWeight Lbs.
1FP-SS1/8"1/8"-27 NPTF.98".65"9/16"5,00029,9003 GPM0.03
2FP-SS1/4"1/4"-18 NPTF1.47".79"11/16"7,50033,8006 GPM0.07
3FP-SS3/8"3/8"-18 NPTF1.60"1.01"7/8"7,50034,40014 GPM0.12
4FP-SS1/2"1/2"-14 NPTF1.82"1.16"1"3,50014,00024 GPM0.23
6FP-SS3/4"3/4"-14 NPTF2.05"1.37"1-3/16"3,00019,40058 GPM0.32
8FP-SS1"1" 11-1/2 NPTF2.36"1.73"1-1/2"2,0009,100100 GPM0.52
10FP-SS1-1/4"1-1/4" 11-1/2 NPTF2.47"2.31"2"2,00010,000150 GPM0.85
12FP-SS1-1/2"1-1/2" 11-1/2 NPTF2.74"2.60"2-1/4"2,00012,000250 GPM1.45
16FP-SS2"2" 11-1/2 NPFT3.00"3.03"2-5/8"2,0009,000350 GPM1.9

 Part #Body SizeThread Size [A]O.A.L [B]Max O.D. [C]Hex [D]Working PressureBurst PressureFlow RateWeight Lbs.
1FPM-SS1/8"1/8"-27 NPTF1.15".58"1/2"5,00029,9003 GPM0.02
2FPM-SS1/4"1/4"-18 NPTF1.50".65"9/16"7,50033,8006 GPM0.05
3FPM-SS3/8"3/8"-18 NPTF1.69".79"11/16"7,50034,40014 GPM0.08
4FPM-SS1/2"1/2"-14 NPTF1.91"1.01"7/8"3,50014,00024 GPM0.13
6FPM-SS3/4"3/4"-14 NPTF2.25"1.23"1-1/16"3,00019,40058 GPM0.22
8FPM-SS1"1" 11-1/2 NPTF2.45"1.59"1-3/8"2,0009,100100 GPM0.43

Plugs

 Part #Body
Size
Thread
Size [A]
O.A.L
[B]
Max O.D.
[C]
Hex
[D]
Working PressureBurst
Pressure
Flow RateWeight
Lbs.
seriesf-plug11FPMS1/8"1/8"-27 NPTF1.15".58"1/2"4,00016,10030.02
2FPMS1/4"1/4"-14 NPTF1.50"0.65"9/16"5,50022,00060.05
3FPMS3/8"3/8"-14 NPTF1.69".79"11/16"4,50018,300140.07
4FPMS1/2"1/2"-14 NPTF1.91"1.01"7/8"3,50013,900240.13
6FPMS3/4"3/4"-14 NPTF2.25"1.23"1-1/16"3,10012,900580.21
8FPMS1"1"- 11 1/2 NPTF2.45"1.59"1-3/8"2,50010,1001000.43
10FPMS1-1/4"1-1/4" 11-1/2 NTPF2.80"2.02"1-3/4"2,50012,6001500.96
12FPMS1-1/2"1-1/2" 11-1/2 NPTF3.38"2.60"2-1/4"2,50010,0002501.46
16FPMS2"2" 11-1/2 NPTF3.58"3.03"2-5/8"2,50010,0003501.54

 Part #Body
Size
Thread
Size [A]
O.A.L
[B]
Max O.D.
[C]
Hex
[D]
Working PressureBurst
Pressure
Flow RateWeight
Lbs.
seriesf-plug21FPS1/8"1/8"-27 NPTF.98".65"9/16"4,00016,10030.03
2FPS1/4"1/4"-14 NPTF1.47".79"11/16"5,50022,00060.07
3FPS3/8"3/8"-14 NPTF1.60"1.01"7/8"4,50018,300140.11
4FPS1/2"1/2"-14 NPTF1.82"1.16"1"3,50013,900240.21
6FPS3/4"3/4"-14 NPTF2.05"1.37"1-3/16"3,10012,900580.32
8FPS1"1"- 11 1/2 NPTF2.36"1.73"1-1/2"2,50010,1001000.49
10FPS1-1/4"1-1/4" 11-1/2 NTPF2.47"2.31"2"2,50012,6001500.85
12FPS1-1/2"1-1/2" 11-1/2 NPTF2.74"2.60"2-1/4"2,50010,0002501.45
16FPS2"2" 11-1/2 NPTF3.00"3.03"2-5/8"2,50010,0003501.9

 Part #Body
Size
Hose Barb
Size [A]
O.A.L
[B]
Max O.D.
[C]
Working PressureBurst
Pressure
Flow RateWeight
Lbs.
1bs1BS1/8"1/8"1.75".63"30090030.08
2BS1/4"1/4"1.87".96"30090060.16
3BS3/8"3/8"1.87"1.13"300900140.21
4BS1/2"1/2"2.90"1.27"300900240.31
6BS3/4"3/4"3.16"1.63"300900580.49
8BS1"1"3.25"2.02"3009001000.68

 Part #Body
Size
Hose Barb
Size [A]
O.A.L
[B]
Max O.D.
[C]
Working PressureBurst
Pressure
Flow RateWeight
Lbs.
2bps2BPS1/4"1/4"1.90".56"30090060.05
3BPS3/8"3/8"2.03".63"300900140.08
4BPS1/2"1/2"2.09".75"300900240.13
6BPS3/4"3/4"2.28"1.13"300900580.21
8BPS1"1"3.28"1.38"3009001000.43

 Part #Body
Size
Hose Barb
Size [A]
O.A.L
[B]
Max O.D.
[C]
Working PressureBurst
Pressure
Flow RateWeight
Lbs.
2bpb2BPB1/4"1/4"1.90".56"30090060.06
3BPB3/8"3/8"2.03".63"300900140.08
4BPB1/2"1/2"2.09".75"300900240.13
6BPB3/4"3/4"2.28"1.13"300900580.21
8BPB1"1"3.28"1.38"3009001000.43
8BS1"1"3.25"2.02"3009001000.68


Standard Seals Are BUNA
Use Suffixes Below For
Other Seals:
-VT
(Viton)
-EP (Ethylene Propylene)
-NE (Neoprene)
-SI (Silicone)
Options:
Sleeve Lock
Use Suffix:
-SL (Sleeve Lock)

Couplers have same inside diameter as nominal pipe.
Socket Construction
• B (Brass)
• SS (303 Stainless Steel)

Plug Construction
Steel, Zinc Plated
Brass
303SS