Parker Hannifn Corporation
Parker Brass Products Division
Otsego, Michigan
Catalog 3501E
Air Brake Hose Ends
H21
H
Male Connector 68RB
Part
hose straight pipe
No.
size
thread thread
hex
l
m
d
68RB-6-4
3/8
31/32-20
1/4
31/32 2.24 1.91 .281
68RB-6-6
3/8
31/32-20
3/8
31/32 2.24 1.91 .281
68RB-6-8
3/8
31/32-20
1/2
31/32 2.38 2.06 .281
68RB-8-6
1/2
1-3/32-20
3/8
1-1/8 2.24 1.91 .390
68RB-8-8
1/2
1-3/32-20
1/2
1-1/8 2.29 2.07 .390
Male Connector Body Only 68RB
Part
hose straight pipe
No.
size
thread thread
hex
l
d
68RB-6-4B
3/8
31/32-20
1/4
31/32 1.91 .281
68RB-6-6B
3/8
31/32-20
3/8
31/32 1.91 .281
68RB-6-8B
3/8
31/32-20
1/2
31/32 2.06 .281
68RB-8-6B
1/2
1-3/32-20
3/8
1-1/8 1.91 .390
68RB-8-8B
1/2
1-3/32-20
1/2
1-1/8 2.07 .390
Male Connector with Spring Guard 68RBSG
Part
Hose
pipe
No.
size
thread hex
l
m
d
68RBSG-6-4
3/8
1/4
31/32
4.8
1.91 .281
68RBSG-6-6
3/8
3/8
31/32
4.8
1.91 .281
68RBSG-6-8
3/8
1/2
31/32
4.9
2.06 .281
68RBSG-8-6
1/2
3/8
1-1/8
5.0
1.91 .390
68RBSG-8-8
1/2
1/2
1-1/8
5.2
2.07 .390
Adapter 76RB
Part
pipe straight
No.
thread thread
hex
l
d
76RB-3/4-4
1/4
3/4-20
3/4 1.06
.31
76RB-3/4-6
3/8
3/4-20
3/4 1.12
.31
76RB-7/8-6
3/8
7/8-20
7/8 1.25
.44
76RB-7/8-8
1/2
7/8-20
7/8 1.47
.50
L
D
HEX
L
HEX
D
M
L
D
HEX
L
D
HEX
M