Rubber hydraulic hose and ... - Flipbook - Seite 315
How to measure non-threaded connections
Staplok
Measure the male diameter with
the O.D. portion of the caliper.
Measure the female half by
inserting the I.D. portion of the
caliper into the through hole.
Four bolt flange
First measure the port hole
diameter using the caliper. Next,
measure the longest bolt hole
spacing from center- to-center
or measure the flange head
diameter.
Dash numbers
Most fluid piping system sizes in
the United States are measured
by dash numbers. These are
universally used abbreviations
for the size of the component
expressed as the numerator of the
fraction
with the denominator always
being 16. For example,
a –04 port is 4/16 or 1/4-inch.
Dash numbers are usually
nominal (in name only) and are
abbreviations that make ordering
of components easier.
American connections
NPSM (National pipe straight mechanical)
NPTF (National pipe tapered fuel)
Tapered
Tapered
Thread
O.D.
Thread
I.D.
Thread Thread
O.D.
I.D.
Male half
Female half
This connection is still widely
used in fluid power systems, even
though it is not recommended
by the National Fluid Power
Association (NFPA) for use in
hydraulic applications. The thread
NPTF threads
Inch
size
Dash
size.
1/8
02
1/4
3/8
1/2
08
3/4
12
is tapered and the seal takes place
by deformation of the threads.
Male half
Female half
This connection is sometimes
used in fluid power systems. The
female half has a straight thread
and an inverted 30° seat. The
male half of the connection has a
straight thread and a 30° internal
chamfer. The seal takes place by
compression of the 30° seat on
the chamfer. The threads hold the
connection mechanically.
Measure thread diameter and subtract
1/4-inch to find the nominal pipe size.
Nominal
thread
size
Male thread
O.D. inch
A properly chamfered
NPTF male will also seal with the
NPSM female.
NPSM threads
Female thread
I.D. inch
Inch
size
Dash
size.
Fract.
Dec.
Frac.
Dec.
1/8-27
13/32
0.41
3/8
0.38
1/8
02
04
1/4-18
17/32
0.54
1/2
0.49
1/4
06
3/8-18
11/16
0.68
5/8
0.63
3/8
1/2-14
27/32
0.84
25/32
0.77
1/2
08
3/4-14
1 1/16
1.05
1
0.98
3/4
12
Nominal
thread
size
Male thread
O.D. inch
Female thread
I.D. inch
Fract.
Dec.
Fract.
Dec.
1/8-27
13/32
0.41
3/8
0.38
04
1/4-18
17/32
0.54
1/2
0.49
06
3/8-18
11/16
0.68
5/8
0.63
1/2-14
27/32
0.84
25/32
0.77
3/4-14
1 1/16
1.05
1
0.98
1
16
1-11 1/2
1 5/16
1.32
1 1/4
1.24
1
16
1-11 1/2
1 5/16
1.32
1 1/4
1.24
1 1/4
20
1 1/4-11 1/2
1 21/32
1.66
1 19/32
0.58
1 1/4
20
1 1/4-11 1/2
1 21/32
1.66
1 19/32
0.58
1 1/2
24
1 1/2-11 1/2
1 29/32
1.90
1 13/16
1.82
1 1/2
24
1 1/2-11 1/2
129/32
1.90
1 13/16
1.82
2.30
2
32
2-11 1/2
2 3/8
2.38
2 5/16
2.30
2
32
2-11 1/2
2 3/8
2.38
2 5/16
EMEA Danfoss rubber hydraulic hose, fitting, tooling and accessories category catalog
315
Danfoss | Safety information
Non-threaded connections, American connections
