Page 192 - 4300 Catalog Cover.pdf

G4 Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
4300 Catalog Pipe Fittings and Port Adapters
Dimensions and pressures for reference only, subject to change.
*Class 2A or 2B
Table G1 —Thread Conformance Standards
Table G2 — Standard Material Specifications for Industrial Pipe
Fittings and Adapters
Introduction
This Section contains adapters with thread types including:
NPT, NPTF, BSPT, BSPP, SAE UN/UNF, and Metric. All the
threads in this section are made to industry specifications with
conformance shown in Table G1.
Design and Construction
Shaped products (elbows, tees and crosses) are hot forged and
machined, while straights are manufactured from cold drawn
barstock. Where applicable, these products are made in con-
formance with the design criteria of the Society of Automotive
Engineers Standards, SAE J514, J530.
Parker Fluid Connector products made from steel and brass,
for the most part, have NPTF threads. Stainless steel products
may have NPT or slightly modified NPT threads to minimize the
chance of galling on assembly.
Standard Material Specifications: The standard materials
used in the manufacture of Industrial Pipe and Adapter fittings
are shown in Table G2.
Note: Upon request, pipe fittings, adapters and plugs could be
furnished in materials other than those shown in the material
specifications chart.
Finish - Zinc plating with yellow chromate (being changed to
zinc chromium 6 free) is used on all standard steel products.
Stainless steel fittings are passivated.
How Port Connections Work
Tapered (“Pipe”) Threads
There are three types of tapered threads commonly used in
industrial applications.
• NPT/NPTF
• BSPT
• Metric Taper
All three thread styles noted above use the same basicmetal-to-
metal sealing design for achieving a seal. Although very similar,
there are differences in the thread dimensions, pitch, and flank
angle that do not allow interchangeability.
NPT / NPTF Threads
NPT threads, when assembled without a sealant, leave a spiral
leak path at the crest-root junction as shown in Fig. G1. To seal
pressurized fluid, NPT threads require a suitable sealant. NPTF
threads (Dryseal), on the other hand, when assembled, do not
leave the spiral leak path. This is because they have controlled
truncationat thecrest and root, ensuringmetal-to-metal crest-root
contact prior to, or just as the male-female thread flanks make
contact as seen in Fig. G2. Upon further tightening, the thread
crests are flattened out until the flanks alsomakemetal-to-metal
contact as seen in Fig. G3. Thus, theoretically at least, there is
no passage left for the fluid to leak, provided all surfaces are
flawless and dimensions exact. In reality, this is not the case
and a sealant/lubricant is necessary to achieve a leak free
joint, even with NPTF threads. The sealant/lubricant fills all
imperfections in the surfaces affecting the seal and also provides
lubrication to ease assembly and minimize galling.
Spiral
leak path
Fig. G1 — NPT:Wrench Tight, No Crest-Root
Contact, Flank Contact Only
Thread crest and
root in contact. Gap
remains at flank
angles.
Fig. G2 — NPTF: Hand Tight,
Crest to Root Contact
Fig. G3 — NPTF:Wrench Tight, Crest to
Root and Flank Contact
Full thread
form contact
Pipe Fittings,
Adapters and Plugs
Steel
Stainless
Steel Brass
ASTM Type ASTM Type ASTM Type
Forged Bodies A576 1214/1215 A182 316 B124 CA377
Bar Stock Bodies A108 12L14 A479 316 B16
B453
CA360
CA345
Cold Formed Bodies A576 C1010 /
C1008 — — — —
Thread Standard
NPT ANSI B1.20.1, FED-STD-H28/7
NPTF SAE J476, ANSI B1.20.3, FED-STD-H28/8
BSPT BS 21, ISO 7/1
BSPP BS 2779, ISO 228/1
Metric ISO 261, ANSI B1.13M, FED-STD-H28/21
UN/UNF* ANSI B1.1, FED-STD-H28/2
Assembly and Installation
Please refer to Section T for the assembly and installation in-
structions for Pipe Fittings and Port Adapters.