NPT Pipe Thread Fittings to ASME B1.20.1. Full dimensional table, materials, finishes and quotation. 16 sizes listed.
Technical Drawing
Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.
Sends the selected values to the quote form below.
Request a Quotation for NPT Pipe Thread Fittings
Tell us the size, material, finish and quantity you need for NPT Pipe Thread Fittings (ASME B1.20.1) and our team will respond within one business day. Click "Request this configuration" on the drawing above to send the parameters you just chose straight into this form.
Dimensions & Specifications (ASME B1.20.1)
Every row below is a starting point for the customizer above — pick any size and the drawing will redraw to that row.
Size
Nominal size (in)
Major diameter (mm)
Pitch (mm)
Threads per inch (TPI)
Taper
Reference standard
Notes
1/16 NPT
1/16
7.938
0.941
27
1:16
ASME B1.20.1
Tapered pipe thread, self-sealing
1/8 NPT
1/8
10.287
0.941
27
1:16
ASME B1.20.1
Tapered pipe thread, self-sealing
1/4 NPT
1/4
13.716
1.411
18
1:16
ASME B1.20.1
Tapered pipe thread, self-sealing
3/8 NPT
3/8
17.145
1.411
18
1:16
ASME B1.20.1
Tapered pipe thread, self-sealing
1/2 NPT
1/2
21.336
1.814
14
1:16
ASME B1.20.1
Tapered pipe thread, self-sealing
3/4 NPT
3/4
26.67
1.814
14
1:16
ASME B1.20.1
Tapered pipe thread, self-sealing
1 NPT
1
33.401
2.209
11.5
1:16
ASME B1.20.1
Tapered pipe thread, self-sealing
1-1/4 NPT
1-1/4
42.164
2.209
11.5
1:16
ASME B1.20.1
Tapered pipe thread, self-sealing
1-1/2 NPT
1-1/2
48.26
2.209
11.5
1:16
ASME B1.20.1
Tapered pipe thread, self-sealing
2 NPT
2
60.325
2.209
11.5
1:16
ASME B1.20.1
Tapered pipe thread, self-sealing
2-1/2 NPT
2-1/2
73.025
3.175
8
1:16
ASME B1.20.1
Tapered pipe thread, self-sealing
3 NPT
3
88.9
3.175
8
1:16
ASME B1.20.1
Tapered pipe thread, self-sealing
3-1/2 NPT
3-1/2
101.6
3.175
8
1:16
ASME B1.20.1
Tapered pipe thread, self-sealing
4 NPT
4
114.3
3.175
8
1:16
ASME B1.20.1
Tapered pipe thread, self-sealing
5 NPT
5
141.3
3.175
8
1:16
ASME B1.20.1
Tapered pipe thread, self-sealing
6 NPT
6
168.275
3.175
8
1:16
ASME B1.20.1
Tapered pipe thread, self-sealing
Manufactured to ASME B1.20.1, NPT Pipe Thread Fittings are pipe & pneumatic fittings supplied by engineeringhardware.com. The dimensional data, materials and selection notes are summarized here.
What Are NPT Pipe Thread Fittings?
NPT Pipe Thread Fittings are pipe & pneumatic fittings defined by ASME B1.20.1. They are selected by thread size and the dimensional characteristics shown below, and are available in a range of materials and finishes to suit the application and environment.
Materials & Finishes
Common materials include carbon steel (typically zinc plated or hot-dip galvanized), alloy steel in property classes 8.8, 10.9 and 12.9, and stainless steel A2 (304) or A4 (316) for corrosion resistance. Specify the material, property class and surface finish appropriate to your load and environment.
NPT Pipe Thread Fittings are stocked and supplied to order. Pricing starts from approximately US$0.20 per piece for standard sizes in carbon steel; final pricing depends on size, material, finish and order quantity (MOQ applies). Submit your exact configuration with the quote form above.
Frequently Asked Questions
Which standard governs NPT Pipe Thread Fittings, and how are they driven?
NPT Pipe Thread Fittings are manufactured to ASME B1.20.1 and use the standard drive for this product family. The dimensional values on this page follow that standard.
Which sizes of NPT Pipe Thread Fittings does engineeringhardware.com supply?
The table on this page lists 16 sizes for NPT Pipe Thread Fittings, ranging from 1/16 NPT to 6 NPT. Sizes outside the table can be quoted on request.
In which materials are NPT Pipe Thread Fittings supplied?
NPT Pipe Thread Fittings are supplied in brass, carbon steel and stainless, with finishes including zinc plating, hot-dip galvanizing and black oxide. Choose material and finish to suit the load and the service environment for NPT Pipe Thread Fittings.
How do I request a quotation?
Use the parametric drawing on this page to set the exact configuration (size, material, finish) and click "Request this configuration" — a specialist from engineeringhardware.com will respond within one business day.
