Tri-Clamp x Male NPT (21MP)

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The Tri-Clamp x Male NPT Adapter, which provides a secure, rust-resistant solution for simple conversions and hose adaptions.

One of our most widely used stainless steel tube fittings, this product remains a consistent choice among both amateurs and professionals due to its reliability and secure hold.

All Tri-Clamp x Male NPT Adapters are composed of long-lasting stainless steel and are available in two alloys: 304 and 316L.
The adapter features an Outside Diameter (OD) measurement from ½” up to 4”. The male NPT threaded connection varies in size from as small as ¼” up to 1”, meeting an array of needs because of its broad number of uses.

With this number of combinations, the Tri-Clamp x Male NPT Adapter can serve many bath and sanitary fitting functions and is safe for use in industries such as dairy, food and beverage, and pharmaceuticals. All Tri-Clamp x Male NPT Adapters are 21MP and use the industry-standard tri-clamp for strong, leak-free connections.

Please see the conversion chart listing the Sanitary Size, Outside Diameter of Flange End, Inside Diameter of Tube, and Outside Diameter of Tube, providing accurate measurements and ensuring that the Tri-Clamp x Male NPT Adapter will provide a superb fit. With over 20 combinations in varying sizes, the Tri-Clamp x Male NPT Adapter is the adapter of choice in most circumstances and has part compatibility with Bradford, Alfa Laval, Dixon, and more.

Tapered for sealing, often without any thread sealant; for connections in nearly every type of service. [Learn More]

How to Measure Tri-Clamp Fittings

Tri-Clamp Fittings and Gasket Sizing Guide

Sanitary Fitting Dimensions

Sanitary
Size
Flange
OD (?)
Tube
ID (?)
Tube
OD (?)
1/2″ 0.984 0.370 0.500
3/4″ 0.984 0.620 0.750
1″ 1.984 0.870 1.000
1 1/2″ 1.984 1.370 1.500
2″ 2.516 1.870 2.000
2 1/2″ 3.047 2.370 2.500
3″ 3.579 2.870 3.000
4″ 4.682 3.834 4.000
6″ 6.562 5.782 6.000
8″ 8.602 7.782 8.000
10″ 10.570 9.782 10.000
12″ 12.570 11.760 12.000

Looking for even more information on Tri-Clamp fittings?

We have everything you need. Read "The Ultimate Guide to Tri-Clamp Fittings"

21MP4-050
21MP4-075
21MP4-100
21MP4-150
21MP4-200
21MP4-250
21MP4-300
21MP4-400
21MP6-050
21MP6-075
21MP6-075050
21MP6-100
21MP6-100050
21MP6-100075
21MP6-150
21MP6-150050
21MP6-150075
21MP6-150100
21MP6-150125
21MP6-200
21MP6-2000100
21MP6-2000150
21MP6-200050
21MP6-200075
21MP6-200100
21MP6-200150
21MP6-250
21MP6-250150
21MP6-250200
21MP6-300
21MP6-300200
21MP6-400
21MP6-400300

Additional information

Line Drawings

SKUDescriptionLine Drawing
21MP-.50-316

1/2″ Tri-Clamp X 1/2″ Male NPT Adapter 316L

PDF
21MP-.50X.125-316

1/2″ Tri-Clamp x 1/8″ Male NPT, 2″ OAL, 316

PDF
21MP-.50X.375-316

1/2″ Tri-Clamp x 3/8″ Male NPT, 2″ OAL, 316

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21MP-.50X.75-316

1/2″ Tri-Clamp X 3/4″ Male NPT Adapter, 2″ OAL, 316L

PDF
21MP-.50X1-316

1/2″ Tri-Clamp X 1″ Male NPT Adapter, 2 1/4″ OAL, 316L

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21MP-.50x.25-316

1/2″ Tri-Clamp X 1/4″ Male NPT Adapter, 2″ OAL, 316L

PDF
21MP-.75-316

3/4″ Tri-Clamp X 3/4″ Male NPT Adapter 316L

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21MP-.75X.125-316

3/4″ Tri-Clamp x 1/8″ Male NPT, 2″ OAL, 316

PDF
21MP-.75X.25-316

3/4″ Tri-Clamp X 1/4″ Male NPT Adapter, 2″ OAL, 316L

PDF
21MP-.75X.375-316

3/4″ Tri-Clamp X 3/8″ Male NPT Adapter, 2″ OAL, 316L

PDF
21MP-.75X.50-316

3/4″ Tri-Clamp x 1/2″ Male NPT Adapter, 2″ OAL, 316L

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21MP-.75X1-316

3/4″ Tri-Clamp X 1″ Male NPT Adapter, 2 1/4″ OAL, 316L

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21MP-.75X1.5-316

3/4″ Tri-Clamp x 1 1/2″ Male NPT Adapter w/ Wrench Flats, 316L

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21MP-1-304

1″ Tri-Clamp X 1″ Male NPT Adapter 304

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21MP-1-316

1″ Tri-Clamp x 1″ Male NPT Adapter 316L

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21MP-1.5-304

1-1/2″ Tri-Clamp X 1 1/2″ Male NPT Adapter 304

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21MP-1.5-316

1-1/2″ Tri-Clamp X 1 1/2″ Male NPT Adapter 316L

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21MP-1.5X.125-316

1 1/2″ Tri-Clamp x 1/8″ Male NPT Adapter w/ Wrench Flats, 2.187″OAL, 316L

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21MP-1.5X.25-316

1 1/2″ Tri-Clamp x 1/4″ Male NPT Adapter, 2.438″OAL, 316L

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21MP-1.5X.375-W-316

1 1/2″ Tri-Clamp x 3/8″ Male NPT Adapter w/ Wrench Flats, 2.187″OAL, 316L

PDF
21MP-1.5X.50-304

1 1/2″ Tri-Clamp x 1/2″ Male NPT, 2.187″ OAL, 304

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21MP-1.5X.75-304

1 1/2″ Tri-Clamp x 3/4″ Male NPT w/ Wrench Flats,  2.187″ OAL, 304

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21MP-1.5X.75-316

1 1/2″ Tri-Clamp x 3/4″ Male NPT Adapter, 316L

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21MP-1.5X1-304

1 1/2″ Tri-Clamp x 1″ Male NPT Adapter, 304

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21MP-1.5X1-316

1 1/2″ Tri-Clamp x 1″ Male NPT Adapter, 316L

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21MP-1.5X1.25-304

1 1/2″ Tri-Clamp x 1 1/4″ Male NPT Adapter, 2.438″OAL, 304

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21MP-1.5X1.25-316

1 1/2″ Tri-Clamp x 1 1/4″ Male NPT Adapter, 316L

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21MP-1.5X2-WF-304

1 1/2″ Tri-Clamp X 2″ Male NPT Adapter, 2.625″ OAL, w/ Wrech Flats, 304

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21MP-1.5X2-WF-316

1 1/2″ Tri-Clamp X 2″ Male NPT Adapter, 2.625″ OAL, 316L

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21MP-1.5X2.5X3.281-316

1 1/2″ Tri-Clamp x 2 1/2″ Male NPT Adapter, 3.281″ OAL (NO HEX), 316

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21MP-1.5x.50-316

1 1/2″ Tri-Clamp x 1/2″ Male NPT Adapter, 316L

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21MP-1X.25-316

1″ Tri-Clamp x 1/4″ Male NPT Adapter, 2.187″OAL, 316L

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21MP-1X.50-304

1″ Tri-Clamp X 1/2″ Male NPT Adapter, 2.187″ OAL, 304

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21MP-1X.50-316

1″ Tri-Clamp x 1/2″ Male NPT Adapter, 2.187″ OAL, 316L

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21MP-1X.75-304

1″ Tri-Clamp X 3/4″ Male NPT, 2.187″ OAL, 304

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21MP-1X2-NH-316

1″ Tri-Clamp x 2″ Male NPT, 2.625″ OAL, 316

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21MP-1x.75-316

1″ Tri-Clamp x 3/4″ Male NPT Adapter, 2.187″ OAL, 316L

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21MP-2-304

2″ Tri-Clamp X 2″ Male NPT Adapter 304

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21MP-2-316

2″ Tri-Clamp X 2″ Male NPT Adapter 316L

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21MP-2.5-304

2-1/2″ Tri-Clamp X 2 1/2″ Male NPT Adapter 304

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21MP-2.5-316

2-1/2″ Tri-Clamp x 2 1/2″ Male NPT Adapter 316L

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21MP-2.5X.25-316

2 1/2″ Tri-Clamp x 1/4″ Male NPT Adapter, 1.405″OAL, 316L

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21MP-2.5X2-304

21MP – CLAMP X MNPT ADAPTER – 2-1/2″ X 2″ X 2.781″ OAL (NO HEX)

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21MP-2.5X2-316

2 1/2″ Tri-Clamp x 2″ Male NPT, 316L

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21MP-2X.25-316

2″ Tri-Clamp x 1/4″ Male NPT Adapter, 2.25″OAL, 316L

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21MP-2X.75-316

2″ Tri Clamp x 3/4″ Male NPT, 2.273 OAL, 316L

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21MP-2X1-304

2″ Tri-Clamp x 1″ Male NPT Adapter, 2.469″ OAL, 304

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21MP-2X1-316

2″ Tri-Clamp X 1″ Male NPT Adapter, 2.469″ OAL, 316L

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21MP-2X1.25-304

2″ Tri-Clamp x 1 1/4″ Male NPT Adapter, 2.469″ OAL W/ WRENCH FLATS, 304

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21MP-2X1.25-316

2″ Tri-Clamp x 1 1/4″ Male NPT, 2.469″ OAL, w/ Wrench Flats, 316

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21MP-2X1.5-304

2″ Tri Clamp x 1 1/2″ Male NPT, 2.469″ OAL, 304

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21MP-2X1.5-316

2″ Tri-Clamp x 1 1/2″ Male NPT, w/ Wrench Flats, 2.469″ OAL, 316L

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21MP-2X2.5-NH-304

2″ Tri-Clamp x 2 1/2″ Male NPT Adapter, 304 (No Hex)

Request Line Drawing
21MP-2X2.5-NH-316

2″ Tri-Clamp x 2 1/2″ Male NPT Adapter, 316L (No Hex)

Request Line Drawing
21MP-3-304

3″ Tri-Clamp X 3″ Male NPT Adapter 304

PDF
21MP-3-316

3″ Tri-Clamp X 3″ Male NPT Adapter 316L

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21MP-3X2-316

3″ Tri-Clamp x 2″ Male NPT Adapter, 316L

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21MP-4-304

4″ Tri-Clamp X 4″ Male NPT Adapter, 304

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21MP-4-316

4″ Tri-Clamp X 4″ Male NPT Adapter 316L

PDF
AAV00530

1/2″ Tri-Clamp X 3/8″ Male NPT Adapter, 2″ OAL, 316L

Request Line Drawing
AAV01583-304

1 1/2″ Tri-Clamp x 1″ Male NPT Adapter 304

Request Line Drawing

    I have a 1" NPT manifold need a sanitary fitting 2' clamp But need I.D. to be 1" or 1.25"
  1. Q I have a 1" NPT manifold need a sanitary fitting 2' clamp But need I.D. to be 1" or 1.25"
    A We can fabricate almost anything from our standard parts. However, all the fittings we offer are measured by the OD of the tube not the inside diameter (tube fittings). We do not offer any products that would have a 1" Inside Diameter, only a 1" Outside Diameter.
  2. Clamp 1.5" Is there an adapter male or female for 1/8" NPT?
  3. Q Clamp 1.5" Is there an adapter male or female for 1/8" NPT?
    A This is a custom item but we can manufacture it for you. 1 1/2" Tri-Clamp x 1/8" Male NPT and 1 1/2" Tri-Clamp x 1/8" Female NPT. Quantity discounts are available for this item so please contact us for more information.
  4. I am looking for a part number for the clamp x NPT combination 2 1/2" x 2" but it is not included in the part number table. I need it so that our purchasing department can order it; how can I find the part number?
  5. Q I am looking for a part number for the clamp x NPT combination 2 1/2" x 2" but it is not included...... Read more
    A The part number you are looking for is 21MP-2.5x2-316. I have added it to our table of part numbers online along with a digital download line drawing.
  6. Is this product 3A Certified?
  7. Q Is this product 3A Certified?
    A The design of this fitting does not meet 3A Specification Standards. Any fitting with threads like this one cannot be considered a 3A Sanitary.
    A The design of this fitting does not meet 3A Specification Standards. Any fitting with threads like this one cannot be considered a 3A Sanitary. 3A requires fittings to be easily cleaned and maintained. The thread design does not allow for that according to the specification.
  8. What's the difference between NPT & NPS threads
  9. Q What's the difference between NPT & NPS threads
    A

    NPS = National Pipe Straight

    NPT = National Pipe Thread

    Both NPT and NPS have the same thread angle, shape, and pitch (threads per inch). However, NPT threads are tapered and NPS threads are straight (parallel). Both threads have a 60° included angle and have flat peaks and valleys.

    Tapered Pipe Thread is commonly found on ends of pipe, nipples and fittings (i.e. couplings, elbows, tees, etc.). Note: Sharply angled threads are very critical to joint being tight with no leaks. Thread sealant or tape is typically required to complete the seal. Straight Pipe Threads need a gasket or O-ring to create a seal.

    While NPT and NPS threads will engage, they do not seal properly with each other.

  10. Do you offer different clamp x NPT size combinations like 1 1/2" x 2"?
  11. Q Do you offer different clamp x NPT size combinations like 1 1/2" x 2"?
    A Different size combinations are available however these items are not stocked and the typical lead time for these products is about 1 - 2 weeks. Please call us for special orders and we'll let you know what we can do for timing and pricing. Thanks!

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