Single-Pin Heavy Duty Clamp (13MHHM)
- Tri-Clamp Single Pin Heavy Duty Clamp
- Clamps are available in both 304 & 316L Stainless Steel.
- Pressure ratings assume wing nut tightened to 25 in/lb of torque.
- View Sizes and Dimensions
Securely connect tri-clamp ends with heavy-duty, stainless steel single-pin clamp (13MHHM)
The single-pin heavy-duty clamp with a wingnut is made from 304 stainless steel alloy (Also available in 316). It is used to join two separate tri-clamp ends to one another. Sizes on this product range from 1/2 inch all the way up to 12 inches in diameter.
A tri-clamp rubber gasket should be placed between the two flange ends to ensure proper fit and secure connection. Do not over-tighten the wing-nut as this may damage the product. The recommended amount of tension is to tighten the wing-nut until it becomes snug, then perform one more half twist for the proper amount.
How to Measure Tri-Clamp Fittings
Tri-Clamp Fittings and Gasket Sizing Guide
| 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"
Additional information
Line Drawings
| SKU | Description | Line Drawing |
|---|---|---|
| 13MHHM-.50-304 | 1/2″ – 3/4″ Single Pin Heavy Duty Clamp |
|
| 13MHHM-.50-316 | 1/2″ — 3/4″ Single Pin Heavy Duty Clamp, 316L |
|
| 13MHHM-.50-RWN-304 | 1/2″ — 3/4″ Single Pin Heavy Duty Clamp, 304, Rocket Wingnut |
|
| 13MHHM-1-304 | 1″ – 1-1/2″ Single Pin Heavy Duty Clamp |
|
| 13MHHM-1-316 | 1″ — 1 1/2″ Single Pin Heavy Duty Clamp, 316L |
|
| 13MHHM-1-RWN-304 | 1″ — 1 1/2″ Single Pin Heavy Duty Clamp, 304, Rocket Wingnut |
|
| 13MHHM-10-304 | 10″ Single Pin Heavy Duty Clamp |
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| 13MHHM-10-RWN-304 | 10″ Single-Pin Heavy Duty Clamp Rocket Wingnut |
|
| 13MHHM-12-304 | 12″ Single Pin Heavy Duty Clamp |
|
| 13MHHM-12-RWN-304 | 12″ Single Pin Heavy Duty Clamp, Rocket Wingnut |
|
| 13MHHM-2-304 | 2″ Single Pin Heavy Duty Clamp |
|
| 13MHHM-2-316 | 2″ Single Pin Heavy Duty Clamp, 316L |
|
| 13MHHM-2-RWN-304 | 2″ Single Pin Heavy Duty Clamp, 304, Rocket Wingnut |
|
| 13MHHM-2.5-304 | 2-1/2″ Single Pin Heavy Duty Clamp |
|
| 13MHHM-2.5-316 | 2 1/2″ Single Pin Heavy Duty Clamp, 316L |
|
| 13MHHM-2.5-RWN-304 | 2 1/2″ Single Pin Heavy Duty Clamp, 304, Rocket Wingnut |
|
| 13MHHM-3-304 | 3″ Single Pin Heavy Duty Clamp |
|
| 13MHHM-3-316 | 3″ Single Pin Heavy Duty Clamp, 316L |
|
| 13MHHM-3-RWN-304 | 3″ Single Pin Heavy Duty Clamp, 304, Rocket Wingnut |
|
| 13MHHM-4-304 | 4″ Single Pin Heavy Duty Clamp |
|
| 13MHHM-4-316 | 4″ Single Pin Heavy Duty Clamp, 316L |
|
| 13MHHM-4-RWN-304 | 4″ Single-Pin Heavy Duty Clamp, 304, Rocket Wingnut |
|
| 13MHHM-5-304 | 5″ Single Pin Heavy Duty Clamp, 304 |
|
| 13MHHM-6-304 | 6″ Single Pin Heavy Duty Clamp |
|
| 13MHHM-6-316 | 6″ Single Pin Heavy Duty Clamp, 316 |
|
| 13MHHM-6-RWN-304 | 6″ Single Pin Heavy Duty Clamp, 304, Rocket Wingnut |
|
| 13MHHM-8-304 | 8″ Single Pin Heavy Duty Clamp |
|
| 13MHHM-8-316 | 8″ Single Pin Heavy Duty Clamp, 316 |
|
| 13MHHM-8-RWN-304 | 8″ Single Pin Heavy Duty Clamp, 304, Rocket Wingnut |
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I purchased sanitary fittings on 3/17/23 and we are having issues installing the fittings. It seems that there is too much thread and does not allow the clamp to fully engage. Please let me know if there is any additional information needed.
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Q I purchased sanitary fittings on 3/17/23 and we are having issues installing the fittings. It see...... Read moreA This is normal. The gasket and pressure from the clamp will do the work assuming it is tightened to the recommend 25lbs torque. The two faces of the clamp do not need to meet to create a perfect seal.
Are these clamps cast or forged?
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Q Are these clamps cast or forged?A All of our clamps are cast.
Can Single-Pin Heavy Duty Clamp (13MHHM) be used for flammable liquids (Class 1, Class 2, ...)?
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Q Can Single-Pin Heavy Duty Clamp (13MHHM) be used for flammable liquids (Class 1, Class 2, ...)?A Yes, the clamp itself can be used for this type of process media. We recommend checking out our material compatibility guide for gaskets as they would actually be in contact with the media you are processing.
I'm looking into different tri-clamps available and was wondering if there's any difference in usable lifespan of your basic single pin tri-clamps vs other types (high-pressure, etc.)? Or are they all generally considered run to failure?
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Q I'm looking into different tri-clamps available and was wondering if there's any difference in us...... Read moreA
All tri-clamps that we offer should have a very long, useful life. However, given a choice between all of them, our High-Pressure Clamp is probably the most durable due to its design. This clamp requires a wrench or open then clamp by loosening both hex nuts. Since this clamp can not be swung open like most hand-tightened clamps, it's a little harder to cause stress or damage to the bolt. The pins holding the clamps together is another point of failure for some clamp manufacturers.
We are connecting and autoclaving a plastic filter to a SS connection. In my experience, I have been told that any time a plastic sanitary connection is in place, a plastic tri clamp must be used to prevent warping of the plastic. Can you confirm this? Also, does your company carry the plastic clamps?
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Q We are connecting and autoclaving a plastic filter to a SS connection. In my experience, I have b...... Read moreA
Yes, it is recommended to use the plastic tri-clamps when connecting between the two different materials. The plastic/nylon clamps are rated for much less pressure than the stainless steel clamps and there is less of a chance of overtightening the clamp which leads to the warping you mentioned.
Unfortunately, plastic fittings are not something that we get into here at the moment. There are plenty of other providers in this space however including Grainger and ColeParmer.
I have about 300 heavy duty single pin clamps with no wing nut. Can I buy just the wing nuts?
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Q I have about 300 heavy duty single pin clamps with no wing nut. Can I buy just the wing nuts?A Unfortunately, we can only sell the clamps as an entire unit.
What is the minimum recommended clearance required to fasten these clamps?
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Q What is the minimum recommended clearance required to fasten these clamps?A
Normal clearance for these types of clamps is typically 125% of the original diameter. If clearance is a concern, we recommend the High-Pressure Clamp as this can be installed in two pieces with minimal clearance needed.
Are double pin clamps superior to single pin clamps or are they for different applications?
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Q Are double pin clamps superior to single pin clamps or are they for different applications?A The difference between and of the single-pin, double, or three-segment clamps come down to flexibility. The single-pin clamp is the least flexible. If you're working with a tight situation, sometimes it's nice to have a little flexibility to maneuver the clamp into place. Each unique clamp product page lists pressure ratings per size for more information as they do vary slightly. If you have any other questions please contact us.
What can you tell us about torque when tightening the clamp wing nuts?
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Q What can you tell us about torque when tightening the clamp wing nuts?A This is a pretty common question amongst users of Tri-Clamp fittings. These clamps are designed to be hand-tightened. Even with that, these clamps can be overtightened. I usually recommend securing the clamp so that it is snug and then going another half to full turn after that. The gasket and clamp will for a leak-proof seal without the need for a super tight connection.
The pictures of these clamps on your website look like the 100-150 PSI rated versions of Single Pin Heavy Duty Sanitary Clamps (13MHHM). Please verify they are of the service duty listed on your website (500 psi at 70°F. At that rating, they should be the duty equivalent of VNE or Dixon 13MHHM clamps.
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Q The pictures of these clamps on your website look like the 100-150 PSI rated versions of Single P...... Read moreA Those clamps (13MHHM) are the equivalent of VNE or Dixon 13MHHM clamps. The pressure ratings are below and verified as being accurate. Please let me know if you have any questions.
Are sanitary fitting clamps designed to support weight?
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Q Are sanitary fitting clamps designed to support weight?A Tri-Clamp fittings, specifically the clamps, are not designed to be weight bearing. If you are planning to attach a component to your processing line it must be supported by other means. We do offer a line of tube hangers that can be used to accommodate the extra weight. Typically these tube hangers are mounted to the ceiling.
What is the height measurement of the groove?
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Q What is the height measurement of the groove?A
Hello, this is an interesting question that I have never been asked before. The groove of the single pin heavy duty clamp is going to fit the flange of the tri-clamp connection snugly when properly secured. If I understand your question correctly, you are looking for the height of this groove which should also be equal to the height of the flange.
Using a 2" clamp as an example, you can see from the sizing guide chart that the outside diameter is 2.516" and the inside diameter is 1.870". Subtracting these numbers gives us 0.646", however, this accounts for both the height of both flanges combined. Dividing by 2 the height of the flange, and the groove of the single pin clamp, should both be 0.323" or somewhere really close to this. Applying this formula to the 4" version you'll see that the height/groove size increases along with the flange size.
I hope this helps, please call with any additional questions.
Is 3" diameter of the pipe or the flange for these clamp fittings?
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Q Is 3" diameter of the pipe or the flange for these clamp fittings?A The 3" diameter refers the sanitary fitting size and neither the flange, not the tube size. In this particular case the flange will be slightly bigger than 3". The best way to imagine this is to stand your fitting, flange side down on a piece of paper and tracing it. The outside diameter of a 3" sanitary fitting is 3.717". For more information on specific flange, ID/OD, sanitary fitting dimensions please refer to our Clamp Fittings and Gasket Sizing Guide which can be found on most product pages. Thanks for asking!
