Single-Pin Heavy Duty Clamp (13MHHM)

(17 customer reviews)
  • 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
Quantity - +


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 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.

Single Heavy Duty Clamps w/ Wing Nut Part Numbers & Dimensions

Single-Pin Heavy Duty Clamp Dimensions 13MHHM Single-Pin Heavy Duty Clamp Detailed Drawing & Dimensions
Size (Tube OD) Part Number Service Pressure Rating at 70°F Service Pressure Rating at 250°F Dimension (A)
1/2" - 3/4" 13MHHM-.50-304 1,500 1,200 1.062
1" - 1 1/2" 13MHHM-1-304 500 300 2.122
2" 13MHHM-2-304 450 250 2.654
2-1/2" 13MHHM-2.5-304 400 200 3.185
3" 13MHHM-3-304 350 175 3.717
4" 13MHHM-4-304 300 150 4.820
6" 13MHHM-6-304 150 75 6.695
8" 13MHHM-8-304 100 50 8.695
10" 13MHHM-10-304 75 40 10.695
12" 13MHHM-12-304 50 25 12.695

Watch How to Measure Tri-Clamp Fittings

Tri-Clamp Fittings and Gasket Sizing Guide

Sanitary Fitting Dimensions
Sanitary Size OD of Flange End ID of Tube OD of Tube
1/2″ 0.992 0.370 0.500
3/4″ 0.992 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

Reviews 17

17 reviews for Single-Pin Heavy Duty Clamp (13MHHM)

  1. BILLY JOE ADAIR (verified owner)

    Great customer service. I will order all my stainless fittings from these guys. They had all the pieces in stock I needed. I placed my order on Monday morning, it shipped the same day (FREE SHIPPING and delivered on Wednesday.)

  2. James Kimball (verified owner)

    Excellent customer service. Fast Shipping.

  3. Brandon C. (verified owner)

    Great company! Very prompt with quotes and fulfilling orders!! They’re now my go-to company for sanitary fittings and tubing! Can’t say enough good about them!

  4. Jose Nieves (verified owner)

  5. Jason S. (verified owner)

  6. Greg St Amour (verified owner)

  7. Anonymous (verified owner)

  8. Dusty Gentry (verified owner)

  9. Anonymous (verified owner)

  10. Elijah Aguilar (verified owner)

  11. Eddie V. (verified owner)

  12. Bob (verified owner)

  13. Anonymous (verified owner)

  14. Scott Stridde (verified owner)

  15. eric watts (verified owner)


  16. OREN HALE (verified owner)

    High quality high quality

  17. Brendan M. (verified owner)

    Good Part

Questions & Answers 6

Questions and answers of the customers

  1. 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.
  2. 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.
  3. Q 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.
    A 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.
  4. 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.
  5. Q What is the height measurement of the groove?

    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.

  6. 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!

Send me a notification for each new answer.