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Superlok Compression Tube Fittings


Technical Specs

Primary Connection Range:
1/16 - 2" Fractional Tube
Secondary Connection Range:
Alt Primary Connection Range:
2mm - 25mm Metric Tube
Alt Secondary Connection Range:
Pressure Rating:
Limited by tubing selection
Body Material:
No items found.
Port Size:
Orifice Size:
Seal Type:
Double Ferrule
Seal Material:
316L Stainless
Seat Material:


Superlok Tubing Unions connect two pieces of tubing that are the same size and feature Superlok i-Fitting technology on all fitting between a 1/4" and 1".

Superlok i-Fitting tube fittings and valves are manufactured with the industry's only built-in gap gauge. During installation, the compression nut is simply tightened until the gap gauge rings pop off. When the gap gauge rings pop, it signals the installer to stop. This is the point of perfect compression and seal, which provides an added level of safety and accuracy for companies worldwide. For more information and installation instructions, check out our article and video.

Superlok brings the only game changer to the tube/compression fitting and valve market. This patented innovation ends leaks that are caused by improper tightening procedures, and from the failure to check the installation with a gap gauge, which all manufacturers require. The new, leak-free technology is so precise, that Superlok extends a lifetime warranty on all tube fittings and valves. If you want it done right the first time, get Superlok!

Contact MAKO Products to inquire about pricing or place an order.


Compression Fittings Connect Fractional Tube

If you need to connect fractional tube while maintaining the ability to disconnect them at any time, you can invest in Superlok tube x tube union fittings.

While other coupler methods may require cutting to disconnect the tubing, the design of these fittings allows for easy installation and removal. These hardware pieces might not be permanent, but they are more likely to not need to be replaced like our competitor products.

Superlok focuses on pinpoint precision, and it results in reliable union seals that hold up under strenuous conditions like temperature cycling, intense vibrations and continual pulsations. From the petrochemical industry to food and beverage applications, we offer multiple sizes to fit with your circumstances.

Our i-Fitting feature also sets these union fittings apart from the rest, as it takes out the guessing work. Rather than risk under- or over-tightening the seals, which can cause leaks and/or unnecessary strain on the tubes, the self gap-gauging system will indicate when you reach optimal tightness. The fitting comes equipped with two red inspection check rings, which ensures both ends of the coupling sit at a perfectly aligned tightness level.

Available tube sizes:
  • 1/16"
  • 1/8"
  • 3/16"
  • 1/4"
  • 5/16"
  • 3/8"
  • 1/2"
  • 5/8"
  • 3/4"
  • 7/8"
  • 1"
  • 1-1/4"
  • 1-1/2"
  • 2"
  • 2mm
  • 3mm
  • 4mm
  • 6mm
  • 8mm
  • 10mm
  • 12mm
  • 15mm
  • 16mm
  • 18mm
  • 20mm
  • 22mm
  • 25mm


Contact us today to ask any questions related to our tube x tube union fittings. Our customer service team is happy to assist you in any way possible!

Cross Brand Part Number Look-Up

Size Superlok Swagelok Parker Hylok DK-LOK Hamlet Tylok Brennan Hoke SSP
1/16"T X 1/16"T SU-1 SS-100-6 1SC1-316 CUA-1-S316 DU-1-S 762L_1/16 SS-1-DU N2403-01-01-SS 1U316 ISSD1U
1/8"T X 1/8"T SU-2 SS-200-6 2SC2-316 CUA-2-S316 DU-2-S 762L_1/8 SS-2-DU N2403-02-02-SS 2U316 ISSD2U
3/16"T X 3/16"T SU-3-2N SS-300-6 3SC3-316 CUA-3-S316 DU-3-S 762L_3/16 SS-3-DU N2403-03-03-SS 3U316 ISSD3U
1/4"T X 1/4"T SUI-4 SS-400-6 4SC4-316 CUA-4-S316 DU-4-S 762L_1/4 SS-4-DU N2403-04-04-SS 4U316 ISSD4U
5/16"T X 5/16"T SUI-5 SS-500-6 5SC5-316 CUA-5-S316 DU-5-S 762L_5/16 SS-5-DU N2403-05-05-SS 5U316 ISSD5U
3/8"T X 3/8"T SUI-6 SS-600-6 6SC6-316 CUA-6-S316 DU-6-S 762L_3/8 SS-6-DU N2403-06-06-SS 6U316 ISSD6U
1/2"T X 1/2"T SUI-8 SS-810-6 8SC8-316 CUA-8-S316 DU-8-S 762L_1/2 SS-8-DU N2403-08-08-SS 8U316 ISSD8U
5/8"T X 5/8"T SUI-10 SS-1010-6 10SC10-316 CUA-10-S316 DU-10-S 762L_5/8 SS-10-DU N2403-10-10-SS 10U316 ISSD10U
3/4"T X 3/4"T SUI-12 SS-1210-6 12SC12-316 CUA-12-S316 DU-12-S 762L_3/4 SS-12-DU N2403-12-12-SS 12U316 ISSD12U
7/8"T X 7/8"T SUI-14 SS-1410-6 14SC14-316 CUA-14-S316 DU-14-S 762L_7/8 SS-14-DU N2403-14-14-SS 14U316 ISSD14U
1"T X 1"T SUI-16 SS-1610-6 16SC16-316 CUA-16-S316 DU-16N-S 762L_1 SS-16-DU N2403-16-16-SS 16U316 ISSD16U
1-1/4"T X 1-1/4"T SU-20 SS-2000-6 20SC20-316 CUA-20-S316 DU-20-S 762L_1 1/4 SS-20-DU N2403-20-20-SS 20U316 ISSD20U
1-1/2"T X 1-1/2"T SU-24 SS-2400-6 24SC24-316 CUA-24-S316 DU-24-S 762L_1 1/2 SS-24-DU N2403-24-24-SS 24U316 ISSD24U
2"T X 2"T SU-32 SS-3200-6 32SC32-316 CUA-32-S316 DU-32-S 762L_2 SS-32-DU N2403-32-32-SS 32U316 ISSD32U

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