Chat with us, powered by LiveChat
A red arrow pointed back (Left)
Superlok Compression Tube Fittings


Technical Specs

Primary Connection Range:
1/4" - 1"
Secondary Connection Range:
Alt Primary Connection Range:
6mm - 25mm
Alt Secondary Connection Range:
Pressure Rating:
Body Material:
Stainless - 316L - Passivated
Port Size:
Orifice Size:
Seal Type:
Double Ferrule
Seal Material:
316L Stainless
Seat Material:


Superlok bulkhead reducing tube unions allow for two tubes of the same size to be connected through a solid panel or cover. This is especially useful in the assembly of machine cases, control panels, and meter boxes.

This product also features Superlok's patented i-Fitting technology. Identified on the fitting by the red ring, this simple solution reduces the likelihood of leaks by reducing installation steps and the need for an additional gap gauge tool. Simply insert the tube to the stop and turn with a wrench until the red ring pops away for a perfect seal every time. This system is so dependable that we warranty them against leaks and failures for life!

i-Fitting technology is available on this product in sizes 1/4" through 1" and 6mm - 25 mm.

Specialty Requirements

Superlok bulkhead fittings are also available in extra long versions for thicker panels and walls. Please contact your Mako Customer Care Rep. to request more details about your specific needs.


Contact us today to learn more about our tube x tube reducing union fittings.


Connects Fractional Tubes

Bypass extensive tube preparation and create strong seals with Superlok’s compression bulkhead connectors.

Many jobs require that you place dependable connections in confined spaces that prevent soldering and flaring as means for connecting pipes together. Tasks involving panels, tanks and other related systems make good use of these compression bulkhead fittings, which you can easily handle in smaller spaces with fewer tools.

While similar products receive criticism for lack of strength and durability when compared to other tube-joining methods, Superlok specifically designs fittings to withstand repeated vibrations, higher pressure and extreme temperature changes. We carry multiple sizes to meet the needs of your fractional tubing.

This fitting’s superior design and construct improve flow and reduce leak risk, and it’s further bolstered by Mako Product’s i-Fitting feature — which gives you a built-in gap gauge that indicates when you reach the ideal level of tightness on the seal.

End Connections

Superlok bulkhead fittings are available in a variety of end connection combinations. Tube x tube (SBHUI), tube x MNPT (SMCB), tube x FNPT (SFCB), tube x MJIC (SABUI), and tube x tube stub (SRB)

Specialty Requirements

Superlok bulkhead fittings are also available in extra long versions for thicker panels and walls. Please contact your Mako Customer Care Rep. to request more details about your specific needs.

Available tube sizes:
  • 1/8"
  • 1/4"
  • 3/8"
  • 1/2"


You can find the best compression bulkhead connector by contacting us today. Our customer service team has plenty of experience in the business, giving us insights other distributors can’t offer.

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 SBHU-1 SS-100-61 1BC1-316 CBU-1-S316 DUB-1-S 774L_1/16 SS-1-DBHU N2700-01-01-SS 1BU316 ISSD1BU
1/8"T X 1/8"T SBHU-2 SS-200-61 >2BC2-316 CBU-2-S316 DUB-2-S 774L_1/8 SS-2-DBHU N2700-02-02-SS 2BU316 ISSD2BU
1/4"T X 1/4"T SBHUI-4 SS-400-61 4BC4-316 CBU-4-S316 DUB-4-S 774L_1/4 SS-4-DBHU N2700-04-04-SS 4BU316 ISSD4BU
3/8"T X 3/8"T SBHUI-61 SS-6100-61 6BC6-316 CBU-61-S316 DUB-61-S 774L_3/8 SS-61-DBHU N2700-06-06-SS 6BU316 ISSD6BU
1/2"T X 1/2"T SBHUI-8 SS-810-61 8BC8-316 CBU-8-S316 DUB-8-S 774L_1/2 SS-8-DBHU N2700-08-08-SS 8BU316 ISSD8BU
5/8"T X 5/8"T SBHUI-10 SS-1010-61 10BC10-316 CBU-10-S316 DUB-10-S 774L_5/8 SS-10-DBHU N2700-10-10-SS 10BU316 ISSD10BU
3/4"T X 3/4"T SBHUI-12 SS-1210-61 12BC12-316 CBU-12-S316 DUB-12-S 774L_3/4 SS-12-DBHU N2700-12-12-SS 12BU316 ISSD12BU
7/8"T X 7/8"T SBHUI-14 SS-1410-61 14BC14-316 CBU-14-S316 DUB-14-S 774L_7/8 SS-14-DBHU N2700-14-14-SS 14BU316 ISSD14BU
1"T X 1"T SBHUI-16 SS-1610-61 16BC16-316 CBU-16-S316 DUB-16N-S 774L_1 SS-16-DBHU N2700-16-16-SS 16BU316 ISSD16BU
1-1/4"T X 1-1/4"T SBHU-20 SS-2000-61 20BC20-316 CBU-20-S316 DUB-20-S 774L_1 1/4 SS-20-DBHU N2700-20-20-SS 20BU316 ISSD20BU
1-1/2"T X 1-1/2"T SBHU-24 SS-2400-61 24BC24-316 CBU-24-S316 DUB-24-S 774L_1 1/2 SS-24-DBHU N2700-24-24-SS 24BU316 ISSD24BU
2"T X 2"T SBHU-32 SS-3200-61 32BC32-316 CBU-32-S316 DUB-32-S 774L_2 SS-32-DBHU N2700-32-32-SS 32BU316 ISSD32BU

Connect with Our Team

Our team is eager to help answer any questions you may have. Reach out by providing your information below and we'll gladly connect.

Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.

Contact Info


13823 Santa Fe Crossings Dr Edmond, OK 73013

Find Us
E-mail Address

E-mail Us

Local: 405-509-2665
Toll Free: 1-844-200-MAKO (6256)


Our Blog

Check out our blog for the latest updates and how-to's from Mako Products!

View All