LET-LOK Tube Fittings and How They Work


Since the 1950’s the experts of HAM-LET Group have been pouring decades of time and effort in the research, development and manufacture of LET-LOK® tube fittings, a brand recognized worldwide as the leading, most advanced, and highest-quality leak-tight tube fittings around.

Discovering LET-LOK® fittings

LET-LOK® tube fittings stand out as they encompass a wide variety of cutting-edge, industrial-standard devices used to grip and seal tubing. These fittings are available in a wide range of materials to be suitable for every type of industrial use, especially fittings that operate in severe conditions and under extremely high-pressure.

LET-LOK® tube fittings also meet the increasing demand for top-quality products that can withstand use in high-performance, high-pressure vacuum environments, such as fluid, petrochemical, electronic, power, nuclear, and other key industrial applications.

The Secret Behind LET-LOK®

LET-LOK® tube connectors are made-to-order when it comes to ease-of-use. Assembly is extremely simple and requires merely placing the tube into the complete assembly until it bottoms-out against the fitting body. Next, the two ferrules are driven forward between the nut and the fitting body. The very mechanical force created by revolving the nut from left to right drives the ferrules forward.

The back ferrule is then pushed against the tapered rear of the front ferrule, while the front ferrule is driven by force it into the body’s tapered mouth. The back ferrule is radially swaged inwards on the tube, while lifting the front ferrule out to form a thorough, leak-tight seal on the tapered body’s surface. Afterwards, the 11/4 and 3/4 turn (depending on the sizes) of the nut from the hand-tight position, assures a dependable drive of the sealing parts. This also guarantees a vigorous seal against ultra-high vacuum and high-pressure environments.

Safety & Testing Guaranteed

HAM-LET sees safety as a vital factor and provides clients with a vast amount of information and instructions to make sure that they choose a product that perfectly complements their application, one which will achieve ultimate results, and will do so in the most secure and safest way.

In gas applications, for example, it is recommended to pick tubing with superior wall thickness for additional effectiveness and security. It is imperative that customers not only select products appropriate for their precise application necessities, but that they install, operate and maintain the product according to instructions. For personal safety, it is also important when choosing a LET-LOK® tube system to consider application details, material compatibility, and product ratings.

Every LET-LOK® tube fitting has been exposed to — and passed — a range of harsh tolerance tests, including those for temperature, vacuum, high-pressure, vibration, and impulse. Additionally, the fittings are produced according to severe standards using progressive computerized automation and are proved to be vigorous enough to withstand all high-pressure situations. The real secret behind their leak-tight assembly lies in their geometry and mechanical advantage.

LET-LOK® fittings are also reinforced by HAM-LET‘s pledge to use maximum quality-control standards and expert workmanship in the development of this unique and in-demand product!

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