Main characteristics Tribloc™ self-centering chucks

The main characteristics, precision, secure locking, spare parts and guarantee of self-centering chucks.

Production of self-centering chucks

Materials and heat treatments

The materials utilized for the construc- tion of Tribloc are strictly selected through tests and trials performed during manufacturing processes and after the heat treatment.

As a matter of fact, after carburizing, hardening and tempering, each single element is subjected to the Rockwell C test.

The excellent choise of the mate- rials as well as their technological and final mechanical properties, guarantee the efficiency of Tribloc, even after long use under the most varied stresses. High-resistance and special Meehanite cast-iron that has undergone stabili- zing treatment is melted into the body, cover and integral coupling. Nickel- chromemolybdenum steel alloy gears, pinion, jaws, clamp holding sliders, B clamps, key and wrench bodies, are obtained through pressing, rolling and forging. Turnable clamps (type A) are made out of C. 40 steel.

Manufacturing process and final accuracy

Tribloc self-centering chucks have served the most exacting requirements for over 40 years.

Every detail of the kinematic mechanism is grind-finished, including the coupling of clamps and spirals. Gears and various-diameter jaws and clamp grips are finished by special fixtures with construction centering, so minimising any possible concentricity or flatness error.

Each Tribloc is carefully tested according to Stanimuc standards (Federated to the Italian Standard Institute) by two separate tests and then delivered with a testing report and an "assembling instructions" leaflet.

Affinity to work

The design of the various Tribloc models of the series 33 has attached the utmost importance to tool functionality, in view of the specific requirements for use. This essential feature is made manifest by the variety of versions provided in our range of offer.

On the clamp holding slider (false jaws), an entirely ground double-dap coupling is obtained, independent from the housing size on the body, wich allows clamp reversibility on 2+2 different diametral positions, thus enlarging considerably the gripping field by the total utilization of the turnable clamps (either normal or extended).

With their set of accessories, Tribloc self-centering chucks are suitable both for mass work and tooling.

Sturdy construction

Every detail of the chuck has been designed in order to minimise ageing, processing and wear deformation, thus providing excellent sturdiness even when the tool is confronted with heavy work.

For diameters from 100 to 200, bodies are entirely turned; from diameter 225 on they are provided with 6-8 sturdy ribs connected by a double ring. The ISO 702/II - 702/III standardized coupling are integrally built in the self-centering chuck, thus strengthening their fastening to the machine.

Safe clamping

The twisting moment normally applied on the wrench that is supplied with Tribloc guarantees secure clamping, in terms of grip on both the finished part (jaws or turnable clamps of type A) and the rough part (clamps of type B in casehardened hardened steel with notched-end pyramid-frustum or strong grip jaws).

In order to clamp irregular parts, also 2-3-4 radial T-grooves are performed on the body on request, wich may open both inwards and outwards. The gear-cut gear-pinion bevel pair and shortpitch spiral, allow the highest twisting-moment reduction ratio on the move wrench.

Spare parts and guarantee

If need be, all finished or semifinished products are available in stck, consi- dering that some of them, like bodies, gears and jaws need centering alignment after snugging.

When ordered, spare parts must be accompained by the following reference details:


chuck part number.

Their guarantee covers failure due to workmanship faults for one year from date of purchase.

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Tribloc™ self-centering chucks

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