High Italian quality power transmission parts.

A constantly evolving workshop without any stop. 



The founder is Mr Sassi Giuseppe who was born in 1947. Thanks to his mechanical skills he was able to use them on traditional or updated machineries such as CNC ones.

After his customers demands and thanks also to his mechanical needs he started to think about a tensioning solution for chains or belts.

So he started trying the spring ones and after many years of tests he had the first tensioner the type TO that nowadays is the most popular and bed imitated.

Over time he made various type of TO even if he keeps thinking to a different product.

And so the idea derived from a conversation with his friend. He thought about the car or truck clutch . So he made the most famous of our tensioners the type TC that until today is the most imitated... 

One day ZETASASSI® was born… 


Today :

We have been producing for 38 years automatic chain and belt tensioners, torque limiters and mechanical constructions.

We design and build automatic machines used to move or work our items.

Our Company is family run and we are very careful for any detail when we choose  raw material and natural resources ( 95% from Italy/Europe and 5% ( Asia/America ). 

The most important element is our experience, expertise and employment stability.

-Employees with socio-economic degree 30%;

-Computer skills 100% ( 30% at a very high level);

-Foreign languages 50% English- 35% up to 4 foreign languages;

-Permanent contracts 93%;

-Average length of service 15 years;

-Average age 40 years; 

Every single item means a customized management.Production, set up and quality control have the same purpose . 

“Italian quality that defies time and avoids troubles”.We have many distributors all over the world and thanks to our cooperation we can have International market. 

We have been producing  for 20 years motorbike spare parts and our brand name is known also at worldwide level  thanks to team and drivers cooperation with our Staff.

Work experience, parts test on circuit races and passion are the most important elements to get high Italian quality products. 

Our strong points are :

-Prompt delivery;

-Lack of minimum quantity to be ordered;

-Best availability to fulfil “research and development” projects;

-Technical support at 360°;

-Quality, reliability and courtesy;

-Quick reply, orders management and shipment; 


Since 1979 the name Sassi has symbolized design and manufacture of products devoted to tensioning and protecting transmissions in Italy and throughout the world.

Since then, it has continued to grow and innovate, maintaining its classical  line of the highest quality and offering a complete range of services from design and production through  technical assistance all the way to prompt delivery at all times.

Early in the 90s the company name became PMZ-SASSI, and it held many patents in the mechanical field.  We are the first in Italy and third worldwide in the construction and design of tensioning systems for the transmissions of industrial machines in general. In this catalogue we present the various lines of tensioners, chain tensioners, belt tensioners, torque limiters, axial limiters, automatic lubricators and adjustable cams.

All these products are manufactured directly in Italy in the original  lathe shop owned by the Sassi family, where industrial machinery and equipment  are designed and produced.We are proud to claim over 40 years’ experience in mechanical constructions in general.

The versatility and high quality of our products has always distinguished us on the market and it is thanks to our vast warehouses that we are able to fill  orders for any quantity in less than 12 hours from receipt of the order.

As direct manufacturers, and having our  raw material suppliers in Italy, we can alter products in the catalogue to meet special requests or create new ones to measure for every need, with very high quality control.

We feel it is important to stress that you will find here only ORIGINAL ZETASASSI® material Made in Italy created from our ideas and developed together with you. Indeed, all our products are branded ZETASASSI®, and that is  synonymous with quality, long life and service. 


An imitation is never anything but an imitation,

the original contains the past, the present and the future.

We create reliability that lasts and that means savings …

.... often imitated but never equaled!

Italian excellence always at your side and at your service...