Steel Bushing Features

boccole in acciaio caratteristiche
logo made in italy
boccole in acciaio caratteristiche
logo made in italy
logo made in italy

Sibo bushings are the result of years of experience, of continuous investments in research and development, and innovative machinery. Our steel bushings offer the best combination of raw material (made according to Sibo specifications), and purpose-designed heat treatment, to improve the mechanical features of the piece. This means high performance products that offer a longer service life and greasing intervals of up to a maximum of 550 h. Strict controls are carried out throughout the whole manufacturing processes: from the incoming raw material to the finished product, to the logistics (packing and dispatch), to assure the compliance with the required specifications.

• Standard Bushings
• Cushion Bushings
• Flange Bushes
Custom Bushings


Sibo bushings are employed as a protection against wear on all coupling systems, having a low rotation speed, combined with a high specific pressure.
It is advisable to use pins or shafts with surface hardening (C45 can fit the purpose) and tolerance H7. For a correct mounting of our bushes, we recommend H7 tolerance of the housing (max. H8).
When the bushes work under heavy friction conditions, they should be fitted in such a way as to prevent them from any radial or axial movement.


Sibo guarantees the consistency of their products’ quality by using a special steel with controlled chemical composition. In this way, the physical features of the product are assured for each lot and each single piece, and the casehardening depth is always 1-0.8 mm deep (0.031-0,039 inches).
Sibo standard material is steel type E410, classified by the international standard EN10305 (A381 in North America). Other types of steel used to produce special items are: E355 (former Fe510, standard EN10297), and E470 (standard EN 10297).
to offer prompt and regular deliveries to our customers, we always keep in stock more than 400 tons of raw material.

To sum up:
– Steel E410 (EN 10305) Werkst. N° 1.0509 – A381 in Usa – Sibo Standard.
– Steel 16MnCr5 (EN10305) Werkst. N° 1.7131

– Steel E355 (EN10297) Werkst. N° 1.0580 – Steel E470 (EN10297) Werkst. N° 1.0536


Each environment requires its own specific bushing with suitable treatments to provide the best performance under all circumstances.
Our Technical Team is available to find the treatment that best suits the application specified by the customer.
Some of the treatments that Sibo offers include: Manganese Phosphating, Nimox, Tennifer, Molicote and others.


Over 250,000 pieces are available on stock, to offer to our customers quick and regular deliveries.
The average dispatch time is about 2-3 days if the bushing is in stock. To meet their customers’ needs, Sibo can study and agree upon customised stock quantities.

Urgent shipments can be arranged.