Mario Ferri Universal joints

• Series S
• Series G-H
• Series X
• Series M
• Series AS
• Series BB  

S series 

"MF" UNIVERSAL JOINTS WITH INTEGRAL YOKES "S" SERIES - DIN 808

Integral yokes "MF" joints - S series are precision products studied to ensure exceptionally long life at competitive prices.
This extraordinary result has been achieved thanks to construction high technology devices and sophisticated machine tools.

They are made of several components and of different materials:

• Special nickel chrome alloy steel cemented and hardened for those parts which are subject to high stress and wear (R >= 200 Kgf/mm2 HRC 60 about)
• Mild steel for inner hubs and outer sleeves to allow pinning, keyways, etc.

The main characteristic of these joints is the absolute lack of carried journals or pins: this is fundamental in some emergency situations such as heavy shock loads, motion reversals and high torques.
Being the 4 yokes and their solid pins machined from one piece, the result is an extremely compact central block. The pins articulate in the central block together with the cemented bearing surface of the yokes. The combined action pin/surface raises the level of the joint output and its capability to transmit power (or torque) even in the most severe conditions.
Just a minimum part of the yokes is exposed (out of sleeves) to avoid bending.In the central block cavity there are channels bringing the lubricant from the outside grease valve to the pins.A constant lubrication is ensured by the grease reserve in the central block chamber.
Such a hermetic core structure prevents both from lubricant losses and pollution by outside agents.The maximum suggested speed is 1000 R.P.M.

• Special neoprene rubber
• Resistant to acids, oils, greases, dust, moisture
• Filled with grease, they ensure constant lubrication  

G-H series

"G" series (plain bearings) is provided with sliding bushes, while "H" series with needle roller bearings.
Joints with plain bearings are available in 2 versions:

• Version G to DIN 808
• Version GB to DIN 808/7551

Joints with roller bearings are available in 2 versions:

• Version H to DIN 808
• Version HB to DIN 808/7551

They all consist of a star wheel core and 2 half-joints with fork ends.

Between the pins of the star wheel and the holes of the forks, 4 wear-resistant sliding bushes (for G series) or roller bearing (for H series-high speed) are fitted in.
The 4 bushes have holes for lubrication. Neither lubrication nor maintenance is required for H series (high speed joints with roller bearings) as their bearings are lubricated for life.

Joints with plain bearings - G series - are for middle-low speeds and where there are shock loads.For high speeds and relatively low torques types with roller bearings (H - HB) are recommended.
Both versions offer high efficiency, silent running, low friction coefficient at competitive prices.

• All rubbing surfaces are hardened and ground
• Maximum working angle is 45° for single joints and 90° for double joints
• Maximum speed is 1000 R.P.M. for G series, while H series can reach 4000 R.P.M.
• All these joints are also supplied in telescopic version

X series

• Max angle: 45° or 90°
• Special executions on request

M series

• Special neoprene rubber
• Resistant to acids, oils, greases, dust, moisture
• Filled with grease, they ensure constant lubrication

AS series

• Material: C40
• Stock length: 1 meter
• Other lengths on request

BB series

• Material: 9 SMnPb 36
• Special executions on request