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Y-bearings with grub screws

Y-bearings with grub (set) screws in the inner ring are locked onto the shaft by tightening the two cup point hexagonal grub screws, positioned 120° apart. These bearings are suitable for applications for both constant and alternating direction of rotation.

Basic design bearings

Two different basic design Y-bearings with grub screws are available.
Y-bearings in the YAT 2 series (fig. 1) have an inner ring extended on one side.
Y-bearings in the YAR 2 series (fig. 2) have an inner ring extended on both sides. This reduces the extent to which the inner ring can tilt on the shaft, which enables the bearing to run more smoothly.
Bearings in both the YAT 2 and YAR 2 series are fitted with a rugged standard seal (→ Standard seals). Bearings in the YAR 2 series are fitted with an additional flinger on both sides. Flinger options are:
  • a plain sheet steel flinger, designation suffix 2F
  • a rubberized sheet steel flinger (multiple seal), designation suffix 2RF
Y-bearings in the YAT 2 and YAR 2 series have two lubrication holes in the outer ring as standard, one on each side, positioned 120° apart. Bearings without lubrication holes can be supplied on request (designation suffix W).
SKF YAT 2 and YAR 2 series bearings are available for metric shafts from 12 to 100 mm and for inch shafts from 1/2 to 3 inches.
For demanding operating conditions that occur in agricultural applications like combines and balers, harvesters and disk harrows, SKF has designed Y-bearings in the YARAG 2 series. These bearings are fitted with a patented 5-lip seal and do not have any lubrication holes in the outer ring. SKF YARAG 2 series bearings are available for metric shafts from 20 to 50 mm and for inch shafts from 1 to 1 15/16 inches.

Bearings with zinc-coated rings

Y-bearings with an inner ring extended on both sides are also available with zinc-coated rings for use in corrosive environments. Bearings in the YAR 2..-2RF/VE495 series are fitted with a highly effective multiple seal (→ Multiple seals) made of food-compatible rubber with a stainless steel insert and a stainless steel flinger on both sides. The grub screws are made of stainless steel. The bearings are filled with a food-grade grease and can be relubricated through one of the two lubrication holes in the outer ring. The lubrication holes are positioned 120° apart, one on each side.
SKF Y-bearings with zinc-coated rings are available for metric shafts from 20 to 50 mm and for inch shafts from 3/4 to 1 15/16 inches.

Stainless steel bearings

All steel components of these bearings are made of stainless steel, including rings, balls, sheet metal parts of both seals and flingers, and grub screws. The inner ring is extended on both sides. Bearings in the YAR 2..-2RF/HV series are fitted with a highly effective multiple seal (→ Multiple seals) made of food-compatible rubber with a stainless steel insert and a stainless steel flinger on both sides. They are filled with a food-grade grease and can be relubricated through the lubrication hole in the outer ring groove. This lubrication groove is located on the side opposite the locking device.
The dynamic load carrying capacity of a stainless steel bearing is less than that of a same-sized bearing made of high grade carbon chromium steel.
SKF stainless steel Y-bearings are available for metric shafts from 20 to 50 mm and for inch shafts from 3/4 to 1 15/16 inches.
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