SKF YAR 211-2F Insert Bearing with Grub Screws, 55 mm

A 55 mm insert bearing that clamps to the shaft with two grub screws

The SKF YAR 211-2F is an insert bearing, also called a Y-bearing, with a 55 mm bore, 100 mm outside diameter and an inner ring extended on both sides to 55.6 mm. It is based on a sealed deep groove ball bearing with a spherical outside surface, so it seats in a matching housing and can align itself during mounting. SKF describes this grub screw variant as suitable for applications with both constant and alternating directions of rotation; it is locked on the shaft by tightening two set screws on the inner ring, which makes it quick to mount and keeps noise and vibration low.

Insert bearings are normally supplied inside a housing as a ready-to-mount unit and are common on conveyors, agricultural machines, fans, blowers, packaging and food-processing lines where the shaft is a plain commercial bar and no shoulders or nuts are wanted. The 2F suffix designates the standard seal arrangement of a contact seal with flinger on both sides, and the bearing carries a lubrication feature so grease can be added through a grease fitting in the housing.

Technical specifications

Neighbouring sizes of the YAR 2 series

The rows come from the SKF Y-bearings table for metric shafts with grub screws. C in the table is the outer ring width, and the speed is limited with a shaft tolerance of h6.

Matching housings and selection

The SKF catalogue lists the housings that accept the YAR 211-2F: the pillow block types SY 55 TF and SY 511 M (and the SYJ 55 TF and SYJ 511 types), the two-bolt flanged FY 55 TF and FY 511 M (and FYJ 55 TF), the four-bolt flange FYC 55 TF and FYC 511, and the take-up unit TU 55 TF and TU 511 M. The housing size is the key link: always order the bearing and housing as a matched pair, and a complete unit such as the SY 50 TF is a different bore from this 55 mm bearing.

The 2F version is the standard for general industrial duty. The 2RF version has a different seal and a lower speed rating of 1,900 r/min in the catalogue table; if you need the unit to run in a wet washdown, ask for the right housing and seal variant. Grub screw locking suits smooth shafts with a tolerance of h6 or h7 and light or moderate loads; for heavy or shock loads or reversing drives, a bearing with a different locking method may be a better choice. The grub screws should be tightened to the torque specified for the size and rechecked after the first run. Compare the SKF 6206-2RS1 for a conventional sealed deep groove bearing. Mounted bearings and housings are grouped under Mounted Bearings & Housings.

Related SKF products: SKF FYTB 50 TF Oval Flanged Ball Bearing Unit, 50 mm, SKF SY 50 TF Pillow Block Ball Bearing Unit, 50 mm, SKF SNL 513-611 Split Plummer Block Housing and SKF H 313 Adapter Sleeve with KM 13 Lock Nut and MB 13 Washer.

Documents and ordering

The attached document is the SKF Y-bearings and Y-bearing units catalogue (also hosted on the SKF 50 mm unit page of this site), with the product tables, designs and mounting guidance. Send the designation YAR 211-2F, the housing designation if you need a complete unit, and the quantity. Seven Star LLC is an independent supplier in Muscat; availability and lead time are confirmed per enquiry.