SKF · mounted bearings
SKF SY 2.1/4 TF
Ball bearing units — manufacturer technical reference and quotation support in Saudi Arabia.
لطلب عرض سعر في السعودية، أرسل رقم القطعة أو المقاس والكمية والمدينة. يُرجى تأكيد التوافق والتوفر والسعر مع فريقنا.
| Shaft diameter | 57.15 mm |
|---|---|
| Centre height (pillow block) | 69.9 mm |
| Housing overall width | 60 mm |
| Centre distance between bolt holes | 190.5 mm |
| Bearing width, total | 65.1 mm |
| Attachment bolt diameter | 15.875 mm |
| Basic dynamic load rating | 52.7 kN |
| Basic static load rating | 36 kN |
| Limiting speed | 3400 r/min |
| Note | Limiting speed with shaft tolerance h6 |
| Housing type | Pillow block, normal base |
| Number of bolt holes for fasteners | 2 |
| Fastening bolt hole type | Plain |
| Retaining feature, inner ring | Set screws |
| Bore type | Cylindrical |
| Rubber seating ring | Without |
| Material, housing | Cast iron |
| Material, bearing | Bearing steel |
| Coating | Without |
| Sealing, bearing | Seal and flinger on both sides |
| Sealing type | Contact, standard |
| Sealing, unit | Optional end cover |
| Lubricant | Grease |
| Relubrication hole | With |
| Grease fitting | With |
| Unit system | Inch |
| Product net weight | 4.46 kg |
| eClass code | 23-05-08-02 |
| UNSPSC code | 31171536 |
| Compliance with standard | ISO |
| Purpose specific | For material handling applications |
| Sealing type, bearing | Contact, standard |
| Dimensions · Bore diameter · (d) | 57.15 mm |
| Dimensions · Shoulder diameter of inner ring · (d_1) · ≈ | 75.64 mm |
| Dimensions · Base width · (A) | 60 mm |
| Dimensions · Top width · (A_1) | 42 mm |
| Dimensions · Standout of end cover · (A_5) | 39 mm |
| Dimensions · Width of inner ring · (B) | 65.1 mm |
| Dimensions · Distance from locking device side face to thread centre · (B_4) | 10 mm |
| Dimensions · Height of spherical seat centre · (H) | 69.9 mm |
| Dimensions · Foot height · (H_1) | 26.5 mm |
| Dimensions · Overall height · (H_2) | 137.5 mm |
| Dimensions · Distance between attachment bolts · (J) | 190.5 mm |
| Dimensions · Maximum distance between attachment bolts · (J) · max. | 202 mm |
| Dimensions · Minimum distance between attachment bolts · (J) · min. | 179 mm |
| Dimensions · Overall length · (L) | 240 mm |
| Dimensions · Diameter of attachment bolt hole · (N) | 18 mm |
| Dimensions · Length of attachment bolt hole · (N_1) | 29.5 mm |
| Dimensions · Distance from locking device side face to raceway centre · (s_1) | 39.7 mm |
| Dimensions · Threaded hole · Housing thread for the grease fitting · (R_G) | 1/4-28 UNF |
| Dimensions · Threaded hole · Axial position of the housing thread · (R_1) | 5.5 mm |
| Dimensions · Threaded hole · Angular position of the housing thread · (R_α) | 45 ° |
| Dimensions · Grease fitting · Diameter of head sphere of grease fitting · (D_N) | 6.5 mm |
| Dimensions · Grease fitting · Hexagonal key size for the grease fitting · (SW_N) | 7 mm |
| Dimensions · Grease fitting · Thread of grease fitting · (G_N) | 1/4-28 SAE-LT |
| Dimensions · Dowel pins · Distance of dowel pins · (J_6) | 222 mm |
| Dimensions · Dowel pins · Axial offset of dowel pins · (J_7) | 21 mm |
| Dimensions · Dowel pins · Recommended diameter for dowel pins · (N_4) | 4 mm |
| Calculation data · Basic dynamic load rating · (C) | 52.7 kN |
| Calculation data · Basic static load rating · (C_0) | 36 kN |
| Calculation data · Fatigue load limit · (P_u) | 1.53 kN |
| Calculation data · Limiting speed | 3400 r/min |
| Calculation data · Dimension | Limiting speed with shaft tolerance h6 |
| Mounting information · Set screw · (G_2) | 3/8-24 UNF |
| Mounting information · Hexagonal key size for set screw | 4.763 mm |
| Mounting information · Recommended tightening torque for set screw | 16.5 N·m |
| Mounting information · Recommended diameter for attachment bolts, mm · (G) | 16 mm |
| Mounting information · Recommended diameter for attachment bolts, inch · (G) | 0.625 in |
Family specifications and selection conditions
| Product description | Pillow (plummer) block ball bearing units consist of an insert bearing mounted in a cast iron housing that can be bolted to a support surface. This variant is suitable for applications with both constant and alternating directions of rotation. It has an inner ring extended on both sides and is locked onto the shaft by tightening a set screw on the inner ring, making it easy to mount. |
|---|---|
| Manufacturer features | Strong • Ready to mount • Lubricated and sealed bearing • Quick locking onto the shaft • Cost-effective |
Manufacturer references
Follow the complete manufacturer documentation for application restrictions, materials, tolerances and installation requirements. Limits may not apply simultaneously. We do not publish inferred stock, pricing or ratings.