YRT850 Rotary Table Bearing | 850 × 1095 × 124 mm

YRT850 Rotary Table Bearing for Large Rotary Assemblies

The LYDL YRT850 rotary table bearing has nominal dimensions of 850 × 1,095 × 124 mm. Its two axial roller rows support axial forces in both directions and resist tilting moments; a radial roller row provides radial guidance. Within the LYDL YRT rotary table bearing range, this model combines an 850 mm bore with a 124 mm installation height. The 890 mm inner and 1,055 mm outer fixing-hole pitch circles define the mounting layout. Bearing selection must also account for the surrounding structure and load offsets. YRT series reference photograph. YRT850 nominal dimensions: 850 × 1,095 × 124 mm.

YRT850 Dimensions and Mounting Interfaces

The table separates Schaeffler’s YRTC850-XL reference from LYDL’s published YRT850 dimensions. Matching boundary dimensions do not resolve the fixing-hole differences.

Parameter	INA/Schaeffler YRTC850-XL	LYDL YRT850
Bore × OD × height	850 × 1,095 × 124 mm	850 × 1,095 × 124 mm
Mounting heights, H1 / H2	80.5 / 43.5 mm	80.5 / 43.5 mm
Outer-ring width, C	37 mm	37 mm
Inner-ring outside profile	D1 max. = 1,018 mm	d1 = 1,018 mm
Inner fixing-hole pitch circle	J = 890 mm	dn = 890 mm
Outer fixing-hole pitch circle	J1 = 1,055 mm	dm = 1,055 mm
Inner-ring fixing holes	58 × Ø18 mm	57 × Ø18.5 mm
Inner-ring counterbore	Ø26 mm × 17 mm deep	ds = Ø26 mm; Ts = 17 mm
Outer-ring fixing holes	54 × Ø18 mm	54 × Ø18.5 mm

Symbols follow each source drawing. The LYDL pattern differs in inner-hole count and both fixing-hole diameters; use the agreed drawing before machining mating components. TPI 120 also lists six M16 extraction threads for YRTC850-XL. These serve dismounting and must not be treated as mounting-screw specifications. Fixing holes, retaining-screw positions and lubrication passages require separate identification.

INA/Schaeffler YRTC850-XL Performance Reference

The following values come from Schaeffler TPI 120, with runout information from its tolerance tables. They describe the reference bearing, not guaranteed LYDL performance. LYDL can review customization against your required specification.

Reference parameter	YRTC850-XL
Dynamic axial load rating, Ca	1,020 kN
Static axial load rating, C0a	8,500 kN
Dynamic radial load rating, Cr	520 kN
Static radial load rating, C0r	1,690 kN
Limiting speed, continuous operation	50 rpm
Limiting speed, swivel operation	125 rpm
Frictional torque guide value	130 N·m, measured at 5 rpm
Standard axial / radial runout	12 / 12 µm, fitted bearing with ideal adjacent construction

Catalog speed limits use defined lubrication, mounting and thermal conditions without external application load. The swivel value is not a continuous operating allowance. Obtain LYDL load ratings, permissible speeds and stiffness data for the selected configuration before completing application calculations. Mass: Schaeffler’s online YRTC850-XL listing gives 231.4 kg; TPI 120 gives 253 kg. These are separate source values, not an agreed LYDL mass. Temperature: LYDL’s series page lists −20°C to +120°C, while TPI 120 states −30°C to +100°C for the reference family. The supplied configuration needs a defined operating range and grease specification. Planning the mounting interface? Request a YRT850 drawing and technical review. Start with the model, quantity and application. For selection assistance, add the mounting section, loads, offsets, speed and operating cycle when available.

Applications and Load Assessment

YRT850 is a candidate where the machine accommodates its 1,095 mm outside diameter:

• CNC rotary tables: fixture and workpiece support under combined machining loads.
• Swivel axes: positioning assemblies with changing load directions.
• Indexing fixtures: rotational positioning of large components.
• Measuring platforms: rotary support with specified running accuracy.

Include fixture overhang, machining forces and acceleration in the load assessment. A large bearing bore does not establish allowable workpiece weight, and a static load rating alone cannot define the machine’s working capacity. Application illustrations for YRT selection; assess the complete load cycle and available installation space.

Comparing Nearby YRT Sizes

Model	Bore × OD × height	Layout consideration
YRT650 rotary table bearing	650 × 870 × 122 mm	Smaller bore and outside footprint
YRT850	850 × 1,095 × 124 mm	850 mm bore within 124 mm height
YRT950 rotary table bearing	950 × 1,200 × 132 mm	Adds 100 mm bore and 8 mm height

Moving from YRT850 to YRT950 increases outside diameter by 105 mm. Compare these space requirements before evaluating load ratings and stiffness; dimensional growth alone does not quantify either property.

YRTS, YRTM and ZKLDF Options

Family	Function	Relevance to an 850 mm project
YRT850	Combined axial/radial roller support	Base configuration described here
YRTS	Roller-bearing design for higher-speed operation	An 850 mm version needs verified configuration data
YRTM	Bearing system incorporating angular measurement	Specify feedback interface, accuracy and installation space
ZKLDF	Double-direction angular contact ball-bearing design	No same-envelope ZKLDF850 verified in the reviewed sources

The reviewed LYDL model lists and detailed tables do not establish a YRTS850 or YRTM850 configuration. This does not rule out a custom proposal. Do not transfer a smaller model’s speed rating to an 850 mm bearing. A proposed ZKLDF-type alternative requires checks of mounting interfaces, stiffness, preload, lubrication, sealing and duty cycle. An equivalent outside envelope, if available, would establish only a substitution candidate.

Accuracy, Assembly and Packaging

LYDL lists P5, P4 and P2 accuracy options. Specify numerical runout limits and measurement conditions with the order; bearing runout does not define complete-axis positioning accuracy in arcseconds. For the Schaeffler reference, XL identifies X-life. VSP concerns the preload arrangement when an additional ring supports the L-section ring axially. These designations should not be assumed to define an identical LYDL configuration. Agree mounting-face tolerances, fits, fasteners and tightening sequence. Verify installed runout and rotational resistance. Inspection documentation can be specified for dimensions, hole geometry and running accuracy; the quotation should identify the actual report scope. For wooden-case packaging, lay the bearing flat with rust-preventive wrapping, cushioning and suitable blocking. Tape can secure the wrapping; blocking and appropriate restraints prevent movement of the bearing. Label the case with the ordered model and quantity. Inspection and packaging illustrations; shipment-specific inspection records and packing details are agreed separately.

YRT850 FAQ

Does the Ø18.5 mm hole specification mean greater internal bearing clearance?

No. LYDL’s Ø18.5 mm value describes fixing holes; Schaeffler lists Ø18 mm for YRTC850-XL. Neither value specifies internal bearing clearance or preload. Locate the assembly using the approved fits and mounting surfaces, with the bolt-hole pattern checked separately.

Does PRL50 also tighten the 80.5 mm and 43.5 mm mounting heights?

No. TPI 120 associates PRL50 with restricted runout, listing 6 µm for the 850 mm size. Tighter height tolerances use separate H1/H2 special-design designations. Restricted versions above 460 mm require manufacturer consultation; define each requested tolerance explicitly when specifying LYDL supply.

Can the 130 N·m reference determine heat generation at 50 rpm?

Not by itself. The 130 N·m guide value is measured at 5 rpm, while 50 rpm is the catalog continuous limiting speed. Friction changes with operating conditions. Thermal and drive calculations need representative torque data for the actual speed, lubrication, loading and temperature.

When should lubrication-port orientation be specified?

Before finalizing the housing and cover drawings. Provide the intended lubrication route and service-access direction, then identify the bearing passages on the approved drawing. Avoid locating covers, clamps or other components where they obstruct lubrication access or the agreed maintenance procedure.

Request a YRT850 Quotation

Request YRT850 pricing and configuration options. Send the quantity and intended application to begin. Include your drawing if available, and state whether the project needs standard rotary support, a higher-speed arrangement or angular feedback.

Engineering Standards and References

Brand references support comparison; the agreed LYDL drawing and specification define supply. The standards provide calculation and tolerance frameworks, not product certification.

1. INA/Schaeffler: TPI 120 — Precision Bearings for Combined Loads, YRTC850-XL dimensions and performance, pp. 52–55; tolerances, pp. 18–19; operating guidance.
2. INA/Schaeffler: YRTC850-XL online product data, including the separately reported mass.
3. ISO 281:2007 — dynamic load ratings and rating life.
4. ISO 76:2006 — static load ratings.
5. ISO 492:2023 — radial-bearing geometrical specifications and tolerance values.