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SHF-25 / SHG-25 cross roller bearing references list a 67 mm bore, 110 mm outside diameter and 20.7 mm overall height. The additional d3 feature is 64.2 mm. A hollow positioning axis that includes a rotary union needs a review of the union's supports, connections and installation access as well as the bearing dimensions. This page sets out the size-25 checks for that assembly.
Compare this model with the SHF / SHG selection guide before confirming the interface.
Obtain the union drawing and identify its rotating and stationary interfaces. Show its supports, service connections and installation sequence in the same section as the bearing and reducer. The union's outside envelope, fittings and access requirements may govern the available space. Do not assess fit from the nominal bearing bore alone.
Determine whether the union introduces reaction forces or requires independent support. Its ability to transfer a service across rotating parts is a separate function from the bearing's mechanical output support. Check clearance through the intended movement and consider how the union will be removed for maintenance. A hollow-axis layout is useful only when those details work together in the assembled mechanism.
The section locates d = 67 mm and d3 = 64.2 mm at distinct diameter features. D = 110 mm describes the outer envelope. H = 20.7 mm, C = 18.7 mm, B = 19.7 mm and B1 = 7.5 mm provide axial references. In particular, the different B and C values should be checked at their marked surfaces rather than assumed to describe the overall width.
Secondary diameters d1 = 94.8 mm and d2 = 90 mm identify other interface features, and dm = 102 mm is the outer mounting circle. The existing table does not confirm hole quantity, thread size or depth. Request the controlled drawing for those details. Related entries can be browsed through the SHF / SHG bearing category without treating the family sketch as a universal fastening specification.
| Reference feature | Value |
|---|---|
| d (mm) | 67 |
| d3 (mm) | 64.2 |
| D (mm) | 110 |
| H (mm) | 20.7 |
| C (mm) | 18.7 |
| B (mm) | 19.7 |
| B1 (mm) | 7.5 |
| d1 (mm) | 94.8 |
| d2 (mm) | 90 |
| dm (mm) | 102 |
Dimensions: existing LYDL selection reference. The approved model drawing defines tolerances, variant mapping and supplied interfaces.
A union bracket or fitting may obstruct the bearing fasteners after installation. Plan tool access and the order of attachment with the surrounding equipment in place. Verify centring registers and shoulder contact separately from bolt positions. Review the depth available behind threaded connections and check that screws clear internal moving parts.
For replacement work, note whether the service hardware or flange adapter differs from the original design. A revised union arrangement can change the clearance and force path even if the bearing size is unchanged. Define those modifications on the assembly drawing before approving the component. Avoid solving an access problem by using an unverified fixing circle or altering a locating feature without engineering review.
For a hollow indexing or orienting axis, include the fixture, workpiece and service hardware. Mark the force locations and offsets relative to the bearing. State acceleration, dwell and reversal conditions, along with process forces and required life. Loads applied through a union support or service bracket should be included where they enter the driven mechanism.
Obtain confirmed dynamic, static and moment data for the supplied bearing. Original SHF and SHG gear-unit information identifies the comparison construction but does not certify a standalone LYDL component. Transmission torque and support load need separate assessment. The LYDL cross roller bearing range is useful when reviewing a different support layout, especially where the available assembly space or service route has changed.
Define runout and permissible movement at the driven flange with the measurement radius and mounted condition. Agree bearing clearance or preload, running behaviour and lubrication requirements. Test the relevant travel with the union and service connections installed, recording mechanical resistance and any contact separately. A complete reducer's positioning accuracy should not be assigned as the bearing's precision grade.
Prepare clean seats and inspect the mating registers before tightening. Confirm that the union support does not distort or unintentionally load the bearing attachment. If movement changes after adding the service hardware, identify the cause rather than adjusting acceptance to hide the difference. Keep component inspection distinct from validation of the completed rotary-service system.
Industrial robotics may use a serviced joint carrying fluid or electrical connections through the centre. Machine-tool positioning can use a hollow orienting axis with a rotary union, subject to its process-force design. Semiconductor handling can involve a transfer mechanism with routed vacuum or pneumatic services. Medical robotics may use a positioning assembly with independently validated service and device requirements.
The application illustration identifies these fields without proving fit or qualification of this model. The customer's complete drawing and operating conditions establish whether the support and central service arrangement are appropriate.
For this enquiry, identify the bore steps, seating features, fastening interfaces and agreed rotational measurements. Request records tied to the drawing revision and supplied part. Confirm any additional checks related to the mating adapter, while keeping union-system acceptance outside an ordinary bearing dimension report. Review LYDL company and manufacturing information for supplier information.
The supplied photograph marked SHF-25 may be used as a representative model image after its configuration is checked; it should not be relabelled as a different size. For packing, protect the machined faces and prevent loose hardware contact. Use real inspection and shipment imagery where available, and make representative arrangements clear in captions.
Check the entire assembled passage, fittings, support brackets and installation approach. Internal steps or adjacent parts may restrict clearance. The bearing d value alone does not establish union fit or sufficient access for attachment and maintenance.
The union's support and reaction requirements must be defined in the assembly design. Determine how its loads enter the fixed and driven structures. Do not assume that a central bearing opening supplies every support or locating feature the union needs.
They mark different axial features, listed here as 19.7 and 18.7 mm. Read them at their section locations and compare the mating surfaces. Neither should be used as a substitute for the overall H dimension.
Use it as a clearly labelled family illustration if necessary, rather than claiming it depicts another exact model. For an individual product's main image, prefer a verified photograph of the supplied size and configuration. Keep its visible marking and ALT description consistent.
Union function, service sealing, connection clearance and installed routing require assembly-level validation. Agree the bearing's dimensional and rotational checks separately. A bearing inspection report should not be presented as certification of the entire service-transfer system.
Provide the size-25 bearing section, rotary-union drawing and mounting arrangement through LYDL technical enquiry. Include the complete reducer reference, duty cycle and quantity. LYDL can then review the component interfaces and define the bearing supply scope alongside the assembly requirements.
LYDL supplies its own bearings. Referenced brand names identify comparison families; agreed drawings and order specifications define supplied performance.
