BB6013 Metric Thin Section Ball Bearing – 60 × 90 × 13 mm

If your drawing already calls for a 60 × 90 × 13 crossed roller bearing, read this page as a substitution note. The BB6013 matches that envelope exactly — same bore, same width, same 15 × 13 mm cross section — but replaces interleaved rollers with a single row of four-point balls. At 0.30 kg the ring is light; its 9.905 kN dynamic radial rating and 279 N·m moment rating address the load range of many rotary-table and indexing duties — verify your actual duty cycle against them before switching.

What typically changes is the way it runs: lower starting torque, less grease churn and quieter motion — a difference LYDL can verify against your duty data before the switch. What you trade is some moment stiffness — a trade that should be made against your measured load spectrum, not by rule of thumb.

Why switch away from crossed rollers at 60 mm?

Three costs push designers off the roller at this bore. Torque: roller line contact drags more at every start, which matters to battery-driven and servo-limited axes. Maintenance: cage behaviour under contamination and oscillation differs between roller and ball designs and should be reviewed against the actual duty cycle. Price and delivery: the BB metric series is produced as a thin section ball line, with the economies that brings. Against these, the roller’s stiffness advantage remains real — if the axis is stiffness-critical under intermittent cutting loads, it may still be the right choice.

Envelope check before the swap

Confirm four dimensions before ordering — and treat the substitution as an engineering change that still requires confirmation of stiffness, combined loads, life, mounting support and precision: 60 mm bore, 90 mm outside diameter, 13 mm width, and a 1 mm maximum fillet at both shoulders. The seat surface finish on the existing housing is as important as the numbers — a scratched or bell-mouthed seat will degrade the runout you are paying to keep.

Ratings for the replacement axis

The BB6013 carries a 9.905 kN (1,010 kgf) dynamic radial rating, a 14.08 kN dynamic axial rating and a 279 N·m moment rating — radial and moment figures that agree between the LYDL specification table and the SKF Kaydon catalog entry (KDN.39323001). Run the duty cycle of the existing axis against these values; if the roller was oversized for stiffness rather than load, the ball bearing frequently passes with margin.

The radial, axial and moment ratings above are independent maximums and are not simultaneously attainable at full value — combined duty requires a combined-load calculation.

Designation cross-reference

On the replacement drawing, cite BB6013 or LYDL-6013; when procurement validates against the western catalog, the SKF designation KDN.39323001 identifies the same envelope and ratings.

Rigidity trade-offs and preload strategy

Rollers win moment stiffness by geometry, not by grade — plan around it. If the BB6013 replaces a preloaded roller, a light ball preload preserves most of the torque advantage you switched for; medium preload recovers stiffness at a measurable torque cost. Two configurations should not be confused: the standard execution ships with the 0.030–0.056 mm diametral clearance band — a positive (as-manufactured) clearance, not preload — while a preloaded configuration is a separately confirmed option in which preload is built through fits or ring adjustment and the torque budget changes accordingly. Give LYDL the load spectrum and the position-hold requirement, and the preload recommendation comes back with the quotation.

Duties where the BB6013 performs best

The size finds its way into machine-tool rotary tables and indexing heads, where its envelope was almost certainly specified by a roller originally; robot wrists and fifth axes in automation cells; medium rotary encoders and resolver mounts; and inspection fixtures rotating under light load. The common thread is moderate moment load with a demand for smooth, low-torque motion.

A substitution checklist that travels with the job

1. Measure the housing seat and shaft journal; verify 90 mm and 60 mm against the table above with the actual, worn dimension.
2. Check both shoulder fillets against the 1 mm maximum; grind back any oversize radius.
3. Flush the housing cavity — old roller grease and debris are the main cause of noisy ball replacements.
4. Fit the inner ring first with clean, even force; never drive the balls of an open four-point bearing through an unlubricated assembly.
5. Charge the free space to roughly one-third with the recommended grease and hand-rotate through full cycles.
6. Record a runout baseline against the 0.013 mm factory figure so any later degradation is traceable.

Adjacent sizes for the next revision

Should the next machine generation need more capacity, the BB8016 steps up both bore and section; within the same 15 × 13 mm section, the BB5013 sits below and the BB7013 above. The complete grid lives on the BB series overview page.

Mounting notes for housings already in service

Retrofit jobs add two cautions to a normal install. First, seating: a housing that has run a roller may have a polished or slightly brinelled seat — measure it, do not assume the nominal. Second, contamination: the open bearing has no seals, so mount it last in the build sequence, after machining and washing are done. The packaging and inspection routine LYDL ships with every ring is shown alongside.

Substitution questions from the field

Can the BB6013 replace an RB6013-style crossed roller bearing without machining the housing?

The 60 × 90 × 13 envelope transfers directly, because the BB metric family matches crossed roller bores and widths by design — but a like-for-like substitution still needs confirmation of stiffness, combined loads, life and precision for the specific axis. Verify the housing seat finish and the 1 mm shoulder fillet before ordering; the swap is only as good as the seat it lands on.

How much moment rigidity is lost going from rollers to four-point balls?

Roller line contact is inherently stiffer in moment, and no ball bearing of the same envelope fully closes that gap. What you gain is lower starting torque, lower grease churn and quieter running — so the decision is a trade, best made against your actual load spectrum. LYDL engineering runs the comparison on request.

What preload suits a rotary table that must hold position under intermittent cutting loads?

Keep two configurations apart: the standard execution is the 0.030–0.056 mm diametral clearance band — a positive clearance, not preload; a preloaded configuration is a separately engineered option with different torque and temperature behaviour. For a 60 mm table axis, the choice is best made with LYDL against the position-hold requirement and the torque budget.

What first grease charge and running-in procedure does LYDL recommend?

Fill roughly one-third of the free space with a channeling-type grease, rotate slowly through full cycles to distribute it, and monitor temperature through the first hour of duty. LYDL confirms the grease type and charge for your speed and shaft orientation at order time.

Does the clearance band change when the housing is aluminium rather than steel?

The manufactured band stays 0.030–0.056 mm, but differential expansion between aluminium and bearing steel shifts the working clearance as temperature moves. Provide the housing material and operating temperature range when requesting the fit recommendation.

Quotation, lead time and documentation

Quotations for the BB6013 include the runout verification level and clearance band as standard line items. Request a quote with your quantity and duty data, or use the LYDL contact page; the drawing package is available before you commit.

Source data and standards

Ratings on this page are cross-checked against the SKF Kaydon BB series listing; for the precision-roller side of the comparison see the Schaeffler PRG catalog. The BB series overview and the thin section category place the size in context. Values are reference data for sizing, not a substitute for application review.