The BB8016 metric thin section ball bearing (open four-point Type X, 80 × 120 × 16 mm) from the BB series matches common crossed roller envelopes while running at lower friction torque. Dynamic radial 16.465 kN, moment 618 N·m, clearance 0.030–0.056 mm. Order as LYDL-8016. Compare related sizes and request a drawing or quote from LYDL.
Somewhere between the compact 13 mm-width sizes and the 100 mm bores, most rotary designs outgrow the 15 × 13 mm section — not because the radial load rises, but because the moment load does. The BB8016 is that step-up: an 80 mm bore in a 20 × 16 mm cross section, with the moment rating climbing to 618 N·m and the dynamic radial rating to 16.465 kN. The ring still weighs only 0.62 kg.
This page walks the selection question the way it arrives in practice: what the bigger section buys, what it costs in torque and envelope, and when to stop sizing on section and start sizing on load. The open four-point (Type X) execution is the standard configuration throughout.
Compare two catalog steps: the BB7013 (70 mm bore in the 15 × 13 mm section) carries 10.866 kN and 346 N·m, while the BB8016 (80 mm bore in the 20 × 16 mm section) carries 16.465 kN and 618 N·m — roughly 50% more radial capacity and 79% more moment capacity. Both the bore and the section grow across this step, so the gain reflects the combination of the two, not the section alone. If your design is envelope-limited, stay with the smaller section; if it is moment-limited, the 8016 is usually the cheaper axis.
| Parameter | Symbol | Millimeters | Inches |
|---|---|---|---|
| Bore diameter | d | 80 | 3.150 |
| Outside diameter | D | 120 | 4.724 |
| Width | B | 16 | 0.630 |
| Cross section (radial × width) | – | 20 × 16 | 0.787 × 0.630 |
| Max. fillet radius | r | 1 | 0.039 |
Bore 80 mm, outside diameter 120 mm, width 16 mm, with a 1 mm maximum fillet at both shoulders. The inch equivalents in the table serve drawings that still carry imperial callouts; the physical part is identical either way.
The headline figures below are cross-referenced between LYDL’s manufacturing specification and the SKF Kaydon BB metric catalog (designation KDN.39325001) — 16.465 kN (1,679 kgf) dynamic radial and 618 N·m moment. Catalog agreement supports the specification; delivered values follow the LYDL-confirmed specification. Static ratings are quoted on request — for heavily loaded slow axes, the static number governs and should be asked for early.
| Parameter | Symbol | Value | Notes |
|---|---|---|---|
| Dynamic radial load rating | Cr | 16.465 kN (1,679 kgf) | LYDL spec = SKF Kaydon catalog |
| Dynamic axial load rating | Ca | 23.71 kN (2,417 kg) | LYDL specification |
| Dynamic moment rating | M | 618 N·m | LYDL spec = SKF Kaydon catalog |
| Standard diametral clearance | – | 0.030–0.056 mm | standard band at this size |
| Inner / outer ring runout (max) | – | 0.015 mm | radial runout |
| Approximate mass | m | 0.62 kg | open execution |
Real axes rarely load a bearing in one direction. A belt or gear on the overhung end of the shaft adds radial load; the overhang itself adds moment; preload and clamping add axial. Four-point contact is built for exactly this mixture — the Gothic arch lets one row of balls carry radial load, thrust in both directions and overturning moment simultaneously, which is why designers evaluate it as an alternative to a paired angular-contact set — a substitution that must be verified for stiffness, speed, precision and life on the specific axis. Hand the full load picture to LYDL engineering and the combined-load check comes back with the quotation.
| Source | Designation | Notes |
|---|---|---|
| LYDL | LYDL-8016 | internal reference for this size |
| SKF / Kaydon | BB8016 (KDN.39325001) | BB metric thin section series |
| Envelope match | 80 × 120 × 16 mm | matches common RB-style crossed roller boundaries |
LYDL-8016 is the internal reference; BB8016 and the SKF catalog designation KDN.39325001 identify the same part in the western catalog chain.
The 80 mm bore with a 20 × 16 mm section lands squarely in collaborative-robot base joints, where moment capacity and low starting torque are both hard requirements; radar and sensor pedestals, where the open ring turns slowly under weather-sealed housings of their own; large-diameter encoders; and packaging machinery rotating heads. It is also the common upgrade when a BB7013 axis fails its moment check at design review.
| Reference model | Bore d (mm) | Outside D (mm) | Width B (mm) | Dynamic radial |
|---|---|---|---|---|
| BB7013 | 70 | 100 | 13 | 10.87 kN |
| BB9016 | 90 | 130 | 16 | 17.39 kN |
| BB10020 | 100 | 150 | 20 | 23.49 kN |
The same section continues at 90 mm bore (BB9016) and the next capacity step arrives at 100 mm with the 25 × 20 mm section — see the BB10020. Below the 8016, the 15 × 13 mm section family covers the 50–70 mm bores. The full grid from BB3010 to BB90070 is on the BB series page.
The 8016 is normally grease-lubricated and aimed at the moderate speeds typical of rotary tables, pedestals and robot joints rather than continuous high-speed spindling. Cage style and grease grade set the permissible speed; both are confirmed against your duty cycle when you request a quotation. For washdown-adjacent or dust-heavy environments, the sealed (TT) execution of the BB metric series exists at most sizes — ask for availability and the torque the seals add before the torque budget is frozen.
Radial runout is verified to 0.015 mm maximum on both rings; inspection records are available on request. Mount the open bearing clean: seat diameters and shoulder squareness checked first, packaging opened last, no finger-spinning before seating. The standard diametral clearance band of 0.030–0.056 mm is narrow enough that uneven clamping shows up directly in the runout measurement — tighten flange bolts in stages, rotating between stages.
Step up when moment, not radial load, is sizing the bearing — the moment rating climbs to 618 N·m, about 79% above the smaller-section BB7013, though that comparison also involves a larger bore. If the design is envelope-limited rather than load-limited, the 13-series is usually the better buy.
More balls at a larger pitch circle add torque, but the increase is modest and predictable — and a four-point ball set at 20 × 16 mm still starts with less torque than a crossed roller of the same envelope. LYDL supplies measured torque figures for your preload and grease at quotation.
Yes — that combination is exactly what four-point contact is built for. Size the combined duty against the 16.465 kN radial and 618 N·m moment ratings with a proper combined-load check; LYDL engineering runs it from your duty data.
Permissible speed depends on cage style, grease grade and load, so it is confirmed per application rather than published as a single figure. Rotary-table and pedestal duties are the intended range; continuous high-speed service should be reviewed with LYDL before selection.
Radial runout is measured on both rings to a 0.015 mm maximum before the bearing leaves the factory; inspection records are available on request. Tighter classes are quoted on request when the axis metrology demands them.
Include quantity, duty cycle (speed, loads, orientation) and any deviation from the standard execution when requesting a quotation — e-mail LYDL or use the contact page. The full drawing package is available before ordering.
Dimensional and load values are cross-referenced against the SKF Kaydon BB series catalog and LYDL’s manufacturing specification. Adjacent precision technologies are documented in the Schaeffler PRG catalog; the series overview and thin section category place this size in the family. All values are sizing references, not application approvals.
