The BB10020 metric thin section ball bearing (open four-point Type X, 100 × 150 × 20 mm) from the BB series matches common crossed roller envelopes while running at lower friction torque. Dynamic radial 23.487 kN, moment 1102 N·m, clearance 0.041–0.066 mm. Order as LYDL-10020. Compare related sizes and request a drawing or quote from LYDL.
Precision axes are budgeted in microns before they are budgeted in dollars. The BB10020 fits that discipline: a 100 mm bore in a 25 × 20 mm cross section, 23.487 kN of dynamic radial capacity, a 1,102 N·m moment rating, and factory-verified radial runout held to 0.015 mm maximum. At 1.21 kg it replaces heavier paired bearing arrangements with one ring.
The open four-point (Type X) execution is the standard configuration — one row of balls, four contact points, radial and bidirectional axial and moment load all carried simultaneously. The pages below are organised the way a precision design review runs: envelope first, capacity second, accuracy budget third.
| Parameter | Symbol | Millimeters | Inches |
|---|---|---|---|
| Bore diameter | d | 100 | 3.937 |
| Outside diameter | D | 150 | 5.906 |
| Width | B | 20 | 0.787 |
| Cross section (radial × width) | – | 25 × 20 | 0.984 × 0.787 |
| Max. fillet radius | r | 1.5 | 0.059 |
The key numbers for the drawing: 100 mm bore, 150 mm outside diameter, 20 mm width, and a 1.5 mm maximum fillet at the shoulders — half a millimetre more than the smaller sections allow, which reflects the heavier rings this size works with. Inch equivalents are tabulated for legacy drawings.
| Parameter | Symbol | Value | Notes |
|---|---|---|---|
| Dynamic radial load rating | Cr | 23.487 kN (2,395 kgf) | LYDL spec = SKF Kaydon catalog |
| Dynamic axial load rating | Ca | 34.13 kN (3,480 kg) | LYDL specification |
| Dynamic moment rating | M | 1,102 N·m | LYDL spec = SKF Kaydon catalog |
| Standard diametral clearance | – | 0.041–0.066 mm | standard band at this size |
| Inner / outer ring runout (max) | – | 0.015 mm | radial runout |
| Approximate mass | m | 1.21 kg | open execution |
The 23.487 kN (2,395 kgf) dynamic radial rating and the 1,102 N·m moment rating appear in both the LYDL specification table and the SKF Kaydon BB metric catalog (KDN.39327001) — a cross-reference that supports the specification; the 34.13 kN axial rating is LYDL’s own. Static load ratings are available on request and should be requested early for slow, heavily loaded axes where static capacity governs.
Two figures decide most accuracy reviews at this size. Runout: 0.015 mm maximum, measured radially on both rings before shipment. Clearance: a manufactured diametral band of 0.041–0.066 mm — the as-made value before fits and temperature; the operating clearance is calculated per application from the fits and thermal conditions. Both are inputs to the machine-level accuracy budget — whether they suffice is an axis-level evaluation; if your budget is tighter, LYDL quotes tighter classes case by case with lead-time impact stated up front.
Each ball rides a Gothic-arch raceway with four contacts, so radial load, thrust in either direction and overturning moment all resolve inside the single row. In practical terms: a four-point ring can be evaluated as an alternative to a back-to-back angular contact pair, saving the second bearing, the spacers and the matched grinding — a design possibility that must be verified for stiffness, speed, precision and life before it replaces a proven pair. That consolidation is why the four-point design dominates thin-section engineering.
| Source | Designation | Notes |
|---|---|---|
| LYDL | LYDL-10020 | internal reference for this size |
| SKF / Kaydon | BB10020 (KDN.39327001) | BB metric thin section series |
| Envelope match | 100 × 150 × 20 mm | matches common RB-style crossed roller boundaries |
BB10020 and LYDL-10020 name the same part in the LYDL system; the SKF catalog reference for cross-validation is KDN.39327001.
Wafer-handling and inspection stages evaluate this size for the runout figure and the low inertia; machine-tool rotary axes (A-axis and trunnion duty) for the moment rating; laboratory positioning stages for the combination of both with quiet, low-torque motion. Encoder mounts at 100 mm pitch and mid-size gimbals complete the picture. Where an axis must both position precisely and survive occasional overload, the 25 × 20 mm section has margin the smaller sections lack.
| Reference model | Bore d (mm) | Outside D (mm) | Width B (mm) | Dynamic radial |
|---|---|---|---|---|
| BB9016 | 90 | 130 | 16 | 17.39 kN |
| BB11015 | 110 | 145 | 15 | 13.63 kN |
| BB11020 | 110 | 160 | 20 | 24.75 kN |
Where the design allows a larger bore and envelope, the BB11020 (110 × 160 × 20 mm) carries 24.75 kN; stepping down saves weight and envelope (see the BB8016). The complete size grid is maintained on the BB series overview page.
When the ring is clamped between two flanges — the usual arrangement at this size — the mounting sequence controls the runout more than the bearing does. Seat and squareness checks first; flange bolts tightened in stages to the specified torque, rotating the assembly between stages so the seats align; runout measured after final torque, not before. With a manufactured diametral clearance of 0.041–0.066 mm — the as-made value before fits and temperature — uneven clamping reads directly on the dial gauge. LYDL’s mounting and inspection routine is documented with every shipment.
Against the BB9016’s 17.39 kN, the BB10020 carries 23.487 kN dynamic radial and 1,102 N·m of moment — a step that usually eliminates the next bearing size from the design, along with its housing growth.
The standard execution holds radial runout to 0.015 mm maximum; whether that meets the axis requirement is a machine-level precision-budget evaluation. Tighter classes are quoted on request — confirm the class at quotation, because metrology, lead time and price all move with it.
The Gothic arch gives each ball four contacts, so radial load, thrust in either direction and moment resolve inside a single row without a second bearing. That is what lets designers evaluate it as an alternative to a paired angular-contact set and its matched spacers, subject to verification of stiffness, speed, precision and life.
Tighten flange bolts in stages to the specified torque, rotating the assembly between stages so the seats align, and measure runout only after final torque. Uneven clamping shows up directly on the gauge at the 0.041–0.066 mm manufactured clearance band.
Yes — bands shifted toward the preload side of the range are available on request with a stated lead-time impact. Provide the load spectrum and the position-hold requirement when asking, since the recommendation depends on both.
Quotations can include the inspection regime — runout records, dimensional reports, material and heat-treatment certificates — as line items. Request a quote with quantity and duty data, or use the LYDL contact page; the drawing package with the full dimension sheet is available before ordering.
Cross-checks: the SKF Kaydon BB series catalog for the western reference values, the Schaeffler PRG catalog for adjacent precision technologies, the BB series overview and thin section category for the size family. All figures are reference inputs for sizing, not application approvals.
