UC200-series insert (set-screw) bearing boundary dimensions: bore d, outer (spherical) diameter D, total width B and set-screw thread for UC204 through UC212. Includes UC205 (25x52x34.1), UC206 (30x62x38.1) and UC207 (35x72x42.9), with how the insert pairs with a P / F / FL housing to make a UCP, UCF or UCFL unit. Values verified against NTN per-model data and cross-checked against a second source.
A UC insert bearing is the bearing element that fits inside a pillow block (UCP), two-bolt flange (UCF) or four-bolt / two-bolt oval flange (UCFL) housing. It has a wide inner ring that extends to one side and carries two grub (set) screws 120 degrees apart to lock it onto a plain shaft; the outer ring is spherical so the unit can self-align in its housing. UC2 is the 200 dimension series and the last two digits give the bore code (04 = 20 mm, and from 04 up the bore is the code times 5 mm). The three numbers below — bore d, outer (spherical) diameter D and width B — are the same for any maker (NTN, NSK, Asahi, FYH, SKF and others), so a UC207 is 35 x 72 x 42.9 mm whatever the brand. Values verified against NTN per-model data and cross-checked against a second source.
| Bearing | Bore d (mm) | Outer diameter D (mm) | Width B (mm) | Set screw |
|---|---|---|---|---|
| UC204 | 20 | 47 | 31 | M5 x 0.8 |
| UC205 | 25 | 52 | 34.1 | M5 x 0.8 |
| UC206 | 30 | 62 | 38.1 | M6 x 0.75 |
| UC207 | 35 | 72 | 42.9 | M6 x 0.75 |
| UC208 | 40 | 80 | 49.2 | M8 x 1 |
| UC209 | 45 | 85 | 49.2 | M8 x 1 |
| UC210 | 50 | 90 | 51.6 | M8 x 1 |
| UC211 | 55 | 100 | 55.6 | M8 x 1 |
| UC212 | 60 | 110 | 65.1 | M10 x 1.25 |
d = bore (shaft) diameter, D = outer (spherical) diameter, B = total bearing width measured across the wide inner ring, all in millimetres. The two set screws lock the inner ring to the shaft; the thread shown is the NTN-published size for that model. Sealed (double-lip) is the standard closure on this series.
The insert and its housing share the same bore code, so a UC207 insert seats in a P207 housing to make a UCP207 pillow block, an F207 housing to make a UCF207 four-bolt flange, or an FL207 housing to make a UCFL207 two-bolt oval flange. The spherical outer diameter D above is what locates the insert in the housing seat; the housing mounting dimensions (bolt spacing, height, base) are separate and are listed in the pillow-block dimension reference. To identify a loose insert, the bore d, outer diameter D and width B identify it on their own — a 35 x 72 x 42.9 mm wide-inner-ring insert with two set screws is a UC207 regardless of the print on the old one.
Boundary dimensions are nominal and provided for identification and cross-reference. Confirm against the specific bearing maker’s current data sheet before manufacture or procurement.