SNFAE330-7CE1USuper-Precision Angular Contact Spindle Bearing 30 x 72 x 19 mm, 15° Contact Angle, ABEC 7, Open

Product Description

What this part is

This is an SNFA E330-7CE1U super-precision angular contact ball bearing with a 30 mm bore, 72 mm outside diameter and 19 mm width, open on both faces. SNFA is a French super-precision bearing maker, now part of the SKF group, building bearings for machine tool spindles and other high-speed precision assemblies.

Decoding the designation

E330 gives the series and the 30 mm bore. The 7 immediately following is the precision class, ABEC 7. The digit 1 before the final letter specifies a 15° contact angle. The 30 x 72 x 19 mm envelope corresponds to the ISO 7306 size in the 73 heavy dimension series, which is why the bearing is also listed as a 7306-C — the C in that scheme likewise denoting 15°.

What these specs mean in practice

A 15° contact angle is the high-speed end of the angular contact range: less thrust capacity than a 25° or 40° bearing of the same envelope, but higher speed capability and lower heat generation. ABEC 7 tightens bore, outside diameter and running accuracy well beyond a normal-class bearing, which is what keeps spindle runout under control at speed. The heavy 73 series adds ball size and ring section over the 72 series at the same bore, so this bearing carries more load than its envelope alone would suggest for a super-precision part.

Quantity and configuration

Single bearing, 1 Pc. Straight bore, mounting directly onto a cylindrical shaft seat.

Fitting notes

Bearings of this class expect a ground and dimensionally controlled shaft and housing seat, and are handled clean. Mounting is done without heating or impact, with force applied through the ring being fitted rather than across the balls. The rings have a distinct wide face and narrow face, and the direction they are fitted determines which way the bearing takes thrust.

Interchange guidance

Same-envelope, same-angle equivalents are SKF 7306 CD/P4A, FAG B7306-C-T-P4S and NSK 7306CTRP4, all 15°, 30 x 72 x 19 mm super-precision singles. A 7306 ACD or 7306 B shares the envelope at 25° and 40° respectively, and a 7206 is the lighter 72 series at the same bore; those are related sizes rather than substitutions.