NSK7220CTYDUMP4Angular Contact Ball Bearing, Super Precision — NSK 7220CTYSUMP4, 100x180x34 mm, 15° Contact Angle, Medium Preload, ABEC 7 / P4

Product Description

What this part is

NSK 7220CTYSUMP4 is a single-row super-precision angular contact ball bearing from the 72 series. Bore Diameter: 100 mm. Outside Diameter: 180 mm. Overall Width: 34 mm. Contact Angle: 15°. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Number Of Rows: Single Row. Bearing Material: Bearing Steel. Series: 72 Series. Base Number: 7220C.

Dynamic Load Rating: 188,000 N per bearing. Static Load Rating: 127,000 N per bearing. Limiting Speed: 8,300 rpm grease; 12,500 rpm oil. Item Weight: 3.18 kg (7.01 lb) per bearing. Load ratings and mass are quoted per bearing.

Decoding the designation

7220 — 72 series super-precision angular contact ball bearing on a 100 mm bore, a heavier section than the 70 series at the same bore.

C — 15° contact angle.

TY — ball-guided cage.

SU — single bearing, universally ground, so like bearings pair in any arrangement.

M — medium preload class.

P4 — NSK precision grade equating to ABEC 7 / P4.

What these specs mean in practice

The 72 series carries a thicker cross-section than the 70 series on the same bore, which is why this 100 mm bore bearing reaches a 180 mm outside diameter and a 34 mm width and carries load ratings roughly double those of a 70 series bearing of the same bore. Precision Class: ABEC 7 / P4. Preload: Medium (M). Cage Type: Ball-guided. Lubricant: Grease or oil / oil-air.

The 15° contact angle biases capacity toward radial load and lifts the speed ceiling relative to steeper 25° and 30° angles. A ball-guided cage centres itself on the rolling elements rather than on a ring land, removing cage-to-land rubbing. Medium preload raises rigidity over the light class in exchange for additional heat generation.

Mounting data

Effective load centre a: 35.7 mm. Permissible axial load Pa: 88.5 kN. Minimum shaft abutment diameter da: 112 mm. Maximum housing abutment diameter Da: 168 mm. Maximum housing abutment diameter Db: 173 mm. Maximum shaft fillet radius ra: 2 mm. Maximum housing fillet radius rb: 1 mm. Minimum chamfer dimension r: 2.1 mm. Minimum chamfer dimension r1: 1.1 mm. Recommended grease quantity: 18 g per bearing. Calculation factor f0: 14.5.

Quantity and configuration

Unit Quantity: 1 Pc. Mounting Arrangement: Single, universally ground (SU).

Interchange guidance

The closest matches are the 15° medium-preload universal singles Fafnir 2MM220WI-SUM, FAG B7220-C-T-P4S-UM, RHP 7220CTSUMP4 and GMN S6220 C TA P4 DUM, which use a phenolic cage in place of this bearing’s ball-guided TY cage. NSK 7220CTRSUMP4 is the phenolic-cage version of this bearing and NSK 7220CTYSULP4 the light-preload version. SKF 7220 CD/P4A and Koyo 7220C share the 100 x 180 x 34 mm size and 15° angle but are not universally ground to a preload.