NSK7026CTDULPA7Angular Contact Ball Bearing Pair, Super Precision — NSK 7026CTDULPA7, 130x200x33 mm, 15° Contact Angle, Light Preload, Phenolic Cage, 2 Pcs

Product Description

What this part is

NSK 7026CTDULPA7 is a universally ground pair of single-row super-precision angular contact ball bearings from the 70 series. Bore Diameter: 130 mm. Outside Diameter: 200 mm. Overall Width: 33 mm. Contact Angle: 15°. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Number Of Rows: Single Row. Bearing Material: Bearing Steel. Series: 70 Series. Base Number: 7026C.

Dynamic Load Rating: 163,000 N per bearing. Static Load Rating: 137,000 N per bearing. Limiting Speed: 7,000 rpm grease; 10,700 rpm oil. Item Weight: 3.22 kg (7.10 lb) per bearing. Load ratings and mass are quoted per bearing, not for the set.

Decoding the designation

7026 — 70 series super-precision angular contact ball bearing on a 130 mm bore.

C — 15° contact angle.

T — phenolic resin cage, outer-ring guided.

DU — duplex universal pair, ground so the two bearings mount back-to-back, face-to-face or in tandem.

L — light preload class.

PA7 — an NSK internal accuracy designation.

What these specs mean in practice

The 15° contact angle biases capacity toward radial load and lifts the speed ceiling relative to steeper 25° and 30° angles, which is why the C angle dominates machine-tool spindle work. Preload: Light (L). Cage Material: Phenolic. Cage Type: Outer-ring guided. Lubricant: Grease or oil / oil-air.

At a 130 mm bore the ball-track surface speed is high enough that the limiting speeds sit well below those of the smaller sizes in the same series, and the light preload class keeps frictional heat down where thermal growth in a large spindle would otherwise drive preload upward in service. Universal grinding means the offset ground into each ring face sets the preload automatically once the pair is clamped, without shims or spacers.

Mounting data

Effective load centre a: 38.6 mm. Permissible axial load Pa: 86.0 kN. Minimum shaft abutment diameter da: 140 mm. Maximum housing abutment diameter Da: 190 mm. Maximum housing abutment diameter Db: 194 mm. Maximum shaft fillet radius ra: 2 mm. Maximum housing fillet radius rb: 1 mm. Minimum chamfer dimension r: 2 mm. Minimum chamfer dimension r1: 1 mm. Recommended grease quantity: 17 g per bearing.

Quantity and configuration

Unit Quantity: 2 Pcs. Mounting Arrangement: Duplex universal pair (DU).

Interchange guidance

Comparable 130x200x33 mm super-precision 15° angular contact bearings are catalogued by other makers as SKF 7026 CD/P4A, FAG B7026-C-T-P4S, Timken/Fafnir 2MM9126WI, RHP 7026CTDU, Koyo 7026C, NTN 7026CG/GNP4 and GMN S 6026 C. Preload class, cage, accuracy grade and set quantity must be matched code for code before any of these is treated as a drop-in.