NTN7017CDG2/GNP4Super-Precision Angular Contact Ball Bearing – 85 mm Bore x 130 mm OD x 22 mm Wide, 15° Contact Angle, ABEC 7, Universally Ground

Product Description

What this part is

NTN 7017CDG2/GNP4 super-precision angular contact ball bearing, ISO 7017 size. Bore: 85 mm. Outside Diameter: 130 mm. Width: 22 mm. Bearing Type: Single-row angular contact ball bearing. Number of Rows: 1. Rolling Elements: Ball. Contact Angle: 15°. Closure Type: Open. Precision Class: P4, equivalent to ABEC 7. Preload: Normal. Dynamic Load Rating: 60 kN (13,500 lbf). Static Load Rating: 58.5 kN (13,200 lbf).

Decoding the designation

7017 — the ISO 7017 size, 85 x 130 x 22 mm, in the 70 light dimension series.

C — 15° contact angle.

DG2 — NTN’s universal flush-ground face control, so bearings of this designation stack back-to-back, face-to-face or in tandem without shims.

GN — normal preload class.

P4 — ISO tolerance class 4, equivalent to ABEC 7.

What these specs mean in practice

Contact Angle: 15°. The shallowest of the spindle angles. It favours speed and radial stiffness over thrust capacity, which is what a grinding or high-frequency milling spindle is built around.

Precision Class: P4 (ABEC 7). Bore, outside diameter, radial runout and side-face runout are held to super-precision limits, and the faces are ground so that any two bearings of this designation reach the specified preload on assembly.

Preload: Normal. A normal preload sets the ball contact geometry and removes internal play, giving repeatable axial position and predictable stiffness.

Dynamic Load Rating: 60 kN. Static Load Rating: 58.5 kN. NTN publishes both in three units: 60,000 N and 13,500 lbf dynamic, 58,500 N and 13,200 lbf static. The 70 light series keeps the outside diameter at 130 mm on an 85 mm shaft, giving the thin section a spindle nose needs.

Mounting data

Effective Load Centre (a): 25.5 mm from the bearing face. Bearing Chamfer (r min): 1.1 mm. Inner Chamfer (r1 min): 0.6 mm. Bearing Factor: 15.9.

Quantity and configuration

Unit Quantity: 1 Pc. One universally ground bearing, which mounts singly or stacks with others of the same designation into a duplex, triplex or quad set.

Cross-reference guidance

The 85 x 130 x 22 mm envelope is ISO standard. The SKF-scheme match carried on the carton is 7017 CD/P4ADGA, where CD is the same 15° angle and P4A the same super-precision class; SKF DGA is extra light preload, so it is a near match to this normal-preload bearing. In the NSK scheme the match is 7017CTYP4 or 7017CTRP4; in the RHP scheme, 7017C; in the Fafnir scheme, 2MM9117WI, where 2MM also denotes 15°. A 7017A5 or 7017E is 25° on the same seats and shifts the thrust-to-speed balance, making it a near part rather than a direct swap.

Searchable variants of the part number: 7017CDG2/GNP4, 7017CDG2GNP4, 7017-C-DG2-GN-P4, 7017C, 7017-CD/P4ADGA, 7017CD P4ADGA.