NSK7003C1TDTP4Super-Precision Angular Contact Ball Bearing Tandem Pair – 17 mm ID, 35 mm OD, 10 mm Width, Open, 15° Contact Angle, ABEC 7, 2 Pcs

Product Description

What this part is

NSK 7003C1TDTP4 super-precision single-row angular contact ball bearings, supplied as a matched tandem pair. Bore: 17 mm. Outside Diameter: 35 mm. Overall Width: 10 mm per bearing. Total Width: 20 mm for the pair. Number Of Rows: 1 per bearing. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Bearing Material: high carbon chrome bearing steel. Series: 7000, ISO dimension series 10. Item Weight: 0.080 kg for the pair (0.18 lb), 0.040 kg per bearing.

Decoding the designation

Contact Angle: 15°, given by the C. Internal Clearance: C1, a radial internal clearance tighter than C2. Cage Material: laminated phenolic. Cage Type: machined, outer-ring land-riding. Mounting Arrangement: DT, matched tandem. Precision Class: P4, equivalent to ABEC 7 and ISO Class 4. Searchable forms of the number: 7003C1TDTP4, 7003-C1-T-DT-P4, 7003 C1 T DT P4, 7003C.

Load ratings and speed

Dynamic Load Rating: 6.6 kN (1,484 lbf) per bearing. Static Load Rating: 3.8 kN (854 lbf) per bearing. Limiting Speed: 64,100 rev/min on oil/air lubrication and 39,600 rev/min on grease. Effective load centre: 8.5 mm. Maximum Operating Temperature: 120 °C. Lubricant: grease or oil.

What these specs mean in practice

A 15° contact angle favours speed and radial rigidity over axial capacity, which is what a high-speed grinding or milling spindle wants. A tandem pair points both contact-angle lines the same way, so the two bearings share the thrust in that one direction equally and the position carries roughly the axial load of a single bearing multiplied across two rows. The rings are flush ground to the same width, so the pair clamps up without a custom spacer. P4 accuracy holds inner ring radial runout to 2.5 µm. The laminated phenolic cage is light and self-lubricating, which keeps cage friction and heat down at speed, and it sets the 120 °C maximum.

Mounting data

Shaft abutment diameter d1 min: 19.5 mm. Housing abutment diameter D1 max: 32.5 mm. Housing abutment D2 max: 33.8 mm. Bearing fillet radius r min: 0.3 mm. Fillet radius r1 min: 0.15 mm. Internal free volume: 1.9 cm³ per bearing. Pitch circle diameter for lubrication jets: 23.5 mm.

Quantity and configuration

Unit Quantity: 2 Pcs. Two bearings, matched and ground as a tandem set, 20 mm total width.

Interchange guidance

Carton designations carried on this part: 7003 C1 T DT P4 and 2MM9103 WI CR DU. The Fafnir 2MM prefix on that carton cross gives the same 15° angle and its CR token the same phenolic land-riding cage. The 17 x 35 x 10 mm envelope at 15° is shared with the SKF 7003 CD/P4A, the FAG B7003-C-T-P4S-UL and the RHP 7003CTSULP4. A 7003A5 or 7003E in this envelope carries a 25° contact angle, which makes it a related size rather than a substitution.