Timing Belt Pulleys and V-Belt Sheaves: Matching Belt Drive Components Correctly
Belt drives may appear simple, consisting of two wheels and a belt for power transfer.
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Super-precision angular contact spindle bearing pair, 17x40x12 mm; 15° contact angle, phenolic cage, tandem-matched (DT), ABEC 7. Matched set, 2 Pcs.
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Here are some other options that might fit your project — cross-referenced equivalents and similar parts we have in stock and ready to ship. Need help choosing? Call 585-295-7880.
Angular Contact Ball Bearing — 45 mm ID, 85 mm OD, 19 mm Width, Single Row, 30° Contact Angle, Pressed Steel Cage$47.89
Angular Contact Ball Bearing — 50 mm ID, 90 mm OD, 20 mm Width, Single Row, 30° Contact Angle, Pressed Steel Cage$50.97
Angular Contact Ball Bearing – 50 mm Bore x 80 mm OD x 16 mm Wide, 30° Contact Angle, Open, Pressed Steel Cage$60.45
Angular Contact Bearing - 25 mm ID, 52 mm OD, 15 mm Width, Open, 25° Contact Angle$67.10| MFR / Brand | NSK |
|---|---|
| MPN | 7203C1TRTDTP4 |
| Model | 7203 C 1 TR T DT P4 / 2MM203 WI CR DT / 7203CD |
| Bearing Type | Angular Contact Ball Bearing |
| Base Number | 7203 |
|---|---|
| Industry Terms | spindle bearing, super precision bearing, angular contact ball bearing, tandem matched pair, machine tool bearing, ABEC 7 bearing, duplex set |
| Common Misspellings | NSK 7203 C1TRT DT P4, 7203C1TRTDTP-4, NSK7203C1TRTDTP4, 7203 CTR DT P4, NKS 7203C1TRTDTP4 |
| Application Types | Machine-tool spindles, precision grinders, high-speed motion control, instrument spindles, indexing heads |
| Total Width | 24 mm (0.9449 in) for the tandem pair |
| Bore Shaft Size | 17 mm (0.6693 in) |
| Mpn Variants | 7203C1TRTDTP4, 7203-C1-TR-T-DT-P4, 7203 C1 TR T DT P4, 7203CTRDTP4, 7203C |
| Arrangement Configuration | DT, duplex tandem, factory-matched pair |
| Precision Class | P4 (ABEC 7) |
| Cage Material | Phenolic resin, 120 °C maximum |
| Number Of Rows | 1 per bearing, 2 rows in the tandem set |
| Contact Angle | 15° |
| Mounting Arrangement | Tandem, both bearings facing the same direction |
| Design Units | Metric |
| Bearing Material | Through-hardened bearing steel |
| Part Number | 7203C1TRTDTP4 |
| Cross Reference 1 | RHP 7203CTDTP4 |
|---|---|
| Cross Reference 2 | Timken 2MM203WI CR TUL |
| Cross Reference 3 | 7203C1TRTDTP4 (full carton string including the unverified C1 suffix) |
A tandem-matched pair of super-precision angular contact ball bearings in the 17 mm bore × 40 mm outside diameter × 12 mm width envelope, the ISO 7203 size. Single row each, phenolic cage, ground as a set.
In the NSK super-precision scheme C is a 15° contact angle, distinct from A at 30° and A5 at 25°, so a 7203C and a 7203A5 are different bearings in the same envelope. TR is the outer-ring-guided phenolic cage. DT is duplex tandem, a factory-matched set. P4 is the precision class equivalent to ABEC 7.
In a tandem arrangement both bearings face the same direction, so the two contact-angle lines run parallel and the thrust load divides between them. That gives roughly twice the one-direction thrust capacity of a single bearing. It is the arrangement chosen where thrust in a known single direction is heavy, and it is distinct from a back-to-back or face-to-face pair, which locate a shaft axially in both directions instead.
A tandem set carries radial load together with thrust in one direction only. Axial location in the opposite direction comes from a further bearing opposed to this set.
A 15° contact angle carries more radial load and runs faster than a 25° or 30° bearing of the same size, and carries correspondingly less thrust per row. The phenolic cage is light and self-lubricating, which suits high speed, and is rated to 120 °C, which is the practical ceiling on the arrangement.
2 Pcs. One factory-matched tandem pair, supplied without spacers, locknut or housing. The set is matched as a unit and the two rings are ground together.
The pair goes onto the shaft in the same orientation, with the marked faces aligned as supplied, against a square clean shoulder. Matching is only realised when both outer rings seat fully in the housing bore.
The same-spec equivalents are RHP 7203CTDTP4 and Timken 2MM203WI CR TUL. A 7203 in the same envelope with a different contact angle, cage or arrangement, such as the 7203A5 or a DB-matched pair, is a related size rather than a substitution.
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The international standard behind most of the bearings in your
Belt drives may appear simple, consisting of two wheels and a belt for power transfer.
Tapered, cylindrical, and spherical roller bearings all solve the same basic problem, carrying more load
If you pulled a bearing off general industrial equipment at random, there’s a good chance
Our team can locate, cross-reference, and source all parts.
Our team can locate, cross-reference, and source all parts.
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