RHP7003ETDULP4Super Precision Angular Contact Ball Bearing Pair 17 x 35 x 10 mm 25° ABEC 7 Light Preload

Product Description

What this part is

A duplex-ground matched pair of single-row super-precision angular contact ball bearings, each 17 mm bore, 35 mm outside diameter, 10 mm width. The two rings are ground together as a set to a 25 degree contact angle and a light preload band, and the pair mounts as one unit with 20 mm of total width when clamped face to face.

Decoding the designation

70 is the single-row angular contact ball bearing, ISO dimension series 70. 03 is the bore code for a 17 mm bore. E is a 25 degree contact angle in the RHP and Timken scheme. T is a machined phenolic laminate cage. DU is duplex universal, two bearings ground as a set. L is the light preload grade. P4 is ABEC 7, ISO class 4 super-precision tolerance.

What these specs mean in practice

The 25 degree contact angle is the thrust-biased option in this family: axial capacity and axial stiffness rise with contact angle, so a 25 degree pair holds a spindle’s axial position harder under cutting thrust than the 15 degree version of the same envelope, at the cost of a lower speed limit and higher operating temperature at the same duty. Light preload trades stiffness for heat, giving the least heat generation of the preload grades, which is why light-preload duplex sets serve fast, moderately loaded spindles and grinding heads. P4 tolerances hold bore, outside diameter, width and running accuracy to ABEC 7 limits, and duplex grinding converts those tolerances directly into the light preload when the pair is clamped solid.

Published specifications

Dynamic Load Rating: 7.8 kN (1,754 lbf). Static Load Rating: 4.3 kN (967 lbf). Limiting Speed: 63,000 rpm. Total width, pair clamped: 20 mm. Tolerance class: P4 (ABEC 7, ISO class 4). Closure: open, both faces.

Quantity and configuration

Matched pair, 2 Pcs, duplex ground as one set.

Interchange guidance

7003E is the RHP designation for the 25 degree version of this envelope; 7003X3TDULEP7 is the alternate RHP form carried on cartons for the same pair. Same-envelope bearings with a different contact angle, preload grade or tolerance class — 7003C at 15 degrees, the medium- and heavy-preload sets, and P0 or P2 class variants — are related sizes rather than equivalents. A single universally ground bearing in the same size is a different item, since SU pieces are not ground to this pair’s stack height.