Precision Bearing Tolerance Manual CXE Bearing: Full Specification ISO 492 / GB/T 307.1 Precision Standards
All values in micrometers (μm)
1. Class 0 (Normal Class) Precision Standards
Table 1: Inner Ring (Class 0) - Full Data
Bore d (mm) Δdmp Vdp Vdmp Kia ΔBs VBs
Over Up to High Low Max Max Radial Runout High Low Width Var.
2.5 10 0 -8 10 6 10 0 -120 15
10 18 0 -8 10 6 10 0 -120 20
18 30 0 -10 13 8 13 0 -120 20
30 50 0 -12 15 9 15 0 -120 20
50 80 0 -15 19 11 20 0 -150 25
80 120 0 -20 25 15 25 0 -200 25
120 180 0 -25 31 19 30 0 -250 30
180 250 0 -30 38 23 40 0 -300 30
250 315 0 -35 44 26 50 0 -350 35
Table 2: Outer Ring (Class 0) - Full Data
Outer Dia. D (mm) ΔDmp VDp (Open) VDmp Kea
Over Up to High Low Max Max Radial Runout
18 30 0 -9 12 7 15
30 50 0 -11 14 8 20
50 80 0 -13 16 10 25
80 120 0 -15 19 11 35
120 150 0 -18 23 14 40
150 180 0 -25 31 19 45
180 250 0 -30 38 23 50
250 315 0 -35 44 26 60
2. Class 6 (P6) Precision Standards
Table 3: Inner Ring (Class 6) - Full Data
Bore d (mm) Δdmp Vdp Vdmp Kia ΔBs
Over Up to High Low Max Max Max High Low
2.5 10 0 -7 9 5 6 0 -120
10 18 0 -7 9 5 7 0 -120
18 30 0 -8 10 6 8 0 -120
30 50 0 -10 13 8 10 0 -120
50 80 0 -12 15 9 10 0 -150
80 120 0 -15 19 11 13 0 -200
120 180 0 -18 23 14 18 0 -250
180 250 0 -22 28 17 20 0 -300
3. Class 5 (P5) Precision Standards
Table 5: Inner Ring (Class 5) - Full Data
Bore d (mm) Δdmp Vdp Vdmp Kia Sd Sia ΔBs
Over Up to High Low Max Max Max Max Max High Low
2.5 10 0 -5 4 3 4 7 7 0 -40
10 18 0 -5 4 3 4 7 7 0 -80
18 30 0 -6 5 3 4 8 8 0 -120
30 50 0 -8 6 4 5 8 8 0 -120
50 80 0 -9 7 5 5 8 8 0 -150
80 120 0 -10 8 5 6 9 9 0 -200
120 180 0 -13 10 7 8 10 10 0 -250
4. Ultra-Precision (P4 & P2) Standards
Table 7-10: P4 & P2 Precision Limits (Extract)
Bore/Outer (mm) Δdmp / ΔDmp Class 4 (P4) Max Class 2 (P2) Max
Over Up to High Low Kia/Kea Sia/Sea Kia/Kea Sia/Sea
18 30 0 -6 / -2.5 3 / 4 3 / 4 1.5 / 2.5 1.5 / 2.5
30 50 0 -8 / -2.5 4 / 5 4 / 5 1.5 / 2.5 1.5 / 2.5
50 80 0 -9 / -4.0 4 / 5 4 / 5 1.5 / 4.0 1.5 / 4.0
80 120 0 -10 / -5.0 5 / 6 5 / 6 2.5 / 5.0 2.5 / 5.0
Technical Terminology
Δdmp / ΔDmp: Single plane mean bore/outside diameter deviation. Kia / Kea: Radial runout of assembled bearing inner/outer ring. Sia / Sea: Axial runout of assembled bearing inner/outer ring. Sd / SD: Side face runout with reference to the bore/outside surface. V-Rating: Vibration velocity standards (V1, V2, V3). CXE Bearing specializes in V-rated bearings for low-noise applications.