Orbexa Precision Bearings
A large precision bearing ring standing on a pale ground, its ground raceway and brass cage catching a raking light, the left of the frame left clear

Precision rolling bearings · bore 5–140 mm

Precision bearings to P6–P2, measured lot by lot

Angular contact, deep groove, cylindrical, tapered and thrust bearings sorted to ISO P6–P2 and ABEC 3–9. Every lot is measured for radial runout, and that figure goes into the reply.

Kia 2.5 µmInner-ring runout, 30–50 mm bore, P2 — measured per lot, quoted with the reply

Ask for a lot's runout record The nine product families

Ruling figures

Five figures that decide whether the part fits

  • 5–140 mm Bore Catalogue tables; tolerance tables run on to 315–400 mm.
  • 15°–40° Contact angle 15, 18, 20, 25, 30 and 40 degrees; larger angle, higher axial rigidity.
  • 2.5 µm Kia, radial runout ISO 492 limit at P2, bore 18–80 mm.
  • 110 000 Rpm, limiting speed, grease At 5 mm bore, falling to 7 000–11 000 rpm at 110–140 mm.
  • C2–C5 Internal clearance Radial groups to ISO 5753-1; CN carries no suffix.

Standard and catalogue figures. The measured figure for a lot is quoted in the reply, not read off this strip.

Product families

The families, each with its own ruling figures

  1. Precision angular contact ball bearings

    70xx, 72xx, 718xx and 719xx; bore 5–140 mm; single, matched pair and universally matchable sets.

  2. Precision deep groove ball bearings

    For high-speed, low-vibration motors; noise grades Z1–Z4 beside vibration grades V1–V4.

  3. Thin-section ball bearings

    Bore 10–45 mm, for robot joints, gimbals, rotary stages and wafer handling.

  4. Four-point contact ball bearings

    Axial load in both directions through one ring pair; rotary tables and robot joints.

  5. Crossed roller bearings

    Two raceway sets at 90°; radial load, both-direction axial load and overturning moment in one bearing.

  6. Precision cylindrical roller bearings

    Single row for high-speed spindles, double row NN and NNU for lathe spindles; clearance CC9, CC0 and CC1.

  7. Precision tapered roller bearings

    Radial and axial load together; TDO and TDI configurations; metric and inch sizes.

  8. Thrust ball bearings

    Single and double direction, for axial load; not for radial load or high speed.

  9. Ball screw support bearings and spindle units

    60° contact angle, two- to four-row matched sets, factory-set preload, contact lip seals.

What a class covers

A grade constrains the fit. It says nothing about the steel.

An accuracy class sorts a bearing by dimensional tolerance and radial runout. That is the whole of it, so two bearings of the same grade can differ in everything listed here.

  • Load capacity
  • Ball grade
  • Steel cleanliness and hardness
  • Raceway finish
  • Internal clearance
  • Cage material and design
  • Lubrication
  • Noise and vibration

Two P4 bearings can differ on all eight of those, and that is where spindle life is decided.

An automated assembly and inspection bench: a collaborative arm over a rotary parts table, a vision station at the left and a control terminal at the right

Class names

The same grades, four naming systems

ABEC (ABMA 20) ISO 492 DIN 620 JIS B 1514 Typical application
ABEC 1 Normal, Class 0 P0 Class 0 General machinery, fans, pumps, motors
ABEC 3 Class 6 P6 Class 6 Machine tools, low-vibration motors
ABEC 5 Class 5 P5 Class 5 High-speed spindles, precision gearboxes
ABEC 7 Class 4 P4 Class 4 Grinding spindles, precision instruments
ABEC 9 Class 2 P2 Class 2 Ultra-precision spindles, gyroscopes

ABEC numbers rise with precision; ISO, DIN and JIS numbers fall. The tolerance bands are close, not identical, and the ABMA scale stops at ABEC 9.

On file

Certificates and awards, as issued

  • Fig. 1 · QMS Three TÜV SÜD certificates side by side: AS9100D and ISO 9001:2015 on the left, IATF 16949 on the right, both issued to the company named on the scans

    AS9100D · ISO 9001:2015 · IATF 16949 Quality-management scans, shown as issued and unretouched. The holder named on the scans is the operating company that manufactures for this brand — not the brand itself — and the issue and expiry dates printed on the face of each document are the ones that apply.

  • Fig. 2 · 2003 A framed award plaque: China Machinery Industry Science and Technology Award, second prize, 2003, for research into noise reduction in deep groove ball bearings

    China Machinery Industry award, second prize For deep groove ball bearing noise-reduction research. Awarded to the operating company that manufactures for this brand.

  • Fig. 3 · 2006 A gold SINOMACH certificate: China National Machinery Industry Corporation Science and Technology Award, third prize, 2006, for precision ball bearing grinding technology and grinding machine development

    SINOMACH award, third prize For precision ball bearing grinding technology and grinding machine development. Awarded to the operating company that manufactures for this brand.

  • Fig. 4 · 2006 A framed certificate on a radiating gold ground: Machinery Industry Science and Technology Progress Award, second prize, 2006, for an intelligent bearing vibration analyser

    Progress award, second prize For an intelligent bearing vibration analyser. Awarded to the operating company that manufactures for this brand.

Scans are shown as issued and unedited. The manufacturing entity behind the bearing lines is the holder named on them.

Manufacturing

Nine stages from bar stock to a signed inspection record

The nine process stages in order. In-process gauging sits over stages three and four; the vibration gate sits over stage eight. In-process gauging BVT-6 · Z3V3 or above 01 02 03 04 05 06 07 08 09 Bar stock Heat treatment Grinding Superfinishing Stress relief Cleaning Assembly Final inspection Traceability
  1. 01

    Raw material

    Through-hardening GCr15, the same steel as 100Cr6, 52100 and SUJ2.

  2. 02

    Heat treatment

    Controlled atmosphere; 830–850 °C quench, 60–64 HRC in the ring.

  3. 03

    Grinding

    Four operations: face, outside diameter, raceway track, bore.

  4. 04

    Superfinishing

    Finer stones on the raceway, for roughness, friction and noise.

  5. 05

    Stress relief

    A second temper after grinding, to hold the geometry.

  6. 06

    Cleaning

    Ultrasonic washing of rings, balls and cages before assembly.

  7. 07

    Assembly

    Automated lines, with radial clearance held to the drawing.

  8. 08

    Final inspection

    Vibration, noise, clearance and dimensions on every bearing.

  9. 09

    Traceability

    Process and inspection data recorded per lot, retrievable against the box.

Before a quotation

Six questions that come first

Sample lots carry no minimum, and standard sizes are listed from one piece. Lead time is tiered: 1–300 pieces in two days, above that quoted per line.

Ex-stock 2–3 days; a non-stock standard size 6–10 days; 2–6 days from deposit; samples 3–5 days; bulk 5–15 days.

FOB, C&F, CIF, DDU and door-to-door. 30% by T/T with the order and 70% before shipment, or against the bill of lading copy; L/C at sight is accepted.

Plastic bag, colour box, carton and plywood pallet, or tubes and roll pack. Wood carries the IPPC mark, and the anti-corrosion oil data goes with EU shipments.

The manufacturer's certificate of quality, quantity and weight, a certificate of origin, and a packing list with gross and net weights. Under CIF, insurance is at 110% of invoice value.

Sample lead time is 3–5 days and sample orders carry no minimum. Sample cost, and whether it is credited against the first order: on request.

A precision bearing ring photographed in macro on a dark ground, the ground raceway and the chamfer catching a raking light

Request slip

Give us the bore, the grade and the speed

A written answer within two working days, quoting the runout figure actually measured for that lot.

Email the list instead

Four fields is enough to start. Bore, series and running speed are what the measurement needs.