718 Series
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Photo is a representative angular contact cutaway; thin-section rings are lower in cross-section than the photo suggests.
71808C Thin-Section Angular Contact Ball Bearing
Thin-section angular contact ball bearing · brand NCWY
71808C
d40mm
D52mm
B7mm
Mass, approx.40 g
- Open / ZZ / 2RS / 2RZ closures
- P0 / P6 / P5 precision · C0–C5 clearance
- Noise grades ZV1–ZV4 / EMQ
Overview
71808C is a thin-section angular contact ball bearing with a 40 mm bore, 52 mm outer diameter and 7 mm width, part of the 718 Series family. Boundary dimensions follow GB/T 292 / ISO 15 for angular contact ball bearings and are cross-checked against the catalogue dimension tables.
The 718 Series is a thin-section angular contact line for compact high-speed spindles, instruments and robotics joints. Low cross-section keeps housings small; P4 / P5 precision and matched pairs are the usual ask. Contact angle C (15°) listed; AC / B on request. Closure options: Open. Supplied in precision grades P5/P4/P6. Typical applications include high-speed spindles, precision instruments, robotics joints, compact gearboxes.
718 thin-section angular contact. Suffix C = 15° contact angle; AC (25°) and B (40°) available on request. Usually used in matched pairs (DB/DF/DT). Datasheet on request.
- Closure options: Open — open, metal shield or rubber seal to suit dust and grease retention.
- Precision P5, P4, P6; clearance C0, C2, C3; noise grades ZV1, ZV2, ZV3.
- GCr15 chrome steel (100Cr6), 58–62 HRC; steel or nylon cage options.
- Stainless rings, ceramic balls and non-standard sizes can all be ordered to drawing; black chamfer, chamfer colour, custom grease and customer marking also available on request.
Boundary dimensions
| Model | 71808C | Series | 718 Series |
|---|---|---|---|
| Bore diameter d | 40 mm | Outer diameter D | 52 mm |
| Width B | 7 mm | Chamfer r min | 0.3 mm |
| Mass, approx. | 40 g | Closure options | Open |
| Precision grades | P5 · P4 · P6 | Radial clearance | C0 · C2 · C3 |
| Noise grades | ZV1 · ZV2 · ZV3 | Cage | Steel · Nylon · Phenolic (on request) |
| Ring material | GCr15 chrome steel (100Cr6), 58–62 HRC | MOQ | 2,000 pcs standard models (trial orders negotiable; samples available) |
| Lead time | 7–25 days for standard models; 30–50 days for special or custom orders | Packing | Plastic tube · Single box + plastic bag · VCI anti-rust paper · Export carton · OEM packaging and labels |
| Ports | Ningbo / Shanghai | Payment | T/T 30% in advance, balance against B/L copy; L/C at sight |
Dimensions in millimetres. Mass is approximate and depends on closure, cage and grease. Load ratings and limiting speeds are available on request.
Variants and customisation
The base model can be supplied in the closures, tolerances and noise grades below. Anything outside this list is quoted on drawing.
Closure options
Open
Precision grades
P5P4P6
Radial clearance
C0C2C3
Noise grades
ZV1ZV2ZV3
Cage
SteelNylonPhenolic (on request)
Customisation
Matched pairs DB/DF/DTContact angle C/AC/BCustom greaseCeramic ballsCustom marking
Typical applications
Typical uses for this family. Send the application and we will advise on closure, clearance and grease.
Quality & documentation
Noise and vibration graded in-house; SGS RoHS test report available for compliance files. ISO 9001, CE, SASO and PVOC documents on request.
Boundary dimensionsGB/T 292 · ISO 15
Noise & vibrationZV1–ZV4 · EMQ
SGS RoHS reportSHAEC1610052101
Related
Related bearings
Same series or nearby boundary dimensions.
