6330-ZZ bearing: complete specifications & equivalents
The 6330-ZZ is a ISO 15 radial bearing sized 150 x 320 x 65 mm (bore x OD x width) with ZZ sealing. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NSK |
| Bore diameter d | 150 mm |
| Outer diameter D | 320 mm |
| Width B | 65 mm |
| Material | GCr15 |
| Seal / shield | ZZ |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 300 kN |
| Basic static load rating C0 | 284 kN |
| Mass | 22700 g |
| Manufacturer designation | NSK 6330ZZ |
| Standard | ISO 15 |
| Catalog version | NSK Rolling Bearings E1103 Part C |
| Last verified | 2026-09-24 |
Source: catalog reference (NSK Rolling Bearings E1103 Part C) · extracted 2026-09-24
Dimensions in inches & 6300-series range
| Bore d | 5.906 in |
|---|---|
| Outer diameter D | 12.598 in |
| Width B | 2.559 in |
| ISO bore code | 30 |
| Radial section height (D−d)/2 | 85 mm |
| Smallest bore in 6300-series | 10 mm |
| Largest outer diameter in 6300-series | 500 mm |
| Width range across 6300-series | 11–95 mm |
| Bore position in 6300-series (smallest first) | 27 of 34 |
| Bore above smallest 6300-series size | 140 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6330 | ISO-INTERCHANGE | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | ISO 15 envelope interchange; NSK suffix ZZ maps to industry-neutral ZZ. Verify seal design, grease and speed rating per brand catalogue. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 6330-ZZ model number is decoded
In the 6300-series (ISO 15 diameter series 3) the last two digits encode the bore: 6330 carries bore code 30 = 150 mm. Outside diameter 320 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.
Typical equipment & failure modes
Common applications
- heavy conveyors
- pulp and paper machinery
- medium and heavy industrial drives
- large gearboxes
Known failure patterns
- fine-particle abrasion when non-contact shields let dust past in dirty duty
- grease aging in the shield-for-life cavity with no relubrication path
- fretting corrosion on a loose shaft seat
- cage damage from operation beyond the limiting speed
Selection pitfalls — read before you substitute
- Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.
- The 63xx medium series gains rating at 150 mm bore through a 320 mm OD and 65 mm width; the heavier rolling elements also trade away some speed versus a 6230.
- ZZ shields are non-contact: 6330-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6330-2RS for that.
- Shielded 6330-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.
- Suffixes stack in a defined order — clearance follows the seal code, e.g. 6330-C3. No clearance suffix means normal CN clearance.
- NSK catalogues the shielded version as 6330ZZ — suffix ZZ, two non-contact steel shields; the industry-neutral page spelling is -ZZ. Quote the NSK designation when ordering.
- The 300/284 kN ratings, mass 22700 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6330ZZ; this seal/size combination has no counterpart in the SKF 17000 extract used elsewhere on this site, so the page rests on a single manufacturer source — internal geometry and ratings legitimately differ between brands, so re-verify before substituting in a rated drive.
Frequently asked questions
What are the dimensions of a 6330-ZZ bearing?
A 6330-ZZ deep-groove ball bearing has a 150 mm bore, 320 mm outer diameter and 65 mm width (5.906 × 12.598 × 2.559 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields.
How does the 6330 bore code work?
The last two digits of 6330 are bore code 30, giving 30 × 5 = 150 mm bore. The 320 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone.
What does the ZZ suffix on 6330-ZZ mean?
ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing.
How does the 6300 compare with other series at the same 150 mm bore?
The '3' is the medium diameter series: 320×65 mm, 85.0 mm radial section at 150 mm bore, carrying more load than a 6230 but needing a larger housing bore and giving up some speed.
What is the NSK designation and catalogue data for 6330-ZZ?
In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6330ZZ — two non-contact steel shields (NSK suffix ZZ), 150×320×65 mm per ISO 15. Quoted values: C 300 kN, C0 284 kN, mass 22700 g. The industry-neutral page spelling 6330-ZZ follows the seal-suffix convention used across this site, not NSK order-number spelling. Reference and limiting speeds are not tabulated in the E1103 dimension tables used here; consult NSK speed tables before high-speed service.
Reviewed & verified by the MPN Base engineering desk against source catalog NSK Rolling Bearings E1103 Part C on 2026-09-24. Read our editorial & correction policy.