6248 bearing: complete specifications & equivalents
The 6248 is a ISO 15 radial bearing sized 240 x 440 x 72 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NSK |
| Bore diameter d | 240 mm |
| Outer diameter D | 440 mm |
| Width B | 72 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 375 kN |
| Basic static load rating C0 | 430 kN |
| Mass | 50500 g |
| Manufacturer designation | NSK 6248 |
| 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 & 6200-series range
| Bore d | 9.449 in |
|---|---|
| Outer diameter D | 17.323 in |
| Width B | 2.835 in |
| ISO bore code | 48 |
| Radial section height (D−d)/2 | 100 mm |
| Smallest bore in 6200-series | 10 mm |
| Largest outer diameter in 6200-series | 440 mm |
| Width range across 6200-series | 9–72 mm |
| Bore position in 6200-series (smallest first) | 34 of 34 |
| Bore above smallest 6200-series size | 230 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6248 | ISO-INTERCHANGE | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension interchange; ratings above are NSK E1103 values and differ by brand — verify per supplier. |
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 6248 model number is decoded
In the 6200-series (ISO 15 diameter series 2) the last two digits encode the bore: 6248 carries bore code 48 = 240 mm. Outside diameter 440 mm and width 72 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 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
- industrial fans and blowers
- hoists and winches
- heavy conveyors
- pulp and paper machinery
Known failure patterns
- contamination wear from dust and dirt ingress through the open arrangement
- lubricant starvation when no regreasing interval is maintained
- brinelling from static overload or hammering during mounting
- false brinelling from vibration while the shaft is stationary
Selection pitfalls — read before you substitute
- Mount this 240 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 62xx light series is the default general-purpose section at 240 mm bore; before upgrading to a 6348 for extra capacity, confirm the housing accepts a 440 mm OD and 72 mm width — it is not a drop-in swap.
- The open 6248 has no lubricant retention: grease escapes and contaminants migrate straight into the 240×440×72 mm raceway, so specify a sealed arrangement for dusty or washdown duty.
- Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6248 units.
- Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.
- The open 6248 needs external sealing and application-supplied lubrication; in the NSK catalogue the protected variants are separate order numbers with suffixes ZZ (shields), VV (non-contact rubber seals) and DDU (contact rubber seals).
- The 375/430 kN ratings, mass 50500 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6248; 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 6248 bearing?
A 6248 deep-groove ball bearing has a 240 mm bore, 440 mm outer diameter and 72 mm width (9.449 × 17.323 × 2.835 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields.
How does the 6248 bore code work?
The last two digits of 6248 are bore code 48, giving 48 × 5 = 240 mm bore. The 440 mm outside diameter and 72 mm width follow the ISO 15 diameter series, not the bore code alone.
What does no suffix on 6248 mean?
A bare 6248 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication.
How does the 6200 compare with other series at the same 240 mm bore?
The '2' is the light diameter series: 440×72 mm with a 100.0 mm radial section at 240 mm bore. A 6348 on the same bore is larger and higher-rated; a 6048 is smaller and lower-rated.
What is the NSK designation and catalogue data for 6248?
In the NSK Rolling Bearings catalogue (E1103 Part C) this size is listed as 6248 — the open (unsealed) execution, 240×440×72 mm per ISO 15. Quoted values: C 375 kN, C0 430 kN, mass 50500 g. The industry-neutral page spelling 6248 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.