16004 bearing: complete specifications & equivalents
The 16004 is a ISO 15 radial bearing sized 20 x 42 x 8 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | FAG |
| Bore diameter d | 20 mm |
| Outer diameter D | 42 mm |
| Width B | 8 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 7.91 kN |
| Basic static load rating C0 | 4.48 kN |
| Reference speed (thermal) | 13800 rpm |
| Limiting speed (mechanical) | 26000 rpm |
| Mass | 48 g |
| Manufacturer designation | FAG 16004 |
| Standard | ISO 15 |
| Catalog version | HR 1 Rolling Bearings (Jan 2020) |
| Last verified | 2026-09-25 |
Source: catalog reference (HR 1 Rolling Bearings (Jan 2020)) · extracted 2026-09-25
Parameters extracted from the official FAG Rolling Bearings catalogue (HR 1 Rolling Bearings (Jan 2020)); FAG® is a trademark of Schaeffler Technologies AG & Co. KG, used here for identification only — mpnbase is not an authorized FAG/Schaeffler distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at schaeffler.com.
Dimensions in inches & 16000-series range
| Bore d | 0.787 in |
|---|---|
| Outer diameter D | 1.654 in |
| Width B | 0.315 in |
| ISO bore code | 04 |
| Radial section height (D−d)/2 | 11 mm |
| Smallest bore in 16000-series | 12 mm |
| Largest outer diameter in 16000-series | 540 mm |
| Width range across 16000-series | 7–57 mm |
| Bore position in 16000-series (smallest first) | 4 of 38 |
| Bore above smallest 16000-series size | 8 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 16004 | ISO-INTERCHANGE | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension interchange; ratings above are FAG HR 1 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 16004 model number is decoded
In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 8 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 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. FAG catalogue order number: 16004.
Typical equipment & failure modes
Common applications
- small gearboxes
- conveyors and drives
- agricultural equipment
- fans and blowers
Known failure patterns
- contamination wear from dust and dirt ingress through the open arrangement
- lubricant starvation when no regreasing interval is maintained
- fretting corrosion on a loose shaft seat
- cage damage from operation beyond the limiting speed
Selection pitfalls — read before you substitute
- At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 16004; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.
- The 160xx narrow section at 20 mm bore shares the 42 mm outside diameter of the 6004 but is only 8 mm wide; a 6004 in an 8 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.
- The open 16004 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×42×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.
- Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16004 units.
- Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.
- The open 16004 has no integral sealing; in the FAG catalogue the protected variants carry suffixes -2Z (shields), -2RSR (contact seals) and, on Generation-C sizes, -2HRS (high-precision contact seals). The -C suffix marks FAG's Generation-C internal design, not a seal.
Frequently asked questions
What are the dimensions of a 16004 bearing?
A 16004 deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 8 mm width (0.787 × 1.654 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields.
How does the 16004 bore code work?
The last two digits of 16004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 8 mm width follow the ISO 15 diameter series, not the bore code alone.
What does no suffix on 16004 mean?
A bare 16004 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 16000 compare with other series at the same 20 mm bore?
160 is the narrow extra-light section: 42×8 mm with an 11.0 mm radial section at 20 mm bore. It has the same bore and outside diameter as the 6004 but a narrower ring, so the two are not width-interchangeable; in the catalogues used on this site it appears in the FAG HR 1 range.
What is the FAG designation and catalogue data for 16004?
In the Schaeffler FAG Rolling Bearings catalogue (HR 1, Jan 2020) this size is listed as 16004 — the open (unsealed) execution, 20×42×8 mm per ISO 15. Quoted values: C 7.91 kN, C0 4.48 kN, mass 48 g. Limiting speed 26000 rpm, reference speed 13800 rpm. The industry-neutral page spelling 16004 follows the seal-suffix convention used across this site, not FAG order-number spelling.
Reviewed & verified by the MPN Base engineering desk against source catalog HR 1 Rolling Bearings (Jan 2020) on 2026-09-25. Read our editorial & correction policy.