21316 bearing: complete specifications & equivalents
The 21316 is a ISO 15 radial bearing sized 80 x 170 x 39 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Bore diameter d | 80 mm |
| Outer diameter D | 170 mm |
| Width B | 39 mm |
| Seal / shield | open |
| Internal clearance | CN / C3 / C4 available |
| Tolerance class | P0 |
| Cage | steel |
| Operating temperature | -30 to +120 °C |
| Mass (geometry estimate) | 3517 g |
| Standard | ISO 15 |
| Catalog version | iso15-srb-geometry |
| Last verified | 2026-09-24 |
Source: ISO 15 boundary-dimensions standard · extracted 2026-09-24
Standard-interchange bearing: dimensions per ISO 15; CN clearance, P0 tolerance and a stamped-steel cage are catalogue defaults unless the supplier states otherwise, and mass is a geometry-derived estimate. Brand catalogue load ratings and limiting speeds for 21316 are being backfilled — use the inquiry form for certified values.
Dimensions in inches & 21300-series range
| Bore d | 3.15 in |
|---|---|
| Outer diameter D | 6.693 in |
| Width B | 1.535 in |
| ISO bore code | 16 |
| Radial section height (D−d)/2 | 45 mm |
| Smallest bore in 21300-series | 50 mm |
| Largest outer diameter in 21300-series | 240 mm |
| Width range across 21300-series | 27–50 mm |
| Bore position in 21300-series (smallest first) | 7 of 12 |
| Bore above smallest 21300-series size | 30 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 21316 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
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 21316 model number is decoded
In the 21300-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 21316 encode the bore: code 16 = 80 mm (code × 5 from 04 upward). The ISO 15 envelope is 170 mm outside diameter and 39 mm width — 3.15 × 6.693 × 1.535 in, with a 45.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.
Typical equipment & failure modes
Common applications
- paper machine drying cylinders
- large gear drives and mill pinions
- heavy conveyor drum pulleys
- cement and aggregate processing machinery
- mining and aggregate vibrating screens
Known failure patterns
- unloaded-row scuffing when pure thrust exceeds the catalogue axial capacity and one roller row unloads completely
- thermal seizure when an interference shaft fit plus hot running removes all residual radial clearance from a CN bearing
- raceway and roller spalling after the L10 life or from sustained overload and shock in crusher duty
- roller smearing and skid marks when the radial load falls below the minimum load needed to drive the roller set
- cage fatigue and fracture on vibratory screens supplied with normal CN clearance instead of a vibratory C4 fit
Selection pitfalls — read before you substitute
- The large 80 mm-bore 21316 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 39 mm double-row assembly cannot be drifted into position without brinelling.
- The 213 series at 80 mm bore keeps the 39 mm width comparatively narrow for its 170 mm OD; it fits restricted axial space but carries less load than a 22316, so substitution into heavy 223 duty — even at identical bore and OD — will shorten life.
- Before fitting 21316, machine the 80 mm shaft seat and 170 mm housing bore with a relief or small fillet so nothing bridges the bearing chamfer; the 39 mm-wide rings only load correctly when the full faces abut, and a large radius pinches the 45.0 mm radial section.
- On a K tapered bore with adapter sleeve, tighten the KM locknut to drive the 21316 up the sleeve, rotating the inner ring, and stop on residual clearance — measured with feelers at the unloaded rollers — not on torque alone; then lock the tab washer so the 80 mm seat cannot creep.
- Relubricate 21316 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 39 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 80 mm bore starved.
- Choose the bore type deliberately: plain 21316 takes a cylindrical seat, while the K variant has a 1:12 tapered bore and mounts on an adapter sleeve (H3xx series) over a plain commercial shaft or directly on a tapered journal — the two mounting procedures are not interchangeable.
- Order clearance for the mounting method: an interference fit on a rotating inner ring plus thermal growth eats into CN play, so most industrial 80 mm-bore mounts use C3, vibrating screens use C4, and CN is mainly for loose/split-housing fits — the designation suffix states the class.
Frequently asked questions
What are the dimensions of a 21316 spherical roller bearing?
A 21316 double-row spherical roller bearing per ISO 15 has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), a 45.0 mm radial section and roughly 3517 g geometry-based estimated mass; catalogue masses vary with cage and design.
How does the 21316 bore code work?
The leading 2 in 21316 denotes a double-row spherical roller, the middle digits give the ISO 15 dimension series, and the last two digits are bore code 16: 16 × 5 = 80 mm. The 170 mm OD and 39 mm width come from the dimension series (21300), not from the bore code alone.
How much misalignment can a 21316 accommodate?
Thanks to the sphered outer ring raceway, 21316 normally accommodates angular misalignment of around 1° under load (up to about 2° in favourable, lightly loaded conditions); the permissible value is smaller under full load and depends on clearance and cage design, so check the catalogue figure for the actual duty.
What is the difference between 21316 and 21316K?
The plain 21316 has a cylindrical bore for a straight shaft seat. The K suffix denotes a 1:12 tapered bore, normally mounted on an H3xx adapter sleeve over a commercial shaft (or directly on a tapered journal); the bearing is driven up the sleeve to a specified residual clearance and locked with a KM nut and tab washer.
Should the 21316 be ordered with CN, C3 or C4 clearance?
Use C3 as the usual default when the rotating inner ring has an interference fit, because the fit plus thermal expansion reduces residual play; choose C4 (often with a vibratory cage design) for screens and feeders; order CN mainly for loose fits on stationary shafts or split housings. A W33 outer-ring lubrication groove is a separate, commonly combined option.
Reviewed & verified by the MPN Base engineering desk against source catalog iso15-srb-geometry on 2026-09-24. Read our editorial & correction policy.