21316 bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings) · extracted 2026-09-26

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.

Cross references & equivalents

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

The 21316 E is a 80×170×39 mm spherical roller bearing — the dimension series 13 (heavy OD, normal width) entry for a 80 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Numbering ties the bearing to its envelope: 21316 means spherical-roller type, dimension series 13, 80 mm bore — which is why the 170×39 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The trailing E is the SKF optimized internal design: larger rollers and a stamped window-type steel cage give higher load ratings than the older CC geometry; EK is the same bearing with a 1:12 tapered bore for adapter sleeves. Selection arithmetic: the C0/C ratio is about 1.13 (static 375 kN against dynamic 331 kN), typical of a spherical roller sized for heavy combined loads, and the 39 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 80 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Mount the 80 mm bore 21316 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.
• The 21300-series series at 80 mm bore (170×39 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.
• The 21316 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 331/375 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.
• The 4450 g mass and 39 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 21316.
• The 331/375 kN ratings are SKF catalogue values for this exact execution (21316 E); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.
• SKF lists several executions of 21316 (cylindrical bore as listed, tapered-bore 21316 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21316 E designation when purchasing.