21314 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 21314 model number is decoded

Ordering number 21314 E in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 70 mm shaft, dimension series 13 (heavy OD, normal width), with open execution and a stamped window-type steel cage. Reading the designation: the leading 2 marks a spherical roller bearing, the 13 is the ISO 15 dimension series (dimension series 13 (heavy OD, normal width)), and the last two digits encode the 70 mm bore; the 150 mm OD and 35 mm width follow the ISO 15 general plan. 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. With C 291 kN and C0 325 kN, the 21314 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 35 mm width across two roller rows needs the full charge.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Mount the 70 mm bore 21314 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 70 mm bore (150×35 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.
• Catalogue reference speed and limiting speed are different limits: the 4,000 r/min reference is a thermal criterion under load, while the 5,600 r/min limiting value is the mechanical ceiling — observe both.
• The 21314 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 291/325 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.
• The 291/325 kN ratings are SKF catalogue values for this exact execution (21314 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 21314 (cylindrical bore as listed, tapered-bore 21314 EK variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21314 E designation when purchasing.