6320-RSR bearing: complete specifications & equivalents

Specification table

Source: catalog reference (NSK Rolling Bearings E1103 Part C) · extracted 2026-09-24

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 6320-RSR model number is decoded

In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6320VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Large bores like the 100 mm of 6320-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.
• The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.
• RSR low-friction seals on 6320-RSR run faster than contact-seal 6320-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6320-2RS instead.
• The non-contact lip of 6320-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.
• Suffixes stack in a defined order — clearance follows the seal code, e.g. 6320-C3. No clearance suffix means normal CN clearance.
• The housing bore for the 215 mm OD should be round within IT7; an oval bore pinches the outer ring of 6320-RSR and shows up later as two-point loaded raceway wear.
• NSK catalogues this low-friction non-contact seal as 6320VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).
• At 100 mm bore 6320 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.
• NSK rates 6320 at 191 kN dynamic (C) and 141 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.
• At 7040 g (7.0 kg), 6320 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.
• The 100×215×47 mm envelope of 6320 gives a D/d ratio of 2.15 and 57.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.
• The 191/141 kN load ratings, mass 7040 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6320VV on the 100×215×47 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6320 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.
• NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.
• When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6320 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.