Packaging-line bearings are commodity-priced but application-specific, with deep-groove 6200-series, stainless 6000-series, and sealed-for-life 2RS variants dominating conveyor, filler, and labeller duty [S2][S5].
The decision tree starts with the shaft's dn value, ambient contamination, washdown exposure, and whether the line runs a USDA/FDA-contact zone, not with a brand preference [S1][S6].
Three Bearing Families That Cover Most Packaging-Line Duty
Deep-groove 6200-series single-row ball bearings carry the bulk of conveyor-roller and motor-shaft duty in packaging machinery, with 6200-6212 covering the 10-60 mm bore range used on most case erectors and cartoners [S2]. A 6205-2RS at 25 mm bore is a common reference for fractional-horsepower gearmotor output shafts on wrapper in-feed conveyors. Angular-contact 7000-series appears where combined axial/radial load exists, typically on vertical-form-fill-seal (VFFS) film-pull and sealing jaws where thrust load reverses each cycle. Insert bearings (UC-series housed units) dominate belted conveyor idler ends where misalignment of 1-2 degrees is routine. For a broader mechanical context, see the ball bearing reference page.
Stainless variants (AISI 440C rings, AISI 304/316 cage hardware) appear wherever washdown or caustic cleaning chemicals contact the bearing envelope, with food-grade options in the AISI 300-series ring/AISI 316 cage class [S5].
Spec Gates That Decide the Part Number
Shaft speed in dn (mm bore x rpm) is the first gate: below 300,000 dn, any 6200-series 2RS unit is fine; above that, the limiting factor shifts to cage material and lubrication interval, and series like 6200-2RS C3 with polyamide or brass cage become the default [S6]. ABEC-3 is the working tolerance class for packaging-line general duty, with ABEC-5 reserved for high-speed film-feed and labelling heads where runout must stay below roughly 0.0025 mm for label-placement accuracy. Load rating: a typical 6205-2RS carries a dynamic load rating near 14 kN and a static rating near 6.9 kN, which frames the conveyor-idler and motor-shaft envelope.
Seal selection is the second gate. 2RS (rubber seal both sides) blocks particulate washdown but raises breakaway torque; 2Z (metal shield) lowers friction but admits water, a poor fit for the wet zones of a bottle rinser. On packaging lines running IP65+ washdown with daily chemical cleaning, 2RS with a fluorocarbon rubber (FKM) seal is common. Lubrication: food-grade grease (NSF H1 registered, typically aluminium-complex or PFPE thickener) is required in any bearing with incidental product-contact risk, distinct from non-food H2 grease used on upstream conveyor drives.
Material and Lubricant Selection: Matching the Hygiene Zone
Chrome-steel (AISI 52100) rings with pressed-steel or polyamide cages remain the default for dry zones upstream of the filler. Stainless rings (AISI 440C, 60+ HRC after heat treat) become mandatory in the rinse-fill-cap zone where chlorinated water and peroxyacetic acid cleaning agents are present [S5]. For deeper guidance on food-zone material and lubricant gates, see the Food-Grade Ball Bearing Selection: Material, Lubricant, and Seal Gates spec reference.
Grease choice: NSF H1 food-grade grease carries a temperature window roughly -20 to 150 C depending on thickener, with PFPE-based grades extending to about 200 C. In dry, hot zones near heat-seal jaws, a high-drop-point synthetic grease (polyurea or calcium-sulfonate) is the more common pick. Cage material: pressed-steel cages dominate the 6200-series commodity range; brass or phenolic cages appear in higher-speed or higher-temperature applications. Solid polymer (PA66) cages are common in mid-range 2RS units and tolerate continuous operating temperatures up to roughly 120 C.
Comparison of Bearing Options for Packaging-Line Duty
The decision table for the four most-specified packaging-line bearing types looks like this: 6200-series 2RS chrome-steel offers the lowest unit cost (USD 1-10/piece at 1-piece MOQ for general-deep-groove SKUs) and fits dry conveyor/motor-shaft duty [S2]. 6200-series 2RS stainless runs roughly 2-4x the chrome-steel price and is required for washdown and food-contact zones [S5]. Insert/housed UC-series units dominate belted conveyor idlers and tolerate 1-2 degree misalignment without induced load, but add bulk and bracket the bore selection to a narrower range. 7000-series angular-contact bearings carry combined axial/radial load on VFFS film-feed and labeller heads, but require paired mounting (DB or DF) and tighter installation tolerances, pushing rebuild cost higher.
Real Failure Modes and Where the Selection Goes Wrong
The four failure modes that show up on packaging-line bearings are: (1) seal failure from chemical attack, where standard NBR rubber breaks down under peroxyacetic acid or chlorine dioxide cleaning and allows water ingress; (2) grease migration in food-contact zones, where non-H1 grease contaminates the product; (3) cage cracking from under-specified polymer operating above its continuous temperature limit, common on heat-seal-zone bearings; (4) false brinelling on VFFS film-feed idlers sitting static under load between cycles, where vibration at the micro-movement level wears raceway flats in hours. The fix in each case is a spec change, not a lubrication interval, and a reference design engineer working through a ball bearing selection guide will gate the part number on seal compound, grease registration, cage thermal limit, and minimum applied load respectively. [S1]
Sourcing, Standards, and Cost Reality in 2026
Made-in-China B2B platforms list deep-groove 6200-series at FOB USD 1-30 per piece, with single-piece MOQ and diamond-tier factory audit status common; double-row spherical and four-row cylindrical rolling-mill bearings list at USD 270-450 per piece, an order of magnitude above packaging-line duty [S2]. UK and European Master Bearing Distributors stock leading-brand 6200-6300 series with same-week lead time and on-site technical support for failure analysis [S3]. Direct-from-OEM sourcing dominates premium and super-precision miniature bearings, where 5-15 mm bores for labelling-head and encoder-shaft applications carry longer lead times and per-piece pricing from USD 50 upward [S1].
Standards: ISO 15:2017 covers the boundary dimensions of radial ball bearings and is the baseline reference for 6200-6300 interchange. ISO 492 covers radial bearing accuracy classes (ABEC equivalent). For applications with packaging-machine integration context, see the packaging machine and vacuum packaging machine reference pages, which discuss the duty environments these bearings are specified into.
Trackable signals for spec engineers over the next quarter: first, manufacturer revisions to the 6200-2RS family pushed by NSF H1 grease migration testing under extended washdown cycles; second, wider availability of 440C stainless 2RS units at sub-USD 20 price points as Chinese and Indian capacity matures; third, more packaging OEMs publishing application-specific bearing spec sheets on request, replacing the generic 6205-2RS line item that currently dominates spare-parts catalogues. A comparison with industrial gear selection is useful here, because gearmotor output-shaft bearings face the same dn and seal-class gates.