30309 Bearing Dimensions

Tolerances and fits for 30309

FULI makes 30309 to P0 as standard, with P6 on request. P0 is the Normal tolerance class of ISO 492; P6 limits are tighter. These are the P0 limits for the 45 × 100 × 27.25 mm size.

Δdmp and ΔDmp: deviation of the mean bore and mean outside diameter in one radial plane. ΔTs: assembled width of cone and cup, from the ISO 492 table for metric tapered roller bearings. Cone width B and cup width C: 0 / −120 µm each.

Shaft and housing fits (general guidance)

For an inner ring that turns with a solid steel shaft under normal load, bearing makers’ fit tables give 45 m5 for the shaft of 30309. The cup usually sits in an H7 or J7 housing bore so that it can be moved when the pair is adjusted.

Taking the loosest and the tightest combination of limits, a P0 30309 on a 45 mm m5 shaft has 9 to 32 µm interference. Its cup has 0 to 53 µm clearance in an H7 bore and 13 µm interference to 40 µm clearance in a J7 bore.

This is general guidance, not a FULI specification. Heavy or shock loads, a hollow shaft, a thin-walled, split or light-alloy housing, or a large temperature difference between shaft and housing call for other classes, and the drawing of your machine takes priority.

If the outer ring turns and the shaft stands still, as in an idler pulley or a wheel hub, the fits are reversed: the housing gets the interference fit (for example N7 or P7) and the shaft a sliding one (g6 or h6).

Sources: ISO 492 tables as printed in the NTN catalogue CAT. No. 2203/E (Tables 6.4 and 6.5) and the RKB tolerance catalogue; ISO 286-2 for the seats; SKF and NTN fit tables for the shaft and housing classes.

30309 compared with nearby sizes

30309 measures 45 × 100 × 27.25 mm: bore d, outside diameter D and total width T. Other tapered roller bearings on this site for the same 45 mm shaft are 32009 (45 × 75 × 20 mm), 33109 (45 × 80 × 26 mm), 30209 (45 × 85 × 20.75 mm), 32209 (45 × 85 × 24.75 mm) and 32309 (45 × 100 × 38.25 mm).

32309 is the next heavier choice for a 45 mm shaft, with the same 100 mm outside diameter and 11 mm more width (38.25 mm). In FULI's catalog 32309 has a dynamic load rating of 145.3 kN against 108.90 kN and a weight of about 1.41 kg against 0.987 kg for 30309.

32209 is the lighter option on the same shaft, with an outside diameter 15 mm smaller (85 mm) and 2.5 mm less width (24.75 mm), for housings with less room. In FULI's catalog 32209 has a dynamic load rating of 80.70 kN against 108.90 kN and a weight of about 0.573 kg against 0.987 kg for 30309.

30211 has the same 100 mm outside diameter with a 55 mm bore, so it fits the same housing bore on a larger shaft.

32211 has the same 100 mm outside diameter with a 55 mm bore, so it fits the same housing bore on a larger shaft.

In the 303 series the sizes either side of 30309 are 30308 for a 40 mm shaft and 30310 for a 50 mm shaft.

Cr and weight from FULI's catalog; — = not listed on this site.

30309 weight, load ratings and speed

FULI's catalog gives the weight of 30309 as about 0.987 kg, so 100 bearings weigh about 98.7 kg and 1,000 about 987 kg before packing. The weight is for the cone and cup together.

30309 has a dynamic load rating Cr of 108.90 kN and a static load rating C0r of 129.80 kN. Cr is the load used to work out rating life; C0r is the reference for loads carried while the bearing is stationary or turning slowly.

Values from FULI's catalog; confirm for your application.

30309 cone and cup

30309 is supplied as a complete bearing: the cone (inner ring with rollers and cage) and the cup (outer ring). The total width T of 27.25 mm applies when the two are assembled; the cone and the cup on their own are each narrower. Tell us if you need only the cone or only the cup.

Tapered roller bearings carry radial load and axial load in one direction, so 30309 is normally mounted as one of a pair facing each other, and the end play or preload is set when the pair is adjusted on the shaft. That is why FULI lists the clearance as set during mounting, not as a C-class value.

30309 dimensions in inches

The nearest common inch shaft size to the 45 mm bore of 30309 is 1-3/4 in (44.45 mm), 0.55 mm smaller than the bore, so 30309 would be loose on it. Inch shafts need an inch bearing, not a metric one with a sleeve or shim.

Converted at 1 in = 25.4 mm and rounded to four decimals. The bearing itself is made to the millimetre sizes.

Grease for 30309

FULI supplies tapered roller bearings rust-protected and normally without grease; grease is added when 30309 is mounted. Relubricating 30309 from the side takes about 13.6 g each time by the formula in our grease calculator: 0.005 × D × T = 0.005 × 100 × 27.25.

How FULI supplies 30309

The standard 30309 from FULI has GCr15 chrome steel rings and rollers and P0 precision, with P6 on request. Where an order states a requirement for the total width T (27.25 mm for 30309) or the cone height, each set is checked on a height gauge.

Rings are marked with a brand you are authorised to use, with the FULI brand, or left neutral, as your order states. The box is printed with the model, precision class and brand.

Inquiries that leave out the prefix or suffix letters are the usual cause of a wrong quote, so write the full designation, for example 30309.

Tools and guides for 30309

• Bearing size finder: look up a size from bore, OD and width
• Bearing weight chart
• Bearing grease fill calculator
• Shaft and housing tolerance chart
• Tapered roller bearing number lookup
• Bearing lubrication basics
• Ball bearing vs roller bearing
• How to choose wheel hub bearings
• All bearing products and model pages