31300 Series Tapered Roller Bearings – Metric, Higher Load at Same Envelope as 30300
GBC-supplied 31300 series metric tapered roller bearings, 31305 to 31315, d 25–75 mm. Same D as 30300 series, higher load ratings. ISO 355 / DIN 720
MOQ: 50 pcs. Minimum order value USD 1,500; mixed orders and trial quantities welcome.
METRIC TAPERED ROLLER BEARINGS — 31300 SERIES
Series Overview
The 31300 series (313xx) covers bore diameters from 25 mm to 75 mm and shares the same outer diameter as the 30300 series, but delivers higher load ratings through a larger roller complement. Existing housings require no modification when upgrading from 30300 to 31300.
All 11 models conform to ISO 355 and DIN 720 standards. Supplied by GBC, MOQ 100 pieces.
Key Design Features
Higher load at same outer envelope
Same D as 30300 series but higher load ratings — no housing modification when upgrading.
ISO 355 / DIN 720 compliant
Full dimensional compliance ensures interchangeability with SKF, FAG, NSK and Koyo 31300 equivalents.
Drop-in upgrade from 30300
Same outer diameter as 30300 means no housing modification when upgrading.
11 sizes — d 25 to d 75 mm
Covers the most common medium-duty shaft sizes, dynamic load ratings up to 218,000 N.
Boundary dimensions: d bore · D outer diameter · T / B width (mm)
Complete Specification Table
Dimensions in mm · Load ratings in N · Weight in kg
31305 to 31315 — d 25–75 mm
| Bearing No. | d | D | T | Dynamic (N) | Static (N) | Weight (kg) |
|---|---|---|---|---|---|---|
| 31305 | 25 | 62 | 18.250 | 40,700 | 46,000 | 0.264 |
| 31306 | 30 | 72 | 20.750 | 47,300 | 50,000 | 0.396 |
| 31307 | 35 | 80 | 22.750 | 61,600 | 67,000 | 0.518 |
| 31308 | 40 | 90 | 25.250 | 81,000 | 96,000 | 0.727 |
| 31309 | 45 | 100 | 27.250 | 91,000 | 102,000 | 0.947 |
| 31310 | 50 | 110 | 29.250 | 106,000 | 120,000 | 1.220 |
| 31311 | 55 | 120 | 31.500 | 130,000 | 158,000 | 1.560 |
| 31312 | 60 | 130 | 33.500 | 145,000 | 176,000 | 1.910 |
| 31313 | 65 | 140 | 36.000 | 165,000 | 202,000 | 2.390 |
| 31314 | 70 | 150 | 38.000 | 218,000 | 274,000 | 2.950 |
| 31315 | 75 | 160 | 40.000 | 209,000 | 245,000 | 3.390 |
Typical Applications
The 31300 series is chosen when a 30300 is the right size but the load rating needs to be higher.
Uprated gearboxes
Speed reducers upgraded from 30300 for higher torque, mixer drives with increased output
Conveyor and material handling
Drive pulley shafts and screw conveyor end bearings with elevated combined loads
Agricultural machinery
Higher-load tractor transmission positions, combine harvester intermediate drive shafts
Medium pump drives
Centrifugal and positive displacement pump shafts under higher combined loading
Need 31300 series bearings?
Contact us for pricing across 31305–31315. We can advise on 30300 vs 31300 selection for your load requirements.
GBC-supplied 31300 series metric tapered roller bearings, 31305 to 31315, d 25–75 mm. Same D as 30300 series, higher load ratings. ISO 355 / DIN 720
MOQ: 50 pcs. Minimum order value USD 1,500; mixed orders and trial quantities welcome.
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