Tapered Roller Bearings
30311 Tapered Roller Bearing
55 × 120 × 31.5 mm
30311 is a tapered roller bearing from the 303 series with a 55 mm bore, a 120 mm outside diameter and a 31.5 mm overall width. It has a dynamic load rating of 139,500 N and a static load rating of 161,100 N and a speed rating of 3,960 rpm (oil lubrication), weighing about 1.66 kg. The radial cross-section (D − d) is 65 mm.
Brands: NTN, FAG, SKF, NBC, DTC, SLS
30311 Specifications
| Bearing No. | 30311 |
|---|---|
| d (Bore) | 55 mm |
| D (Outer Dia.) | 120 mm |
| T (Overall Width) | 31.5 mm |
| B (Cone Width) | 29 mm |
| C (Cup Width) | 25 mm |
| Dynamic Load | 139,500 N |
| Static Load | 161,100 N |
| Max. RPM | 3,960 |
| Weight | 1.66 kg |
| Series | 303 Series Single Row Tapered Roller Bearings |
30311 Variants & Designations
Typical designations for this size, subject to availability. Full suffix meanings are listed on the 303 series page.
30311 P6
higher running accuracy (ISO class 6)
30311 M
machined brass cage
Neighbouring Sizes in the 303 Series
30311 — Frequently Asked Questions
What are the dimensions of the 30311 bearing?
The 30311 has a bore (d) of 55 mm, an outside diameter (D) of 120 mm and a overall width of 31.5 mm, so it is written 55 × 120 × 31.5 mm.
What is the load rating of the 30311?
Dynamic load rating 139,500 N and static load rating 161,100 N. The speed rating is 3,960 rpm with oil lubrication; for grease lubrication use about 75% of that value.
Is the 30311 available with seals, special clearance or other options?
Yes, subject to availability. Typical designations include 30311 P6 (higher running accuracy (ISO class 6)), 30311 M (machined brass cage). Tell us the exact designation you need in a quote request.
Which other bearings have the same 55 mm bore as the 30311?
Other tapered roller bearings with a 55 mm bore include 32011 (90 mm OD), 33011 (90 mm OD), 33111 (95 mm OD), 30211 (100 mm OD). A larger outside diameter generally means a higher load rating.
Do you supply the 30311 bearing across India?
Yes. Logass Trade Centre supplies the 30311 Pan India with technical support, from single pieces to bulk orders. Use the quote button to share your quantity and brand preference.
Need pricing on the 30311?
Share your quantity and preferred brand — our technical team will confirm availability and pricing within one business day.