HK4020 Needle Roller Bearing 40×47×20mm Drawn Cup For Hydraulic Cylinders Power Tools Automotive Parts

Product Overview
- HK4020 is an open‑end drawn cup needle roller bearing with dimensions 40×47×20mm. Without an inner ring, it adopts thin stamped steel cup and dense needle‑roller assembly. Made of GCr15 chrome steel, this compact‑section bearing delivers outstanding radial load capacity and high rigidity. Its open‑end design enables convenient lubrication, perfectly suited for compact‑structure machinery with limited installation space.
*Contact GQZ now for quick quotation and bearing samples.
Key Specifiions
| Item |
Specification |
| Model |
HK4020 |
| Bearing Type |
Single‑row Drawn Cup Needle Roller Bearing Open‑end Without Inner Ring |
| Fw (Bore diameter under rollers) |
40 mm |
| Outer Diameter (D) |
47 mm |
| Width (C) |
20 mm |
| Basic Dynamic Load(Cr) |
24.2 KN |
| Basic Static Load(C0r) |
53 KN |
| Weight |
0.052 kg |
| Internal Clearance |
CN Normal Clearance |
| Seal Type |
Open‑end No Seal |
| Material |
GCr15 Chrome Steel |
| Precision Rating |
P0 / P6 |
| Limiting Speed(Grease) |
6300 r/min |
| Limiting Speed(Oil) |
7000 r/min |
| Cage Material |
Sheet Steel |
Main Features
- Ultra‑thin cross‑section saves valuable installation space for compact equipment
- High radial load‑carrying capacity and high structural rigidity under heavy load
- Open‑end structure supports easy grease or oil lubrication and maintenance
- No inner ring, the shaft surface can serve directly as the inner raceway
- Low‑friction needle‑roller assembly ensures smooth stable rotation
- Heat‑treated drawn‑cup outer shell offers good wear‑resistance and long service life
Typical Appliions
- Hydraulic cylinders and hydraulic power units
- Automotive transmission and chassis components
- Power tools and small high‑speed rotary equipment
- Construction machinery gearbox assemblies
- Agricultural equipment and conveyor transmission parts
- General‑purpose compact industrial machinery
*Send your requirements, GQZ provides stock bearings & OEM service.
Why Choose GQZ Bearing
- 30 years professional bearing industry experience
- ISO certified strict quality inspection
- Flexible OEM & private label customization
- 3-5 days fast delivery for stocked bearings
- Full bearing series, universal interchangeable size
- Factory direct price & reliable after-sales service






FAQ
Q1: What does HK4020 open‑end mean?
A1: Both ends of this drawn‑cup needle bearing are open without bottom closure.
Q2: Does HK4020 come with an inner ring?
A2: No, it has no inner ring, the matched shaft needs sufficient hardness and finish.
Q3: What load can HK4020 mainly bear?
A3: It is designed to carry heavy radial loads, it can hardly take axial loads.
Q4: What is the difference between HK4020 and BK4020?
A4: HK4020 is open‑end, BK4020 has one closed‑end bottom.
*Cooperate with GQZ for high‑quality bearings and competitive factory prices.