MH-P25K Headset Bearing 40x52x6.5 36/45 2B2 K4052KH6.5 BAA0006K ACB 6808 CC
£8.95 Ex. VAT
MH-P25K Headset Bearing 40x52x6.5 36/45 2B2 K4052KH6.5 BAA0006K ACB 6808 CC This is a chrome steel Angular Contact Headset Bearing designed for use in Bicycle steering systems. Photographs are for illustration purposes
29 in stock
Description
This is a premium HPE (Hambini Performance Engineering) headset bearing designed for Front Fork steerer systems on bicycles. This is a chrome steel bearing with hardened inner and outer raceways. The internal cage that supports and spaces the balls is reinforced to improve axial stiffness. The geometrical and dimensional tolerances and running clearances would be broadly in line with JIS B1514 Tolerance Class 0 (There is no ISO standard for Bicycle Headset Bearings).
This bearing has been made to Hambini specifications and manufacturing procedures. The types of seals, the grease, the contact angles and the materials have been specified to ensure optimum performance and continued reliability. The bearings are made in a ISO 9002 certified factory.
- Internal Diameter(mm): 40
- External Diameter(mm): 52
- Depth(mm): 6.5
- Internal Chamfer(degrees): 36
- External Chamfer(degrees): 45
- Material: AISI 52100 DIN 1.3505 SUJ2 EN31
- Seals: Double Rubber
- Seal Material: Nitrile (NBR)
- Grease: Shell Gadus / Mobil XHP / Petronas EP2
- Grease Rating: NLGI 2
- Alternative Part Numbers: MH-P25K, K4052KH6.5, BAA0006K, ACB 6808 CC
- For hope tapered headsets (lower bearing) & Cane Creek Series 40 and 110
Notes:
- Made to Hambini Specifications
- The majority of HPE headset bearings are made in Taiwan
- 1 Year Warranty (this does not cover wear)
- In the event of a HPE bearing being unavailable, you will be supplied with a bearing from the German company ZEN
The Hambini Difference
HPE bearings are finished in a 3 step process that involves multiple grinding stages followed by 2 – stage superfinishing of the raceways. This is accomplished with the use of Saint-Gobain Norton abrasives in an ISO registered factory. Superfinishing results in smoother running surfaces and smoother bearing rotation. Whilst vibration levels for headset bearings are largely irrelevant, vibration does correlate directly with the quality of the bearing. HPE bearings typically exhibit 30-40% lower vibration than competitor products.
The grease in HPE bearings is a heavy duty NLGI 2 grease. Headset bearings will never complete one rotation in their lifetime and generate little to no heat. The bearings have a 90% grease fill rate and has water repelling properties. A thick, pure marine grade of grease has not been used owing to the widely documented propensity for thick grease to develop cavities and thus provide no protection. This is exacerbated by the lack of bearing rotation meaning their is little opportunity for heat generation to turn the grease from semi solid material to fluid.
Each Bearing has been designed from the ground up, they are not derivatives of 6000 and 7000 series bearings that have been modified to suit the boundary dimensions. The contact angles, ball sizes, cages and races have been designed for the load characteristics.
Bearing Quality
There is a considerable difference in the quality of headset bearings. Many bearings that are imported from the far east feature raceways that are neither hardened nor ground. Notice the picture below showing pinch marks where the material has chipped away (coloured orange) and poor finishing (circumferential groove).
The pictures below show Hambini Headset bearings as a comparison.
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Additional information
| Inside Diameter (ID) | 40 |
|---|---|
| Outside Diameter (OD) | 52 |
| Bearing Thickness/Height | 6.5 |
| Chamfer Angle (Internal) | 36 |
| Chamfer Angle (External) | 45 |
Jez –
The technical support from Hambini is at another level. I had been going through headset bearings at a rate of 1 each month so I sent Hambini the bearing to have a look at. He replied with a lengthy email with suggestions, he selected an appropriate bearing fit and boom all of my problems have gone away. No clunking in the steering.
With that level of technical support and service, I will not be going anywhere else.
Anonymous –
Good quality bearing, good price, fast delivery.
Brendan K. –
This is a much better quality bearing than the price might lead you to believe. It replaced a Cane Creek bearing that was 3 times the cost and lasted 3 months. The seals are noticeably different.
paul alexander –
Ordering was simple as all key dimensions were stated clearly. Communication was eccelent and shipping fast. Bearing were great quality.
Darren T. –
It’s a bearing, but it’s a good bearing and price/delivery was great!
gary s. –
Habini provides Quality products
D T. –
As always, Hambini bearings are great, the web site is easy to navigate and delivery is fast
Andrew Naylor –
Very good quality bearings at a fair price and delivered extremely quickly