MH-P28K Headset Bearing 40×51.8×8 36/45 1B2 K518KH8 MR127 MR110 TH-073 ACB518K

(14 customer reviews)

£9.50 Ex. VAT

MH-P28K Headset Bearing 40×51.8×8 36/45 1B2 K518KH8 MR127 MR110 TH-073 ACB518K This is a chrome steel Angular Contact Headset Bearing designed for use in Bicycle steering systems. Photographs are for illustration purposes

44 in stock

SKU: BRG-HS-K518KH8 Category:

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): 51.8
  • Depth(mm): 8
  • 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-P28K, K518KH8, MR127, MR110, TH-073, ACB518K
  • The most popular lower 1 – 1 / 2″ bearing – cane creek fit

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.

Need some Help?

Additional information

Inside Diameter (ID)

40

Outside Diameter (OD)

51.8

Bearing Thickness/Height

8

Chamfer Angle (Internal)

36

Chamfer Angle (External)

45

14 reviews for MH-P28K Headset Bearing 40×51.8×8 36/45 1B2 K518KH8 MR127 MR110 TH-073 ACB518K

  1. Tim

    The bearings are great. There is no play in the bearing compared to the cheap chinese brands which require lots of preload. Given the price, I was expecting a budget offering but these are far from it.

    Technical support was great. The buying guide is one of the best I’ve ever seen. Well written and aimed at just the right level for people to make an informed decision.

    As others have pointed out. Hambini comes across as a bumbling buffoon on YouTube, his engineering knowledge is in a different league.

  2. Graham W.

    Excellent Bearing

  3. Andrew J.

    Replaced my headset bearings with these. Of the many on offer I chose Hambini because I believe, knowing Hambini’s reputation, that they will be top quality. They seem to be. I’m no expert. He is.

  4. Gary Williams

    Fab x 2!!

  5. colin cooper

    Very helpful sorting out what I needed, quick delivery at a reasonable price. Colin

  6. Michael H.

  7. Chris

    Not fitted yet but wanted a genuine product…

  8. Marcus Arraya

    Good service, item quickly dispatched.

  9. Paul N.

    Website provided comprehensive guide to get correct bearing which arrived quickly. Couldn’t fault the whole process.

  10. Mike F.

    smoothness

  11. David T.

    Perfect fit. Well engineered replacement headset bearings. I followed the comprehensive and straight forward guide on the Hambini website to select and very pleased with purchase.

  12. Andrew

    I bought these for a bike mechanic to fit – very impressed with the quality and delivery from Hambini was extremely quick and efficient

  13. Findlay

    1 of 2 quality bearings purchased for an excellent price and delivered within a few days. Fantastic service!

  14. Tomislav R.

Add a review

Your email address will not be published. Required fields are marked *

Q & A

Hi, can you tell me start diameter of the outer chamfer or the height of the chamfer? Is this bearing closed on one side like the MR127 sold by FSA or is the design like the one of the illustration photo? Thanks! Jonas asked on August 24, 2024

This bearing is exactly the same as an MR127, the photo is for illustration only.

admin answered on August 24, 2024 store manager
(0) (0)
Can this be used instead of an MR019. This one seems to be same except for better seals and 8mm height vs the MR019 is 7.5mm. Seems like it would be just a very slightly increase gap between fork and bottom of head tube. Mike asked on July 5, 2023

This will really depend on whether you've got the clearance in the bike frame. The bearing will functionally work in any scenario.

admin answered on July 13, 2023 store manager
(0) (0)

Ask a question

Your question will be answered by a store representative or other customers.

Thank you for the question!

Your question has been received and will be answered soon. Please do not submit the same question again.

Error

Warning

An error occurred when saving your question. Please report it to the website administrator. Additional information:

Add an answer

Thank you for the answer!

Your answer has been received and will be published soon. Please do not submit the same answer again.

Error

Warning

An error occurred when saving your answer. Please report it to the website administrator. Additional information: