Nikon Lens Mount Repair





Introduction: Nikon Lens Mount Repair

Several of the cheaper "kit" lenses offered by Nikon have plastic mounts.  While these lenses have great optical quality, a number of us have managed to break of one of more of the platic mounting tabs.  I recently  replaced the mount after I managed to break off one of these tabs (I was clumsy and dropped my D40x about 6 inches, onto a carpeted surface).  The cost of replacement part was around 17 dollars, including shipping.  A new lens would have been over 100 dollars.  The actual lens that was repaired is the 18-55mm G series zoom.  I also have a 55-200mm zoom, and it has the same plastic mount.

Step 1: Order/obtain Replacement Lens Mount

I got mine from Nikon usa for about 17 dollars including shipping.  Please take note of the screw, brass plate and chrome mounting post in the left side of the first photo.  These are included with the replacement part.  I removed these and used the existing ones instead. 

Step 2: Prepare Tools and Workspace

The only tool needed is a small philips screwdriver.  I placed everything on a large sheet of white graph paper to be able to see the screws more easily.  A cup or saucer to hold these screws is a very good idea.  Pictured is the lens, screwdiver set and the replacement lens mount.

Step 3: Remove 8 Screws Holding Lens Mount in Place

There are 8 screws to remove.  3 larger screws can be seen in the first photo.  There are 5 smaller screws that face into the axis of the lens,  remove all 8, keeping track of where they came from.

Step 4:

Remove the inner piece as shown, setting it aside.  Keep track of your screws.

Step 5: Rotate CPU Contact Plate In, and Pull Mount Out

Gently rotate the CPU contact plate in as shown (it is attached with with a ribbon cable).  pull the lens mount out carefully, and let is flop as shown.  It is still attached with the white wire.

Step 6: Unscrew Bad Mount From White Wire

Unscrew the bad mount from the white wire and mounting bracket as shown.  Remove and set aside the bad mount. 

On the replacement part, unscrew the same mounting bracket.  you only need one, so use the one that is still attached to the lens.  Screw the bracket to the replacment mount.  Verify that the new part is attached to the lens and the old part is not.  You'd hate to have to do this all over again.

Step 7: Re-assemble

1. insert new replacement mount
2. rotate CPU contact plate back to its proper position
3. insert inner part removed earlier
4. tighten screws (do not over-tighten)
5. test lens
6. have a cold one (Important)



  • Paper Contest 2018

    Paper Contest 2018
  • Science of Cooking

    Science of Cooking
  • Pro Tips Challenge

    Pro Tips Challenge

We have a be nice policy.
Please be positive and constructive.




I found a "New Metal Bayonet Mount Ring for Nikon AF-S 18-55 & 18-105 & 18-135mm Lens" for $35 + $10 shipping here on eBay. The seller is zhuomingcamera (Based in China, zhuomingcamera has been an eBay member since Sep 01, 2010) Here is their store (I'm going to try it and report back.) Has anyone else tried this? I search all around to see if there was a metal replacement. (Even looking at other Nikon lenses to see if there was one that used the same Bayonet but it does not appear that other Nikon lenses use the same Bayonet. Although the Nikon (Nikon AF-S Nikkor 24-70mm f/2.8G ED - Bayonet Mount Ring Part - 1K404-175) seem close ( but it has 4 mounting screws and the Nikon 18-5 has 3 mounting screws. The photos show the black metal (it looks plastic but the show it side by side with a damaged plastic Bayonet). I could order the plastic one I found plastic one Amazon w/a 2 for $5.50 special on Amazon (Neewer® 2x Bayonet Mount Ring for Nikon 18-15 18-105 55-200mm Lens) I guess they think you will need 2 to repair it twice.

( I found this in these reviews under 2 product ratings.

Functional Issues: No problem!In good working order.It can replace the plastic bayonet of the Nikon AF-S 18-55mm,18-105mm,18-135mm, and 55-250mm lens.The metal Bayonet Mount is far more durable than the original plastic one!

"No More broken Plastic Lens Mounts!

This metal replacement mount fit perfectly and allowed the lens to operate normally with my camera. Very accurate fit. It is a bit expensive to put on a cheap 18-55 G or GII kit lens, but perfect for a Nikon 18-105 VR or 18-55 VR Lens.
The good news is It becomes the strongest part of your plastic lens. The bad news is you have to take more care not to drop or lay the lens down where any pressure could rip the mount of the lens body. Remember that the rest of the lens is still cheap plastic, so the lens repair for a broken housing is more expensive than a lens repair to replace the cheap plastic mount. Just be more careful with your lens while it is attached to the camera and hanging off your shoulder!"

Can Someone tell what that spring loaded inner part called?

and is there any mount selling with that part?

it broke in my lens

I just had to carry out this repair to my 18-55. Ordered the part on ebay UK, posted from Portugal to Germany (where I am) free of charge (good old EU!). The total cost was less than €7. The part was just the plastic, so I had a bit more work to do with reattaching the spring loaded part, oh and I broke the wire too, which meant a dab of solder to fix but all is now good and the lens is working perfectly again.

Nice tutorial. Out of curiosity I'm wondering if I can use the boyonet mount from one lens to another. One of my AIS lens mount for 105mm lens mount is screwed up and wondering if I can replace that mount using an eBay as is 50mm AIS lens. Is the mount different for different focal length?

I did it!! Thank you for the tutorial! I have the Nikon AF-S Nikkor 18-105mm 1:3.5-5.6G ED lens, and bought a plastic replacement ring of eBay or something for €2,- or so. Half way the repair the lens came apart further than I indented, but fortunately that was fixed by unplugging the ribbon cable from the Auto/Manual focus switch and unscrewing it, fitting the plastic ring again, and plugging/screwing the button back. In short some freighting moments, but I got it in the end :D.

A tip for people who are going to attempt this: keep the lensparts (zoom ring, focus ring, etc) tightly together, don't pull any up.

almost made it, almost. Pretty sure that I accidentally broke the wire or something, and the body couldn't recognize the lens. Thanks anyway.

hi, thank you for your useful instructions. I was doing the replacement but unfortunately as the cable was so fragile, it broke and I don't jnow what to do with all of it as it is detached. the other problem is that a little piece that took the metal parts in place is broken as well. I am so dissapointed

Do you know if they make metal replacement mounts? I dropped mine last week and while it still functions, I worry about light bleed.

I was on a cruise and swapped to my 70-300 lens,but it left me using my iPhone for candid photos. That lens has a metal mount and seems so much sturdier.

I have a Nikon J1 camera and I cant find any replacement parts for a 10-30 mm bayonet mount lens ring. Is there another one that is comparable ? I always see replacement rings for 18-105, 18-135 but never for 10-30.