Screws for Nikon H lens

<p>Hello all, <br>

I was wondering whether someone out there with expertise on this might be able to give me any leads on where I could source the screws for a Nikon 28mm 3.5 H series lens. I think it's from the late 60s early 70s (?). I have the back piece(es) but I'm trying to figure out where I can get the right (or close enough) machine screws to mount it. I mean those five there if, you can see the image. This is a very cheap lens but it would be nice to get use out of it, so anything close enough to hold it all together, that's the level of tolerance/expectation I'm at here. Any ideas would be gratefully received. </p>

<p><img src="http://i.ebayimg.com/images/g/MAwAAOSwCypWmYx1/s-l1600.jpg" alt="" width="773" height="800" /></p>

<p>I have had good service from http://www.metricscrews.us/ . You need to measure the diameter and depth of the hole + the thickness of the plate at the base of the screw head be it counter sunk or recessed to find the correct size you need. There is only one thread pitch for the small metric screws in a given diameter. Else search engine " miniature metric screws ".</p>

<p>I have some of the correct size, not original to Nikon but I tried them on a similar vintage lens and they fit correctly. </p>

<p>If you get my email from the forum, and send me an address, I will put them in an envelope and send them to you. </p>

<p>I have the older type 28/3.5 lens without screws in the back, and although I never cared for it on full frame, on DX digital it sings. </p>

<p>The original screws were JIS standard. http://www.photo.net/nikon-camera-forum/00PsSm</p>

<p>Fred C, all I can find in the link is that the screws have a crosspoint head. JIS is in Japan as SAE is in the U.S. The standard the screws are formed to do not state the size used in a particular piece of equipment.<br>

SAE screw tables list 32 different diameters and thread pitches with 21 of those having 2 thread classes for a total of 53 combinations. How many combinations in the JIS standard? Metric screw charts show 24 sizes total with 7 sizes having one of 2 thread pitches.</p>

<p>The screw holes in the pictured lens appear to be 2mm x .4 or 3mm x .5, length unknown.</p>

<p>Hey all, thanks so much for the replies. Looks like I'm on the way. It's difficult to measure the screw holes, but it looks like less than 2mm diameter and about 2-3mm depth under the head. <br>

I saw some footage of this lens shooting video on dx frame and it looked great. Surprisingly similar to mt 50mm 1.4 from that era, which I almost never take off the camera. </p>

<p>The original screws from that era are almost certainly single slot flat heads. The ones I have are cross point but fit correctly. Be careful because there is another JIS screw size which is used on many other brands of lenses that's just a tad smaller. The threads will not grab but it will be a little hard to get out of the hole. </p>

<p>Note that although there is some depth to the hole in the flange, the head must be fairly flat, not domed. </p><div></div>

<p>Note, got email and screws go out today if I beat the mail.</p>

<p>I just came across this chart http://www.engineersedge.com/hardware/metric-external-thread-sizes1.htm of metric screw sizes and their external dimension.<br>

The M2 screws are 1.9mm and the M1.8 are 1.7mm in diameter so I assume the M1.8 is a tad smaller than a M2.<br>

Both examples pictured in the previous post are pan head.</p>

<p>Matthew, I can't thank you enough for hooking me up with the screws. I would have had a hard time sourcing them, by the time I got through trial and error to get the right ones. Wow, what a great group! Thanks to all for guidance.<br /> I really dig this lens. The two images here are the 28mm f3.5 (top) and the Canon kit lens (bottom) at about 28mm f4. The difference may be subtle, but to me it's the same as with my Nikon 50mm 1.4: the color looks richer and less clinically accurate. This little guy from c.1969 ain't done working yet. Worth having in the bag for the $15. <br /><img src="http://i68.tinypic.com/j78d4g.jpg" alt="" /><br /><img src="http://i64.tinypic.com/zl57xt.jpg" alt="" /><br /><br /></p>