Uwe Report post Posted December 30, 2015 I'm looking for a Durkopp Adler screw that holds down the pivot spring on the arm of the Adler 69 machine. I have a part number "992 02 203 7" and a description "Nr.40x7" The part that's a mystery to me is what this screw size translates to in the real world. I'm measuring a thread diameter of 3.71mm and thread pitch of 0.66mm, which doesn't line up with any of the usual suspects in the fractional, metric, or weird x/64" world. If anybody recognizes this screw or knows where I can buy a dozen of them for less than $5.63 a piece, I'd appreciate a pointer. Quote Share this post Link to post Share on other sites
Darren Brosowski Report post Posted December 30, 2015 Ouch, an odd one. Do you have a Singer/Seiko/Consew type you can test as the 69 is similar in many ways and can trace its roots back to the Singer 153/155 - Ithink Quote Share this post Link to post Share on other sites
SARK9 Report post Posted December 30, 2015 That screw on my slightly oddball Mitsubishi has a major diameter of 4.2mm. Don't have a Pfaff to compare. -DC Quote Share this post Link to post Share on other sites
Darren Brosowski Report post Posted December 30, 2015 OK, found one for the Singer 155 which in theory is the same as the Seiko LSC and Consew 227. OD is 1.50 Pitch is around 0.65. Cannot find my pitch gauge so using the verniers. Quote Share this post Link to post Share on other sites
Uwe Report post Posted December 30, 2015 (edited) As luck would have it, I found a perfect match, even better than I had hoped for, and I already have a dozen of them on hand! I had ordered "proper" replacement faceplate thumb screws for my Tacsew T1563 (Juki LU-563 clone) project machine a few weeks ago (along with a bunch of other parts.) The Juki part number is B-3106-019-000 and MJ Foley sells them for $0.36 each (yay!) Since they were so cheap I ordered a bunch to make it worthwhile (and hoping they would also fit my Singer 111W155, but they don't). It turns out these screws are a perfect fit for the pivot thread in my Adler 69 and they're thumb screws, which is even better than the original. I'm hoping they'll fit the old casting Pfaff 335 pivot point as well, so I can use them with my flatbed table attachments (modern Pfaff 335 uses M5 screws). Edited December 30, 2015 by Uwe Quote Share this post Link to post Share on other sites
shoepatcher Report post Posted December 30, 2015 Uwe, Juki normally publishes the specs on the screw in their parts catalogue. Do you know what machine this screw came from? If so, the parts book will tell us the specs on the screw. glenn Quote Share this post Link to post Share on other sites
Uwe Report post Posted December 30, 2015 This part number came from the Juki LU-563 parts list. That particular screw does not have specs listed with it. In fact they discontinued using B-3106-019-000 screw in 1983 and replaced with a new screw part number SS-7090610-SP which does have specs listed as 9/64-40. The pitch matches and the 9/64 diameter is close with 9/64"=3.57mm compared to the measured 3.47mm, but I'm not sure the two screws are in fact interchangeable. Quote Share this post Link to post Share on other sites
TinkerTailor Report post Posted December 31, 2015 (edited) Do you have a way to measure the minor diameter of the thread? The major diameter can be smaller sometimes because the tops of the threads have either worn off or were overly deburred during manufacture, however the minor diameter should stay close to the same. If the minor diameter is too big, the screw wont fit. Here is a "thread" that has some good info: http://www.practicalmachinist.com/vb/general/sewing-machine-screw-thread-sizes-225457/ http://www.gewinde-normen.de/en/sewing-machine-thread.html Edited December 31, 2015 by TinkerTailor Quote Share this post Link to post Share on other sites
