Parker 51 Clip Screw (Jewel)

VERY GOOD REPRODUCTIONS OF PARKER 51 JEWELS (REFERRED TO MORE PROPERLY AS "CLIP SCREWS" IN PARKER SERVICE MANUALS).  These photos were shot from 3 different angles so you could detect the iridescence in the grey/silver/swirled plastic. For comparison purposes, about half the jewels in each photo are reproductions and about half are original Parkers. These have the smaller of the two thread sizes that 51 clip screws came with, although most 51s used this size. The larger size was used for a very short while early-on. If you need to replace one with the larger thread size because your bushing has the larger threaded hole, we also sell the bushing with the smaller hole so you can replace both bushing and clip screw (Last item, Above). The outer threads of these replacement bushings are the same size as those used for both sizes of inner bushing hole.

Here are some notes from Ron Zorn on jewel & bushing threads: "The larger 4-40 holes for the stems were used on the second generation Vacumatics and on the Vacumatic filled  Parker 51.  They changed to the smaller stem and thread size in the bushing with the aerometric 51.  The threads on the outside are indeed 10-32, but if you have an aerometric, you'll need the smaller A bushing."

You CAN use different threads than what were originally used by changing the bushing thread size; this is needed if you are using our grey/silver jewels for Parker 51 caps, you may need to do this if you need to put one of our repro 51 jewels/clip screws on a 51 cap that has a 4-40 hole, you may need to change out the 4-40 bushing with a 3-56 bushing.

Pairs with Bushing A