Most commonly encountered type of jack flange on fullsize upright piano actions, also seen in most (if not all) studio pianos and some consoles.  Just under 2 13/16" (71mm) or 2.8" from centerpin hole to tip of jack. 1 jack with installed flange included in this auction.

Please note I have 6 packs available in my eBay store, item #294195708962

In some cases, a jack adjacent to a support post for the regulating rail will have a notch cut in the side for clearance (see pic).  If you need a notched jack, message us in the "note to seller" section of checkout and let us know which side you need notched (determined when facing the action as installed in the piano).  Last pic shows a jack with a left notch - it is installed to the right of a support post. We will ship the appropriate jack IF we have one on hand.  Otherwise you receive a jack without a notch and will need to know to notch it yourself with a file or similar tool.

I've been servicing pianos full time since I was 17 years old (35+ years) and in that time have serviced multiple hundreds of pianos - antique uprights, spinets, consoles, studios, square grands, baby grands and grands.  I'm glad to answer questions about this product before or after the sale - my contact info is included in each shipment and you can also reach me through eBay.

We combine shipping.  Place all items you're interested in into your cart then checkout when finished - eBay will automatically calculate the best shipping rate/options.