20x43.5 CNC Adapters Quick Change Drill Holders Drill Machines Chuck

A 20X43.5 quick change adapter is the 20 mm outside diameter, 43.5 mm long sleeve that mounts a drill machines chuck in a CNC tool holder so the chuck can be released and refitted by hand, with no spanner in the changeover. The size code carries both dimensions, so one number checks the fit: 20 mm outer diameter, 43.5 mm length. It is the adapter between holder and chuck, not a complete chuck. Customisation in other sizes is available, and price is quoted per order.

Chuck changes fail on three things: the spanner that disappears between shifts, the wrong sleeve that arrives because two adapters look alike, and a holder left idle while a whole chuck is swapped instead of the adapter. None needs a bigger machine budget, only the right 20 mm part in the holder.

The 20X43.5 quick change adapter is that part: 20 mm outer diameter, 43.5 mm overall length, sold under the size code 20X43.5. It seats in a CNC tool holder and the chuck mounts onto it, so a tool free drill machines chuck change happens at the adapter, not at the spindle taper.

The two numbers carry the specification. 20 mm is the outer diameter that locates in the holder; 43.5 mm is the length that sets the stand-off between holder face and chuck body. Order by the size code, not by a photo: two adapters 0.5 mm apart in either dimension look identical in a drawer and land differently on the machine.

Its category is CNC tool holders, so it belongs on CNC tooling, not a bench drill. The same body is also listed as a drill sleeve and a tooling socket, the second job it does when a drill shank has to come down to holder size. Customisation is available for other diameters and lengths; price is quoted per order.

Every claim on this part is a number you can put a caliper on.

• Tool free chuck change — the adapter is the mounting point for a chuck change made by hand, so no spanner sits in the changeover.
• 20 mm outer diameter — the diameter that seats the adapter in the CNC tool holder, and the first of the two numbers to match.
• 43.5 mm overall length — the length that sets how far the chuck body stands off the holder face.
• Size code 20X43.5 — one number on the order line holds both dimensions, so a 20 mm diameter and a 43.5 mm length are never checked separately.
• CNC tool holder application — built for the holder side of a drill machines chuck setup, under the CNC tool holders category.
• Adapter, not a chuck — the body mounts between holder and chuck, so the chuck itself stays a separate item on the order.
• Drill sleeve and tooling socket — the same body is listed under both names, which covers a drill shank that has to come down to the 20 mm holder size.
• Customisation available — other diameters and lengths can be quoted, with 20X43.5 as the reference size for this listing.
• Quotation per order — price is written against the size code, so one adapter and a batch are quoted the same way.

The usual choice is between changing a whole chuck and finding the one adapter that makes a hand change possible.

• Change the adapter, not the chuck. A 20 mm adapter held as a spare is a fraction of a second chuck body, and the machine goes back onto the same holder.
• A hand change, not a spanner hunt. The mounting is made for a tool free chuck change, so the changeover depends on the operator, not on which spanner is in the drawer.
• The size number does the matching. 20X43.5 is one code, so the 20 mm diameter and 43.5 mm length are checked in a single step instead of by eye.
• Fewer wrong parts in the drawer. Because both dimensions sit in the code, an adapter 0.5 mm off is caught on the order line rather than at the spindle.
• One spare line, several holders. The part is listed under CNC tool holders generally, so a single stock line covers the holders on a shop floor.
• Custom sizes, no dead end. Customisation is available, so a holder that will not take 20 mm can be quoted instead of written off.
• Price before commitment. Quotation is per order, so a single adapter and a production batch are priced against the same 20X43.5 size code.

It is a 20 mm outer diameter, 43.5 mm long adapter that mounts a drill machines chuck in a CNC tool holder so the chuck can be changed by hand. It is the adapter between holder and chuck, not a complete chuck.

Match both numbers first: 20 mm outer diameter and 43.5 mm length. A part that matches one number and not the other may still seat, but it will stand off at the wrong distance.

No. The adapter is the mounting for a tool free chuck change, so the changeover is done by hand at the adapter.

20 mm is the outer diameter and 43.5 mm is the overall length. The code is the two dimensions written together, which is why it works as the order number.

An adapter only. The chuck body is a separate item; this part is the quick change adapter that sits between the CNC tool holder and the chuck.

Only a holder that takes the 20 mm diameter at the 43.5 mm length this adapter is made to. The holder brand alone does not confirm a fit; those two dimensions do.

Yes. Customisation is available, so other sizes can be quoted from your dimensions, with 20X43.5 kept as the reference size for this listing.

Price is quoted per order rather than fixed on the page. Send the size code 20X43.5 together with the holder you are fitting it to, and the quote is written against both.