M8x45 / M10x45 M8 Thread Drill Quick Change Chuck Drilling Machine Parts

Need to swap drill bits on a boring head without touching the spindle? The C-M8*45 and C-M10*45 quick change chucks do exactly that: a 45 mm holder screwed onto an M8 or M10 threaded shank, bit clamped by two socket screws, made in R and L handings. 44 g per piece (M10*45), metal body, high accuracy and low vibration, packed in a plastic tube and a carton box. Packed per set, other sizes made to order.

A bit change on a boring head looks like a small job and rarely is one. The operator backs off the holding screws, pulls the bit, seats the new one, tightens, then re-checks depth because nothing proves the bit returned to the same seat. A shift repeats that dozens of times.

The C-M8*45 and C-M10*45 split the job into two parts. A threaded shank screws into the spindle once and stays; the 45 mm holder takes the bit in one movement and clamps it with two socket screws spaced along the body. The two sizes carry M8 and M10 threads, each produced in R (right-hand) and L (left-hand) handings.

A hex body between thread and holder takes a standard wrench for fitting or release. The M10×45 piece weighs 44 g, keeping spindle load low while the head indexes across a panel. Bodies are machined for high accuracy and run with low vibration, so the bit keeps the line it was set to.

Both sizes share the same 45 mm length, so a machine running M8 bits on one head and M10 bits on another needs one reach setting and one spare. Every piece ships in a plastic tube inside a carton box, and other sizes are cut to order.

What separates these holders from a plain threaded bushing:

• Two thread sizes, one length — C-M8*45 takes M8 bits, C-M10*45 takes M10 bits; both measure 45 mm overall, so one spare covers either head.
• Right-hand and left-hand — R and L are both produced, so a counter-clockwise spindle is a stock item, not a special order.
• Threaded shank, direct seat — The shank screws straight into the spindle thread with no intermediate adapter, removing one stacked joint.
• Two socket screws clamp the bit — The bit is held by two set screws spaced along the 45 mm body, reachable from outside with one hex key.
• Hex body for a wrench — Flats between thread and holder let the part be tightened or released with a standard wrench.
• 44 g on the larger size — The M10×45 piece weighs 44 g, so the head carries no extra load through every index.
• Machined for high accuracy — Bore and thread decide whether a bit runs true; both are cut to high accuracy and the part runs with low vibration.
• Plastic tube, then carton box — Each piece is packed in a plastic tube and boxed, so thread and bore reach the machine unmarked.
• Drop-in drilling machine part — Built as a replacement for spindles that take M8 or M10 threaded holders, with no machine modification.

The usual choice is between buying a second spindle assembly and living with hand-changed bits. A 45 mm holder that stays on the shank takes the second option off the table.

• A spare holder instead of a spare spindle. Keep one holder per bit size — an M8 and an M10 — and the change happens at the tool, not at the spindle.
• One setting for both sizes. Because both parts are 45 mm long, a line running M8 and M10 heads shares one reach setting and one depth reference.
• No more crossed threads. R and L are separate part numbers, so a counter-clockwise spindle gets the right thread the first time instead of a stripped shank.
• Depth that survives the change. Two set screws clamping a cylindrical shank give a repeatable seat, so the operator stops re-dialling after every swap.
• Light where it counts. At 44 g (M10*45) the part adds little to the moving head, which keeps indexing accurate over a long run.
• Stock that survives the shelf. A plastic tube and a carton box per piece mean spare holders can sit in a drawer for months without a dinged thread.
• Small part, small order. These are consumable-size parts, so a maintenance kit can be built without committing to a machine-level purchase — other sizes are cut to order.

Two: C-M8*45 for M8 bits and C-M10*45 for M10 bits, both 45 mm long. Other sizes are made to order.

It fits if your spindle takes an M8 or M10 threaded holder with a 45 mm body. Check the thread on the part you are replacing, then match it to C-M8*45 or C-M10*45.

Yes. R and L are separate handings and both are produced, so tell us the rotation direction of your spindle when you order.

Loosen the two socket screws with a hex key, pull the old bit, seat the new one, and tighten both screws again. The holder stays on the threaded shank the whole time.

44 g for the M10*45 piece. The M8*45 is the same 45 mm length in the smaller thread.

Metal. The body carries a ground bore and a blackened thread, and the part is machined for high accuracy with low vibration in service.

Each piece goes into a plastic tube, and the tubes are boxed in a carton box, so the thread and bore are protected in transit.

Send the size — C-M8*45, C-M10*45, or another size — with the quantity you need, and we reply with a quote.