8.8 mm ID Bearings | McMaster-Carr

Also known as jig bushings, these metric drill bushings fit inside fixture plate holes to guide drill bits, counterbores, reamers, and other cutting tools. They improve accuracy so that your drilled holes and cuts are consistent from part to part. Known for their versatility, drill bushings are also used as spacers, shims, and machinery bushings. These bushings are made of hardened, ground steel that holds its shape and resists wear, so they last for many cycles without needing to be replaced.

All bushings have a chamfer on the outside that centers the bushing as you place it into the hole. Press into place with a manual or hydraulic press. They also have internal chamfers, so it's easier to insert bits, pins, and punches into the bushing. DIN 179 bushings meet dimensional and material standards that make sure they're compatible with other parts and tools. Although DIN 179 is no longer an active standard, it's still a common reference point for designers.

Don't see the size you need? Additional sizes are available.

For technical drawings and 3-D models, click on a part number.

				Tolerance								Each
OD, mm	Lg., mm	Internal Chamfer	For Drill Bit Size	ID, mm	OD, mm	Lg., mm	Drill Bushing Type	Material	Hardness	Specifications Met		1-5	6-11	12-Up
8.8 mm ID
15	12	One End	8.8 mm	0.013 to 0.028	0.012 to 0.023	-0.2 to 0.2	PM	Steel	Rockwell C61	DIN 179	000000000	000000	00000	00000

Metric Press-Fit Drill Bushings with Head

Shown in Countersunk Hole

Shown in Standard Hole

Even under extreme drilling pressure, these metric bushings won't press through your jig plate. They’re ANSI Type H bushings, also known as headed bushings. A flanged head acts as a stop, so these bushings won’t move as you push down your drill bit, reamer, or other cutting bit. Use them even in jigs made of thin or soft materials—the head adds support to protect your jig from damage caused by heavy use. Drill bushings ensure accurate, consistent cuts and drilled holes from one part to the next. They’re also used as spacers, shims, and machinery bushings. Made of hardened, ground steel, these bushings hold their shape and resist wear, so they last for many cycles without needing to be replaced.

These bushings meet DIN 172 dimensional standards. This standard is no longer active, but it’s often used as a reference point for making sure parts are compatible with other parts and tools.

To install, fit the bushing into a hole in your jig. In a standard hole, the head will sit above the jig plate; to mount flush, install in a countersunk hole. A chamfered edge on the bottom of the bushing helps center the bushing in the hole. Once it’s centered, press the bushing into the hole with a hydraulic or lever press.

For technical drawings and 3-D models, click on a part number.

				Head		Tolerance								Each
OD, mm	Lg., mm	For Drill Bit Size	For Drill Bit Size Decimal Equivalent	OD, mm	Thick., mm	ID, mm	OD, mm	Lg., mm	Drill Bushing Type	Material	Hardness	Specifications Met		1-5	6-11	12-Up
8.8 mm ID
15	9	8.8 mm	0.3465"	18	3	0.013 to 0.028	0.012 to 0.023	-0.2 to 0.2	H	Steel	Rockwell C61	DIN 172	000000000	000000	000000	000000
15	17	8.8 mm	0.3465"	18	3	0.013 to 0.028	0.012 to 0.023	-0.2 to 0.2	H	Steel	Rockwell C61	DIN 172	000000000	00000	00000	00000