Machine Reamers: Precision Tools for Accurate Hole Finishing

Machine reamers are essential cutting tools widely used in CNC machines, drill presses and machining centers to enlarge, smooth and size pre-drilled holes to tight tolerances. Unlike drills that cut rough holes, machine reamers deliver consistent surface finish and precise diameter, making them indispensable in metalworking, mold making, automotive and aerospace manufacturing.

Key Features

Our machine reamers adopt high-speed steel (HSS) or solid carbide substrates, with straight or spiral flute designs for different chip removal demands. Uniformly ground cutting edges reduce chatter and leave a burr-free inner surface. They are available in straight shank and Morse taper shank versions, compatible with most standard tool holders. Each reamer goes through strict heat treatment for high hardness, wear resistance and long service life.

Technical Specifications

 

Parameter	Details
Material	HSS/Solid carbide
Diameter	2.0-50mm
Flute type	Straight flute/Spiral Flute
Shank Type	Straight shank/Morse Taper shank
Tolerance	H7,H8,H9
Workpiece	Steel,Stainless steel,Cast iron,Aluminum,Brass

 

Core Advantages

First, outstanding dimensional accuracy. They maintain tight tolerance to avoid post-machining correction. Second, superior surface quality, effectively lowering Ra value for fitted holes. Third, stable cutting performance. Balanced flute geometry ensures smooth chip evacuation, less vibration and extended tool life. Fourth, wide compatibility. One series covers carbon steel, alloy steel and non-ferrous metals, helping workshops reduce tool inventory.

Application Scenarios

Machine reamers serve precision assembly holes, bearing seats, pin holes and hydraulic component holes. They are commonly selected by automotive parts factories, equipment manufacturers and engineering contractors.

FAQ

Q: What is the difference between hand reamers and machine reamers?

A: Machine reamers have shorter lead chamfer and stiffer bodies for power-driven equipment, while hand reamers feature longer starting tapers for manual operation.

Q: Can machine reamers work on stainless steel?

A: Yes. Our HSS-Co and carbide machine reamers perform well on stainless steel with proper cutting fluid and moderate feed speed.

Q: What tolerance grade should I choose for fitting holes?

A: H7 is the most popular choice for precision clearance or transition fits; H8 and H9 suit general non-critical assembly holes.