Accurately finish pre-drilled holes with this 5/8″ HSS Straight Flute Hand Reamer.
A hand reamer is used after drilling to remove a small amount of material and bring an existing hole to its required nominal size. It can also help improve the hole’s roundness and internal surface finish. This tool is intended for final sizing and should not be used to create a hole from solid material.
The reamer incorporates a long starting taper that guides the cutting tool into the existing hole. The gradual lead promotes easier entry, progressive cutting engagement and more accurate alignment.
Its straight-flute geometry is recommended for most conventional hand-reaming applications involving uninterrupted holes. If the hole contains a keyway, slot or another interrupted surface, a spiral-flute hand reamer is generally the more appropriate option.
The round shank terminates in a square drive section suitable for holding with a compatible tap wrench. Depending on the setup, the reamer may also be secured while the workpiece is rotated.
Recommended Applications
- Final sizing of pre-drilled holes
- Improving internal hole finish
- Improving hole roundness
- Manual fitting and assembly work
- Toolroom and machine-shop applications
- Maintenance and repair operations
- General hand reaming of uninterrupted holes
Technical Specifications
| Specification | Value |
|---|---|
| Nominal size | 5/8″ |
| Decimal equivalent | 0.625″ |
| Metric equivalent | 15.875 mm |
| Reamer type | Hand reamer |
| Flute style | Straight flute |
| Flute length | 3-1/2″ |
| Overall length | 7″ |
| Cutting material | High-speed steel |
| Finish | Bright / uncoated |
| Main shank form | Round |
| Drive end | Square |
| Suggested package quantity | 1 piece |
How to Use
- Drill the initial hole slightly below the required finished diameter.
- Secure the workpiece firmly.
- Attach a compatible tap wrench to the reamer’s square drive.
- Carefully align the reamer with the existing hole.
- Apply a cutting fluid suitable for the workpiece material.
- Rotate the reamer slowly and evenly in the cutting direction.
- Maintain steady axial alignment and avoid forcing the tool.
- Complete the cut and remove the reamer carefully.
- Clean and measure the finished hole.
Important Operating Notes
- Use only for final sizing of an existing hole.
- Do not use the reamer as a drill.
- The pre-drilled hole should be properly aligned and only slightly undersized.
- Avoid reversing the reamer while its cutting edges remain engaged.
- Use suitable cutting fluid for the material being machined.
- Confirm the finished diameter with an appropriate measuring instrument.
Straight-Flute vs. Spiral-Flute Reamers
A straight-flute hand reamer is recommended for most general applications where the hole has a continuous internal surface.
A spiral-flute hand reamer is generally preferred when the hole includes interrupted surfaces, such as keyways, slots or cross holes.
Frequently Asked Questions
What is the nominal finished hole size?
The nominal size is 5/8″, equivalent to 0.625″ or 15.875 mm.
Can this reamer make a new hole?
No. The initial hole must be drilled before reaming. This tool is designed for final sizing and finishing only.
Is this reamer operated by hand?
Yes. It is a hand reamer with a square drive end intended for use with a compatible tap wrench.
What is the purpose of the long starting taper?
The long taper guides the reamer into the pre-drilled hole, provides gradual cutting engagement and assists with accurate alignment.
Is it suitable for holes containing keyways?
For holes with keyways or other interrupted surfaces, a spiral-flute reamer is generally recommended.
Does it have a protective coating?
No. The HSS cutting tool has an uncoated bright finish.
What is the flute length?
The flute length is 3-1/2″.
What is the overall length?
The overall length is 7″.
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