Bring pre-drilled holes to their final nominal size with this 3/4″ HSS Straight Flute Hand Reamer.
A hand reamer is a finishing tool used to remove a small amount of material from an existing hole. When correctly applied, it helps produce a more accurately sized hole with improved roundness and internal surface finish.
The reamer’s long starting taper guides the cutting tool into the pre-drilled hole. Its gradual lead allows the cutting edges to engage progressively, supporting easier entry and more accurate alignment during manual operation.
The straight-flute design is recommended for most conventional hand-reaming applications involving uninterrupted holes. For holes containing a keyway, slot, cross hole or another interrupted surface, a spiral-flute hand reamer is generally preferred.
The round shank includes a square drive section suitable for holding with a compatible tap wrench. Depending on the setup, the reamer may be rotated through a stationary workpiece, or it may be securely held while the workpiece is rotated.
Recommended Applications
- Final sizing of pre-drilled holes
- Improving internal hole finish
- Improving hole roundness
- Manual fitting and assembly
- Toolroom operations
- Machine-shop work
- Maintenance and repair
- General hand reaming of uninterrupted holes
Technical Specifications
| Specification | Value |
|---|---|
| Nominal size | 3/4″ |
| Decimal equivalent | 0.750″ |
| Metric equivalent | 19.05 mm |
| Reamer type | Hand reamer |
| Flute style | Straight flute |
| Flute length | 4-3/16″ |
| Overall length | 8-3/8″ |
| 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 suitable tap wrench to the square drive.
- Align the reamer concentrically with the existing hole.
- Apply an appropriate cutting fluid.
- Rotate the reamer slowly and evenly in the cutting direction.
- Maintain steady axial alignment without forcing the tool.
- Complete the cut and carefully remove the reamer.
- Clean and measure the finished hole.
Important Operating Notes
- This tool is intended for finishing an existing hole.
- It should not be used to drill a hole from solid material.
- The initial hole should be properly aligned and only slightly undersized.
- Avoid reversing the reamer while the cutting edges are engaged.
- Use cutting fluid appropriate for the workpiece material.
- Verify the final diameter with a suitable measuring instrument.
Straight-Flute vs. Spiral-Flute Reamers
Use a straight-flute hand reamer for most conventional hand-reaming applications involving continuous, uninterrupted holes.
For holes containing keyways or other interrupted surfaces, consider a spiral-flute hand reamer to provide smoother cutting action across the interruption.
Frequently Asked Questions
What is the nominal finished diameter?
The reamer has a nominal size of 3/4″, equivalent to 0.750″ or 19.05 mm.
Can this reamer make the initial hole?
No. An undersized hole must be drilled before reaming. This tool is intended only for final sizing and finishing.
Is this tool designed for manual operation?
Yes. It is a hand reamer with a square drive end designed for use with a compatible tap wrench.
Why does it have a long starting taper?
The long taper helps guide the tool into the pre-drilled hole, provides gradual cutting engagement and supports accurate alignment.
Can it be used on a hole with a keyway?
For a hole containing a keyway, slot or another interrupted surface, a spiral-flute hand reamer is generally the better option.
Is this reamer coated?
No. It is made from high-speed steel and has an uncoated bright finish.
What is the flute length?
The flute length is 4-3/16″.
What is the overall length?
The overall length is 8-3/8″.
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