GY-AHR ADJUSTABLE HAND REAMERS
Looking for a precise way to smooth and size drilled holes without needing a massive inventory of fixed tools? Our Adjustable Hand Reamers are the professional solution for achieving exact bore diameters with ease.
Built for versatility, these reamers feature independent blades seated in ramped grooves. By simply adjusting the captive nuts at either end, you can slide the blades to expand or contract the cutting diameter, allowing one tool to cover a wide range of odd or custom sizes.



Key Features
- Ultimate Versatility: One adjustable reamer does the work of multiple fixed-size tools, eliminating the need for expensive, single-purpose sets.
- Precision Adjustment: Easily change the cutting diameter by loosening one nut and tightening the other, allowing you to hit exact tolerances every time.
- Durable Blade Options: Available in both Carbon Steel and High-Speed Steel (HSS) to suit your specific material and durability requirements.
- Easy Maintenance: No need to replace the whole tool—worn blades are designed to be easily replaced by the user.
- Complete Size Ranges: Available in both Metric (mm) and Imperial (Inch) sizes to fit any project.
- Professional Presentation: Our sets come organized in an attractive, protective wooden storage box, keeping your tools safe and accessible.
Why Choose Adjustable Reamers?
They are the most economical choice for technicians and hobbyists who need to ream a small number of non-standard hole sizes. Whether you’re working on automotive repairs or custom machining, these tools ensure a smooth, professional finish with a custom fit.
| TECHNICAL SPECIFICATION | ||||
|---|---|---|---|---|
| American Size | Industrial Code | Range | No of Blades | |
| Inches | mm | |||
| 8/A | HV | 1/4″ to 9/32″ | 6.35 to 7.14 | 4 |
| 7/A | HW | 9/32″ to 5/16″ | 7.14 to 7.94 | 4 |
| 6/A | HZ | 5/16″ to 11/32″ | 7.94 to 8.73 | 4 |
| 5/A | HY | 11/32″ to 3/8″ | 8.73 to 9.52 | 5 |
| 4/A | H-1 | 3/8″ to 13/32″ | 9.52 to 10.32 | 6 |
| 3/A | H-2 | 13/32″ to 7/16″ | 10.32 to 11.11 | 6 |
| 2/A | H-3 | 7/16″ to 15/32″ | 11.11 to 11.91 | 6 |
| A | H-4 | 15/32″ to 17/32″ | 11.91 to 13.49 | 6 |
| B | H-5 | 17/32″ to 19/32″ | 13.49 to 15.08 | 6 |
| C | H-6 | 19/32″ to 21/32″ | 15.08 to 16.67 | 6 |
| D | H-7 | 21/32″ to 23/32″ | 16.67 to 18.26 | 6 |
| E | H-8 | 23/32″ to 25/32″ | 18.26 to 19.84 | 6 |
| F | H-9 | 25/32″ to 27/32″ | 19.84 to 21.43 | 6 |
| G | H-10 | 27/32″ to 15/16″ | 21.43 to 23.81 | 6 |
| H | H-11 | 15/16″ to 1-1/16″ | 23.81 to 26.99 | 6 |
| I | H-12 | 1-1/16″ to 1-3/16″ | 26.99 to 30.16 | 6 |
| J | H-13 | 1-3/16″ to 1-11/32″ | 30.16 to 34.13 | 6 |
| K | H-14 | 1-11/32″ to 1-1/2″ | 34.13 to 38.10 | 6 |
| L | H-15 | 1-1/2″ to 1-13/16″ | 38.10 to 46.04 | 6 |
| M | H-16 | 1-13/16″ to 2-7/32″ | 46.04 to 56.36 | 6 |
| N | H-17 | 2-7/32″ to 2-3/4″ | 56.36 to 69.85 | 6 |
| O | H-18 | 2-3/4″ to 3-11/32″ | 69.85 to 84.93 | 6 |
| P | H-19 | 3-11/32″ to 4″ | 84.93 to 100 | 6 |
| Q | H-20 | 4″ to 4-3/4″ | 100 to 120 | 6 |
| R | H-21 | 4-3/4″ to 5-1/2″ | 120 to 140 | 6 |
| Set of 7 Reamers – Size 8/A to 2/A (HV to H-3) | ||||
| Set of 8 Reamers – Size A to H (H-4 to H-11) | ||||
| Set of 11 Reamers – A to K (H-4 to H-14) | ||||
| Set of 9 Reamers – A to I (H-4 to H-12) | ||||
| Set of 5 Reamers – I to M (H-12 to H-16) | ||||


