Skipped threads
Small uncut fibres or joined sections along an otherwise straight line often indicate a dull or damaged edge.
A fresh edge changes the whole cutting experience
Restore clean, easy cuts to your everyday 45mm rotary cutter
The genuine OLFA RB45-1 replacement blade combines strong tungsten steel with OLFA's precise honing for smooth straight cutting through fabric, paper, suitable leather and other compatible materials. It is the standard 45mm blade trusted for quilting, dressmaking and general craft work.
- Genuine OLFA RB45-1 gives you the fit and cutting geometry intended for compatible 45mm cutters.
- Tungsten-steel construction provides a sharp, durable straight cutting edge.
- 45mm all-purpose size balances cutting depth, visibility and manoeuvrability.
- One blade per purchase arrives protected in a convenient plastic case.
One genuine blade
45mmEveryday rotary size
1 bladeRB45-1 purchase format
Tungsten steelStrong, precisely honed edge
Up to 8 layersOfficial cotton claim
What arrives: one genuine OLFA RB45 45mm straight rotary blade in a protective plastic case. The cutter handle is not included.
Three signs your rotary cutter needs a fresh RB45
A rotary cutter should roll through suitable fabric with controlled pressure. If you have started pressing harder or cutting the same line twice, inspect the edge before blaming the handle or your technique.
More hand pressure
If a familiar material suddenly needs force, fitting a fresh blade can make cutting smoother and easier to control.
Rough or dragged edges
A nicked blade can tug, distort or roughen the material instead of leaving the clean edge expected from rotary cutting.
OLFA's standard 45mm straight blade
Made for accurate lines, curves and suitable fabric layers
The circular edge rolls through the work, helping reduce the lifting and shifting that can occur with scissors. The versatile 45mm diameter is large enough for efficient strip cutting while remaining manageable around common pattern curves.
Quilting and patchwork
Cut strips, blocks, borders and suitable cotton layers against an acrylic ruler.
Dressmaking and sewing
Follow longer pattern edges and broad curves while leaving the fabric flat on the mat.
General craft cutting
Suitable for compatible paper, film, thin rubber sheet, leather and other materials when used with the correct cutter and mat.
Sharpness that makes accurate cutting feel easier
A fresh blade helps maintain a clean edge with controlled pressure.
The versatile 45mm format suits everyday quilting, sewing and craft work.
Compatible with most 45mm rotary cutter handles
OLFA lists RB45 for most 45mm rotary cutters, including the current OLFA models below. The cutter must be designed for a standard 45mm round blade and reassembled with every fixing part in the correct order.
Confirmed OLFA compatibility
- RTY-2/C Quick-Change Rotary Cutter
- RTY-2/NS Quick-Change Rotary Cutter
- RTY-2/G Straight Handle Rotary Cutter
- RTY-2/DX Ergonomic Rotary Cutter
- Other compatible OLFA 45mm cutters
- Most suitable third-party 45mm rotary cutters
This is not the right blade for...
- 18mm, 28mm or 60mm rotary cutter handles
- Tools requiring a proprietary non-standard mounting system
- Pinking, wave or perforation cuts
- OLFA WAB45 wave-blade applications
- OLFA PIB45 pinking-blade applications
- Any cutter whose instructions specify another blade
Unsure about another brand? Check the cutter manual or compare the existing blade specification before ordering. Diameter alone does not guarantee that every fixing system is identical.
Change the blade with the edge protected
Follow the cutter handle's own replacement instructions
Blade-change steps differ between slide-cover, quick-change and squeeze-handle cutters. Use the diagram supplied with your handle and keep every washer, nut and fixing part in its original order.
- Lock or fully cover the existing blade before loosening the assembly.
- Place the cutter on a stable surface rather than changing the blade in your palm.
- Hold blades by the centre opening or flat face and avoid the sharpened circumference.
- Reinstall every component in the correct order and orientation.
- Confirm the blade turns freely and the guard or lock operates correctly before cutting.
- Contain the used blade securely and follow local sharps-disposal guidance.
Simple habits that protect blade life
Use a self-healing mat
A suitable cutting mat protects the work surface and is gentler on the fine edge than glass, metal, stone or ordinary tabletops.
Keep fabric blades for fabric
Paper and abrasive craft materials can dull an edge more quickly. A dedicated textile blade helps preserve clean sewing cuts.
Remove every hard obstacle
Pins, clips, zips and ruler edges can nick the blade. Check the full cutting path before each pass.
Layer capacity varies: OLFA states that RB45 can cut up to eight layers of cotton in suitable conditions. The practical result depends on fabric thickness and finish, cutter design, blade condition, mat, ruler and technique.
OLFA RB45-1 45mm Rotary Blade specifications
| Brand | OLFA |
|---|---|
| Article | RB45-1 |
| Direct Sewing SKU | RB4511 |
| Product type | Straight rotary cutter replacement blade |
| Blade diameter | 45mm |
| Blade material | Tungsten steel |
| Edge type | Continuous straight rotary edge |
| Purchase quantity | One blade |
| Storage | Protective plastic case included |
| Compatibility | Most compatible 45mm rotary cutters |
| Confirmed OLFA models | RTY-2/C, RTY-2/NS, RTY-2/G and RTY-2/DX |
| Official layer claim | Up to eight layers of cotton in suitable cutting conditions |
| Suitable materials | Fabric, paper, suitable leather, film, thin rubber sheet and other compatible materials |
| Country of manufacture | Japan |
| Included | One genuine OLFA RB45 45mm blade in a plastic case |
OLFA RB45-1 FAQs
How many blades will I receive?
One genuine OLFA RB45 45mm blade in a protective plastic case. This listing is for the RB45-1 single-blade pack.
Will it fit my 45mm rotary cutter?
OLFA states that RB45 fits most 45mm rotary cutters and confirms RTY-2/C, RTY-2/NS, RTY-2/G and RTY-2/DX. Check the instructions before fitting it to another brand or an older model.
Is this a straight or decorative blade?
It is a standard continuous straight-cut blade. It does not create a pinked, wave or perforated edge.
What is the blade made from?
OLFA manufactures RB45 from tungsten steel and expertly hones the cutting edge.
Can it cut several fabric layers?
OLFA states up to eight layers of cotton in suitable conditions. Actual capacity varies with fabric thickness and finish, cutter design, mat, blade condition and technique.
How do I know the old blade is dull?
Common signs include skipped fibres, needing more pressure, repeated passes or a rough dragged edge. Check first that the cutter is assembled correctly and the mat is suitable.
Is the cutter handle included?
No. This listing contains one replacement blade and its plastic case only.
What is included?
One genuine OLFA RB45 45mm tungsten-steel straight rotary blade in a protective plastic case.
Bring your 45mm cutter back to clean, controlled cutting
Choose the genuine OLFA RB45-1 when your everyday rotary cutter starts skipping fibres, dragging the material or asking for more pressure than it should.
Check Cutter Compatibility