Fiber Cleaver Blade Replacement Guide: When to Rotate, Adjust Height or Replace (Sumitomo FCP-20BL & COMWAY CC-03)
Quick answer: Most precision cleavers use a round blade with multiple positions and heights. When cleave quality drops, first clean the blade and clamp pads, then rotate to the next blade position, then raise the blade height. When every position and height has been used, replace the blade, for example with the Sumitomo FCP-20BL (FC-6S, FC-6S+, FC-8R) or the COMWAY CC-03 replacement blade.
Signs Your Cleaver Blade Is Worn
- The splicer reports a high cleave angle or rejects end faces
- Lips, hackles or chips on the fiber end in the splicer view
- Fiber doesn't break cleanly or needs extra force
- Splice loss rises even with clean electrodes
Step 1: Clean Before You Blame the Blade
Glass shards and coating residue on the clamp pads cause many bad cleaves. Wipe pads and the blade edge with an alcohol-dampened swab and remove fiber scraps.
Step 2: Rotate the Blade
Round blades are divided into positions. Automatic-rotation cleavers such as the Sumitomo FC-8R and COMWAY CC-03 rotate for you; manual models need you to turn the blade to the next mark per the user manual.
Step 3: Adjust Blade Height
Once all positions are used, raise the blade to the next height setting and start again. Follow the manufacturer's procedure and tools.
Step 4: Replace the Blade
When all heights and positions are exhausted, fit a new genuine blade, reset the counter if your cleaver has one, and test several cleaves before field use.
Replacement Blade Compatibility
| Blade | Fits |
|---|---|
| Sumitomo FCP-20BL | Sumitomo FC-6S, FC-6S+, FC-8R |
| COMWAY CC-03 blade | COMWAY CC-03 |
Extend Blade Life
- Strip and clean fiber properly first. See our fiber stripping guide.
- Never cleave coated fiber.
- Keep the cleaver in its case and away from dust.
- Use the scrap collector to keep shards off the blade.
Choosing a new cleaver? Read our 2026 fiber cleaver comparison. Keep your splicer in shape with our electrode replacement guide.
FAQ
How long does a cleaver blade last?
It depends on the model and care. Premium cleavers are rated for tens of thousands of cleaves across all blade positions and heights.
Should I rotate or replace the blade first?
Clean first, then rotate, then raise height. Replace only when every position and height is used.
Does the FCP-20BL fit the FC-8R?
Yes. The FCP-20BL is listed for Sumitomo FC-6S, FC-6S+ and FC-8R cleavers.
Can I sharpen a cleaver blade?
No. Cleaver blades are precision parts and should be replaced, not sharpened.