CNC Machined Stainless Serrated Blade and Jaw Set
Serrated blades and comb jaws machined from 304 stainless: a 180 mm blade with a 0.8 mm tooth pitch held to ±0.02 mm, 1.2 mm tooth height, 0.05 mm edge radius and straightness of 0.03 mm over the full length. The matching comb jaw carries twelve 0.9 mm slots on a 1.6 mm pitch so the blade passes through without contact.
- Tooth Pitch 0.8 mm ±0.02
- Straightness 0.03 mm
- Edge Radius 0.05 mm
- 304 Stainless, Passivated
*Send a sample of the material being cut. Tooth pitch and edge radius are set from the web thickness, and a blade that is 0.02 mm too thick will bind in the comb instead of shearing.
Stainless Blade and Comb Jaw Overview
A serrated blade only works if the teeth are uniform, the edge is sharp without being fragile, and the blade stays straight along its whole length. The comb jaw then has to hold the slots at exactly the blade pitch, or the blade rubs and the cut edge frays.
The blank is milled to thickness, the teeth are roughed with a 0.8 mm end mill and finished by wire EDM so the roots are square, and the edge is honed to a 0.05 mm radius. The comb slots are cut in one pass on the wire with the same pitch reference, and both parts are passivated together.
304 Stainless Steel
304 gives a blade that resists staining in a wet process line and holds a fine tooth at 42 HRC after stress relief, without the brittleness of a 440C edge.
316L or 420
316L is used for food and medical lines where chloride attack is a risk, and 420 is chosen when the blade runs against an abrasive web and needs higher hardness.
A blade thinner than 1.2 mm will bow when the teeth are milled; the thickness is set at 1.5 mm and relieved only behind the tooth line.
Serrated Blade Specifications
Tooth, slot and edge data, expressed the way a blade is actually measured.
| Specification | Machining Data | Specification | Machining Data |
|---|---|---|---|
| Product | Serrated Blade and Comb Jaw Set | Process | CNC Milling, Wire EDM, Grinding |
| Material | 304 Stainless Steel | Blade Length | 180 mm ±0.10 mm |
| Tooth Pitch | 0.8 mm ±0.02 mm | Tooth Height | 1.2 mm ±0.03 mm |
| Blade Thickness | 1.5 mm ±0.02 mm | Straightness | 0.03 mm Over 180 mm |
| Comb Jaw Slots | 0.9 mm Wide, 12 Slots | Slot Pitch | 1.6 mm ±0.02 mm |
| Cutting Edge | Radius 0.05 mm, No Burr | Hardness | HRC 42 After Stress Relief |
| Mounting Holes | 2 × Ø4 H7, ±0.03 mm | Weight | Approx. 62 g per Set |
| Inspection | Profile Projector, Edge Microscope | Batch Size | 50 to 5,000 Sets |
| Finish | Passivation, No Coating on Edge | Drawing Format | DXF, STEP, PDF |
Teeth That Cut, Not Tear
Wire-cut roots, a honed edge and a comb cut to the same pitch.
Teeth Wire-Cut, Not Milled Through
The tooth roots are finished on the wire so they are square and identical, which stops one tooth from standing proud and taking the whole cut load.
Edge Honed to a Controlled Radius
A 0.05 mm radius is put on the cutting edge under a microscope, sharp enough to shear the web and strong enough that the tip does not chip on the first stroke.
Blade and Comb Cut to One Pitch
The comb slots and the blade teeth are cut from the same pitch reference, so the blade passes through the comb with 0.05 mm clearance per side instead of rubbing.
Straightness Checked on a Granite
Each blade is checked for straightness over its full 180 mm on a granite plate, and any blade over 0.03 mm is straightened before passivation.
Blade set that has to shear cleanly?
Surface Finishes for Blade Sets
The body can be coated, the edge cannot; masking decides which is which.
| Finish | Main Purpose | Finish | Main Purpose |
|---|---|---|---|
| Passivation | Removes free iron after machining | Electropolishing | Burr-free cutting edge |
| Bead Blasting | Matte body, masked teeth | Laser Marking | Batch and tooth count |
| Black Oxide | Low-reflection body | Titanium Nitride | Wear life on abrasive stock |
| Masked Edge | Edge kept bare and sharp | Ultrasonic Clean | Removes polishing compound |
| Deburr Only | Blade used in a wet process | Edge Honing | Controlled 0.05 mm radius |
| Oil Dip | Short-term rust protection | VCI Wrap | Blades shipped sharp and dry |
*Electropolishing removes 3 to 5 µm from every surface, which dulls a 0.05 mm edge; the edge is masked when the body is polished.
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How We Machine a Blade and Comb Set
The teeth are milled at a 0.8 mm pitch and then wire-cut to a 0.05 mm edge radius, so the blade cuts instead of tearing the web.
01. Web and Machine Review
Check the web thickness, the cut length and the machine stroke, then set the tooth pitch and the edge radius from the material sample.
02. Mill the Blank
Mill the blank to 1.5 mm with a 0.3 mm finish allowance on both faces, drill the mounting holes and stress-relieve before the teeth are cut.
03. Rough and Wire the Teeth
Rough the tooth gaps with a 0.8 mm end mill, then wire-cut every root to the final profile so the pitch stays within 0.02 mm over the full length.
04. Cut the Comb Slots
Set the comb on the same pitch reference and wire-cut twelve 0.9 mm slots, checking the pitch with a pin gauge before removing the part.
05. Hone, Passivate, Inspect
Hone the cutting edge to a 0.05 mm radius under a microscope, passivate both parts and inspect the tooth profile on a projector.
Send a sample of the material being cut and the blade drawing, and we will quote a matched blade and comb with the pitch set to your web.
Serrated Blade and Jaw FAQs
From 0.5 mm to 4 mm. Below 0.8 mm the tooth is wire-cut only, since an end mill that small cannot clear the chips at a production rate.
A 0.05 mm radius, checked under a 20× microscope. A true knife edge is not used because it rolls over on the first stroke in stainless.
TiN and DLC are both possible on the body, but the cutting edge is masked so the coating does not blunt it.
Yes, and it is the recommended way to buy the set. Both parts are cut from the same pitch reference so the clearance is known rather than measured afterwards.
The blade is stood on a granite plate against a dial indicator over its full length, and any deviation over 0.03 mm is corrected before passivation.
Fifty sets for a new profile, since the wire program and the edge honing fixture are made for the part.
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