📍 Anhui Province, China 📞 +86 155 5177 6915
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Factory Direct

Long Straight & Shearing Knives Manufacturer

Long machine knives for guillotine paper cutters, three-knife trimmers, shearing machines, crocodile shears and scrap cutters. Lengths up to 4,500 mm single piece, straightness within 0.1 mm per metre.

Long & Shearing Knives — guillotine blade, factory direct

Key features

  • Lengths up to 4,500 mm, single-piece — no joint, no weak point
  • Straightness within 0.1 mm per metre over the full length
  • Parallel edges: two usable cutting edges per knife
  • HSS and carbide-tipped versions for abrasive coated board
  • Matched sets for three-knife trimmers

Specifications

MaterialCr12MoV, SKD-11 (D2), 9CrSi, HSS M2, HSS with carbide tip
HardnessHRC 56–62 (body); HRC 64–66 (carbide tip)
LengthUp to 4,500 mm single piece
Width40 – 200 mm
Thickness6 – 25 mm
Straightness≤ 0.1 mm / m
Edge angle17° – 24° (paper); 30° – 45° (board)
SurfaceGround and polished; optional Teflon coating for sticky stock
Heat treatmentVacuum quench + double temper
MOQ1 pc (sample) / 5 pcs (batch)

Applications

Sheet-fed guillotines

Single-sheet paper cutters of all makes.

Metal sheet shearing

Guillotine and swing-beam shears for plate, sheet and scrap.

Three-knife trimmers

Bookbinding and print finishing lines.

Tissue & towel converting

Log saw and perforation knives.

Corrugated board

Sheeter and cut-off knives for corrugated lines.

Blade types we make in this line

A partial list — if you do not see your blade, send us the drawing or a photo and we will confirm.

Guillotine paper knivesThree-knife trimmer bladesShearing machine bladesCrocodile shear bladesCombined punch & shear bladesRebar cutting bladesScrap steel shear bladesInlaid-steel crosscut knivesHSS long straight knivesCoated long knives

Fitting your machine, and buying a replacement

We make replacement guillotine and shear blades for paper cutters including Polar Mohr, Perfecta, Wohlenberg, MBM Triumph, Ideal and EBA models, and for hydraulic and mechanical shearing machines cutting steel plate, scrap and non-ferrous metal. If you have the old knife, the length, width, thickness and slot pattern are all we need to quote a replacement.

Also called: paper cutting knife · shearing machine blades · shear blades · straight knife blade · paper trimmer blade replacement · replacement knife for Polar guillotine.

Materials used for this blade

Cr12MoV
HRC 58–62 · High

Widely used, well understood grade. Good balance of cost and life.

Read the full grade guide
SKD-11 (D2)
HRC 60–64 · Very high

Longer life than Cr12MoV at higher cost. The default upgrade.

Read the full grade guide
9CrSi
HRC 56–60 · Medium-high

Economical and forgiving. Common for large straight knives.

Read the full grade guide
HSS M2 / M42
HRC 62–66 · Very high

M42 (cobalt) for heat resistance at very high line speeds.

Read the full grade guide

Frequently asked questions

Yes — we produce single-piece knives up to 4,500 mm. Long knives are the reason straightness matters: a knife that bends will leave a step in the cut. We verify straightness on a granite surface plate and ship with a dimensional report.
A standard 12.7 mm thick knife in Cr12MoV can normally be resharpened 8–12 times before it reaches minimum width. HSS and carbide-tipped knives take more regrinds and hold their edge longer between services. We can advise the minimum safe width for your holder.
Yes. Send the length, width and thickness of your current knife, or a photo of the blade with a ruler next to it. We follow the original mounting slot pattern and bolt hole positions.
Almost always one of three things: a dull edge, an incorrect clamp pressure, or a knife that has lost its bevel angle through repeated sharpening at the wrong angle. Send us a photo of the edge and we can usually identify which. Our knives ship with the bevel angle marked so your grinding shop can restore it correctly.
Yes. Tell us the cutter brand and model, or measure the knife you are using — length, width, thickness, edge angle and the position of the fixing slots. We grind to those figures, so the blade drops straight into the clamp.
Yes. A worn blade is often the best drawing there is. Send it by courier, we measure it, and quote from the measured dimensions. We can also work from an OEM part number.

Not sure which blade fits?

Send a photo of the blade you use now with a ruler next to it. We will tell you the grade and the edge angle.

Ask us