Knife Spacers: Thickness Tolerance ±0.001 mm

Component Specifications

Definition

Knife spacers are precision-engineered components used in slitting heads to maintain consistent and accurate spacing between cutting blades. They ensure proper blade alignment and prevent contact between adjacent blades during operation, enabling clean, precise cuts in materials like paper, film, foil, and textiles. These spacers are critical for achieving uniform slit widths and preventing blade damage.

Working Principle

Knife spacers work by providing a rigid, precisely dimensioned barrier between adjacent blades in a slitting head. They absorb axial forces during cutting operations, maintain blade parallelism, and ensure consistent slit widths by preventing blade deflection or misalignment. Their thickness determines the exact spacing between blades, directly controlling the width of material strips produced.

Materials

Typically made from hardened tool steel (AISI D2, A2), stainless steel (440C, 17-4PH), or tungsten carbide for high-wear applications. Surface treatments include nitriding, chrome plating, or TiN coating to enhance wear resistance and reduce friction.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Flatness	0.0015 mm max
Hardness	58-62 HRC
Parallelism	0.002 mm max
Inner Diameter	Fits arbor diameter
Outer Diameter	Matches blade bore size
Surface Finish	Ra 0.2 μm max
Thickness Tolerance	±0.001 mm

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 2768-mK, DIN 7150, ISO 8015

Parent Products

This component is used in the following industrial products

Precision Slitting Head

A precision cutting assembly for battery electrode slitting machines, used to longitudinally cut coated electrode foils into narrow strips.

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Engineering Analysis

Risks & Mitigation

Incorrect spacing leading to uneven cuts
Wear causing blade misalignment
Material buildup between spacers
Improper installation damaging blades
Corrosion in humid environments

FMEA Triads

Trigger: Wear from abrasive materials
Failure: Reduced thickness causing narrow slits
Mitigation: Use hardened materials with coatings; implement regular thickness checks

Trigger: Improper cleaning
Failure: Material buildup affecting spacing accuracy
Mitigation: Establish cleaning procedures; use anti-stick coatings

Trigger: Over-tightening during assembly
Failure: Deformation or cracking of spacers
Mitigation: Use torque wrenches; follow manufacturer tightening specifications

Trigger: Corrosion in wet environments
Failure: Pitting and dimensional changes
Mitigation: Use stainless steel or coated spacers; control environment humidity

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 2768-mK, thickness tolerance ±0.001mm, parallelism within 0.002mm

Test Method

Coordinate measuring machine (CMM) verification, surface roughness testing, hardness testing per ISO 6508

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Knife Spacers

Manufacturer profiles associated with Knife Spacers.

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Frequently Asked Questions

What is the primary function of knife spacers in a slitting head?

Knife spacers maintain precise spacing between cutting blades, ensuring consistent slit widths and preventing blade contact during operation.

How do I select the right thickness for knife spacers?

Select thickness based on desired slit width minus blade thickness. Consult machine specifications and consider material thickness variations.

Can knife spacers be reused after blade replacement?

Yes, if undamaged and within tolerance. Always inspect for wear, scoring, or deformation before reuse.

What materials are best for high-speed slitting applications?

Tungsten carbide or hardened tool steel with wear-resistant coatings provide best performance for high-speed or abrasive materials.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Knife Spacers