Scraper Picks / Rippers: Carbide Tip Size 10-30 mm diameter

Component Specifications

Definition

Scraper picks, also known as rippers, are hardened steel cutting components designed for attachment to rotating cutterheads on machinery such as roadheaders, tunnel boring machines, and surface miners. They function as the primary contact points for breaking, scraping, and removing materials like rock, asphalt, concrete, or compacted soil through a combination of impact, shear, and tensile forces. These components feature specialized geometries (e.g., conical, chisel, or radial profiles) to optimize penetration and material flow, with mounting systems (e.g., threaded, block, or quick-change) ensuring secure fixation under high dynamic loads.

Working Principle

Scraper picks operate on mechanical excavation principles: as the cutterhead rotates, the picks engage the material surface at controlled angles. The pointed or edged tip concentrates force to induce tensile cracks and brittle failure in the material. Continuous rotation and feed pressure allow sequential pick engagement, creating a scraping or ripping action that fragments and displaces material toward collection systems. The design leverages mechanical advantage through hardness differentials (pick vs. material) and optimized attack angles to minimize energy consumption while maximizing removal rates.

Materials

High-alloy steel (e.g., 42CrMo4) with carbide-tipped inserts (e.g., tungsten carbide, WC-Co) for wear resistance. Hardness: 58-62 HRC for steel bodies, 1300-1600 HV for carbide tips. Heat treatment: quenching and tempering for toughness, surface treatments like nitriding or hardfacing optional.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Weight	0.5-3.0 kg
Tip Geometry	Conical, chisel, or radial
Mounting Type	Threaded, block, or quick-change
Overall Length	80-200 mm
Shank Diameter	25-45 mm
Carbide Tip Size	10-30 mm diameter

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

Standards

DIN 22311

Parent Products

This component is used in the following industrial products

Cutterhead

The rotating front assembly of a Tunnel Boring Machine that excavates soil and rock through direct contact.

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Engineering Analysis

Risks & Mitigation

Premature wear from abrasive materials
Pick breakage due to impact overload
Poor material flow causing machine stall

FMEA Triads

Trigger: Excessive hardness mismatch between pick and material
Failure: Rapid tip wear or catastrophic fracture
Mitigation: Use material testing to match pick grade; implement regular inspection schedules

Trigger: Improper mounting torque or alignment
Failure: Pick loosening or ejection during operation
Mitigation: Follow manufacturer torque specifications; use alignment tools during installation

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Dimensional tolerance ±0.2 mm on shank diameter; hardness tolerance ±2 HRC

Test Method

ISO 6508 for hardness testing; DIN 50125 for material tensile tests; field performance monitoring

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 Scraper Picks / Rippers

Manufacturer profiles associated with Scraper Picks / Rippers.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the typical service life of a scraper pick?

Service life varies from 50 to 500 operating hours, depending on material abrasiveness, operating conditions, and pick quality. Carbide-tipped picks last longer in abrasive environments.

How do I select the right pick geometry?

Choose conical picks for hard rock, chisel picks for softer materials, and radial picks for balanced performance. Consult machine manuals and material testing data.

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.

Scraper Picks / Rippers