Drawing Compliance: 100% precision manufacturing as per customer drawings, CAD blueprints, or physical templates, supporting DWG, DXF, and PDF formats.
Material Customization: Advanced heavy-impact alloys: H13 (1.2344), X45 (1.2767 / 45NiCrMo16), 6CrW2Si, and high-tensile LD (7Cr7Mo2V2Si) tool steel.
Geometric Features: Tailored machining of critical features including customized cutting bevel angles, specialized counterbores, and threaded bolt hole alignments.
Controlled Tolerances: Thickness within ±0.05 mm (or custom limits), flatness ≤ 0.08 mm/m, and non-standard hole-pitch deviation locked to ±0.10 mm.
Application Matching: Technical stress-relief engineering for specialized excavator scrap shears, modified mobile shears, and non-standard hydraulic recycling equipment.
This segment is dedicated exclusively to the bespoke manufacturing of custom alligator shear blades and non-standard scrap metal recycling knives. Tailored for specialized recycling facilities, heavy demolition contractors, and custom machinery builders, we translate engineering drawings (DWG, DXF, STEP, or PDF formats) into high-durability wear components.
Whether configuring specific edge angles for high-speed automated shearing or designing heavy-duty knives for non-standard excavator attachments, our machining center handles low-volume prototyping up to bulk contract manufacturing.
2. Advanced Metallurgy & Grade Mapping
Custom orders are matched with certified alloy substrates accompanied by full heat-treatment and chemical analysis logs:
Steel Grade
Standard Specification
Hardness (HRC)
Performance & Application Description
H13
DIN 1.2344 / AISI H13
50 – 54 HRC
Deployed for massive structural shearing. Recommended for thick-walled custom blade configurations where ultimate fracture toughness under extreme shear shock is mandatory.
X45
DIN 1.2767 / 45NiCrMo16
52 – 55 HRC
High-nickel (approx. 4% Ni) structural integrity steel. Exceptional for heavy demolition scrap processing involving complex torsional stress and irregular shock deflection.
6CrW2Si
~60WCrV7 (DIN 1.2550)
54 – 58 HRC
Configured for custom applications requiring stable wear resistance and superior bending strength under uniform cyclic loads.
LD
7Cr7Mo2V2Si
56 – 59 HRC
Premier cold work formulation for extreme high-frequency operations, engineered specifically to resist severe abrasive wear when processing high-strength rebar and hard metal scrap profiles.
Each custom blade undergoes a specific heat-treatment profile inside computer-controlled vacuum furnaces, balancing targeted operational surface hardness with absolute structural core integrity. All hardness values and material properties are standardized as shown in the metallurgy grade mapping table above. Additional process specifications are as follows:
H13 / X45 / 6CrW2Si: Vacuum-quenched and triple-tempered to optimized HRC ranges shown in the table to optimize shear impact energy dissipation and eliminate brittle cracking under alternating loads.
LD Tool Steel: Hardened to dedicated high HRC ranges for advanced wear environments, preserving mandatory fracture limits while maximizing edge retention.
Decarburization Elimination: Precision ground post-heat-treatment to strip the decarburization boundary layer entirely from all functional cutting bevels.
For custom retrofits on modified shear heads or worn equipment seats, tolerances are locked according to drawing specifications or engineered to the following industrial limits:
Thickness Dimensioning: Machined to custom negative gap tolerances (e.g., -0.05 to -0.15 mm) per engineering requirements or strict customer drawing specifications to compensate for deformed machine tool holders; zero/positive tolerance is not applicable for shear blade assembly.
Flatness & Parallelism: Maintained at ≤ 0.08 mm per meter to prevent structural localized gaps and ensure even pressure distribution during heavy-duty cutting cycles.
Bolt-Hole Alignment & Geometry: Counterbores, counter-sinks, and pitch configurations are machined with an internal tolerance of ±0.15 mm (or down to ±0.05 mm upon request) to match high-precision or specialized mounting assemblies.
Our engineering department provides precision reverse-engineering, dimensional mapping, and custom contract manufacturing tailored to mainstream global scrap shear brands, covering specific equipment such as McIntyre (150, 407, 500GT, 610HD, 640), Lefort (C600, C800), Mistra / Kajman (Kajman 200A, 300, 400, 600), Gensco / Harris (DTX 300RB, KAJ 800, KAJ 1000, Predator series), with full details and parameters available in the reference materials.
Q1: What file formats do you accept for custom alligator shear blade manufacturing, and what if I don’t have a digital drawing?
A: We accept standard CAD files including DWG, DXF, STEP, IGES, as well as clear dimensional PDF blueprints. If a digital drawing is unavailable, you can provide a scanned hand-drawn sketch with comprehensive dimensions (length, width, thickness, hole pitch, and hole diameters) or ship a physical worn blade sample to our engineering department for complete 3D reverse engineering and mapping.
Q2: Can you modify the cutting edge bevel angle on a custom blade to better handle thin wires or copper profiles instead of structural steel?
A: Yes. Modifying the cutting edge configuration is a core part of our customization service. For heavy structural steel, we machine a robust, blunt bevel to withstand heavy shock loads without chipping. For thin materials like copper wire or sheet aluminum, we can grind a sharper, acute bevel angle combined with tight thickness tolerances to prevent material folding or "kidding" within the knife gap, thereby improving shear cleanliness.
Q3: Why is it critical to specify whether the blade seat on my shear machine is worn or modified when ordering custom knives?
A: On older or heavily used hydraulic shears, the blade mounting pocket often warps, rusts, or undergoes on-site grinding repair, altering its factory dimensions. If we are notified of these field conditions, we can adjust the custom blade thickness tolerance to a specific negative offset (e.g., matching a tight -0.10mm clearance) to ensure smooth slot insertion, or adjust bolt hole clearances to prevent assembly misalignment on deformed shear heads.
Q4: What is the typical lead time for custom-engineered tool steel blades compared to your standard Q43 catalog items?
A: While standard Q43 series catalog replacements are dispatched directly from stock, custom-engineered blades require dedicated programming, CNC setup, bespoke machining of specific bolt layouts/bevels, and targeted vacuum heat treatment. The typical lead time ranges from 15 to 25 business days depending on the structural complexity of the drawing and the specific tool steel alloy requested (such as advanced LD steel which demands precise multi-stage tempering cycles).
Nanjing Alas International Co., Ltd. is a professional industrial tooling manufacturer focused on shear blades, bending dies, shredder blades, and custom wear parts. We offer full application engineering, material selection, setup guidance, and after-sales support to global customers. Tell us your requirements, and our engineering team will provide professional solutions for blade specification, tool life optimization, and cost-effective production.
