Premium Materials: Forged from vacuum-quenched AISI D2 ,Cr12MoV or high-toughness AISI H13 (SKD61), engineered with localized induction hardening on core wear faces to balance impact wear. Clamping Rigidity: Built to withstand high hydraulic upsetting pressures ranging from 50 kN to 200 kN without longitudinal wire slippage under full tonnage. Coaxial Alignment: Precision CNC wire-cut V-groove geometry limits the coaxiality error between the rebar end and heading die cavity to within 0.05 mm. Surface Protection: Calibrated friction teeth lock high-tensile 1420 MPa SBPDL series bars firmly without triggering micro-fractures or surface work hardening.
Heavy-Duty PC Steel Bar Clamping Jaws for Automated Button Heading Machines
The Challenge
Hydraulic button heading of high-tensile PC bars causes extreme axial shock and crushing loads. Generic clamping blocks suffer stress cracking, cavity deformation, or gripping loss under 50 to 200 kN pressure, allowing 1420 MPa bars to slide and causing incomplete button formation or structural eccentricity.
Our Solution
ALAS manufactures heavy-duty heading machine clamping jaws forged from premium tool steels (AISI H13 / AISI D2). Processed via multi-stage vacuum heat treatment and localized induction hardening along the contact pockets, our clamps maintain stable gripping geometries on high-frequency heading carousels.
Bar Range: Drop-in fit for Φ7.1 mm, Φ9.0 mm, Φ10.7 mm, and Φ12.6 mm diameters.
Key Metric: Core coaxiality alignment error limited strictly to within 0.05 mm.
Engineering Dynamics & Technical Advantages
Precision Coaxiality Control: Precision CNC wire-cut and ground V-groove profiles restrict alignment deviation to under 0.03 mm. This eliminates material shortage during the plastic upsetting phase and forces the button head to expand concentrically with the bar axis.
Surface Scarring Mitigation: The internal clamping interface contour features calibrated friction teeth that are stress-balanced to grip the induction-hardened PC steel bar uniformly. This locks the steel bar without deep scoring, notch indentation, or localized micro-fracturing that damages the bar's tensile properties.
Rigid Anti-Deformation Matrix: The balanced core hardness and toughness of H13 / D2 steel absorb repetitive hydraulic strokes, preventing the clamping blocks from expanding laterally and ensuring standardized button-head diameters (1.5–2.0 × the bar diameter).
Technical Specification Matrix
Component Type
Substrate Metallurgy
Pocket Hardness
Target PC Steel Bar Range
Primary Engineering Function
Heavy-Duty H13 Clamping Jaw Set
Forged AISI H13 / JIS SKD61 (Vacuum-Quenched)
50–55 HRC
Φ10.7 mm and Φ12.6 mm heavy PC steel bars
Optimized for high-vibration automatic lines and heavy hydraulic loads to prevent brittle cracking.
Wear-Resistant D2 Clamping Jaw Set
Forged AISI D2 / JIS SKD11 / GB Cr12Mo1V1 (High-Carbon)
55–60 HRC
Φ7.1 mm and Φ9.0 mm standard PC steel bars
Provides maximum friction matrix and abrasive wear resistance on rigid, high-volume automated lines.
Standard Tooling Dimensions & Custom Capabilities
To ensure a precise drop-in fit with your existing automated wire blanking carousels and shearing actuators, our manufacturing window covers the following precision specifications:
Thickness Profile: Machined strictly within ±0.01 mm to maintain stable rigid seating alignment.
All custom cutter blocks are manufactured strictly to client blueprints or original equipment manufacturer (OEM) part numbers.
Matched Processing Line Consumables & Compatibility
ALAS supplies complete replacement components and offers 100% geometric interchangeability for global automated spun pile and concrete pole equipment, including brands like NCB (Japan), Taichang (South Korea), Haicheng & Haiyu (China), and mainstream carousels like Kajimoto and Skako Concrete. Cross-reference support is available by supplying machine models or blueprints.
Packaging & Anti-Rust
Treated with heavy-duty synthetic anti-rust oil, wrapped in VCI paper, vacuum-sealed in barrier bags, and shipped in ISPM-15 compliant export wooden crates with desiccant packs.
Technical FAQ & Preservation Standards
Q1: How to prevent eccentric heading?
Keep mounting slots clean with compressed air. ALAS jaws maintain alignment tolerances under 0.03 mm.
Q2: How to fix clamp slippage on Φ12.6 mm bars?
ALAS uses forged H13/D2 tool steel with induction-hardened pockets (50–60 HRC) to securely lock high-pressure bars without slipping or deep scuffing.
Frustrated with Clamp Slippage, Cavity Deformation, or Eccentric Heading on Your Button Heading Machines?
Don't let high hydraulic pressure slippage or sub-standard tool steel cracking ruin your 1420 MPa PC bar button formation. Contact the ALAS engineering team today to receive a precision-calibrated clamping blueprint (Forged H13/D2), ≤0.05mm concentricity verifications, and a factory-direct quote!
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.
