Attachments/Thumbs

Products & Range Coverage
A&S MACHINERY CO., LTD. delivers an extensive inventory of thumb attachments and core structural and hydraulic components to support diverse construction, demolition, mining, and recycling operations:
• Machine Compatibility: Engineered for a broad range of Caterpillar equipment—including compact/mini excavators (e.g., CAT 301.5 to 308), medium excavators (e.g., CAT 320, 325, 330), and heavy-duty mining excavators (e.g., CAT 336, 345, 349)—our attachments ensure exact physical and functional alignment with mounting points, stick geometry, and hydraulic routing for a 100% perfect match.
• Complete Systems & Parts: 1. Thumb Assemblies: Mechanical stiff-link thumbs (manual pin-fixed angles for cost-effective handling) and hydraulic single- or dual-cylinder thumbs (cab-controlled infinitely variable angles for demolition and recycling); 2. Hydraulic & Pivot Components: Heavy-duty hydraulic cylinders, balance valves, high-pressure hoses, and pivot hinges; 3. Wear & Ground Engaging Parts: High-strength cast/forged thumb tooth points, side cutter wear strips, and tooth anti-wear guards; 4. Connection & Fastening Components: High-strength alloy steel pins, greasable/maintenance-free bushings, and positioning lock pins.
• OEM & Heavy-Duty Aftermarket: We offer genuine Caterpillar parts alongside tested heavy-duty aftermarket alternatives featuring Hardox wear-resistant steel main bodies. These options cater to flexible budgets while ensuring equivalent load-bearing capacity and extended service life in extreme mining and demolition environments.

Supply Chain & Logistics
We maintain a robust operational infrastructure designed to support global heavy machinery and attachment procurement through direct supply channels, delivering reliable stock availability and rapid dispatch to build trust with international buyers.
• Ready-to-Ship Inventory: We maintain large-volume stock of high-demand mechanical and hydraulic thumb assemblies in various specifications, high-frequency replacement hydraulic cylinders, wear pin bushings, and thumb tooth points to ensure immediate order processing and rapid dispatch upon confirmation, directly minimizing equipment downtime and project delays on active demolition, mining, and construction sites.
• Global Shipping and Industrial Packaging: Our international logistics framework utilizes efficient ocean freight shipping for large-tonnage thumb main body assemblies, alongside air freight and courier express lines for urgent hydraulic cylinders, seal kits, and pin accessories, ensuring secure and efficient delivery covering core infrastructure and mining markets across North America, South America, the Middle East, Europe, Australia, and Southeast Asia.
• Anti-Corrosion and Anti-Deformation Heavy-Duty Protection Standards: We implement rigorous industrial packaging standards specifically designed for precision pin bores and hydraulic cylinder ports utilizing anti-rust oil sealing and dust-proof protection, alongside robust steel pallet fixation, multi-point tensioning, and fumigation-free wooden box sealing for heavy thumb main bodies to guarantee that products withstand long-distance ocean transport without damage.

Engineering Solutions & Technical Support
Our technical framework focuses on resolving field-level operational challenges to eliminate equipment downtime, moving beyond simple parts distribution to deliver comprehensive engineering and service capabilities.
• Application-Specific Thumb Solutions: We address common field issues in high-impact scrap recycling, heavy concrete demolition, and stone handling operations, where thumb main beams experience bending, tooth points suffer premature wear, or hinge pin bores develop looseness. We also provide professional engineering solutions, including customized Hardox high-strength wear-resistant plate reinforcement, box structure critical stress area thickening designs, and high-strength alloy tooth point upgrades.
• Hydraulic Circuit and Valve Expertise: We solve auxiliary hydraulic circuit and two-way flow configurations, flow rates, and pressure matching issues frequently encountered by global buyers when installing hydraulic thumbs on Caterpillar machines, and we provide professional guidance on plumbing modifications and balance valve setting adjustments to ensure thumb opening and closing movements operate smoothly with constant clamping force and zero shock to the machine.
• Expert Technical Support and Safety Guidelines: We provide professional technical guidance covering precision mechanical alignment and installation between thumbs and excavator sticks, regular pin greasing and maintenance protocols, hydraulic quick coupler seal inspections, and safe operation protocols. Clear warranty policies ensure complete peace of mind for global demolition contractors, scrap recycling companies, mining enterprises, and parts distributors.

Call to Action & User Experience
Optimize your material handling and demolition capabilities today by utilizing our interactive tools placed across strategic positions on our platform.
• Multi-Dimensional Intelligent Search and Filtering: Benefit from advanced search functions that support fast product filtering by Caterpillar excavator model, including CAT 320 or CAT 336, thumb type (such as mechanical stiff-link thumb or hydraulic cylinder thumb), and stick dimensions (such as stick width and pin center distance specifications), to lock onto target products instantly.
• RFQ and Proforma Invoice System: Access our fast-response interactive channels providing one-click access to formal quotations, including freight terms (such as CIF or FOB), supported by around-the-clock multi-language online customer service to help global demolition contractors, scrap recycling firms, mining enterprises, and parts distributors complete procurement efficiently.