When you’re buying an excavator attachment, you’re not just buying a shape made of steel. You’re buying the decisions made at every stage of manufacturing — the steel grade specified, the weld procedure followed, the quality check applied before the product leaves the floor. Those decisions determine whether your bucket lasts 2,000 hours or 800.
We’ve been manufacturing excavator attachments in Xuzhou, China for over 17 years. This is how we build them — and why it matters to you as a buyer.
Step 1: Steel Selection — The Foundation of Everything
A bucket is only as good as the steel it’s built from. At RSBM, we use high-strength wear-resistant steel for all structural and wear-contact components. The grade is selected based on the application:
- Structural components (side plates, back plate, boom arms): high-tensile structural steel, typically 345–690 MPa yield strength
- Wear surfaces (bucket floor, cutting edge, side cutters): abrasion-resistant plate with a Brinell hardness of 400–500 HB, capable of withstanding repeated contact with rock, ore, and abrasive material
- Cutting edges and teeth adapters: heat-treated alloy steel for both hardness and impact toughness
We do not use generic mild steel on wear surfaces. The difference in service life between a bucket built with proper wear plate and one built with standard structural steel can be 3x or greater in abrasive applications.
Step 2: Precision Cutting and Forming
Once material is selected, steel plates are cut to exact dimensions using CNC plasma and laser cutting systems. This ensures that every component — side plate, floor panel, mounting bracket — is cut to tight tolerances before fabrication begins.
Formed components (such as curved bucket floors and boom arms) are shaped using hydraulic press brakes, again CNC-controlled to maintain consistent geometry across production runs. Precision at this stage is what ensures that pin dimensions and mounting interfaces match your machine exactly — not approximately.
Step 3: Fit-Up and Assembly
Cut and formed components are assembled in precision jigs that hold everything in exact position during welding. This is a step that low-cost manufacturers frequently skip or rush — and it shows in the finished product. Mis-aligned components lead to stress concentrations, premature cracking, and poor fit on the machine.
Every RSBM attachment is jigged to the specific machine model it’s built for, using dimension data sourced directly from OEM specifications for Komatsu, Caterpillar, Hitachi, Volvo, Hyundai, Kobelco, Liebherr, and others.
Step 4: Welding — Where Quality Is Won or Lost
Welding is the most critical manufacturing step for any structural steel attachment. At RSBM, our welding team follows strict procedures:
- Full-penetration welds at all primary stress points — not fillet welds that only bond the surface
- Multi-pass welding on thick-section joints to ensure full fusion and eliminate voids
- Preheat protocols for high-carbon and alloy steels to prevent hydrogen cracking
- Qualified welders trained to AWS and ISO standards, with regular certification reviews
Welds are visually inspected 100%, with ultrasonic testing (UT) applied to critical structural joints on heavier attachments. Poor welds are the single most common failure mode in budget attachments — this is where we don’t cut corners.
Step 5: Finishing, Inspection, and Dispatch
After welding, attachments go through:
- Grinding and cleaning of all weld surfaces
- Shot blasting to prepare the surface for coating
- Primer and topcoat application — typically 2-coat epoxy system for corrosion protection
- Final dimensional inspection — pin bore diameters, mounting face geometry, and overall dimensions checked against the order specification
- Load and function testing where applicable (hydraulic components, quick couplers)
Only after passing final inspection is an attachment cleared for packing and dispatch. Our standard lead time from order confirmation is 25–30 days, with shipping to major ports worldwide.
What This Means for You as a Buyer
Understanding how an attachment is built tells you what questions to ask any supplier:
- What steel grade do you use on wear surfaces?
- Are joints fully penetrated or fillet welded?
- Do you use assembly jigs for dimensional consistency?
- What QC steps happen before dispatch?
If a supplier can’t answer these questions clearly, the manufacturing process probably doesn’t support clear answers.
At RSBM, we can walk you through every step — and back it up with material certificates, weld procedure specifications, and dimensional inspection reports on request.
See It for Yourself
We welcome factory visits from serious buyers. If you’re evaluating suppliers and want to inspect our facility, production processes, and quality systems in person, we’ll arrange it.
Otherwise, the next step is simple: tell us your machine, your application, and your required specifications — and we’ll quote you a factory-direct price within 24 hours.
👉 Browse our full attachment range — or contact us directly to start a conversation about your requirements.
