Mining equipment OEMs and their aftermarket networks buy wear parts on machine availability, not on catalogue cycles. We machine pins, bushes, wear components and OEM specials in wear-resistant steels from 50 pieces, with heat treatment through audited partners, full material traceability, first articles in 7–15 days and a quotation within 48 hours. Shutdown windows and breakdown queues get planned around delivery promises, not the other way round.
| Pins & bushes | 4140, 42CrMo4, turned + ground |
| Wear components | Wear-resistant steels, heat-treated |
| OEM specials | Per drawing, turned + milled |
| Batch range | 50–10,000 pcs |
| Tolerance scheme | ±0.005 mm, DIN ISO 2768-mK |
| Documents | Material traceability, dimensional report |
Mining fleets plan maintenance around shutdown windows, and wear parts are the items that decide whether the window holds. Original makers price for their brand, local machining prices for its overheads, and both queues stretch when every fleet manager orders at once. The buying pattern is therefore small, urgent batches with full material traceability, ordered against dates the whole site is waiting on. The cost of a missed window is measured in production tonnes, so the buying decision is really about whose delivery promise survives contact with the shutdown calendar rather than whose catalogue price was lowest in the meeting.
We machine pins, bushes and wear components in wear-resistant steels and 4140 from 50 pieces, with heat treatment through audited partners documented in the same batch file as the dimensional report. Quote within 48 hours, first articles in 7–15 days, DDP deliveries in 5–8 days by air. Repeat orders run against your part number with identical documentation, so shutdown planning stops depending on one local shop's queue. Buffer stock on running part numbers converts emergency orders into planned call-offs after the first approved batches, and the same contact handles quoting, production and delivery from start to finish.
| Component (IT / EN) | Typical material | Process | Typical batch |
|---|---|---|---|
| Pins (销轴) | 4140, 42CrMo4 | Turning + grinding | 50–5,000 |
| Bushes (衬套) | Wear-resistant steel | Turning + grinding | 100–10,000 |
| Wear components | Wear steel, heat-treated | Turning + milling | 50–5,000 |
| OEM specials per drawing | Per drawing | Turning + milling + grinding | 50–2,000 |
Hardness and material certificates ride with every batch; local-content arguments are yours to make with our cost sheet.
The standard flow: drawing review and quotation within 48 hours, first samples in 7–15 days, first article inspection and approval, then series production against the approved reference. Tooling, program revisions and inspection records are kept on file so that call-offs remain consistent with the approved first article.
Engineering changes — material substitutions, tolerance updates, plating or packaging changes — are handled as controlled changes against the same records.
DIN ISO 2768-mK applies as the default tolerance scheme for unspecified dimensions. EN 10204 3.1 inspection certificates are standard for metallic parts, First Article Inspection supports the approval step, and RoHS/REACH declarations are available where required. Plating, cleanliness and packaging requirements are confirmed per drawing.
Can you match wear-part specifications without a drawing?
Yes. Worn parts arrive as samples and leave as reverse-engineered first articles with a full dimensional report and hardness documentation. Heat treatment runs through audited partners with records in the same batch file, and the specification we lock after your approval becomes the stored standard for every repeat order on that part number. Hardness values are reported as actual measured numbers, for example 28 to 32 HRC after treatment where specified.
How do you handle shutdown-window timing?
Quote in 48 hours, first articles in 7 to 15 days, and split-ship air DDP in 5 to 8 days so the critical fits arrive before the balance. For planned shutdowns we hold buffer stock against your call-off schedule after the first approved batches, which converts emergency machining into planned logistics.
What documentation do you provide?
Every batch carries material traceability to the certified melt, hardness documentation where heat treatment applies, and a dimensional report covering the fits you flag as critical. The identical document set repeats on every delivery so your maintenance planning files stay consistent across sites and years. Dimensional reports list actual values on every flagged fit, for example fits at ±0.005 mm reported individually.
What are your payment and delivery terms?
New relationships start with 30 percent on order and 70 percent before shipment, or an irrevocable letter of credit for framework values. Standard deliveries run DDP in 5 to 8 days by air including customs clearance, or 35 to 45 days by sea, with buffer stock available on running items after the first approved batches clear inspection.
Send your drawing — Sinbo Precision will review material, tolerance scheme and batch plan and return a quotation within 48 hours. Samples in 7–15 days.
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