Sheet Metal OEM/ODM on the Line That Builds Our Racks
Contract sheet metal on the same floor — and the same six processes — that build RackForge racks, which means the capability is not borrowed from a subcontractor's schedule. Drawings come in under NDA, DFM notes come back within 48 hours, first articles are proved on a CMM against a ballooned drawing, and every batch carries traceable material certificates. The window is 0.8–3.0 mm in SPCC, SGCC, SUS304 and AL5052, held to a ±0.1 mm fabrication tolerance from laser cutting through final assembly, with a C4-class powder system at 80–100 µm validated to 480 hours of neutral salt spray. Samples in 15 days, production in 30, FOB Qingdao.
Request a Quotation Jump to Process Parameters
±0.1 mm · 0.8–3.0 mm · C4 coating · 480 h NSS
Six commitments written into every drawing package
OEM work fails on communication, not on machines. The six items below are written into the quotation itself, so both sides know what "done" means before the first sheet is cut.
Drawing NDA — signed before your files are opened; DXF, DWG and STEP accepted, and the NDA covers tooling, programs and rejects alike.
NDA firstDFM feedback in 48 hours — bend radius, hole-to-edge distance and tolerance-stack notes redlined on your drawing by the engineer who will run the job.
48 h replyFirst-article CMM report — three-coordinate measurement against a ballooned drawing, filed with the run and re-issued whenever the revision changes.
CMM · FAIBatch traceability — coil certificates and run batch IDs kept per order, with a silk-screened ID zone on each structural part tying it to its batch.
batch ID zoneFabrication tolerance ±0.1 mm — held from laser cutting through bending and final assembly, checked on shop fixtures and logged at first article.
±0.1 mmC4 coating system — four-stage pretreatment and electrostatic powder at 80–100 µm, with production batches validated to 480 h neutral salt spray (ISO 9227).
C4 · 480 hSix processes under one roof, six places you stay in the loop
Walk the part through the shop in the order the steel sees it. Each step names what we do and what we need from you to keep the run on its 30-day slot.
Laser cutting
Fiber laser nesting minimizes scrap and holds ±0.05 mm positioning repeatability, with burrs broken before anything reaches forming. Common IT vent patterns cut clean at 1.0 mm and above. Your input: DXF or DWG files with 1:1 flat patterns, or a STEP model we flatten for you.
CNC punching
The turret punch forms louver vents, knockouts, countersinks and card guides in one hit, which is faster than laser for repeatable hole fields. Our tooling library covers the vent patterns used across server racks and containment panels. Your input: hole and vent callouts with tolerances marked on the drawing.
Bending
CNC press brakes hold ±0.1 mm on repeat bends, with minimum inner radii set per material to avoid orange-peel on AL5052 and tearing on SUS304. Gauging jigs keep bend angles consistent across the batch, not just across the first sheet. Your input: approval of the bend sequence proposed on the DFM sheet.
Welding
TIG on SUS304, MIG on frames and spot welding for panel assemblies; cosmetic welds are ground to the finish class your drawing calls out. Weld distortion is controlled with fixture-cooled sequences on thin-gauge parts. Your input: weld-on and weld-off marks plus the cosmetic-face list.
Powder coating
Four-stage pretreatment — degrease, pickle, phosphate, rinse — feeds an electrostatic powder line at 80–100 µm, rated C4 and validated to 480 h neutral salt spray per batch. Masking keeps threads and grounding points bare. Your input: RAL code, gloss level and masking points.
Assembly & first article
Hardware insertion, sub-assembly and final torque checks close the run, and the CMM first-article report is issued against the ballooned drawing before packing. Export plywood crates or CKD flat-pack follow your distribution plan. Your input: fastener specification and preferred packing format.
The capability window, as quoted
Everything below is quotable as standard. Outside the window — heavier gauge, other alloys, wet paint or plated finish — is quoted as an engineering case after the 48-hour DFM review, not refused.
| Parameter | OEM Capability |
|---|---|
| Materials | SPCC · SGCC · SUS304 · AL5052 |
| Thickness range | 0.8–3.0 mm |
| Fabrication tolerance | ±0.1 mm, laser cutting through final assembly |
| Laser positioning repeatability | ±0.05 mm |
| Hole accuracy | ±0.1 mm punched · ±0.05 mm laser-cut |
| Minimum inner bend radius | 1.0 t SPCC/SGCC · 1.5 t SUS304 · 2.0 t AL5052 |
| Welding processes | TIG · MIG · spot; SUS304 TIG standard |
| Pretreatment | degrease → pickle → phosphate → rinse |
| Coating | electrostatic powder, 80–100 µm nominal |
| Coating class | C4 (ISO 12944-2) |
| Salt spray | 480 h NSS (ISO 9227), batch-validated |
| First article | CMM report with ballooned drawing |
| Traceability | coil certificates + run batch IDs, silk-screened zones |
| File formats | DXF · DWG · STEP |
| Trade terms | MOQ 5/part number · 1-piece prototypes · sample 15 days · production 30 days · FOB Qingdao · T/T · L/C |
Every order ships with its CMM report, material certificates and the signed NDA on file — the paper trail travels with the steel.
Send the drawing. Meet the first article.
±0.1 mm · C4 coating · DFM reply in 48 hours under NDA
