High-Quality CNC and Turning Parts from Suntech
Shenzhen Suntech Industrial Fasteners Co....
Shenzhen Suntech Industrial Fasteners Co. Limited is a company with a full line of production, selling, trading and importing with updated manufacturing facilities and professional technology. which mainly produces CNC parts，traditional turning parts and milling parts, and with years of manufacturing and exporting experience.
Currently, our products are sold worldwide, with 80% exported to developed European countries. Our parts are widely used in small home appliances , optical lenses, optical systems, flash lights and automotive lines etc., for example, VVT, Throttle control shaft, automobile pipe joint, optical instrument , conductive pin, terminal pin, sleeve, nipple, insert nuts, busing, fitting and plungers.
Suntech has acted in “Success starts with good services and good quality”, as well as continued innovation. The products are known as “green products” and meet international and ROHS standards. Meanwhile we can provide third-party certification if customers require them (Such as SGS report).
Our company has for sure its own core strategy and perfect business ideals and management models. Each processing will be controlled strictly to ensure the highest quality with the best price.
Frequently Asked Questions
Suntech delivers industrial-grade quality with the following hard metrics: (1) Dimensional tolerance standard ±0.01 mm (IT6) on CNC milling; ±0.005 mm (IT4) on Swiss-type turning with form tool dressing; special tight-tolerance programs ±0.002 mm on Studer OD grinding; (2) Surface finish standard Ra 1.6 as-machined; Ra 0.8 achievable with single-point diamond fly-cut; Ra 0.2 via polish or honing; (3) Flatness 0.02 mm/300mm on milled plate surfaces; roundness 0.001 mm on ground shafts; (4) Cpk 1.67 minimum on KPCs (Key Product Characteristics) for production, validated via 50-piece capability study at PPAP stage; (5) First-pass yield target 98.5% across all operations, actual rolling 12-month 99.2% as of Q1 2025. All claims are backed by ISO 17025 accredited inspection reports from our in-house lab or third-party SGS/BV per buyer request.
Full in-house process matrix covers: (1) CNC milling — 3-axis vertical, 4-axis horizontal tombstone, 5-axis simultaneous, high-speed (24k RPM) for aluminum; (2) CNC turning — flat-bed, slant-bed, multi-axis with driven tools (live milling on lathe), sub-spindle for front+back ops in one chucking; (3) Swiss-type (sliding headstock) turning — 6 Citizen Cincom machines (L12, L20, L32) with 5-axis cross/back working stations, part handling conveyor, thread whirling attachment for long-lead screws; (4) Turn-mill combination — Mazak INTEGREX j-200S for Ø25–Ø200 mm complex mill-turn parts in single setup; (5) Grinding — ID/OD/centerless/thread grinding on Studer, Supertec machines; (6) EDM — Mitsubishi MV1200R wire EDM (±0.003 mm accuracy) and EA8 sinker EDM for deep cavity, hard-alloy tool steel work.
Full material matrix stocked or available from approved mills with 3.1 certificates: (1) Aluminum alloys — 6061-T6, 6063, 7075-T6, 7050, 5052, 2024; MIC-6 cast tooling plate; (2) Stainless steels — 303, 304/304L, 316/316L, 416, 420, 440C, 17-4 PH H900, 2205 duplex; (3) Carbon / alloy steels — 1045, 4140 (42CrMo4), 4340, 8620, A36, Q355B; case hardening, carburizing & quenching available; (4) Tool / die steels — SKD11 (D2), SKD61 (H13), S136 (420ESR), SKH51 (M2) high speed steel; (5) Copper / brass alloys — C1100 pure copper, C17510 beryllium copper, C3604 brass, C36000 free machining; (6) Titanium / nickel alloys — Ti-6Al-4V Grade 5, TC4, Ti-6Al-4V ELI for medical; (7) Exotics — Inconel 718, Hastelloy C276, Monel 400, MP35N; (8) Engineering plastics — PEEK (natural and carbon-fiber filled), POM (Delrin), PTFE (Teflon), UHMWPE, PVC, PMMA (Acrylic). Non-listed materials available upon request with advance mill lead time.
Inspection infrastructure: (1) CMM — Zeiss Contura 7.7.6 (0.7 µm MPE_E accuracy), with VAST XXT tactile scanning probe; Calypso 2023 software with full GD&T; 4th rotary axis option for complex 3D inspection; (2) Vision system — Mitutoyo Quick Vision Apex non-contact 2D/3D, ±1.5 µm accuracy, programmable batch inspection; (3) Hardness — Rockwell (HRB/HRC), Brinell, Vickers microhardness tester (Mitutoyo HM-210); (4) Surface metrology — Mitutoyo Surftest SJ-410 contact profilometer (Ra/Rz/Rq); Keyence VR-5000 3D optical profiler for non-contact areal roughness Sa/Sk parameters; (5) Dimensional — 3 Mitutoyo digital micrometers (0.0001 mm), 2 height masters, bore gages, thread gages Class 6H/6g GO/NOGO sets for every standard size; (6) Material verification — Hitachi High-Tech X-MET 8000 portable optical emission spectrometer (OES) for alloy identification; (7) Environmental — 2 salt spray chambers (ASTM B117), coating thickness gage, adhesion test kit. All equipment is calibrated with certificates traceable to CNAS (China) and NIST (US) standards. Calibration records available under NDA.
Customer non-conformance handling procedure: (1) Log the complaint — notify us via email with PO number, SKU, photos, defect description, defect rate sample size; we acknowledge within 4 business hours; (2) Containment within 24h — immediate quarantine of all same-lot stock in our finished goods warehouse; we can offer expedited replacement production at overtime priority if your production line is at risk; (3) Root cause analysis — 8D report issued within 5 business days including Ishikawa diagram + 5-Why analysis performed cross-functionally by quality, process engineering, and production; (4) Corrective action — permanent fix deployed on production line with before/after Cpk validation data; (5) Recourse options — 100% rework or refund of rejected parts at customer's election; we cover return freight + replacement freight for confirmed defective lots; (6) Lessons-learned review — corrective actions summary shared in the next quarterly business review. In 2024, total confirmed customer rejects were 0.04% of shipped pieces by count (412 pieces out of 980,000 shipped), 93% resolved via replacement, 7% via credit memo.
