Quality Assurance

Quality Inspection Process

Inspection flow runs from incoming raw material to outgoing shipment: Incoming inspection, first-article inspection, in-process inspection and out-going inspection, with documented records for traceability.

Quality Control Flow

Checked at every step, not just before shipment.

From incoming raw material to delivered parts, every stage has a defined inspection gate with a clear pass/fail rule. Records are kept at each gate so every part can be traced.

01

Incoming Inspection

Material certificates, grade, dimensions and surface are verified against the order before material enters production.

CNC Incoming Inspection Record (IQC)
Material Name6061-T6 Aluminum Plate (incoming)
Spec / StdGB/T 3880.2 · 12×300×400
Supplier / P.O.—
Material6061
StageIQC (Incoming)
Heat No. / QtyAL6061-2609-07 · 1 sheet ≈3.9kg
Date2026-09-14
InspectorLi Wenbo
LocationIQC Receiving Area
Doc No.IQC-2609-014
Ref.QM-IQC-03 Incoming Inspection Spec
Environment21.5℃ / 55%RH
No.CodeInspection ItemAcceptance Ref. / StdDef. ClassMethodActual RecordResult
1C-01Hardness (base)GB/T 230.1 / 231.1 / 4340.1; drawingMASamplingSampled 1 sheet, 4 pts, GB/T 231.1 Brinell (F=1471N,D=10mm): 96.5/97.0/95.5/96.0 HBW, avg 96.3 HBW (reject <90)√
2D-01Material grade confirm (PMI)Drawing gradeCRSamplingHandheld XRF (Niton XL3t) 3 pts: Si0.58/Fe0.21/Cu0.26/Mn0.05/Mg1.02/Cr0.19/Zn0.03/Ti0.02, bal Al → 6061√
3D-02Material cert (MTC/Cert)EN 10204 3.1/3.2; GB/T 247MA100%MTC No.AL-26090712 (EN 10204 3.1): 6061-T6, heat AL6061-2609-07; Rm312/Rp0.2 276/A12.5% (≥290/≥240/≥8); composition matches PMI; archived√
4D-03Heat no. traceabilityISO 9001 8.5.2MA100%Label heat AL6061-2609-07 matches MTC; WH entry RK-2609-14 recorded; plate inkjet clear, no mix√
5E-01Product ID (PN/name)Drawing / orderMA100%6061-T6 plate 12×300×400, PN YL-6061-12, matches PO-260907-04 & delivery note√
6E-03Material/temper labelProcess cardMA100%Label 6061-T6 matches PMI & MTC; intact, no alteration√
7E-06NCR segregationISO 9001 8.7MA100%Lot conforms, no NC; isolation red tag & bin in place, no NCR records this period√
Result☑ Conform □ Non-conform Abnormal No.: None
InspectorLi Wenbo
ReviewedZhang Mingyuan
ApprovedZhou Jianguo
IQC incoming inspection record · click to enlarge
02

First Article (FAI)

The first part is checked on critical dimensions and appearance before the batch is released.

CNC First Article Inspection Record (FAI)
Product NameTransmission Bracket (pilot run)
Drawing No.MK-BR-0427 Rev.B
Customer / Order—
Material6061
StageFAI (First Article)
Batch / QtyB2609-013 · 2 pcs
Date2026-09-16
InspectorChen Jiayi
Machine / OpCNC-03 · OP10~OP80
Doc No.FAI-2609-013
Ref.CP-MK-0427 Rev.B
EnvironmentMetrology rm 20.4℃ / 52%RH
No.CodeInspection ItemAcceptance Ref. / StdDef. ClassMethodActual RecordResult
1A-01Linear dims (L/W/H/depth)Drawing tol.; unspecified GB/T 1804-m / ISO 2768-mMA100%2 pcs full-check, mic+CMM: L80.012/80.006, W45.006/44.994, H12.008/11.996mm (80.00±0.05 / 45.00±0.05 / 12.00±0.03)√
2A-02Hole dia (thru/blind/step)Drawing; GB/T 1804MA100%Air gauge+ID mic: main Φ25.011/25.008 (Φ25H7 +0.021/0); 4×Φ4.5 = 4.545~4.553mm (+0.10/0)√
3A-03Hole dist / position / marginGB/T 1958 (position)MA100%CMM (Hexagon Global S): dist 40.013/40.008 (40.00±0.05); margin 8.04,7.98/8.02,7.96mm (8.00±0.10)√
4A-04Position toleranceGB/T 1184 / ASME Y14.5MA100%CMM by A|B|C datums: main hole 0.031/0.027; Φ4.5 group 0.038~0.045mm (tol Φ0.08)√
5A-05FlatnessGB/T 1958MA100%CMM scan base (datum A): 0.018/0.015mm (drawing 0.05/full length); optical flat ≤0.02√
6A-06StraightnessGB/T 1958MI100%0-grade straightedge+feeler: side rail gap 0.015/0.012mm in 100mm (0.03/100)√
7A-07PerpendicularityGB/T 1958MA100%CMM: main hole axis to datum A 0.012/0.010mm (0.03); square+indicator 0.015√
8A-08ParallelismGB/T 1958MA100%Indicator (datum A): side faces 0.008/0.006mm (0.02)√
9A-09Concentricity/coaxialityGB/T 1958MA100%Runout tester: main hole vs counterbore 0.009/0.007mm (Φ0.02)√
10A-11Profile line/surfaceGB/T 1958 / ASME Y14.5MASampling1 pc (SN-01) CMM scan vs CAD: max 0.052mm (tol 0.10), no concentrated out-of-tol√
11A-13Circular/total runoutGB/T 1958MA100%V-block+indicator: main hole radial runout 0.011/0.009mm (0.03)√
12A-15Wall thickness (thin-wall)DrawingMA100%Ultrasonic 3pts/pc+mic: 1.49/1.52/1.50, 1.51/1.48/1.52mm (1.50±0.10)√
13A-16Thread (go/no-go)GB/T 197 / ISO 965 (6H/6g)MA100%M4×0.7-6H plug, 2 pc 4 holes: go all to bottom, no-go ≤1.5/1 thread (≤2)√
14A-19Counterbore dia/depthDrawingMI100%Depth mic+plug: CB Φ8.03/8.01, 8.02/8.04 (Φ8.00 +0.10/0); depth 3.18/3.22, 3.19/3.21mm (3.20±0.10)√
15A-20Keyway width/symmetry/depthGB/T 1095 (parallel key)MA100%Keyway plug+CMM: W3.005/3.002 (3.00 JS9 ±0.013); D1.83/1.79 (1.80±0.10); L12.04/11.98 (12.00±0.10); symm 0.018/0.014 (0.05)√
16A-22Datum consistencyProcess file / drawingMA100%Process card CNC-0427 Rev.B: datum A (base)/B (Φ25 main)/C (end face) match drawing; CMM datum verified√
17B-01Burr / flashLimit sample; customer specMI100%2pc visual+feel vs limit sample (5×): burr ≤0.03mm (≤0.10); holes chamfered, no flash√
18B-05Residue / unmachined / missed opRouting cardMA100%2pc vs routing OP10~OP80 (8 ops): card signed, no missed; no residue in keyway root/counterbore bottom√
19B-14Stripped/broken threadGB/T 197MA100%2pc 4 M4 holes, go-no-go+5×: profile complete, no broken/stripped thread, no lip√
20B-15Assembly interference/loosenessAssembly drawingMA100%Trial-fit with cover MK-CV-0426: alignment ok, no interference; fixture JG-0427 no play, no wobble√
21C-07Assembly fit (trial)Assembly drawingMA100%Φ25 main hole vs bearing seat: smooth push, clearance 0.008~0.011mm (0.005~0.020), no bind√
22E-01Product ID (PN/name)Drawing / orderMA100%First-article tag: PN MK-BR-0427, name, Rev.B, matches PO-260917-04; 2 pc marked "pending first-article"√
23E-06NCR segregationISO 9001 8.7MA100%FAI conforms, no NC; red tag in place; released to mass production, "pending" mark removed√
Result☑ Conform (first article released) □ Non-conform Abnormal No.: None
InspectorChen Jiayi
ReviewedZhang Mingyuan
ApprovedZhou Jianguo
FAI first-article report
03

In-Process (IPQC)

Key processes are checked continuously; any anomaly stops the line for correction.

CNC In-Process Inspection Record (IPQC)
Product NameTransmission Bracket (pilot run)
Drawing No.MK-BR-0427 Rev.B
Customer / Order—
Material6061
StageIPQC (In-Process)
Batch / QtyB2609-013 · 6 pcs
Date2026-09-17 ~ 09-18
InspectorWang Haitao
Machine / OpCNC-03 · OP30~OP70
Doc No.IPQC-2609-017
Ref.CP-MK-0427 Rev.B
EnvironmentWorkshop 24.5℃ / 58%RH
No.CodeInspection ItemAcceptance Ref. / StdDef. ClassMethodActual RecordResult
1A-16Thread (go/no-go)GB/T 197 / ISO 965 (6H/6g)MA100%3 rounds (09-17 10:20, 09-17 14:05, 09-18 09:40), 2pc/round, 6pc 12 holes: M4×0.7-6H go all seated, no-go 0~1.5 thread√
2B-01Burr / flashLimit sample; customer specMI100%3 rounds, 2pc each, visual+feel: burr 0.02~0.05mm (≤0.10); no flash at keyway ends√
3B-05Residue / unmachined / missed opRouting cardMA100%3 rounds routing OP30→OP70 checked per process: cards signed continuous; no residue in keyway root, M4 hole bottom clean√
4B-08Burn / discoloration (thermal)Customer specMA100%3 rounds, 40W visual: no burn/discoloration, uniform silver finish; coolant conc. 8.2% (std 7~10%)√
5B-14Stripped / broken threadGB/T 197MA100%6pc 12 holes go-no-go+5×: profile complete; tap T05 180 holes (limit 200), tool-change note HD-2609-06 issued, 2pc recheck OK√
6E-01Product ID (PN/name)Drawing / orderMA100%WIP card PN MK-BR-0427, batch B2609-013 match part; card XL-2609-05 continuous, machine/op filled√
7E-06NCR segregationISO 9001 8.7MA100%No NC during patrol; red tag & bin in place, no residue; HD-2609-06 closed√
Result☑ Conform □ Non-conform Abnormal No.: None
InspectorWang Haitao
ReviewedZhang Mingyuan
ApprovedZhou Jianguo
IPQC in-process inspection record
04

Final Inspection (FQC)

Finished parts are checked on critical dimensions, appearance, function and cleanliness before they are accepted for shipment.

CNC Finished-goods Inspection Record (FQC)
Product NameTransmission Bracket (pilot run)
Drawing No.MK-BR-0427 Rev.B
Customer / Order—
Material6061
StageFQC (Finished-goods)
Batch / QtyB2609-013 · 20 pcs
Date2026-09-21
InspectorChen Jiayi
Machine / StationFQC final inspection · post OP80
Doc No.FQC-2609-021
Ref.CP-MK-0427 Rev.B
EnvironmentMetrology rm 20.6℃ / 52%RH
No.CodeInspection ItemAcceptance Ref. / StdDef. ClassMethodActual RecordResult
1A-01Linear dims (L/W/H/depth)Drawing tol.; unspecified GB/T 1804-m / ISO 2768-mMA100%20pc full-check caliper/mic + CMM 5pc: L80.002~80.038, W44.971~45.026, H11.986~12.014mm (80.00±0.05/45.00±0.05/12.00±0.03); caliper vs CMM ≤0.005√
2A-02Hole dia (thru/blind/step)Drawing; GB/T 1804MA100%20pc air gauge: main Φ25.004~25.017 (Φ25H7 +0.021/0); 4×Φ4.5×20=80 holes Φ4.531~4.572 (+0.10/0) all in tol√
3A-03Hole dist/position/marginGB/T 1958 (position)MA100%20pc CMM: dist 39.982~40.021 (40.00±0.05); margin 7.94~8.06mm (8.00±0.10)√
4A-04Position toleranceGB/T 1184 / ASME Y14.5MA100%20pc CMM A|B|C: main hole 0.018~0.036, Φ4.5 group 0.025~0.048mm (tol Φ0.08)√
5A-05FlatnessGB/T 1958MA100%20pc CMM scan base A: 0.009~0.021mm (0.05/full length)√
6A-06StraightnessGB/T 1958MI100%20pc 0-grade straightedge+feeler: side rail 0.008~0.017mm/100mm (0.03/100)√
7A-07PerpendicularityGB/T 1958MA100%20pc CMM: main axis to A 0.007~0.015mm (0.03)√
8A-08ParallelismGB/T 1958MA100%20pc indicator A: side faces 0.004~0.011mm (0.02)√
9A-09Concentricity/coaxialityGB/T 1958MA100%20pc runout tester: main vs counterbore 0.005~0.013mm (Φ0.02)√
10A-10Roundness/cylindricityGB/T 1958MASampling4pc (SN-03/-08/-14/-19) roundness machine min-zone: round 0.003~0.006 (0.010); cylindricity 0.005~0.009 (0.015)√
11A-11Profile line/surfaceGB/T 1958 / ASME Y14.5MASampling4pc CMM vs CAD: 0.031~0.058mm (0.10), no concentrated out-of-tol area√
12A-13Circular/total runoutGB/T 1958MA100%20pc V-block+indicator: main hole radial runout 0.006~0.014mm (0.03)√
13A-14Angle / taperGB/T 1958MASampling5pc universal protractor+CMM: rib 59.92°~60.09° (60.00±0.25°); guide 14.95°~15.04° (15.00±0.10°)√
14A-15Wall thickness (thin-wall)DrawingMA100%20pc ultrasonic+mic 3pts/pc=60: 1.46~1.54mm (1.50±0.10)√
15A-16Thread (go/no-go)GB/T 197 / ISO 965 (6H/6g)MA100%20pc 40 holes M4×0.7-6H: go all seated, no-go 0~2 threads (≤2)√
16A-17Thread pitch dia/profileGB/T 197MISampling4pc thread mic+CMM: M4×0.7-6H pitch dia 3.689~3.736 (3.663~3.781); flank 60.0°~60.3°, complete√
17A-18Chamfer / radiusDrawingMI100%20pc chamfer/R gauge+projector: C0.5 ×14 each measured C0.46~0.55 (C0.50±0.10); R2.00 R1.96~2.08√
18A-19Counterbore dia/depthDrawingMI100%20pc depth mic+plug: Φ8.01~8.07 (Φ8.00 +0.10/0); depth 3.14~3.26mm (3.20±0.10)√
19A-20Keyway width/symmetry/depthGB/T 1095 (parallel key)MA100%20pc keyway plug+CMM: W2.992~3.009 (3.00 JS9 ±0.013); D1.74~1.86 (1.80±0.10); symmetry 0.009~0.024 (0.05)√
20A-21Unspecified toleranceGB/T 1804(f/m/c/v) / ISO 2768MI100%20pc per GB/T 1804-m, 12 spots each (6 linear, 2 angle, 4 chamfer): max +0.08mm (m-grade ±0.1~±0.3) all conform√
21B-01Burr / flashLimit sample; customer specMI100%20pc visual+feel 5×: burr 0.01~0.05mm (≤0.10); no flash at holes/keyway/root√
22B-02Sharp edge/cornerDrawing R req.MI100%20pc visual+scratch paper: sharp edges broken C0.5 ×14 each chamfered; no hook, smooth; R2.00 transition smooth√
23B-03Scratch/dent/impactAppearance grading: A none / B minor / C relaxedMA100%20pc 40W, 30~50cm: A none; B 2× L0.3mm (≤1.0 non-dense); C 3× ≤0.5mm (relaxed)√
24B-04Tool/vibration/step marksCustomer appearance specMI100%20pc visual+roughness: mill face Ra1.6, non-fit Ra3.2; no chatter; step height diff ≤0.02mm√
25B-05Residue/unmachined/missed opRouting cardMA100%20pc vs routing: OP10~OP80 8 ops complete, cards signed; keyway root/counterbore bottom/thin-wall inside no residue√
26B-06Corner/root cleaningDrawingMI100%20pc visual+feeler R2.00: no residue at root; keyway ends cleaned, natural arc, no stress concentration√
27B-07Hole chamfer / tap chip removalProcess requirementMI100%20pc visual+needle+compressed air: 4×Φ4.5 & 2×M4 chamfered; no chips in holes, needle clear√
28B-08Burn/discoloration (thermal)Customer specMA100%20pc 40W: no burn/discolor (blue/purple/tan); uniform silver; thin-wall & keyway root no thermal damage√
29B-09Cleanliness (chips/oil/foreign)ISO 16232 / VDA 19; medical specialMA100%20pc white-cloth + 5pc ultrasonic weigh: no visible chips/oil; impurity 0.6~0.9mg/pc (≤5mg ISO 16232)√
30B-10Appearance gradingCustomer appearance mapMI100%20pc vs MK-QS-011 item by item: A 0 defects; B 2× ≤0.3mm (≤1.0); C 3× ≤0.5mm (relaxed) → conform√
31B-13Marking/laser code (PN/trace)Drawing / traceability specMA100%20pc laser: PN MK-BR-0427, batch B2609-013, SN SN2609013-01~20, height 1.5mm; scanned match list, clear√
32B-14Stripped/broken threadGB/T 197MA100%20pc 40 M4 holes go-no-go+visual: profile complete; new tap T05 62 holes, no anomaly√
33C-01Hardness (base)GB/T 230.1 / 231.1 / 4340.1; drawingMASampling4pc (SN-03/-08/-14/-19) GB/T 231.1 3pts each: 95.5~97.5 HBW avg 96.4 (≥90); no soften after machining√
34C-10Dimension stability (aging re-test)Process fileMASamplingNatural aging 48h 23±2℃, 4pc: Φ25H7 +0.003~+0.005, dist40 +0.004~+0.007, flatness ≤0.004 (limit ≤0.010) → conform√
35D-03Heat no. traceabilityISO 9001 8.5.2MA100%Chain: heat AL6061-2609-07 (MTC AL-26090712)→WH RK-2609-14→cut XL-2609-05→CNC-03→op Wu Cheng/Zheng Kai→batch B2609-013→SN01~20, no gap√
36E-01Product ID (PN/name)Drawing / orderMA100%20pc labels: PN MK-BR-0427, name, 20pcs, batch B2609-013, match PO-260917-04; position uniform√
37E-02Batch / serial no.Traceability specMA100%Scan 20 SN SN2609013-01~20 unique, no dup/gap; batch matches routing card XL-2609-05√
38E-03Material/temper labelProcess cardMA100%Label 6061-T6 matches IQC PMI & MTC; 2pc hardness recheck 96.0/96.5 HBW, no anneal soften after machining√
39E-04Record completenessISO 9001 9.1; control planMA100%IQC-2609-014 (09-14), FAI-2609-013 (09-16), IPQC 3 rounds (09-17~18), this FQC (09-21) signed; CP-MK-0427 Rev.B all items recorded√
40E-06NCR segregationISO 9001 8.7MA100%20pc all conform, no NC; finished isolation area markers intact, no NCR records√
Result☑ Conform □ Non-conform Abnormal No.: None
InspectorChen Jiayi
ReviewedZhang Mingyuan
ApprovedZhou Jianguo
FQC finished-part inspection record
05

Outgoing Inspection (OQC)

Quantity, packaging, rust prevention, labels and accompanying documents are verified before the shipment leaves.

CNC Outgoing Inspection Record (OQC)
Product NameTransmission Bracket (pilot run)
Drawing No.MK-BR-0427 Rev.B
Customer / Order—
Material6061
StageOQC (Outgoing)
Batch / QtyB2609-013 · 20 pcs / 2 boxes
Date2026-09-23
InspectorLiu Siyuan
Machine / StationOQC shipping area · Packing
Doc No.OQC-2609-023
Ref.CP-MK-0427 Rev.B
EnvironmentPacking area 23.8℃ / 55%RH
No.CodeInspection ItemAcceptance Ref. / StdDef. ClassMethodActual RecordResult
1B-03Scratch / dent / impactAppearance grading: A none / B minor / C relaxedMA100%20pc pre-ship visual 40W, 30~50cm: A none; B 2× ≤0.3mm (≤1.0); C 3× ≤0.5mm; matches FQC, no new damage√
2B-09Cleanliness (chips/oil/foreign)ISO 16232 / VDA 19; medical specialMA100%20pc white-cloth wipe+air blow: no chips/oil/fingerprint; threads & counterbores clean√
3B-10Appearance gradingCustomer appearance mapMI100%20pc vs MK-QS-011: A none; B/C same as FQC, no new; grade conforms, released√
4B-13Marking / laser codeDrawing / traceability specMA100%20pc laser: PN MK-BR-0427, batch B2609-013, SN SN2609013-01~20; scanned match packing, clear after cleaning/rust-proof√
5E-01Product ID (PN/name)Drawing / orderMA100%Part+bale labels: PN MK-BR-0427, 20pcs (10×2), batch B2609-013, match PO-260917-04 & DN-2609-018√
6E-02Batch / serial no.Traceability specMA100%Scan 20 pcs SN2609013-01~20 unique, no dup/gap; batch B2609-013 → heat AL6061-2609-07√
7E-06NCR segregationISO 9001 8.7MA100%Shipment 20pc all conform, no NC; warehouse isolation markers intact; release FX-2609-018 signed√
8F-01Final pre-ship cleaningCleanliness requirementMA100%20pc wash→blow→lint-free wipe, white cloth clean; packed within 30min, no re-contamination√
9F-02Rust preventionCustomer specMA100%20pc VCI rust inhibitor (nitrite-free): +0.03~0.08g/pc (std 0.02~0.10, net 86.4g); uniform film, no runs√
10F-03Moisture-proof packingExport packing specMISampling6 bags sampled (3/box): foil seal continuous, 5g desiccant in, humidity card blue (dry); intact√
11F-04Cushion / partition anti-impactPacking specMI100%20pc in EVA cells, no contact; bubble wrap ≥20mm all around; no rattle/spill on shake√
12F-05Qty / accessory checkPacking listMA100%Count 20pc + weigh: net 86.4g/pc, 1.728kg total (list 1.73kg); access: 2 CoC, 1 MTC copy, 2 humidity cards√
13F-06Box label / marksOrderMA100%2 boxes: receiver, PN MK-BR-0427, 10/box, batch B2609-013, carton 1/2,2/2; marks match DN, barcode scans√
14F-07Dossier (CoC/MTC/FAI)Order requirementMA100%Per list: 2 CoC, 1 MTC AL-26090712 copy, 1 FAI FAI-2609-013 copy, 1 outgoing inspection — complete & correct√
15F-08Shipment photo archiveQuality system docMI100%8 photos (3 single, 2 EVA packing, 2 label, 1 seal) saved to QM/出货留档/2026/B2609-013√
Result☑ Conform (released) □ Non-conform Abnormal No.: None
InspectorLiu Siyuan
ReviewedZhang Mingyuan
ApprovedZhou Jianguo
OQC outgoing inspection report