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Onsite production & trading assessment
Intertek
Onsite assessment of Yixin's production and trading operation.
- Date
- Assessed June 2026 · valid to June 2027
- Reference
- 485557866_P+T
QUALITY & TESTING
Checked by others, not just by us
An independent onsite assessment, CNAS-lab test reports, in-house checks at every handover, and specifications you can write straight into a purchase order.
INDEPENDENT VERIFICATION
Issuer, scope, date and reference — on the record
Full reports are available on request. Test results apply to the sample bars submitted.
CNAS L18906
Material and property testing
Jiangsu Yinshi Inspection & Testing
Chemical composition, surface and core hardness, tensile properties, hard-chrome thickness and induction-hardened case depth.
- Date
- July 2026
- Reference
- 2026-YS-26070183118
CNAS L11694
Dimensional and surface measurement
Independent metrology laboratory
Diameter, roundness, straightness, length and surface roughness (CMM and profilometer).
- Date
- July 2026
- Reference
- TPM-TR 2607015
SPECIFICATIONS
Specify it once, and receive the same bar every time
Standard specifications below. Other sizes, tolerances and chrome layers are quoted against your drawing.
- Diameter
- Ø4–140 mm from stock, up to Ø200 mm made to order
- Tolerance
- Ø4–11: −0.02/−0.05 mm · Ø12 and up: 0/−0.02, −0.01/−0.03 or −0.02/−0.05 mm
- Straightness
- ≈ 0.1 mm/m from Ø25 · ≈ 0.2 mm/m below Ø25
- Surface roughness
- Chrome Ra ≤ 0.4 μm · ground Ra ≤ 0.8 μm
- Length
- Standard 1 m; CNC saw cut to length (≈ 3 mm allowance)
| Product | Grades | Condition | Hardness | Hard chrome |
|---|---|---|---|---|
| Chrome-plated soft shaft | 45 to GB/T 699 (comparable: C45, S45C, SAE 1045) | Ground and chrome plated, not hardened | Base ≈ HRC17 | 20–30 μm per side, up to 50 μm |
| Induction-hardened chrome shaft | 45 to GB/T 699 (comparable: C45, S45C, SAE 1045) | Induction hardened, then chrome plated | Case ≥ HRC55, ≈ 2 mm deep | 20–30 μm per side, up to 50 μm |
| Q&T ground round bar | 45 (GB/T 699); 40Cr, 42CrMo (GB/T 3077) — comparable: C45; 41Cr4, SCr440; 42CrMo4, SCM440 | Induction Q&T, roll straightened, centerless ground | 45: HRC25–28 · 40Cr: HRC28–35 · 42CrMo: HRC30–38 | — |
| Q&T chrome-plated bar | 45 (GB/T 699); 40Cr, 42CrMo (GB/T 3077) — comparable: C45; 41Cr4, SCr440; 42CrMo4, SCM440 | Q&T core, ground and chrome plated | As Q&T ground bar | 20–30 μm per side, up to 50 μm |
| Ground round bar | 45 to GB/T 699 (comparable: C45, S45C, SAE 1045) | Cold drawn or peeled, centerless ground | ≈ HRC17 | — |
IN-HOUSE INSPECTION
What we measure before a bar leaves
- Mitutoyo micrometersDiameter and tolerance
- Coating thickness gaugeHard-chrome thickness
- Rockwell hardness testerQ&T and induction-hardened hardness
- SpectrometerMaterial grade verification
Ultrasonic flaw detection, metallography and salt-spray testing are carried out by accredited third-party laboratories when an order requires them.
SIX CHECKPOINTS
A quality chain from inquiry to delivery
Requirement & drawing
Confirm the grade or reference grade, heat-treatment condition, dimensions, tolerances, surface treatment and application.
Incoming material
Check steel grade and size against the order, with spectrometer verification where required.
Process control
Turn critical dimensions, grinding, heat-treatment and plating requirements into checks at each step.
Partner handover
When chrome-plated parts return from the partner plant, re-check chrome thickness, diameter and surface.
Final inspection
Check dimensions, hardness, appearance and any specified items against the order, then mark the bars.
Packing & after-sales
Pack for the surface and the transport route. Delivery issues are reviewed against the order, photos and measurements.
TEST REPORTS
Request the third-party test reports
Existing reports cover the sample bars tested. If your order needs specific tests, list them in your RFQ; we agree the method, items and report format in the quotation and can commission third-party testing for the order.
Request a report or quote