Flatness & Parallelism
Grinding is often used on sealing faces, wear surfaces, and mating components where flatness and parallelism are critical to assembly performance.
Services
Precision Grinding Services
Precision grinding for critical dimensions, fine surface finishes, and hardened materials. Flatness to 0.002 mm and surface finishes to Ra 0.4 µm.
Built To
Aligned9001:2015- Aligned14001:2015
- Aligned45001:2018
Capability Snapshot
The numbers that matter on your drawing
Surface finish (Ra)
0.4 µm
Flatness
0.002 mm
Roundness (TIR)
0.002 mm
Max surface envelope
630 × 1,000 mm
Max cylindrical envelope
Ø320 × 1,500 mm
Hardness capability
Up to 65 HRC
Materials we worked
- Carbon steel (A36, 1045)
- Stainless steel (304, 316)
- Ductile iron (class 35, Grade 65-45-12)
Equipment & Capacity
What we run on the floor
Our grinding department includes surface grinders, cylindrical grinders, and supporting inspection equipment for high-precision OEM components. Machines are maintained and verified on a regular schedule to support tight-tolerance work on hardened steels, tool steels, and wear-resistant materials.
Surface Grinder (M7163)
- Model
- Hangzhou M7163 (horizontal-spindle, rectangular table)
- Table size
- 630 × 1,000 mm
- Flatness achievable
- 0.002 mm
- Surface finish (Ra)
- 0.4 µm
Cylindrical Grinder (M1332B × 1500)
- Model
- Shanghai M1332B × 1500 (external cylindrical)
- Max grinding diameter
- Ø320 mm
- Max grinding length
- 1,500 mm
- Roundness achievable
- 0.002 mm
Drawing-Driven Precision Grinding
Where Grinding Adds Value
Precision grinding is typically specified when turning or milling alone cannot reliably achieve the required flatness, dimensional accuracy, or surface finish. We review each drawing to determine where grinding adds measurable value to the finished component.
Tight Dimensional Tolerances
For features requiring tighter dimensional control than conventional machining can consistently achieve, grinding provides an additional level of accuracy and repeatability.
Fine Surface Finishes
Grinding improves surface quality on hardened steels, tool steels, and precision wear components where roughness directly affects performance or service life.
Quality & Inspection
Documentation you can hand to your QA
Inspection records, material certificates, and measurement data are maintained throughout production and can be provided according to customer requirements.
Flatness Verification
Flatness is measured on calibrated granite surface plates using appropriate indicators and documented according to inspection requirements.
Roundness Inspection
Cylindrical components can be inspected for roundness, runout, and related form characteristics. Additional reports are available when specified.
Surface Roughness Measurement
Ra, Rz, and other specified roughness parameters are measured at the locations defined on the drawing.
Hardness Verification
Heat-treated components are checked against specified hardness requirements before final grinding and inspection.
Our Process
From RFQ to delivery
Step 01Pre-Grind Review
Drawing requirements, material condition, hardness, and grinding allowance are reviewed before production begins.
Step 02Setup & Wheel Preparation
The grinding wheel, workholding method, and machine setup are selected according to the material and surface finish requirements.
Step 03Rough Grinding
Material is removed to establish the required geometry while maintaining process control throughout the operation.
Step 04Finish Grinding
Final grinding passes are completed to achieve the specified dimensions, flatness, roundness, and surface finish.
Step 05Inspection & Shipment
Critical characteristics are verified against drawing requirements before packaging and shipment.
Related Reading
From our engineering notes
Long-form pieces our team has written from real shop-floor work, with the trade-offs and decisions behind them.
Finishing Add-On
Need finishing on these parts?
Anodize, passivation, plating, powder coating, bead blast, polish, and water-based spray paint coordinated through SCPM as a packaged add-on to your precision grinding order — one drawing, one PO, no separate finishing supplier to manage.
Common Questions
Frequently asked about precision grinding
What surface roughness can precision grinding achieve?
Typically Ra 0.4 µm or better. For mirror finishes we can achieve Ra 0.1 µm with superfinishing wheels.
What flatness tolerances are achievable?
0.002 mm flatness over a 600 × 300 mm surface. Tighter requirements are evaluated per part geometry.
Do you grind hardened steel?
Yes. Grinding is typically applied after heat treatment to restore dimensions lost during the hardening process.
Can grinding be combined with other operations in one order?
Yes. Most grinding work is performed as a finishing step after turning or milling within the same production order.
Ready to discuss your part?
Send us your drawings and we'll review them — no commitment required.
Request a Quote