Custom Tungsten Carbide Machining Tolerance & Drawing Requirements
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- Issue Time
- Nov 2,2026
Summary
This guide explains standard machining tolerance ranges for custom tungsten carbide parts and what information must be marked on drawings, to help buyers avoid quotation misunderstanding, sample rework and delivery deviation for carbide custom orders.
Full Article Structure
1. Why Clear Drawings Shorten Custom Lead Time
Tungsten carbide is hard and brittle. Vague dimensions or missing tolerance notes will cause repeated confirmation, sample rework and longer delivery. Complete drawings help our engineers evaluate processing difficulty, select grinding or EDM process and give accurate quotation directly.
2. Reference Tolerance for Carbide Machining Features
| Machining Feature | General Standard Tolerance | High Precision Tolerance |
|---|---|---|
| Outer diameter / Length | ±0.03 mm | ±0.005 mm |
| Hole inner diameter | ±0.04 mm | ±0.008 mm |
| Flatness / Parallelism | 0.03 mm | 0.005 mm |
| Edge chamfer & radius | ±0.05 mm | ±0.01 mm |
Note: The table is for reference only. The achievable tolerance depends on part shape, thickness and processing method. Tighter tolerance will raise cost and lead time.
3. Required Information on Your Drawing
- Nominal dimension + tolerance for all critical features
- Specified carbide grade, surface roughness Ra value
- Edge requirement: sharp edge / chamfer / radius
- Geometric tolerance: flatness, perpendicularity, concentricity if needed
- Inspection requirement, sampling standard or FA report demand
4. Common Ambiguity Points to Confirm Before Quotation
- Whether the tolerance applies to sinter blank or finished machined part
- Whether burr removal is required on all edges
- Acceptable inspection tool: micrometer, optical comparator or CMM
- Surface protection requirement for finished carbide parts
5. FAQ: Drawing Revision & Tolerance Adjustment
Q1: Can we adjust tolerance after sample trial?
Yes, we can re-evaluate the process and update quotation once you confirm revised drawing.
Q2: What if I only have a sample instead of CAD drawing?
We can reverse measure and make drawing for confirmation before formal production.
6. Summary
Complete drawings with clear tolerance marks are the foundation of stable carbide custom orders. Avoid over-specifying ultra-tight tolerance on non-critical surfaces to control cost. Send PDF drawing + 3D file together for our fastest technical review.
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Disclaimer
The tolerance data in this article is for reference only. The actual achievable tolerance depends on part geometry, material grade and processing method. Final technical standard shall be confirmed on drawing and quotation.