1. About C250 Square Clear Opening 208/300/404/504 DI Manhole Cover
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Material: Ductile Iron Shape:Square Ranges: C250 Clear Opering: φ208/300/404/504 Seal: Single Seal Lock: Without Key hole: Closed Cut-corner Design: available |  |
Item Code | Frame Dimensions (mm) | Cover Dimensions (mm) | Pieces on Each Pallet |
O × O’ | A × A’ | H | C × C’ | e |
2020C1 | 208X208 | 300X300 | 40 | 236X236 | 34 | 126 |
3030C1 | 300X300 | 400X400 | 40 | 336X336 | 34 | 80 |
4040C1 | 404X404 | 500X500 | 46 | 435X435 | 39 | 44 |
5050C1 | 504X504 | 600X600 | 51 | 535X535 | 44 | 20 |
6060C1 | 604X604 | 700X700 | 56 | 635X635 | 49 | 18 |
7070C1 | 704X704 | 800X800 | 65 | 734X734 | 58 | 15 |
8080C1 | 804X804 | 900X900 | 70 | 834X834 | 62 | 14 |
4545C1 | 450X450 | 550X500 | 75 | 485X485 | 70 | 26 |
6060C3 | 600X600 | 700X700 | 45 | 635X635 | 40 | 22 |
2. Design:
Professional software used for design and test

- A group of highly experienced technical engineers are right here waiting for any of your request.
- We are able to use most of the world-wide engineering software, including AUTO Cad, Pro Engineer, Solid Works and etc.
3. Production Facility
Besides traditional hand moulding, we also use Automatic Moulding Lines for better surface condition and dimension accuracy.

4. Quality Control


Permanent Set and Load Test
An independent Quality Control is supervised directly by General Manager and responsible for following duties:
- Physical and chemical analysis, dimension measurement, weighting and other inspection of the raw material and finished products.
- Particular test for different products.
- Visual measurement and conformation to standards.
- Identifying, recording and disposing of rejected material.
5. Certificates - We Are Certified!

6. Contact SYI Group
SYI Industrial Co., Ltd.
- Email: zhangjian#syifoundry.com (# = @)
- Tel: 0086 351 2027764
- Fax: 0086 351 4040962
- Website: www.syifoundry.com
You will get our quick reply!
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Best regards
SYI Group