What is the difference between B125, C250 and D400?

They are EN 124 load classes: B125 is a 12.5 tonne test load for footways and car parks, C250 is 25 tonnes for kerbside and channel areas, D400 is 40 tonnes for carriageways. All three are published here: the GCC range in the 600×600 format, and the international range from 300×300 to 900×900.

Do the different classes share a frame?

C250 and D400 share a common frame, 100 mm deep. B125 has its own frame at 38 mm.

Which is right for a car park?

B125 covers light vehicle areas. Where delivery vehicles or heavy traffic cross the cover, specify C250 or D400.

Can you supply sizes other than those listed?

Yes. The published sizes are the standard range; other clear openings are produced to order.

Manhole Covers

Solid Top Manhole Covers

Single-piece covers in square and circular formats, from footway duty through to carriageway D400.

Solid Top

Ductile iron, EN 124 B125 / C250 / D400

The plain workhorse: one casting, one frame, no infill and no moving parts. Two ranges are published here — the GCC 600×600 in B125, C250 and D400, and the international range of seventeen models to EN 124-2, from 300×300 to 900×900 across the same three classes. The frame deepens with the load class it has to carry: on the 600×600, B125 seats in a 38 mm frame while C250 and D400 share a 100 mm frame, and every frame depth is published per model in the tables.

Material: Ductile iron GGG50 (EN-GJS-500-7), both ranges
Standard: EN 124-2
Coating: Bitumen as standard; epoxy on request
Frame: Depth follows the load class — 38 mm (B125) and 100 mm (C250/D400) on the 600×600; per-model depths in the international table
Seating clearance: 2 mm on the 600×600 models
Options: GRP sealing plate provision

Isometric view of the 600x600 solid top manhole cover seated in its frame — Dimensions are listed below; full drawings and DWG files are available on request.

Specifications

12 sizes, 3 load classes

Dimensions in millimetres. Sizes outside this range are produced to order.

GCC range

Solid Top Manhole Covers — GCC range, dimensions, load classes and weights
Reference	Clear opening(mm)	Frame outer(mm)	Frame depth(mm)	Load class(EN 124)	Weight(kg)
600×600 Solid Top	600 × 600	733 × 731	38	B125	35
600×600 Solid Top	600 × 600	733 × 731	100	C250	55
600×600 Solid Top	600 × 600	733 × 731	100	D400	63

International range

Solid Top Manhole Covers — international range, dimensions, load classes and weights
Reference	Clear opening(mm)	Frame outer(mm)	Frame depth(mm)	Load class(EN 124)	Weight(kg)
FDG-B300	201 × 201	295 × 295	25	B125	5.2
FDG-B400	301 × 301	395 × 395	25	B125	8.5
FDG-B500	400 × 400	495 × 495	30	B125	13.5
FDG-B600	500 × 500	595 × 595	35	B125	20.5
FDG-B700	600 × 600	695 × 695	40	B125	30.3
FDG-C300	201 × 201	295 × 295	35	C250	5.7
FDG-C400	301 × 301	395 × 395	40	C250	10.9
FDG-C500	400 × 400	495 × 495	50	C250	17.3
FDG-C600	500 × 500	595 × 595	65	C250	26.7
FDG-C700	600 × 600	695 × 695	70	C250	37
FDG-C800	700 × 700	795 × 795	71	C250	52
FDG-D400	266 × 266	400 × 400	75	D400	15.6
FDG-D500	366 × 366	500 × 500	75	D400	23.8
FDG-D600	466 × 466	600 × 600	80	D400	35.8
FDG-D700	566 × 566	700 × 700	85	D400	50.5
FDG-D800	666 × 666	800 × 800	85	D400	61.5
FDG-D900	766 × 766	900 × 900	100	D400	93

Seventeen models to EN 124-2, single-piece covers with matching frames, EN-GJS-500-7 ductile iron, bitumen coated. Models are named for their nominal size — FDG-B300 is the 300 size — and the frame outer given here is the measured dimension, which on the B125 and C250 covers runs 5 mm under the nominal. Frame depth is the overall installed depth read from the section. Full drawings and DWG files are available on request.

Common questions

Specifying manhole covers

What is the difference between B125, C250 and D400?: They are EN 124 load classes: B125 is a 12.5 tonne test load for footways and car parks, C250 is 25 tonnes for kerbside and channel areas, D400 is 40 tonnes for carriageways. All three are published here: the GCC range in the 600×600 format, and the international range from 300×300 to 900×900.
Do the different classes share a frame?: C250 and D400 share a common frame, 100 mm deep. B125 has its own frame at 38 mm.
Which is right for a car park?: B125 covers light vehicle areas. Where delivery vehicles or heavy traffic cross the cover, specify C250 or D400.
Can you supply sizes other than those listed?: Yes. The published sizes are the standard range; other clear openings are produced to order.

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