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GRATINGS, PLANNING AND DESIGN

Our drawing office is at your service for questions on the dimensioning, drawing and design of floor gratings.

GRATINGS, PLANNING AND DESIGN

Our drawing office is at your service for questions on the dimensioning, drawing and design of floor gratings.

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Geometry

The grating’s component parts are load bearing bar, cross bar and edge bar.
During all planning involving pressure welded grating, you should as far as possible adapt the layout to the grating’s standard width (1000 mm) to obtain the most economical alternative.

If the grating is to be laid across several supports, it is best to choose grating in larger sizes. This gives a more beautiful pattern with fewer joints.

To prevent incorrect placement of the load bearing rod (the grating’s bearing structure), avoid grating with square dimensions.

Direction of travel

Depending on which type of grating you choose for your entrance, the load bearing bars should be placed correctly.

Pressure welded grating
For pressure welded grating, the load bearing bars should be placed perpendicular to the direction of travel.

Grating type A
With entrance grating type A, the load bearing bars should be placed parallel to the direction of travel.

By placing the load bearing bars correctly, the best function for the entrance grating is achieved.

Mesh widths

We have a wide range of different mesh sizes for grating. For the mesh width, these sizes are specified c/c. The first dimension is always c/c load bearing bar and the second dimension is always c/c cross bar.

Grating with the load bearing bar height marked green below, is kept in stock for quick delivery.

Name Mesh width c/c
AxB (mm)		 Load bearing bar thickness T (mm) Load bearing bar heights
C (mm)
B9 12 x 100 3 20, 25, 30, 35, 40
N4 17 x 50 2 20, 25, 30, 35, 40
N4 17 x 50 3 20, 25, 30, 35
N6 17 x 75 2 20, 25, 30
N9 17 x 100 3 20, 25, 30, 35, 40, 45, 50
D4 22 x 50 3 20, 25, 30, 35, 40, 45, 50
D4 22 x 50 4 30, 35, 40, 45, 50, 60
D4 22 x 50 5 20, 25, 30, 35, 40, 45, 50, 60
D6 22 x 75 2 25
D6 22 x 75 3 20
F4 25 x 50 3 20, 25, 30, 35, 40, 45, 50
F4 25 x 50 4 30, 35, 40, 45, 50, 60, 70, 80
F4 25 x 50 5 20, 25, 30, 35, 40, 45, 50, 60, 70, 80
H3 34 x 37 2 20, 25, 30, 35, 40
H3 34 x 37 3 20, 25, 30, 35, 40, 45, 50
H3 34 x 37 4 30, 35, 40 45, 50, 60, 70, 80
H3 34 x 37 5 20, 25, 30, 35, 40 45, 50, 60, 70, 80
H4 34 x 50 2 20, 25, 30, 35, 40
H4 34 x 50 3 20, 25, 30, 35, 40, 45, 50
H4 34 x 50 4 30, 35, 40, 45, 50, 60, 70, 80
H4 34 x 50 5 20, 25, 30, 35, 40, 45, 50, 60, 70, 80
H6 34 x 75 2 25, 30, 40
H6 34 x 75 3 20, 25, 30, 35, 40, 45, 50
H9 34 x 100 3 20, 25, 30, 35, 40, 45, 50
H9 34 x 100 4 30, 35, 40, 45, 50
H9 34 x 100 5 20, 25, 30, 35, 40, 45, 50, 60
J9 41 x 100 3 20, 25, 30, 35
J9 41 x 100 4 30, 35, 40, 45, 50, 60
J9 41 x 100 5 20, 25, 30, 35, 40, 45, 50, 60
I6 66 x 75 3 20, 25, 30
I4 68 x 50 2 20
I9 100 x 100 3 20, 25, 30

Grating with the load bearing bar height marked green below, is kept in stock for quick delivery.

Name Mesh width c/c
AxB (mm)		 Load bearing bar thickness T (mm) Load bearing bar heights
C (mm)
N9-T 17 x 100 3 25, 30, 35, 40
H4-T 33 x 50 2 25
H4-T 33 x 50 3 25, 30, 35, 40, 45, 50
H4-T 33 x 50 4 30, 35, 40, 45, 50, 60, 80
H4-T 33 x 50 5 25, 30, 35, 40, 45, 50, 60
F4-T 25 x 50 3 25, 30, 35, 40, 45, 50
F4-T 25 x 50 4 30, 35, 40, 45, 50, 60
F4-T 25 x 50 5 25, 30, 35, 40, 45, 50, 60
H9-T 33 x 100 3 25, 30, 35, 40, 45, 50
H9-T 33 x 100 4 30, 35, 40, 45, 50
H9-T 33 x 100 5 25, 30, 35, 40, 45, 50, 60
J9-T 41 x 100 3 25, 30, 35, 40, 45, 50
J9-T 41 x 100 4 30, 35, 40, 45, 50, 60
J9-T 41 x 100 5 20, 25, 30, 35, 40, 45, 50, 60
HN9-T 35 x 100 3 25, 30, 35, 40, 45, 50
HN9-T 35 x 100 4 25, 30, 35, 40, 45, 50
JN9-T 41 x 100 3 25, 30, 35, 40
JN9-T 41 x 100 5 25, 30, 35, 40, 45, 50, 60
Name Mesh width c/c
AxB (mm)		 Load bearing bar thickness T (mm) Load bearing bar heights
C (mm)
A22x22 22 x 22 2 20, 25, 30, 40, 50
A33x11 33 x 11 2 20, 25, 30, 40, 50

Construction dimensions with whole mesh widths

In the table, the construction dimensions in which the grating can be obtained (with full mesh) are set out.

Marked dimensions specify standard widths.

H also
for SS.
c/c 33
(mm)		 H also
for SS.
c/c 34
(mm)		 F

c/c 25
(mm)		 D

c/c 22
(mm)		 N

c/c 16
(mm)		 N

c/c 17
(mm)		 B

c/c 12
(mm)		 I4 20/2

c/c 68
(mm)		 J

c/c 41
(mm)		 JN9-T

c/c 41
(mm)		 HN9-T

c/c 35
(mm)
1000 1000 1000 1000 1000 1000 700 969 1000 1000 1000
966 965 973 972 982 983 685 898 957 955 961
933 931 949 950 966 966 672 830 914 915 926
900 897 923 928 >949 949 659 761 872 874 890
867 862 898 906 933 931 646 692 830 832 855
834 828 873 884 916 914 633 624 788 791 820
801 794 849 862 900 897 620 554 745 750 785
768 760 825 840 883 880 608 487 700 709 750
734 725 799 818 867 863 596 420 662 668 714
700 691 774 797 850 846 584 350 621 626 679
668 657 750 775 834 829 571 282 580 585 644
635 623 725 753 817 811 559 213 540 544 608
602 588 700 731 801 794 547 143 500 503 573
568 554 674 709 784 777 535 75 456 462 538
534 520 650 687 768 760 522 416 421 503
500 486 625 665 751 743 511 375 380 467
469 451 600 643 734 726 500 334 338 432
436 417 575 621 718 709 485 293 297 397
403 383 550 599 700 691 473 252 256 362
370 348 526 577 683 674 460 211 215 326
337 314 500 555 665 657 448 171 174 291
304 280 475 533 649 640 436 130 132 256
271 246 451 511 632 623 424 89 91 221
238 211 426 490 616 606 411 48 50 185
205 177 401 468 600 589 399 150
171 143 377 446 583 571 387 115
139 109 352 424 568 554 374 80
106 74 327 402 550 537 362 44
73 40 302 380 534 520 350
40 278 358 518 503 338
253 336 500 486 326
228 314 483 469 313
204 292 465 452 301
179 270 449 434 289
154 248 433 417 276
130 226 416 400 264
105 204 400 383 252
81 182 383 366 240
56 160 367 349 228
32 139 351 332 215
117 334 314 203
95 318 297 191
73 302 280 178
51 285 263 166
29 269 246 154
252 229 142
236 212 130
220 194 117
203 177 105
187 160 93
171 143 80
154 126 68
137 109 56
122 92 44
105 74 31
89 57 19
72 40
56 23
40

Opening area

By opening area, we mean the free dimension in the grating. A piece of information that often comes up in discussions about the transmission of light.

Name Mesh width Load bearing steel dim. Cross bar steel dim. Opening area %
B9 12 x 100 3 6.5 68.9
N4 17 x 50 2 5 77.8
N4 17 x 50 3 6.5 68.7
N6 17 x 75 2 4 82.6
N9 17 x 100 3 5 77.3
D4 22 x 50 3 6.5 73.2
D4 22 x 50 4 6.5 68.6
D4 22 x 50 5 6.5 64.0
F4 25 x 50 3 6.5 74.7
F4 25 x 50 4 6.5 70.6
F4 25 x 50 5 6.5 66.5
H3 34 x 37 2 4 83.2
H3 34 x 37 3 4 80.2
H3 33 x 37 4 6.5 70.1
H3 33 x 37 5 6.5 67.0
H4 34 x 50 2 5 83.8
H4

33 x 50

 3 5 80.7
H4 33 x 50 4 6.5 74.6
H4 33 x 50 5 6.5 71.5
H6 34 x 75 2 4 88.4
H6 34 x 75 3 5 83.7
H9 33 x 100 3 6.5 84.2
H9 33 x 100 4 6.5 81.1
H9 33 x 100 5 6.5 78.0
J9 41 x 100 3 6.5 86.0
J9 41 x 100 4 6.5 83.5
J9 41 x 100 5 6.5 81.0
I6 66 x 75 3 5 88.2
I9 100 x 100 3 6.5 90.2
Name Mesh width Load bearing steel dim. Cross bar steel dim. Opening area %
N9-T 16 x 100 3 5 77.3
H4-T 33 x 50 2 5 83.8
H4-T 33 x 50 3 5 80.7
H4-T 33 x 50 4 6.5 74.6
H4-T 33 x 50 5 6.5 71.5
F4-T 25 x 50 3 6.5 74.7
F4-T 25 x 50 4 6.5 70.6
F4-T 25 x 50 5 6.5 66.5
H9-T 33 x 100 3 6.5 84.2
H9-T 33 x 100 4 6.5 81.1
H9-T 33 x 100 5 6.5 78.0
J9-T 41 x 100 3 6.5 86.0
J9-T 41 x 100 4 6.5 83.5
J9-T 41 x 100 5 6.5 81.0
HN9-T 35 x 100 3 6.5 70.8
HN9-T 35 x 100 5 6.5 65.0
JN9-T 41 x 100 3 6.5 69.2
JN9-T 41 x 100 5 6.5 64.2
Name Mesh width Load bearing steel dim. Cross bar steel dim. Opening area %
A22x22 22 x 22 2 2 82.0
A33x11 33 x 11 2 2 76.0

Tolerances and Dimensions

Length & width dimensions

Our production is based on fixed tolerances for the length, width and diagonal dimensions. The tolerance is set to +0 / -4 mm.

Max. length of cross bar ends

Cross bar ends have a maximum protrusion of 2 mm.

Load bearing bar deflection

Maximum load bearing bar deflection is based on type.

For convex load bearing bar deflection, use span length through 150 (L/150) and a maximum of 8 mm.

For concave load bearing bar deflection, use span length through 200 (L/200) and a maximum of 8 mm.

Cross bar division

Our production is based on fixed tolerance for the cross bar division. The placing of the cross bars follows the specified mesh width with tolerances according to the diagram.

Ball proof requirements

In instances where the EU Safety of machinery 14122-2 applies to your environment, the choice of grating used must be preceded by a risk assessment.

In these instances , the following requirements apply:

  • The opening width of the grating used on work platforms or gangways must be narrow enough to prevent a 35 mm in diameter ball from passing through.
  • Grating that runs above a work site must, in contrast to temporary passageways, have openings that do not allow a ball measuring 20 mm in diameter to pass through.

20 mm
In order to satisfy the 20 mm ball proof requirement, we offer a plethora of different fine mesh grating models. The most popular grating model compliant with the 20 mm ball proof requirement is N6. However, B9, N6, N9, D4, D6, HN9-T, A22x22, and A33x11 variants are also follow in agreement.

35 mm
All our grating types, except for our large mesh gratings, are compliant with the 35 mm ball proof requirement. Out of these, the most popular and cost-effective options are the H3 and H6. In addition, 35 mm wide balls do not pass through grating with the following mesh widths – B9, N4, N6, N9, D4, D6, F4, H3, H6, H9, HN9-T, A22x22, and A33x11.

Fixing

For fixing gratings, we off a number of different fixings. Both complete clamps consisting of top section, bottom section, bolt and nut or, alternatively, top section and fixing screw. For gratings trafficked by heavy vehicles, we also offer mounting lugs welded to the bottom of the grating’s mesh.

Marking

Each grating can be provided with a substantial identification tab with clear characters that refer to the layout drawing, which makes the assembly work easier. Frequently used for slightly larger projects.

Surface treatment

Hot dip galvanisation

The diagram shows the average service life for different thicknesses of zinc in different environments.

Treatment of stainless steel

Stainless steel grating is pickled in order to restore the material after welding.

Treatment of aluminium

Aluminium grating is pickled to attain a good surface finish.

Film Z-profile kerb angle frames assembly

Load tables

In our load tables, you will find conditions for all our grating types and a number of different load cases.
Calculations are made according to Eurocode. Specified pressure surfaces and loads are specified.

Our load tables can be found below, under Documentation.

Weights grating

For information on weights for our gratings for pedestrian traffic, vehicle traffic and full-size gratings, see documentation below.

Downloads

Weights Grating

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Load table Grating

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