ACEROGRILL

LA INDUSTRIA DEL GRATING

QUALITY PRODUCTION
QUALITY SELECTION

Acero Grill
manufactures its
electroforged bar
grating in accordance
with international
standards (ASTM &
NAAMM) guaranteeing
product durability,
resistance and quality

Bearing bars and twisted cross

bars are selected using a rigorous
quality control process.

ELECTROFORGING PROCESS
HYDRAULIC PRESSURE
+
ELECTRIC ARC

Electroforging cross
bars and bearing bars
form a rigid panel
without the addition of
any material.

FINISHING

Most customer needs are complied

with using standard hot dip
galvanized, painted or black
electroforged steel bar grating.

GENERAL DESIGN FEATURES I

SAFE LOAD TABLE
BEARING
BAR
SIZE
In (mm)
19,1 x 3,2
(3/4 x 1/8)

19,1 x 4,8
(3/4 x 3/16)

25,4 x 3,2
(1 x 1/8)

25,4 x 4,8
(1 x 3/16)

31,8 x 3,2
(1 1/4 x 1/8)

31,8 x 4,8
(1 1/4 x 3/16)

38,1x3,2
(1 1/2 x 1/8)

38,1x4,8
(1 1/2 x 3/16)

50,8x4,8
(2 x 3/16)

57,2x4,8
(2 1/4 x 3/16)

63,5x4,8
(2 1/2 x 3/16)

SPAN

U
F
C
F
U
F
C
F
U
F
C
F
U
F
C
F
U
F
C
F
U
F
C
F
U
F
C
F
U
F
C
F
U
F
C
F
U
F
C
F
U
F
C
F

0,50

0,75

1,00

1,25

1,50

2612
1,6
653
1,3
3918
1,6
979
1,3
4643
1,2
1161
1,0
6965
1,2
1741
1,0
7255
1,0
1814
0,8
10882
1,0
2721
0,8
10447
0,8
2612
0,7
15670
0,8
3918
0,7
27858
0,6
6965
0,5
35258
0,5
8814
0,4
43528
0,5
10882
0,4

1161
3,7
435
2,9
1741
3,7
653
2,9
2064
2,7
774
2,2
3095
2,7
1161
2,2
3224
2,2
1209
1,8
4836
2,2
1814
1,8
4643
1,8
1741
1,5
6965
1,8
2612
1,5
12381
1,4
4643
1,1
15670
1,2
5876
1,0
19346
1,1
7255
0,9

653
6,5
326
5,2
979
6,5
490
5,2
1161
4,9
580
3,9
1741
4,9
871
3,9
1814
3,9
907
3,1
2721
3,9
1360
3,1
2612
3,3
1306
2,6
3918
3,3
1959
2,6
6965
2,4
3482
2,0
28814
2,2
4407
1,7
10882
2,0
5441
1,6

418
10,2
261
8,1
627
10,2
392
8,1
743
7,6
464
6,1
1114
7,6
696
6,1
1161
6,1
725
4,9
1741
6,1
1088
4,9
1671
5,1
1045
4,1
2507
5,1
1567
4,1
4457
3,8
2786
3,1
5641
3,4
3526
2,7
6965
3,1
4353
2,4

290 C = safe concentrated load, lb/ft of grating

14,6
width, at mid span
218 F = deflection in inches
11,7
435 Theoretical values based on:
fx = 18,000 psi
14,6 E = 30,000,000 psi, gross section of bearing bar
326
11,7 1.75
516
379
11,0
15,0
387
332
8,8
12,0
774
569
11,0
15,0
580
497
8,8
12,0 2.00
806
592
453
8,8
12,0
15,6
605
518
453
7,0
9,6
12,5 2.25
1209
888
680
537
8,8
12,0
15,6
19,8
907
777
680
605
7,0
9,6
12,5
15,8
1161
853
653
516
7,3
10,0
13,0
16,5
871
746
653
580
5,9
8,0
10,4
13,2 2.50
1741
1279
979
774
627
7,3
10,0
13,0
16,5
20,3
1306
1119
979
871
784
3.00
5,9
8,0
10,4
13,2
16,3 2.75
3095
2274
1741
1376
1114
921
774
5,5
7,5
9,8
12,4
15,3
18,5
22,0
2322
1990
1741
1548
1393
1266
1161
4,4
6,0
7,8
9,9
12,2
14,8
17,6
3918
2878
2204
1741
1410
1166
979
4,9
6,6
8,7
11,0
13,6
16,4
19,5
2938
2518
2204
1959
1763
1603
1469
3,9
5,3
6,9
8,8
10,8
13,1
15,6
4836
3553
2721
2150
1741
1439
1209
4,4
6,0
7,8
9,9
12,2
14,8
17,6
3627
3109
2721
2418
2176
1979
1814
3,5
4,8
3,2
7,9
9,8
11,8
14,1

U = safe uniform load (lb/sq.ft)

Numeric values in shadowed area define gratings conforming with NAAMM.

Numeric values in shadowed area produce a deflection of or less under a uniform load of 100 pounds per sq. ft. This deflection
is recommended as the maximum to provide pedestrian comfort. It can be exceeded at the discretion of the engineer.
The carrying capacity of a piece of grating subjected to a concentrated load over only a portion of its width, is determined by
stiffness of both bearing and cross bars and therefore differs with the type of grating used. To determine the final load capacity,
Acero Grill's engineering department should be consulted.
As a general rule selecting grating sizes when a serrated surface is desired, is to select the size needed from the Safe Load
Table upgrading it to the next higher bearing bar size.

HOW TO SELECT
ELECTRO-FORGED BAR GRATING

HOW TO SELECT THE BEARING BAR SIZE

P

50
100
150
200
250
300
350
400
450
500

2- 6

3- 0

4- 0

5- 0

1 x 1/8
1 x 1/8
1 x 1/8
1 x 1/8
1 x 1/8
1 x 1/8
1 x 1/8
1 x 1/8
1 x 1/8
1 x 1/8

1 x 1/8
1 x 1/8
1 x 1/8
1 x 1/8
1 x 1/8
1 x 1/8
1 x 1/8
1 x 3/16
1 x 3/16
1 x 3/16

1 x 1/8
1 x 1/8
1 x 1/8
1 x 1/8
1 x 1/8
1 x 1/8
1 x 3/16
1 x 3/16
1 x 3/16
1 1/4 x 3/16

1 x 1/8
1 x 1/8
1 x 1/8
1 x 3/16
1 x 3/16
1 1/4 x 3/16
1 1/4 x 3/16
1 1/4 x 3/16
1 1/4 x 3/16
1 1/4 x 3/16

SPAN
5- 6
1 x 1/8
1 x 1/8
1 x 3/16
1 1/4 x 3/16
1 1/4 x 3/16
1 1/4 x 3/16
1 1/4 x 3/16
1 1/4 x 3/16
1 1/4 x 3/16
1 1/4 x 3/16

6-0
1 x 1/8
1 x 3/16
1 1/4 x 3/16
1 1/4 x 3/16
1 1/2 x 3/16
1 1/2 x 3/16
1 1/4 x 3/16
2 x 3/16
2 x 3/16
2 x 3/16

6- 6
1 x 3/16
1 1/4 x 3/16
1 1/2 x 3/16
1 1/2 x 3/16
2 x 3/16
2 x 3/16
2 x 3/16
2 x 3/16
2 x 3/16
2 x 3/16

7- 0
1 x 3/16
1 1/4 x 3/16
1 1/2 x 3/16
1 1/2 x 3/16
2 x 3/16
2 x 3/16
2 x 3/16
2 x 3/16
2 x 3/16
2 x 3/16

8- 0

9- 0

1 1/4 x 3/16
1 1/2 x 3/16
1 1/2 x 3/16
2 x 3/16
2 x 3/16
2 x 3/16
2 x 3/16
2 1/4 x 3/16
2 1/4 x 3/16
2 1/4 x 3/16

1 1/2 x 3/16
1 1/2 x 3/16
2 x 3/16
2 x 3/16
2 x 3/16
2 1/4 x 3/16
2 1/4 x 3/16
2 1/2 x 3/16
2 1/2 x 3/16
2 1/2 x 3/16

P = CONCENTRATED LOAD IN LBS. PER SQ. FT. GRATING WIDTH

ALL DIMENSIONS GIVEN ARE IN INCHES

This table allows the customer to select the size of the hearing bars and span (type G1 grating) according to the load it is
going to support complyingg with NAAMM recommendation of 1/4 maximun deflection for pedestrian comfort.

HOW TO SPECIFY ACERO GRILLS

BAR GRATING
In order to expedite your order, please specify the
following data:
- Grating type
- Number of panels
- Length and width of panel
- Surface type (plain or serrated)
- Bearing bar size
- Type of fasteners required
- Finishing (hot dip galvanized, black steel or painted.
Please include paint spec's from preferably Dupont,
PPG, Mobil Chemical or Sherwin Williams)
- Maximum load to support
- Span
- Maximum deflection required
- Complete shipping instructions

GENERAL DESIGN FEATURES II

GRATING TYPES
4(101,6mm)
1 3/16
(30,2mm)

G1 TYPE

4(101,6mm)

For gratins with other than 1

3/16 bearing bar spacing,
different lengths or different
desing stress, consult Acero
Grill's sales department.

1 3/16
(30,2mm)

G2 TYPE

STANDARD GRATING SIZES

Width

Large of panel

0,61 mts. (2')

3,05 mts. (10')

0,61 mts. (2')

6,10 mts. (20')

0,91 mts. (3')

3,05 mts. (10')

0,91 mts. (3')

6,10 mts. (20')

PANEL WEIGHTS
BAR GRATING CLASSIFICATION

WEIGHT - lbs./sq.ft.
GRATING TYPE

BEARING BAR DIMENSIONS BEARING BAR DIMENSIONS

(Inches)
(mm)

G1

G2

3/4 x 1/8

19,1 x 3,2

4.07

4.66

3/4 x 3/16

19,1 x 3,2

5.90

6.49

1x 1/8

25,4 x 3,2

5.17

5.76

25,4 x 4,8

7.57

8.16

1 x 3/16

31,8 x 3,2

6.28

6.88

1 x 3/16

31,8 x 4,8

9.22

9.81

1 x 1/8

38,1 x 3,2

7.39

7.98

1 x 3/16

38,1 x 4,8

10.86

11.58

2 x 3/16

50,8 x 4,8

14.17

14.89

2 x 3/16

57,2 x 4,8

15.83

16.55

2 x 3/16

63,5 x 4,8

17.48

18.20

We maintain inventory of bar gratings

shown in black spaces.

ACERO GRILLS STANDARD

STAIR TREADS
STANDARD TREAD SIZES*

TREAD WIDTH "B"

(mm)/(in.)

DIMENSION "A"
(mm)/(in.)

64 / 2 /2

114 / 4 1/2

114 / 4 /2

178 / 7

- Grating Type.
- Number of treads.
- Length and width of treads.
- Bearing bar size.
- Surface type (plain or serrated).
- Finishing ( hot dip galvanized,
black steel or painted. Please
include paint spec's from
preferably Dupont, PPG, Mobil
Chemical or Sherwin Williams).
- Complete shipping instructions.

157 / 6 /16
187 / 7 /8

218 / 8 /16
248 / 9 /4
278 / 10

How to specify Acero Grill's stair

treads:
In order to expedite your order,
we need the following data:

15

/16

178 / 7

1
308 / 12 /8

178 / 7

*Sizes based on 1 x 3/16 bearing bars.

1 3/4

SCHEMATIC TREAD DRAWING

1 1/4

7/16

1 1/8

A
B
Lengths in inches

The Acero Grill's stair treads are manufactured using the G1 grating type. Special tread sizes could be
manufactured at customer request.

MAXIMUM TREAD
LENGTH ALLOWANCE
Bearing Bar
Size (in.)
3/4" x 3/16"
1" x 3/16"
1" x 3/16"
1" x 3/16"

Max. Tread Length*

Plain
(in.)

Serrated
(in.)

2'-2"
3'-0"
4'-0"
5'-3"

2'-6"
3'-5"
4'-7"

* Maximum tread based on 400-lb. concentrated load on

nosing and 4 bearing bars at center of tread length. For
maximum length under other loads, our Engineering
Department should be consulted.

GENERAL RECOMENDATIONS FOR

GRATING INSTALLATION
STANDARD FASTENING METHODS
WELDED INSTALLATION

OMEGA FASTENER

Welds at ends of 3rd. bearing bar

from each side of panel

One weld in middle of panel

at each intermediate support.

RECOMMENDED FOR ALL PERMANENTLY INSTALLED

GRATINGS AND FOR THOSE WHICH ARE TO BE REMOVED AT
INFREQUENT INTERVALS. PLEASE REFER TO THE AWS
MANUAL FOR DETAILS ON WELDING GALVANIZED PARTS..

STANDARD INSTALLATION CLEARANCES

SPAN
(Direction of bearing bar)
Panel length

Panel width

Panel length

Panel width

1/4

3/8

CLEARANCES SHOWN ARE RECOMMENDED BUT MAY VARY IN

ACCORDANCE WITH DIMENSIONAL TOLERANCES AS SHOWN
ON THE SUPPORT AND CLEARANCES TECHNICAL SHEET.

THESE CLIPS MAY BE USED FOR INSTALLATIONS WHERE

GRATING IS SUBJECT TO FREQUENT REMOVAL.
STEEL CLIPS TO BE USED ON GALVANIZED STEEL
GRATINGS SHOULD BE GALVANIZED.

OMEGA FASTENER WITH

SHIFT LOCK

SUPPORT AND CLEARANCES

INSTALLATION CLEARANCES
1/4
1/4

1/4

Bearing
bars

1/4

Bearing
bars

Bearing
bars

1/4
1/4

1/4

The values shown meets

the NAAMM (National
Association of Architectural
Metals Manufactures)
tolerances and
specifications for grating
manufacturing and
fabrication.

Bearing
bars

Bearing
bars

min. clearance
equal to support
angle thickness

Bearing
bars

Bearing
bars

MANUFACTURING TOLERANCES
OVERALL DIMENSIONS
AND SQUARENESS

CROSS BAR ALIGNMENT

AND SPACING

Width (W) overall 1/4

1/8

Cross bar shall not vary more

than 1/8 in 12 in either
direction from perpendicular
alignment with bearing bars

LLength (L) 1/4

=D

1/4

1/8

D and D' are overall

diagonal dimensions.

1/4 C - C end cross bars in 5- 0 length

W and A' are overall

lengths of cross bars at
opposite ends of panel.

TRANSVERSE BOW
(Before fastening to supports)
W= W 1/4

BEARING BAR LEAN

1/8 per tool of whidth

Bearing bars

1/8 per tool of whidth

Cross bars

6O

CROSS BAR LOCATION

LONGITUDINAL BOW

1/16 maximum

1/200 of length

Cross bars
Bearning bars

Bearing
bars

1/4

Bearing
bars

PROJECT ENGINEERING
GRATING FABRICATION
a

Specified
cutout
4 x 6

R1

Actual cutout
5 3/4 x 6

b
R2

O
GRATING TYPE G1

IN ORDER TO FABRICATE CIRCULAR OR TRAPEZOIDAL

SECTIONS, THE CUSTOMER SHALL INDICATE R1, R2 AND
O, OR a,b, AND h.
CUTOUTS FOR CIRCULAR OBSTRUCTIONS ARE
RECOMMENDED TO BE AT LEAST 2 LARGER IN
DIAMETER THAN THE OBSTRUCTION. IT IS FURTHER
RECOMMENDED THAT CUTOUTS FOR ALL PIPING 4 OR
LESS IN DIAMETER BE MADE IN THE FIELD.

AS SHOWN IN THE DRAWING ABOVE, ALL

RECTANGULAR CUTOUTS ARE MADE TO THE NEXT
BEARING BAR PAST THE OBSTRUCTION.

PROJECTS
A

IPE 200

IPE 200

IPE 200

IPE 200

11

9
10

IPE 200
G

15

12

IPE 200

15

16

15

15

19

IPE 200
17

IPE 200

15

14

13

15

15

18

IPE 200

FIGURE 1
SUPPORT STRUCTURE
(Customer Drawing)

FIGURE 2
GRATING DISTRIBUTION DRAWING

WITH THE APPROVED DRAWINGS OR THE ENGINEER'S DESIGN DRAWINGS AND LOAD REQUIREMENTS, OUR TECHNICAL
DEPARMENT EVALUATES THE APPLICATION, SUPPORT AND LOAD REQUIREMENTS IN ORDER TO RECOMMEND THE TYPE
AND SIZE OF GRATING MOST APPROPRIATE FOR THE PROJECT FAVORING THE CUSTOMER WITH THE GREATETS ECONOMY
AND EASE OF INSTALLATION, ACCORDING TO THE HIGHEST INTERNATIONAL STANDARDS.