The gratings
in this series are rated heavy duty when supported on all four sides.
Other special sizes quoted on request in the event none of the standards
shown in this series meet your requirements. In ordering replacement grates
to be used on existing catch basins, be sure to specify the exact size of
opening in which the grate will be used.
Many of the grates in this series can be adapted to
trench frames with support on two sides as shown on pages 282 and 283. Most
are qualified as heavy duty when the short dimension spans the trench.
Advise loading requirements so we can assist you with your choice.
The above schematic drawing identifies basic dimensions
only and does not apply to all grate designs. Bar and rib depths, plate
thicknesses, and seating widths, may vary on different sizes and styles. If
your project has design restrictions, ask for approval drawings.
Search for part number HERE after you have
found it.
Dimensions in inches
Catalog No.
A
B
G
H
Grate Type
Square Heavy Duty
R-4400
8x8
1 1/4
1x5
1
B
R-4401
8x8
1
3/8x3
3/8
A
R-4408
10 1/4x10 1/4
1
7/8x8 1/4
1
B
R-4441-1
12x12
1
3/8x4 1/2
1
Q
R-4511
14x14
1 1/2
1 1/2x5 1/8
1 1/8
A
R-4550
15x15
1 1/4
3 1/2x3 1/2
3/4
C
R-4552
16x16
1 3/4
1 1/4x6 1/4
1 1/4
A
R-4557
16x16
1 1/4
1 3/16x3 3/8
3/4
A
R-4558
17 5/8x17 5/8
1 1/4
1x5
1/2
C
R-4660
18x18
1 1/2
3x4 1/2
1 1/4
C
R-4662
19 3/4x19 3/4
2 1/2
1 3/8x8 1/2
1
A
R-4720
20x20
1 3/4
1 3/8x3 1/2
1 1/4
C
R-4721-A
21x21
1 3/4
1 1/2x8
1 1/4
A
R-4725
21x21
2
3x3
1
C
R-4760
22x22
1 3/4
3x5 3/4
1
C
R-4765
23x23
2
1x6 1/4
1
A
R-4808-A
24x24
2
1/2x4 1/2
1 5/8
Q
R-4810
24x24
2
1 3/4x6
1 1/4
C
R-4820
24x24
2
1 3/4x5 7/8
1 3/8
C "
R-4826
24x24
2
1x6
1 1/4
A
R-4832
24x24
1 5/8
1 1/16x4 3/4
1
C
R-4832-B
26x26
1 3/4
1 1/16x4
1
C
R-4833
26x26
2
2x7
1
A
R-4850
27x27
2
2 1/2x7 1/2
1
C
R-4852
27x27
2
1 1/2x5
1
C
R-4852-A
27x27
1
1 1/2x5
1
C
R-4859-C
27 1/2x27 1/2
1
2x7
1
A Δ
R-4859-S
27 1/2x27 1/2
1
1 1/2x4 3/4
1
S ** Δ
R-4871
27 1/2x27 1/2
1
2x24
1
B § Δ
R-4880
28x28
2
1 1/2x7 1/4
1
C
R-4880-C
30x30
1 1/2
1 1/4x5 7/8
1 1/4
C
R-4882
34x34
2
2x14 1/2
1 1/8
A §
R-4882-A
34x34
2
1x9
1 1/8
A
R-4884-A
36x36
1 3/4
2x4
1 3/8
C *
Catalog No.
A
B
G
H
Grate Type
Rectangular Heavy Duty
R-4389-O
6x12
1 1/4
3/4x4
1
B
R-4390
6x24
1
3/4x4 1/2
1
B
R-4403
8x14
1
1 1/2x2 1/8
1/2
A
R-4404-C
8x24
1
1 1/16x5 7/8
1
B
R-4406
8x24
1 3/4
1 5/16x6
1
B
R-4406-1
8x24
1 3/4
1x2 5/8
3/4
A
R-4406-2
8x24
1 3/4
1x5
1
C
R-4406-C
9 1/4x23 7/8
1
1x2 7/8
1
A
R-4407-2A
9 1/2x24
1 3/4
1x7 1/2
1
B
R-4409
10x17 3/4
1 1/2
1x3 1/2
1
A
R-4409-A
10x24
1 3/4
1 1/4x4 3/4
1
C
R-4409-C
10x24
1 3/4
1x7
1
B
R-4409-E
10x24
1 3/4
1x3 1/2
1
A
R-4409-G
10x24
1 1/2
2x8
1
B
R-4421
10x40
1 1/8
1 1/4x8 1/2
1
C
R-4423-A
10 1/4x48
1 5/8
1 1/2x3 1/8
1
A
R-4424
10 1/2x23 1/8
1 3/4
2x2
1
A
R-4430-A
11x24
1 1/2
3/4x4 1/8
3/4
A
R-4430-B
11 1/2x24
1 1/2
1x6 5/8
1
C
R-4435-1
11 7/8x14
2
1x5 1/2
1
C
R-4443
12x14
1 3/4
1 1/2x5 1/4
1 1/4
A
R-4449
12x24
1 1/2
1 1/2x4 1/4
1
A
R-4450
12x24
1 3/4
1x4 1/2
1
A
R-4450-A
12x24
1 3/4
2x2
1
A
R-4451
12x24
2
1 1/2x3 3/4
1
C
R-4454
12x26
1 1/2
1/2x11 1/2
1/2
C
R-4460
12x30
2
1 1/4x4
1
A
Catalog No.
A
B
G
H
Grate Type
Rectangular Heavy Duty
R-4462
12x35 3/4
1 1/2
3/4x9
1
B
R-4470
12x48
1 3/4
1x4 1/2
1
A
R-4525
14x24
2
1x5 1/2
1
A
R-4530
14 1/2x22
2
1 1/2x5 1/2
1 1/4
A
R-4531
14 1/2x23 7/8
1
1x5
1
A
R-4540
14 1/2x26 1/2
2
2 1/4x4
1
C
R-4541
14 1/2x28
1 3/4
1 1/4x5
1 1/4
A
R-4544
14 1/2x37 3/4
1 3/4
2x5 3/8
1 1/4
A
R-4545
14 1/2x48
1 3/4
1 1/4x5
1 1/4
A
R-4548
15x20 1/2
1 1/2
2x2
3/4
A
R-4570-1
15x23
1 3/4
1 1/2x5 1/2
1 1/8
A
R-4570-2
15x23 7/8
1 1/2
1x6
1
A
R-4573
15x30
2 1/2
1 1/8x5 1/2
1
A
R-4575-A
15x36
1 3/4
1 13/16x6 1/2
3/4
A
R-4579
15 1/8x23
1 1/2
1 3/8x5 1/2
1 3/8
A
R-4583
15 1/2x22 1/4
1 3/4
1 5/8x5 1/2
1 3/8
A
R-4584
15 1/2x36
1 3/4
1 1/2x5 1/4
1 3/8
A
R-4585
15 1/2x39
1 3/4
1 7/8x5 7/8
1 1/4
A
R-4586
15 3/4x36
1 3/4
1 1/2x5 1/4
1 3/8
A
R-4600
16x23
2
1 1/4x3 3/4
1
A
R-4603-A
16x24
1 1/8
3/4x5 1/2
1
A
R-4604
16x24
1 1/2
2x4
7/8
C
R-4604-C
16x24
2
2x5
2
A
R-4604-D
16x24
2 1/2
2 1/2x6 5/8
3/4
A
R-4608
16 1/2x19 3/4
1 1/2
1 1/4x6
1
A
R-4610
16 1/2x22
1 3/4
1 1/2x4
1
A
R-4620
17x19
2
1 1/4x4 1/4
1 1/8
A
R-4630
17x20
1 1/2
1 1/4x6 1/2
1
C
R-4632
17x21
2
1 3/8x8 3/4
1
C
R-4640
17x21 1/2
1 3/4
2 1/2x4 1/4
1
A
R-4641-A
17x24
2
1x7
7/8
A
R-4641-C
17x24
2
1x6 1/2
1
C
R-4641-F
17x34
1 1/2
1 1/2x6 3/4
1
A
R-4649
17 1/4x24
1 3/4
1x6 1/2
1
A
R-4652
17 3/4x29 3/4
2
1 1/2x4 1/2
1 1/8
A
R-4670-A
18x24
1 1/2
1 1/8x6 3/4
1 1/8
A
R-4671
18x24
2
1x7 1/2
1
1/16
A
R-4672
18x24
2
1 3/8x5 3/4
1 1/8
C
R-4689
18x27 1/4
2
2x6 3/4
1
C
R-4692-A
18x34
2 1/4
1 7/16x8
1
C
R-4698
18x36
1 3/4
2x4
1 3/8
A
R-4710
18x36
2
1 3/4x6 1/4
1 1/4
C
R-4711
18x39
2
1 1/4x5 1/2
1 1/4
C
R-4718
18 3/4x36 3/4
2
2x8
1
A
R-4730
19 1/2x32
1 1/2
2x5
1
A Ω
Catalog No.
A
B
G
H
Grate Type
Rectangular Heavy Duty
R-4731
19 1/2x39
1 1/2
2x4 1/2
1
C Ω
R-4732
19 1/2x39
1 3/4
1x7 1/2
1
A
R-4736
20x24
2
1 1/2x2 1/2
1 1/4
C
R-4738
20x24
2
1x5
1
A
R-4739
20x24
2
1 1/8x4 3/4
1
C
R-4740
20x28 1/2
2
1 3/4x8
1
C
R-4750
20x30
2
1 3/4x6
1
C
R-4750-1
20x48
2
1 1/2x5
1
A
R-4751
20 1/2x27
2
1 3/4x5 1/2
1
C
R-4752
20 1/2x36
1 7/8
1 5/8x5 3/4
1 1/8
C
R-4755-B
21x42
1 1/2
1 1/2x5 1/2
1
A
R-4755-C
21x42
1 1/2
1 1/2x5 7/8
1
C
R-4759
22x23
1 3/4
1 1/2x6
1
C
R-4762
22x30
1 1/2
2x6 1/4
1
C
R-4780
22x37
2
2x8
1
C
R-4781
22x48
2 1/2
1 5/8x5 3/8
1 1/4
C
R-4795
22 1/2x45
1 1/2
2x6
1
A
R-4798
23 1/4x36 1/2
2 3/4
1 1/2x7 1/4
1
C
R-4821-A
23 7/8x26
2
1 9/16x4 15/16
1 1/4
C
R-4825
24x30
1 1/2
1 1/2x4 1/4
1 1/4
C
R-4825-A
24x30
2 1/4
1 1/4x4 3/4
1
A
R-4825-B
24x30
2 1/4
1 1/2x6
1
C
R-4828
24x33
2 1/4
1x4 1/2
1
A
R-4829
24x33
2 1/4
1 1/2x6 1/2
1 1/4
C
R-4837
24x35
2 1/2
1 1/2x6 1/2
1 1/2
A
R-4839
24x35 7/8
1 3/4
7/8x9 3/4
1
A
R-4840
24x36
2
2x4 3/4
1
C
R-4843
24x36
1 3/4
1 3/4x6
1
A
R-4853
24x39
2 1/2
1 3/4x5 3/4
1 5/8
A
R-4853-A
24x45
3
1 1/2x6 1/4
1 1/4
A
R-4853-B1
24x51
3
1 1/2x5
1 1/4
C
R-4855
26x30
2
1 1/2x5
1 1/4
A
R-4856
26x32 3/8
4
3 3/8x3 5/8
7/8
C
R-4857
26x48
2
1 1/2x5 1/2
1
A
R-4890
28x37
2
1 3/4x7 5/8
1 1/4
C
R-4891
30x48
1 1/2
1 1/2x4 1/4
1 1/4
A*
R-4893
30x78
2
1 1/2x5
1 1/4
C**
R-4893-B
32x34
2
1x2
1
C
R-4894
33x36
2
1 1/2x6 1/2
1 1/4
C
R-4895-2
36x66
2
1 1/2x6 1/2
1 1/4
A
Convex
Ω Light Duty
* Grate in
two pieces.
** Grate in three pieces.
Angle frame available.
§ Not recommended for bicycle traffic.
Δ Meets traffic load called for in AA-6005 of 25,000# proof load.
