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Drain Grate:

Square and Rectangular

     
 Drawing  Grate A   Grate B
     
     
Grate C Grate Q Grate S
 

Heavy Duty (unless noted otherwise)

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.

Specify: 1. Catalog number.

2. R-4899 angle frame when required.

3. Perma-Grip surface if required.

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. 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
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
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 † Ä 
R-4859-S  27 1/2x27 1/2  1 1 1/2x4 3/4  1 S † ** Ä 
R-4871  27 1/2x27 1/2  1 2x24  1 B † § Ä 
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. Grate Type
Rectangular— Heavy Duty   
R-4389-O  6x12  1 1/4 3/4x4  1
R-4390  6x24  1 3/4x4 1/2  1
R-4403  8x14  1 1 1/2x2 1/8   1/2
R-4404-C  8x24  1 1 1/16x5 7/8  1
R-4406  8x24  1 3/4 1 5/16x6  1
R-4406-1  8x24  1 3/4 1x2 5/8   3/4
R-4406-2  8x24  1 3/4 1x5  1
R-4406-C  9 1/4x23 7/8  1 1x2 7/8  1
R-4407-2A  9 1/2x24  1 3/4 1x7 1/2  1
R-4409  10x17 3/4  1 1/2 1x3 1/2  1
R-4409-A  10x24  1 3/4 1 1/4x4 3/4  1
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
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
R-4424  10 1/2x23 1/8  1 3/4 2x2  1
R-4430-A  11x24  1 1/2 3/4x4 1/8   3/4
R-4430-B  11 1/2x24  1 1/2 1x6 5/8  1
R-4435-1  11 7/8x14  2 1x5 1/2  1
R-4443  12x14  1 3/4 1 1/2x5 1/4  1 1/4
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
R-4460  12x30  2 1 1/4x4  1 A † 
Catalog No. 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
R-4531  14 1/2x23 7/8  1 1x5  1
R-4540  14 1/2x26 1/2  2 2 1/4x4  1
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
R-4545  14 1/2x48  1 3/4 1 1/4x5  1 1/4
R-4548  15x20 1/2  1 1/2 2x2   3/4
R-4570-1  15x23  1 3/4 1 1/2x5 1/2  1 1/8
R-4570-2  15x23 7/8  1 1/2 1x6  1
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
R-4583  15 1/2x22 1/4  1 3/4 1 5/8x5 1/2  1 3/8
R-4584  15 1/2x36  1 3/4 1 1/2x5 1/4  1 3/8
R-4585  15 1/2x39  1 3/4 1 7/8x5 7/8  1 1/4
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
R-4603-A  16x24  1 1/8 3/4x5 1/2  1 A † 
R-4604  16x24  1 1/2 2x4   7/8
R-4604-C  16x24  2 2x5  2 A † 
R-4604-D  16x24  2 1/2 2 1/2x6 5/8   3/4
R-4608  16 1/2x19 3/4  1 1/2 1 1/4x6  1
R-4610  16 1/2x22  1 3/4 1 1/2x4  1
R-4620  17x19  2 1 1/4x4 1/4  1 1/8
R-4630  17x20  1 1/2 1 1/4x6 1/2  1
R-4632  17x21  2 1 3/8x8 3/4  1
R-4640  17x21 1/2  1 3/4 2 1/2x4 1/4  1
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
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
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
R-4730  19 1/2x32  1 1/2 2x5  1 A Ù 
Catalog No. Grate Type
Rectangular — Heavy Duty   
R-4731  19 1/2x39  1 1/2 2x4 1/2  1 C Ù 
R-4732  19 1/2x39  1 3/4 1x7 1/2  1
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
R-4751  20 1/2x27  2 1 3/4x5 1/2  1
R-4752  20 1/2x36  1 7/8 1 5/8x5 3/4  1 1/8
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
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
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
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
R-4853-A  24x45  3 1 1/2x6 1/4  1 1/4
R-4853-B1  24x51  3 1 1/2x5  1 1/4
R-4855  26x30  2 1 1/2x5  1 1/4
R-4856  26x32 3/8  4 3 3/8x3 5/8   7/8
R-4857  26x48  2 1 1/2x5 1/2  1
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
• 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.
 
Free Open Area Tables
To Calculate Drainage Water Flow
Listed by Product Number

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