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Selecting U-Bolts Using Pipe, Conduit, or Tubing Trade Size
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Clamping U-Bolts
With Steel and Stainless Steel Mounting Plate
With Plastic Mounting Plate
Also known as muffler clamps, these U-bolts have a rounded mounting plate that fully surrounds pipe, conduit, and tubing for a secure fit. Stronger than routing clamps and hangers, U-bolts support heavy pipe, tube, and conduit from ceilings, walls, and poles.
Zinc-plated steel U-bolts have good corrosion resistance in most environments. Chrome-plated steel U-bolts are more corrosion resistant than zinc-plated steel U-bolts. 304 stainless steel U-bolts have excellent corrosion resistance and good chemical resistance.
U-bolts with four nuts allow you to secure the U-bolt from the top and the bottom.
For technical drawings and 3-D models, click on a part number.
ID | Thread | Mounting Plate | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Inch | Metric, mm | For Pipe Size  | Ht. | Lg. | Pitch, mm | Ctr.-to-Ctr. | Material | Color | Lg. | Wd. | Thick. | No. of Nuts Included | Temp. Range, °F | Pkg. Qty. | Pkg. | |
Steel | ||||||||||||||||
1/4"-20 Thread Size | ||||||||||||||||
| 9/16" | 14 | 1/4 | 1 7/16" | 3/4" | __ | 13/16" | Steel | __ | 1 9/16" | 7/16" | 11/32" | 2 | __ | 10 | 00000000 | 000000 |
| 11/16" | 17 | 3/8 | 1 7/16" | 3/4" | __ | 1" | Steel | __ | 1 9/16" | 7/16" | 9/32" | 2 | __ | 10 | 00000000 | 00000 |
| 7/8" | 22 | 1/2 | 1 7/16" | 3/4" | __ | 1 1/16" | Steel | __ | 1 9/16" | 3/8" | 3/16" | 2 | __ | 10 | 00000000 | 00000 |
| 1 1/8" | 29 | 3/4 | 1 1/2" | 3/4" | __ | 1 3/8" | Steel | __ | 1 13/16" | 7/16" | 3/16" | 2 | __ | 10 | 00000000 | 00000 |
5/16"-18 Thread Size | ||||||||||||||||
| 1 5/16" | 33 | __ | 2" | 1" | __ | 1 5/8" | Steel | __ | 2 5/16" | 9/16" | 1/4" | 2 | __ | 1 | 0000000 | 0000 |
| 1 7/16" | 37 | 1 | 2 1/8" | 1" | __ | 1 3/4" | Steel | __ | 2 7/16" | 9/16" | 1/4" | 2 | __ | 1 | 0000000 | 0000 |
| 1 9/16" | 40 | __ | 2 1/4" | 1" | __ | 1 7/8" | Steel | __ | 2 9/16" | 9/16" | 1/4" | 2 | __ | 1 | 0000000 | 0000 |
| 1 5/8" | 41 | __ | 2 1/2" | 1" | __ | 1 15/16" | Steel | __ | 2 11/16" | 9/16" | 11/32" | 2 | __ | 1 | 0000000 | 0000 |
| 1 3/4" | 44 | 1 1/4 | 2 9/16" | 1" | __ | 2 1/16" | Steel | __ | 2 7/8" | 9/16" | 5/16" | 2 | __ | 1 | 0000000 | 0000 |
| 1 7/8" | 48 | __ | 2 7/8" | 1" | __ | 2 3/16" | Steel | __ | 2 7/8" | 9/16" | 5/16" | 2 | __ | 1 | 0000000 | 0000 |
| 2" | 51 | 1 1/2 | 2 7/8" | 1" | __ | 2 5/16" | Steel | __ | 3" | 9/16" | 5/16" | 2 | __ | 1 | 0000000 | 0000 |
| 2 1/8" | 54 | __ | 3 1/16" | 1" | __ | 2 7/16" | Steel | __ | 3 1/8" | 9/16" | 1/4" | 2 | __ | 1 | 0000000 | 0000 |
| 2 1/4" | 57 | __ | 3 1/8" | 1" | __ | 2 9/16" | Steel | __ | 3 3/8" | 9/16" | 3/8" | 2 | __ | 1 | 0000000 | 0000 |
| 2 3/8" | 60 | 2 | 3 5/16" | 1" | __ | 2 11/16" | Steel | __ | 3 3/8" | 9/16" | 5/16" | 2 | __ | 1 | 0000000 | 0000 |
| 2 5/8" | 67 | __ | 3 9/16" | 1 1/4" | __ | 2 15/16" | Steel | __ | 3 5/8" | 9/16" | 5/16" | 2 | __ | 1 | 0000000 | 0000 |
3/8"-16 Thread Size | ||||||||||||||||
| 2 1/8" | 54 | __ | 3 11/16" | 1 1/2" | __ | 2 1/2" | Steel | __ | 3 1/8" | 5/8" | 11/16" | 2 | __ | 1 | 0000000 | 0000 |
| 2 3/8" | 60 | 2 | 3 13/16" | 1 1/2" | __ | 2 3/4" | Steel | __ | 3 3/8" | 5/8" | 11/16" | 2 | __ | 1 | 0000000 | 0000 |
| 2 5/8" | 67 | __ | 4 1/16" | 1 1/2" | __ | 3" | Steel | __ | 3 5/8" | 9/16" | 23/32" | 2 | __ | 1 | 0000000 | 0000 |
| 2 7/8" | 73 | 2 1/2 | 4 5/16" | 1 1/2" | __ | 3 1/4" | Steel | __ | 3 7/8" | 5/8" | 11/16" | 2 | __ | 1 | 0000000 | 0000 |
| 3 1/8" | 79 | __ | 4 9/16" | 1 1/2" | __ | 3 1/2" | Steel | __ | 4 1/8" | 5/8" | 21/32" | 2 | __ | 1 | 0000000 | 0000 |
| 3 3/8" | 86 | __ | 4 13/16" | 1 1/2" | __ | 3 3/4" | Steel | __ | 4 5/16" | 9/16" | 11/16" | 2 | __ | 1 | 0000000 | 0000 |
| 3 5/8" | 92 | 3 | 5 1/16" | 1 1/2" | __ | 4" | Steel | __ | 4 5/8" | 9/16" | 11/16" | 2 | __ | 1 | 0000000 | 0000 |
| 4 1/8" | 105 | 3 1/2 | 5 7/8" | 1 1/2" | __ | 4 1/2" | Steel | __ | 5 1/8" | 5/8" | 11/16" | 2 | __ | 1 | 0000000 | 0000 |
| 4 5/8" | 117 | 4 | 6 3/16" | 1 1/2" | __ | 5" | Steel | __ | 5 5/8" | 5/8" | 23/32" | 2 | __ | 1 | 0000000 | 0000 |
| 5 1/8" | 130 | __ | 6 13/16" | 1 1/2" | __ | 5 1/2" | Steel | __ | 6 3/16" | 11/16" | 25/32" | 2 | __ | 1 | 0000000 | 0000 |
| 5 5/8" | 143 | 5 | 7 1/8" | 1 1/2" | __ | 6" | Steel | __ | 6 11/16" | 11/16" | 21/32" | 2 | __ | 1 | 0000000 | 0000 |
| 6 1/8" | 156 | __ | 7 1/2" | 1 1/2" | __ | 6 1/2" | Steel | __ | 7 3/16" | 11/16" | 13/16" | 2 | __ | 1 | 0000000 | 0000 |
| 7 1/8" | 181 | __ | 8 13/16" | 1 3/4" | __ | 7 1/2" | Steel | __ | 8 3/4" | 1" | 19/32" | 2 | __ | 1 | 00000000 | 00000 |
| 8 1/8" | 206 | __ | 9 11/16" | 1 3/4" | __ | 8 1/2" | Steel | __ | 9 3/4" | 1" | 19/32" | 2 | __ | 1 | 00000000 | 00000 |
Zinc-Plated Steel | ||||||||||||||||
1/4"-20 Thread Size | ||||||||||||||||
| 9/16" | 14 | 1/4 | 1 7/16" | 3/4" | __ | 13/16" | Zinc-Plated Steel | __ | 1 9/16" | 7/16" | 11/32" | 2 | __ | 10 | 00000000 | 00000 |
| 11/16" | 17 | 3/8 | 1 7/16" | 3/4" | __ | 1" | Zinc-Plated Steel | __ | 1 9/16" | 7/16" | 9/32" | 2 | __ | 10 | 00000000 | 00000 |
| 7/8" | 22 | 1/2 | 1 7/16" | 3/4" | __ | 1 1/16" | Zinc-Plated Steel | __ | 1 9/16" | 3/8" | 3/16" | 2 | __ | 10 | 00000000 | 00000 |
| 1 1/8" | 29 | 3/4 | 1 1/2" | 3/4" | __ | 1 3/8" | Zinc-Plated Steel | __ | 1 13/16" | 7/16" | 3/16" | 2 | __ | 10 | 00000000 | 00000 |
5/16"-18 Thread Size | ||||||||||||||||
| 1 5/16" | 33 | __ | 2" | 1" | __ | 1 5/8" | Zinc-Plated Steel | __ | 2 5/16" | 9/16" | 1/4" | 2 | __ | 1 | 0000000 | 0000 |
| 1 7/16" | 37 | 1 | 2 1/8" | 1" | __ | 1 3/4" | Zinc-Plated Steel | __ | 2 7/16" | 9/16" | 1/4" | 2 | __ | 1 | 0000000 | 0000 |
| 1 9/16" | 40 | __ | 2 1/4" | 1" | __ | 1 7/8" | Zinc-Plated Steel | __ | 2 9/16" | 9/16" | 1/4" | 2 | __ | 1 | 0000000 | 0000 |
| 1 5/8" | 41 | __ | 2 1/2" | 1" | __ | 1 15/16" | Zinc-Plated Steel | __ | 2 11/16" | 9/16" | 11/32" | 2 | __ | 1 | 0000000 | 0000 |
| 1 3/4" | 44 | 1 1/4 | 2 9/16" | 1" | __ | 2 1/16" | Zinc-Plated Steel | __ | 2 7/8" | 9/16" | 5/16" | 2 | __ | 1 | 0000000 | 0000 |
| 1 7/8" | 48 | __ | 2 7/8" | 1" | __ | 2 3/16" | Zinc-Plated Steel | __ | 2 7/8" | 9/16" | 5/16" | 2 | __ | 1 | 0000000 | 0000 |
| 2" | 51 | 1 1/2 | 2 7/8" | 1" | __ | 2 5/16" | Zinc-Plated Steel | __ | 3" | 9/16" | 5/16" | 2 | __ | 1 | 0000000 | 0000 |
| 2 1/8" | 54 | __ | 3 1/16" | 1" | __ | 2 7/16" | Zinc-Plated Steel | __ | 3 1/8" | 9/16" | 1/4" | 2 | __ | 1 | 0000000 | 0000 |
| 2 1/4" | 57 | __ | 3 1/8" | 1" | __ | 2 9/16" | Zinc-Plated Steel | __ | 3 3/8" | 9/16" | 3/8" | 2 | __ | 1 | 0000000 | 0000 |
| 2 3/8" | 60 | 2 | 3 5/16" | 1" | __ | 2 11/16" | Zinc-Plated Steel | __ | 3 3/8" | 9/16" | 5/16" | 2 | __ | 1 | 0000000 | 0000 |
| 2 5/8" | 67 | __ | 3 9/16" | 1 1/4" | __ | 2 15/16" | Zinc-Plated Steel | __ | 3 5/8" | 9/16" | 5/16" | 2 | __ | 1 | 0000000 | 0000 |
3/8"-16 Thread Size | ||||||||||||||||
| 2 1/8" | 54 | __ | 3 11/16" | 1 1/2" | __ | 2 1/2" | Zinc-Plated Steel | __ | 3 1/8" | 5/8" | 11/16" | 2 | __ | 1 | 0000000 | 0000 |
| 2 3/8" | 60 | 2 | 3 13/16" | 1 1/2" | __ | 2 3/4" | Zinc-Plated Steel | __ | 3 3/8" | 5/8" | 11/16" | 2 | __ | 1 | 0000000 | 0000 |
| 2 5/8" | 67 | __ | 4 1/16" | 1 1/2" | __ | 3" | Zinc-Plated Steel | __ | 3 5/8" | 9/16" | 23/32" | 2 | __ | 1 | 0000000 | 0000 |
| 2 7/8" | 73 | 2 1/2 | 4 5/16" | 1 1/2" | __ | 3 1/4" | Zinc-Plated Steel | __ | 3 7/8" | 5/8" | 11/16" | 2 | __ | 1 | 0000000 | 0000 |
| 3 1/8" | 79 | __ | 4 9/16" | 1 1/2" | __ | 3 1/2" | Zinc-Plated Steel | __ | 4 1/8" | 5/8" | 21/32" | 2 | __ | 1 | 0000000 | 0000 |
| 3 3/8" | 86 | __ | 4 13/16" | 1 1/2" | __ | 3 3/4" | Zinc-Plated Steel | __ | 4 5/16" | 9/16" | 11/16" | 2 | __ | 1 | 0000000 | 0000 |
| 3 5/8" | 92 | 3 | 5 1/16" | 1 1/2" | __ | 4" | Zinc-Plated Steel | __ | 4 5/8" | 9/16" | 11/16" | 2 | __ | 1 | 0000000 | 0000 |
| 4 1/8" | 105 | 3 1/2 | 5 7/8" | 1 1/2" | __ | 4 1/2" | Zinc-Plated Steel | __ | 5 1/8" | 5/8" | 11/16" | 2 | __ | 1 | 0000000 | 0000 |
| 4 5/8" | 117 | 4 | 6 3/16" | 1 1/2" | __ | 5" | Zinc-Plated Steel | __ | 5 5/8" | 5/8" | 23/32" | 2 | __ | 1 | 0000000 | 0000 |
| 5 1/8" | 130 | __ | 6 13/16" | 1 1/2" | __ | 5 1/2" | Zinc-Plated Steel | __ | 6 3/16" | 11/16" | 25/32" | 2 | __ | 1 | 0000000 | 0000 |
| 5 5/8" | 143 | 5 | 7 1/8" | 1 1/2" | __ | 6" | Zinc-Plated Steel | __ | 6 11/16" | 11/16" | 21/32" | 2 | __ | 1 | 0000000 | 0000 |
| 6 1/8" | 156 | __ | 7 1/2" | 1 1/2" | __ | 6 1/2" | Zinc-Plated Steel | __ | 7 3/16" | 11/16" | 13/16" | 2 | __ | 1 | 0000000 | 0000 |
| 7 1/8" | 181 | __ | 8 13/16" | 1 3/4" | __ | 7 1/2" | Zinc-Plated Steel | __ | 8 3/4" | 1" | 19/32" | 2 | __ | 1 | 00000000 | 00000 |
| 8 1/8" | 206 | __ | 9 11/16" | 1 3/4" | __ | 8 1/2" | Zinc-Plated Steel | __ | 9 3/4" | 1" | 19/32" | 2 | __ | 1 | 00000000 | 00000 |
M10 Thread Size | ||||||||||||||||
| 1 3/16" | 30 | 3/4 | 2 3/8" | 1 5/8" | 1.5 | 1 9/16" | Plastic | Black | 2 15/16" | 1 3/16" | 1/2" | 4 | -20° to 190° F | 1 | 0000000 | 0000 |
| 1 1/2" | 38 | 1 | 2 9/16" | 1 5/8" | 1.5 | 1 7/8" | Plastic | Black | 3 1/8" | 1 3/16" | 1/2" | 4 | -20° to 190° F | 1 | 0000000 | 0000 |
| 1 13/16" | 46 | 1 1/4 | 3" | 2" | 1.5 | 2 3/16" | Plastic | Black | 3 9/16" | 1 3/16" | 1/2" | 4 | -20° to 190° F | 1 | 0000000 | 0000 |
| 2 1/16" | 52 | 1 1/2 | 3 1/4" | 2" | 1.5 | 2 7/16" | Plastic | Black | 3 3/4" | 1 3/8" | 19/32" | 4 | -20° to 190° F | 1 | 0000000 | 0000 |
M12 Thread Size | ||||||||||||||||
| 2 1/2" | 64 | 2 | 3 13/16" | 2 3/8" | 1.75 | 3" | Plastic | Black | 4 5/16" | 1 3/8" | 19/32" | 4 | -20° to 190° F | 1 | 0000000 | 00000 |
| Each | ||||||||||||||||
| 3 1/16" | 78 | 2 1/2 | 4 13/16" | 3" | 1.75 | 3 11/16" | Plastic | Green | 5 5/16" | 1 3/8" | 19/32" | 4 | -20° to 190° F | __ | 00000000 | 00000 |
| Pkg. | ||||||||||||||||
| 3 1/4" | 83 | __ | 4 1/2" | 2 3/8" | 1.75 | 3 11/16" | Plastic | Black | 5 5/16" | 1 3/8" | 19/32" | 4 | -20° to 190° F | 1 | 0000000 | 00000 |
| 3 11/16" | 94 | 3 | 5" | 2 3/8" | 1.75 | 4 3/16" | Plastic | Black | 5 11/16" | 1 9/16" | 13/16" | 4 | -20° to 190° F | 1 | 0000000 | 00000 |
M16 Thread Size | ||||||||||||||||
| 4 3/4" | 121 | 4 | 6 1/8" | 3 3/16" | 2 | 5 3/8" | Plastic | Black | 7 1/2" | 1 9/16" | 13/16" | 4 | -20° to 190° F | 1 | 0000000 | 00000 |
| 5 13/16" | 148 | 5 | 6 15/16" | 3 3/16" | 2 | 6 7/16" | Plastic | Black | 8 11/16" | 1 9/16" | 13/16" | 4 | -20° to 190° F | 1 | 0000000 | 00000 |
| 6 15/16" | 176 | 6 | 7 15/16" | 3 3/16" | 2 | 7 9/16" | Plastic | Black | 10" | 1 15/16" | 1" | 4 | -20° to 190° F | 1 | 0000000 | 00000 |
| Each | ||||||||||||||||
M20 Thread Size | ||||||||||||||||
| 8 3/4" | 222 | 8 | 11 7/16" | 4 15/16" | 2.5 | 9 3/4" | Plastic | Green | 12 3/8" | 2" | 31/32" | 4 | -20° to 190° F | __ | 00000000 | 00000 |
| 10 7/8" | 276 | 10 | 13 9/16" | 4 15/16" | 2.5 | 11 7/8" | Plastic | Green | 14 9/16" | 2" | 31/32" | 4 | -20° to 190° F | __ | 00000000 | 00000 |
| 12 15/16" | 329 | 12 | 15 11/16" | 4 15/16" | 2.5 | 13 7/8" | Plastic | Green | 16 9/16" | 2 3/8" | 1 3/16" | 4 | -20° to 190° F | __ | 00000000 | 00000 |
M24 Thread Size | ||||||||||||||||