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U Bolt Standard Sizes

U Bolt Standard Sizes


Table Of Content


What is U Bolt?

U bolt are most popular type of pipe support. A round threaded bar length which is bent into a "U" shape. Square u bolts design to fastening a tube or pipe to a surface, That means U shaped bolt can secure tubes or piping to a support and work as a restraint. Custom u bolts made by various materials such a stainless steel, carbon steel, nickel alloy, duplex and super duplex, ensuring long lasting and durability. Heavy duty u bolts come in many coating like a zinc plating, hot dip galvanization, xylan, teflon, and PTFE coating. Small u bolts are used to provide lateral restraints to pipes. U bolt clamp are reliable under heavy duty and high pressure applications. U shape bolts are widely used in construction, electrical work, automotive, and plumbing.


Explained Square U Bolts Length Chart for Construction


U Bolt Standard Sizes

SIZE Thread Diameter Inside Length Inside Width
Our "T" Our "A" Our "B" Our "C"
1/2 2 1 3/4" 1/2" 3 5/8" 27/16"
1/2 3 2" 1/2" 4 1/2" 3 9/16"
1/4 1 1 1/8" 1/4" 2 1/4" 1 3/8"
1/4 2 11/2" 1/4" 3 1/2" 27/16"
2 1/2 2" 1/2" 4 1/8" 3"
3/8 x 1/2 1" 3/8" 1 3/4" 15/16"
3/8 x 1 1 1/8" 3/8" 27/16" 1 3/8"
3/8 x 2 1 3/4" 3/8" 3 5/8" 2 7/16"
3/8 x 4 2" 3/8" 5 3/4" 4 9/16"
3/8 x 6 3" 3/8" 8" 6 5/8"
3/8 x 8 3" 3/8" 10 1/4" 8 3/4"
5/16 1/2 1" 5/16" 1 3/4" 15/16"
5/16 3/4 1 1/8" 5/16" 2" 1 1/8"
5/16 1 1/8" 5/16" 27/16" 1 3/8"
5/16 2 1 1/2" 5/16" 3 1/2" 2 7/16"

U Bolt Length Chart

Pipe Size In (Inches) Thread Length In (Inches) Diameter In (Inches) Length In (Inches) C Hook In (Inches)
30 4-3/4 1 33-11/16 30-1/8
24 4-3/4 1 27-11/16 24-1/8
20 4-3/4 1 23-11/16 20-1/8
18 4-3/4 1 21-11/16 18-1/8
16 4-1/4 7/8 19-5/16 16-1/8
14 4-1/4 7/8 17-5/16 14-1/8
12 4-1/4 7/8 16-1/16 12-7/8
10 4 3/4 13-13/16 10-7/8
8 3-3/4 5/8 11-1/2 8-3/4
6 3-3/4 5/8 9-1/2 6-3/4
5 3 1/2 7-13/16 5-5/8
4 3 1/2 6-13/16 4-9/16
3 3 1/2 5-13/16 3-9/16
2 2-1/2 3/8 4-1/2 2-7/16
1-1/2 2-1/2 3/8 4 2
1 2-3/8 1/4 3-7/16 1-3/8
1/2 2-3/8 1/4 3-1/4 15/16

Square U Bolt Sizes

Square U Bolt Sizes

Sizes in
(B x C)		 Thread Length in
(D)
3/8"-16 (A)
4" x 6" 3"
3" x 6" 3"
3" x 4" 2"
4" x 3" 1-1/2"
3" x 7" 3"
5/16"-18 (A)
2" x 7" 3"
2" x 5" 3"
2" x 3" 1-1/2"

Round U Bolts Sizes

Diameter in (Inches) Length in (Inches) Width in (Inches)
1⁄2" 4-1⁄2" 3-1⁄2"
1⁄2" 6-1⁄2" 2-3⁄4"
1⁄2" 6-3⁄4" 2-1⁄2"
1⁄2" 6-3⁄4" 3"
1⁄2" 7" 3-1⁄4"
1⁄2" 8-1⁄2" 2-3⁄4"
1⁄2" 8-1⁄2" 3"
1⁄2" 11" 2-3⁄4"
1⁄2" 11-1⁄2" 3"
1⁄2" 12-1⁄2" 2-3⁄4"
1⁄2" 14" 2-3⁄4"
3⁄4" 15" 3-5⁄8"
5⁄16" 2" 1-1⁄4"
5⁄16" 2-1⁄4" 1-1⁄2"
3⁄8" 3-3⁄4" 3-1⁄4"
5⁄8" 8" 2-3⁄4"
5⁄8" 8" 3"
5⁄8" 10" 3"
5⁄8" 10" 3-5⁄8"
5⁄8" 12" 3-5⁄8"
5⁄8" 14-1⁄2" 3-1⁄2"
5⁄8" 15" 3-5⁄8"
5⁄8" 12" 3"
5⁄8" 16" 4"
5⁄8" 18-1⁄2" 3-5⁄8"
9⁄16" 7" 2-3⁄4"
9⁄16" 7-1⁄2" 3"
9⁄16" 9-1⁄2" 3"
9⁄16" 10" 3-1⁄4"
9⁄16" 12-1⁄2" 3-1⁄4"
9⁄16" 12-1⁄2" 3-1⁄2"
9⁄16" 14" 3-1⁄4"
9⁄16" 12-1⁄2" 4"
9⁄16" 14-1⁄2" 4"
9⁄16" 16-1⁄4" 4"

BS 3974 U Bolts Sizes

Pipe Sizes Outside Daimeter Pipe Metric Dia of Rod Inside ID Thread Radius Center ID
Inches (MM) (MM) D ID T R C/ID
(MM) (MM) Ins LD (MM) (MM) (MM)
24" 610 600 24 70 712 640 616
22" 569 550 24 70 662 590 586
20" 508 500 24 70 612 540 516
16" 406.4 400 24 65 512 435 411
14" 355.6 350 24 65 452 385 361
12" 323.9 300 20 60 410 350 330
10" 273 250 20 60 360 300 280
18" 457 450 24 70 552 485 461
9" 244.5 225 20 55 320 270 250
8" 219.1 200 20 55 305 245 225
7" 193.7 175 20 55 270 215 195
6" 168.3 150 20 55 245 190 170
5" 139.7 125 16 50 208 160 144
4" 114.3 100 16 50 183 135 119
3" 88.9 80 16 50 158 105 89
2.5" 76.1 65 12 45 136 90 78
2" 60.3 50 10 35 105 75 65
1.5" 48.3 40 10 35 95 60 50
1" 33.7 25 8 25 69 45 37
0.75" 26.9 20 8 25 64 35 27
0.5" 21.3 15 8 25 54 30 22

Beginner's Guide to Custom U Bolts Design and Finishes as per ASME B18 31.5


What Finishes are Available for Standard U Bolts?

  • Zinc-plated
  • Hot dipped galvanized
  • Plain finish
  • Hot dipped galvanized Pro-Coat™
  • Teflon Blue
  • Low carbon steel

Hot Dip Galvanized Square Bend U Bolts Sizes

Thread Diameter (A) Thread Length (T) Overall Length (B) Inside Width (C) Lbs/100
3/8"-16 5-5/8" 9" 6" 57
3/8"-16 3-3/4" 7" 6" 48
3/8"-16 3-3/4" 7" 4" 43.5
3/8"-16 3" 5" 6" 38.5
3/8"-16 3-3/4" 7" 2" 38.5
3/8"-16 3" 5" 4" 33.5
3/8"-16 3" 5" 2" 29
3/8"-16 1-1/2" 3" 4" 23.5
3/8"-16 1-1/2" 3" 2" 19

Zinc Plated Square Bend U Bolts Sizes

Thread Diameter (A) Thread Length (T) Overall Length (B) Inside Width (C) Lbs/100
3/8"-16 5-5/8" 9" 6" 57
3/8"-16 3-3/4" 7" 6" 48
3/8"-16 3-3/4" 7" 4" 43.5
3/8"-16 3-3/4" 7" 2" 38.5
3/8"-16 3" 5" 6" 38.5
3/8"-16 3" 5" 4" 33.5
3/8"-16 1-1/2" 3" 4" 23.5
3/8"-16 1-1/2" 5" 2" 19
3/8"-16 1-1/2" 3" 2" 19

Heavy Pattern U Bolts Size Chart

Nominal Pipe Size (NPS) Size of Thread Thread of Length in (MM) Between Centres in (MM) Depth of U in (MM)
24" M24 70 640 688
22" M24 70 590 638
20" M24 70 540 588
18" M24 70 485 528
16" M24 65 435 488
14" M24 65 385 428
12" M20 60 350 390
10" M20 60 300 340
9" M20 55 270 300
8" M20 55 245 285
7" M20 55 215 250
6" M20 55 190 225
5" M16 50 160 192
4" M16 50 135 167
3" M16 50 105 142
3/4" M8 25 35 56
2.1/2" M12 45 90 124
2" M10 35 75 95
1.1/2" M10 35 60 85
1" M8 25 45 61
1/2" M8 25 30 46

U Bolt Design

U Bolt Design

How Do I Know Which U-bolt Clamp Size is Right for My Project?

How Do I Know Which U-bolt Clamp Size is Right for My Project?

Can Heavy Duty U Bolts Be Custom Made to Specific Sizes?

Yes, U-bolts Can Be Custom-made to Specific Materials, Finishes and Sizes for Unique Applications.


What Factors Influence U Bolt Standard Sizes Selection?

How Do I Know Which U-bolt Clamp Size is Right for My Project?

What is the Application of Custom U Bolts?

  • Automotive Components Achieved
  • Antenna Section Secured
  • Roofing Stability
  • Wire Cable Fixation
  • Building and Construction

What Are the Types of U Shaped Bolt?

What Are the Types of U Shaped Bolt?

What Are the Key Elements in the Diagram of Small U Bolts?

  • Leg length (A)
  • Inside width (B)
  • Rod diameter (C)
  • Thread Length (D)