U-Bolts

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U-Bolts Definitions

(A) Thread Diamter Pitch

The diameter refers to the diameter of the bolt thread and does not also imply that the unthreaded part is the same diameter. Refer to our knowledgebase article on Cut-Thread versus Rolled-Thread for more information on this topic. The Thread Pitch indicates a distance between the threads which has different designations using the Imperial Standard (U.S. Standard) versus the Metric Standard. For more in-depth information, refer to our knowledgebase article on Imperial versus Metric Thread measurements. Imperial thread pitches are separated by a hyphen (a dash, “-“) such as ¼”-20 where ¼” is the diameter and “20” represents the number of threads counted in a 1” long thread. This designation may be confusing when fractional diameters with fractional diameters, i.e. 2¼”-4½ if presented 2-1/4”-4-1/2. Metric threads are usually separated by and “x” and may look diameter x pitch x length, i.e. M10 x 1.5 x 20mm . The internal nut threads will always be matched to the external bolt threads. If additional nuts are needed, the Imperial standard UNC-2B should be used except for Hot Dip Galvanized bolts which require Tapped-Oversize nuts due to excessive zinc buildup on the bolts.

(B) Inside Width

The inside width is measured between the threads and not measured between the unthreaded sections. Since U-Bolts are usually made from Rolled-Thread wire, the inside distance between the unthreaded legs will be somewhat wider but should not be considered if the fixture must pass the threads to be fastened in place.

(C) Distance Between Centers

An alternate method for measuring distance is between the U-Bolt centerlines. It is very important to subtract the entire thread diameter (2 halves) from the distance between centers. If this is not done, the U-Bolt will be too small.

(D) Tangent Leg Length

The U-shaped bolt comprises a half circle (the bend) and two straight legs called Tangent Legs. Only the tangent legs can be threaded. It is not practical to thread the entire tangent leg since the limitations of the bending equipment will damage the threads closest to the bend.

(E) Thread Length

When ordering our U-bolts for standard pipe sizes, thread is provided that assures the nuts can be tightened to any plate or bracket. Sometimes we are asked and must refuse to provide a threaded rod bent to the shape of a U-bolt. This is a misapplication of threaded rod since such bending will not only damage the threads but also overstresses the thread which could cause then U-Bolt to fail. When ordering custom u-bolts, be sure that the thread length is adequate to tighten your proposed fixture.

(F) Length Beyond Pipe

Sometimes fixturing requires longer tangent legs. For this reason, we present the leg length that extends beyond the pipe diameter. If our standard products are inadequate for your applications requirements, we will also manufacture to your specifications.

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Material/Finish (Mtrl/Fin)  
For Pipe Size (in)-FPS  
Thread ⌀ Pitch (in)-A  
Inside Width (in)-B  
Bolt ℄ (in) - C  
Tangent Leg Length (in)-D  
Inside Length (In Len.)  
Length Beyond Pipe (in)-F  
Thread Length (in)-E  
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  1. U-Bolts W/4 Nuts Steel-E.G. (Zinc Plated) For 24 in. Pipe 27.62 in. Inside Length
    U-Bolts W/4 Nuts Steel-E.G. (Zinc Plated) For 24 in. Pipe 27.62 in. Inside Length

    SKU: 3D-701-F20

    Special Price $120.00 Regular Price $189.60
  2. U-Bolts W/4 Nuts Steel-E.G. (Zinc Plated) For 20 in. Pipe 23.62 in. Inside Length
    U-Bolts W/4 Nuts Steel-E.G. (Zinc Plated) For 20 in. Pipe 23.62 in. Inside Length

    SKU: 3D-701-F19

    Special Price $105.50 Regular Price $166.69
  3. U-Bolts W/4 Nuts Steel-E.G. (Zinc Plated) For 18 in. Pipe 21.62 in. Inside Length
    U-Bolts W/4 Nuts Steel-E.G. (Zinc Plated) For 18 in. Pipe 21.62 in. Inside Length

    SKU: 3D-701-F18

    Special Price $100.00 Regular Price $158.00
  4. U-Bolts W/4 Nuts Steel-E.G. (Zinc Plated) For 12 in. Pipe 16 in. Inside Length
    U-Bolts W/4 Nuts Steel-E.G. (Zinc Plated) For 12 in. Pipe 16 in. Inside Length

    SKU: 3D-701-F15

    Special Price $35.00 Regular Price $55.30
  5. U-Bolts W/4 Nuts Plain Steel-Light Oil For 24 in. Pipe 27.62 in. Inside Length
    U-Bolts W/4 Nuts Plain Steel-Light Oil For 24 in. Pipe 27.62 in. Inside Length

    SKU: 3D-701-D20

    Special Price $119.97 Regular Price $189.54
  6. U-Bolts W/4 Nuts Plain Steel-Light Oil For 20 in. Pipe 23.62 in. Inside Length
    U-Bolts W/4 Nuts Plain Steel-Light Oil For 20 in. Pipe 23.62 in. Inside Length

    SKU: 3D-701-D19

    Special Price $106.38 Regular Price $168.07
  7. U-Bolts W/4 Nuts Plain Steel-Light Oil For 18 in. Pipe 21.62 in. Inside Length
    U-Bolts W/4 Nuts Plain Steel-Light Oil For 18 in. Pipe 21.62 in. Inside Length

    SKU: 3D-701-D18

    Special Price $99.78 Regular Price $157.64
  8. U-Bolts W/4 Nuts Plain Steel-Light Oil For 16 in. Pipe 19.25 in. Inside Length
    U-Bolts W/4 Nuts Plain Steel-Light Oil For 16 in. Pipe 19.25 in. Inside Length

    SKU: 3D-701-D17

    Special Price $67.60 Regular Price $106.81
  9. U-Bolts W/4 Nuts Plain Steel-Light Oil For 14 in. Pipe 17.25 in. Inside Length
    U-Bolts W/4 Nuts Plain Steel-Light Oil For 14 in. Pipe 17.25 in. Inside Length

    SKU: 3D-701-D16

    Special Price $53.88 Regular Price $85.12
  10. U-Bolts W/4 Nuts Plain Steel-Light Oil For 12 in. Pipe 16 in. Inside Length
    U-Bolts W/4 Nuts Plain Steel-Light Oil For 12 in. Pipe 16 in. Inside Length

    SKU: 3D-701-D15

    Special Price $40.67 Regular Price $64.26
  11. U-Bolts W/4 Nuts Plain Steel-Light Oil For 10 in. Pipe 13.75 in. Inside Length
    U-Bolts W/4 Nuts Plain Steel-Light Oil For 10 in. Pipe 13.75 in. Inside Length

    SKU: 3D-701-D14

    Special Price $32.28 Regular Price $50.99
  12. U-Bolts W/4 Nuts Plain Steel-Light Oil For 8 in. Pipe 11.43 in. Inside Length
    U-Bolts W/4 Nuts Plain Steel-Light Oil For 8 in. Pipe 11.43 in. Inside Length

    SKU: 3D-701-D13

    Special Price $15.62 Regular Price $24.68
  13. U-Bolts W/4 Nuts Plain Steel-Light Oil For 6 in. Pipe 9.43 in. Inside Length
    U-Bolts W/4 Nuts Plain Steel-Light Oil For 6 in. Pipe 9.43 in. Inside Length

    SKU: 3D-701-D12

    Special Price $13.66 Regular Price $21.57
  14. U-Bolts W/4 Nuts Plain Steel-Light Oil For 5 in. Pipe 7.78 in. Inside Length
    U-Bolts W/4 Nuts Plain Steel-Light Oil For 5 in. Pipe 7.78 in. Inside Length

    SKU: 3D-701-D11

    Special Price $7.39 Regular Price $11.68