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U-Bolt & Pad Fit Chart

Insulated pipe U-bolts and the pads they seat on — the size of each, and the one measurement that has to match.

A pad sits between the pipe and the steel, so the pipe never rubs on the support. The pad has two holes and the U-bolt’s legs pass down through them — so a pad only fits a U-bolt when the holes line up with the legs. Find your pipe size and rod below; a Shop link means we carry that size.

Leg C-C = inside width + rod diameter. A pad fits a U-bolt when its hole C-C (center of one hole to the center of the other) equals the U-bolt’s leg C-C. Same pipe size is not always enough: a 1″ pipe takes a different pad on 1/4″ rod than on 3/8″ rod.

U-bolt
Inside widthInside lengthThread lengthLeg C-CRod diameter& thread (UNC)
Pad · top view and end view
LengthHole C-CWidthHeightend view
The pipe rests on the pad’s rounded face; the U-bolt’s legs pass down through the two holes. Drawings show what each chart column measures — not to scale.
Download the printable chart (PDF)
Insulated U-bolts — round bend, coarse thread (UNC)
Pipe sizeWe carryThreadInside widthInside lengthThread lengthLeg C-C
1/2″Shop1/4-20 UNC15/16″3-5/16″2-3/8″1-3/16″
3/4″Shop1/4-20 UNC1-1/8″3-7/16″2-3/8″1-3/8″
1″Shop1/4-20 UNC1-3/8″3-1/2″2-3/8″1-5/8″
1″Shop3/8-16 UNC1-3/8″3-9/16″2-3/8″1-3/4″
1-1/4″Shop3/8-16 UNC1-3/4″3-3/4″2-1/2″2-1/8″
1-1/2″Shop3/8-16 UNC2″4″2-1/2″2-3/8″
2″Shop3/8-16 UNC2-7/16″4-9/16″2-1/2″2-13/16″
2″—1/2-13 UNC2-7/16″4-5/8″2-1/2″2-15/16″
2-1/2″—1/2-13 UNC3″5-3/16″3″3-1/2″
3″Shop1/2-13 UNC3-5/8″5-3/4″3″4-1/8″
3-1/2″—1/2-13 UNC4″6-3/8″3″4-1/2″
4″Shop1/2-13 UNC4-5/8″6-3/4″3″5-1/8″
5″Shop1/2-13 UNC5-5/8″8″3″6-1/8″
6″Shop5/8-11 UNC6-3/4″9-7/16″3-3/4″7-3/8″
8″Shop5/8-11 UNC8-3/4″11-7/16″3-3/4″9-3/8″
10″Shop3/4-10 UNC10-7/8″13-3/4″4″11-5/8″
12″Shop7/8-9 UNC12-7/8″16″4-1/2″13-3/4″
14″Shop7/8-9 UNC14-1/4″17-1/4″4-1/2″15-1/8″
16″Shop7/8-9 UNC16-1/4″19-1/4″4-1/2″17-1/8″
18″Shop1-8 UNC18-1/4″21-5/8″5″19-1/4″
20″Shop1-8 UNC20-1/4″23-5/8″5″21-1/4″
22″—1-8 UNC22-1/4″25-5/8″5″23-1/4″
24″Shop1-8 UNC24-1/4″27-5/8″5″25-1/4″
30″—1-8 UNC30-1/4″35″5″31-1/4″
36″—1-8 UNC36-1/4″40-1/4″5″37-1/4″
No standard pad fits 2″ pipe on 1/2″ rod (legs 2-15/16″ apart) and 3-1/2″ pipe on 1/2″ rod (legs 4-1/2″ apart). Need a pad for one of these? Call either store.
Pads
Pipe sizeWe carryRodLengthHole C-CWidthHeight
1/2″—1/4″2-1/2″1-3/16″1″7/16″
3/4″Shop1/4″3″1-3/8″1″7/16″
1″Shop1/4″3″1-5/8″1″7/16″
1″—3/8″3″1-3/4″1″7/16″
1-1/4″—3/8″3-1/2″2-1/8″1″7/16″
1-1/2″—3/8″4″2-3/8″1″7/16″
2″Shop3/8″4-1/2″2-13/16″1″7/16″
2-1/2″—1/2″5″3-1/2″1″7/16″
3″Shop1/2″6″4-1/8″1″7/16″
4″Shop1/2″7″5-1/8″1″7/16″
5″Shop1/2″8″6-1/8″1″7/16″
6″Shop5/8″9″7-3/8″1″7/16″
8″Shop5/8″11″9-3/8″1″7/16″
10″Shop3/4″13-1/2″11-5/8″1-1/2″11/16″
12″Shop7/8″16″13-3/4″1-1/2″11/16″
14″Shop7/8″17″15-1/8″1-1/2″11/16″
16″Shop7/8″19″17-1/8″1-1/2″11/16″
18″Shop1″21-1/2″19-1/4″1-1/2″11/16″
20″Shop1″23-1/2″21-1/4″1-1/2″11/16″
22″—1″25-1/2″23-1/4″1-1/2″11/16″
24″—1″27-1/2″25-1/4″1-1/2″11/16″
26″—1″29-1/2″27-1/4″1-1/2″11/16″
30″—1″33-1/2″31-1/4″1-1/2″11/16″
36″—1″39-1/2″37-1/4″1-1/2″11/16″
42″—1″45-1/2″43-1/4″1-1/2″11/16″
Width and height are the pad’s cross-section (see the end view). Pads go one per U-bolt.

Reading the chart

Start with the pipe, then the rod. Most pipe sizes have one U-bolt and one pad. Where a size comes in two rods (1″ and 2″), match the rod too — the legs sit farther apart on the thicker rod.

The insulated U-bolts linked here come with their pad and 4 nuts. Pads are also sold on their own as spares. Each U-bolt’s page shows the pad that fits it, and each pad’s page shows the U-bolts that fit the pad.

Not sure of the size you have? See How to Measure a U-Bolt. A size or pad that isn’t listed? Call either store — we’ll find it.

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