Hose Clamp Size Chart: Choosing the Right Clamp
A hose clamp size chart matches each clamp to the hose it fits, and this guide shows how to measure a hose and pick the right size from the kits below.
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A radiator hose weeps at the clamp after a coolant change, and the clamp in the parts bin is either too small to close or too big to bite. A hose clamp size chart answers the question before the next trip to the store: it matches each clamp size to the hose it fits, so the clamp you grab is the one that closes tight. This guide shows how to measure a hose, read the chart, and pick the right kit.
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Below: the size chart for the kits in this guide, how to measure a hose, and a checklist to run before the first clamp.
Seamaka Hose Clamp Assortment 222PCS 304 Stainless
A 222 piece kit of 304 stainless steel worm gear clamps in 10 sizes from 1/4 in to 2-3/4 in (6-70 mm), with a socket wrench and a screwdriver.
Pros
- 10 sizes from 1/4 in to 2-3/4 in
- Per-size counts stated
- 0.023 in bands, smooth edges
- Socket wrench and screwdriver
Cons
- Title counts 222 pieces, bullets count 220 clamps
- Largest size has only 2 pieces
- No warranty term is stated
- The largest sizes list no mm range
Dianrui 222 PCS Hose Clamp Assortment
A 222 piece kit of 304 stainless steel worm gear clamps in 10 sizes from 1/4 in to 2-3/4 in (6-70 mm), with a screwdriver and a spanner in a hand carry box.
Pros
- 10 sizes from 1/4 in to 2-3/4 in
- Size marked on each clamp
- Screwdriver and spanner included
- Hand carry box holds other tools
Cons
- Bullets say 1 screwdriver, then two
- No band thickness is stated
- No warranty term is stated
- No nut driver included
DREXON 200PCS Stainless Steel Hose Clamp
A 200 piece kit of 304 stainless steel worm gear clamps in 8 sizes from 1/4 in to 2 in (6-51 mm), with 2 nut drivers and a toolbox with size labels.
Pros
- 0.026 in bands, the thickest stated here
- 2 nut drivers, 1/4 in and 9/32 in hex
- Toolbox with size labels
- 8 sizes for fuel and radiator hoses
Cons
- Only 8 sizes, tops out at 2 in
- No weight stated
- No warranty term is stated
- No per-size counts stated
Prragvss 70PCS Hose Clamp Assortment Kit
A 70 piece kit of 304 stainless steel worm gear clamps in 6 sizes from 1/4 in to 1 1/2 in (6-38 mm), in a transparent storage box with size labels.
Pros
- Transparent box with size labels
- Lowest stated weight at 1.19 pounds
- Smooth bands to prevent hose damage
- Corrosion-resistant, rust-proof, salt-resistant
Cons
- Only 6 sizes, tops out at 1 1/2 in
- 70 pieces, the fewest here
- No warranty term is stated
- No band thickness is stated
Hose clamp size chart: the sizes in these kits
A hose clamp size is the range of hose diameters the clamp fits, in inches and millimeters. Measure the hose and find the range that covers it.
| Clamp size | Fits hose |
|---|---|
| 1/4-1/2 in | 6-12 mm |
| 3/8-5/8 in | 10-16 mm |
| 1/2-3/4 in | 13-19 mm |
| 5/8-1 in | 16-25 mm |
| 3/4-1-1/8 in | 19-29 mm |
| 3/4-1-1/4 in | 18-32 mm |
| 13/16-1-1/2 in | 21-38 mm |
| 1-2 in | 27-51 mm |
| 1-3/8-2-1/4 in | 40-63 mm |
| 1-3/4-2-3/4 in | 46-70 mm |
The ranges overlap, so pick the size whose range covers the hose with room to tighten. The 8-size kit tops out at 2 in and the 6-size kit at 1 1/2 in.
How to measure a hose for a clamp
Measure the outside diameter of the hose where the clamp will sit; a tape measure or calipers both work. Match the measurement to the chart above, and pick the clamp size whose range covers it.
- Measure the hose. Measure the outside diameter where the clamp will sit.
- Find the range. Look up the measurement in the chart above.
- Check the fit. Slip the clamp over the hose before tightening, and make sure it closes with room to spare.
A clamp sized to the fitting may not close on the hose. Measure the hose itself, and check the size marked on the clamp before you tighten it.
Use rated jack stands on solid ground, wear eye protection with power and air tools, keep fuel-burning equipment out of a closed garage, and follow the manual for every tool. Read our Safety Disclaimer.
Hose clamp kits for the job
Once the hose size is known, the kit with that size in the box is the one to reach for.
| Product | Shop Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| Seamaka 222 Pc Kit | 9.6 | 30 | 21 | 21 | n/a | 0 |
| Dianrui 222 Pc Kit | 9.6 | 30 | 20 | 21 | n/a | 0 |
| DREXON 200 Pc Kit | 9.6 | 29 | 22 | 20 | n/a | 0 |
| Prragvss 70 Pc Kit | 9.5 | 27 | 20 | 19 | n/a | 0 |
Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score. Safety counts only for powered gear or where the listing states safety features; where it does not apply, the score is taken over the remaining 90 points.
For the full shop equipment range, see the engine and shop equipment hub.
Checklist before the first clamp
- Measure every hose. Hoses on the same job can differ in size, so measure each one.
- Check the size on the clamp. The Dianrui kit marks the size on each clamp, so check the mark before you fit it.
- Pick the right driver. The DREXON listing states nut drivers tighten worm gear clamps faster than flat-head screwdrivers, and the kit includes 2 nut drivers.
- Keep the box labeled. The DREXON toolbox and the Prragvss box carry size labels.
- Check for rust. All 4 kits use 304 stainless steel, which the listings say resists rust and corrosion, but check a clamp before you fit it.
FAQ: garage tools
How do I measure a hose for a clamp?
Measure the outside diameter of the hose where the clamp will sit, then match it to the chart above and pick the clamp size whose range covers it.
What does the size on a hose clamp mean?
It is the range of hose diameters the clamp fits. A clamp marked 1/2-3/4 in fits hoses from 1/2 in to 3/4 in across, or 13-19 mm.
How many clamps come in a kit?
The Dianrui and Seamaka kits hold 220 clamps each, the DREXON kit holds 200, and the Prragvss kit holds 70.
Can I use these clamps on a radiator hose?
Yes, per the listings. The DREXON kit lists radiator hoses, fuel lines and coolant hoses, the Dianrui and Seamaka kits list automotive, plumbing and fuel line work, and the Prragvss kit lists automotive, industrial and household plumbing use.
What are the clamps made of?
All 4 kits use 304 stainless steel. The listings state the clamps are corrosion-resistant and rust proof, and the Prragvss listing adds salt-resistant. The DREXON bands are 0.026 inches thick, and the Seamaka bands are 0.023 inches thick.
Related: the engine and shop equipment hub, our best oil drain pan picks and the garage upgrades hub.
