QF Duct Clamp

QF Clamps are used as an easy and quick way to connect QF Pipe and other QF fittings together. Clamps come with an internal seal and a cotter pin to lock the clamp in the closed position. Clamps are made from galvanized or 304SS, and come with nitrile seals (silicone and ePTFE optional).
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Quick Fit (QF) Clamp is a quick and easy way to connect QF Pipe and other QF fittings together. The standard clamps come with a Nitrile (buna-n) seal. QF Clamps with silicone and ePTFE seals are available in applications where nitrile seals are unacceptable. QF Clamps are also supplied with a cotter pin to lock the clamp in the closed position.

QF Clamps are manufactured as follows:

  • In Galvanized or 304SS Stainless Steel with like material for the cotter pins
  • 3 to 6 inches diameters come with a small cotter pin and a 3/8 inch wide Nitrile Seal
  • 7 to 12 inches diameters come with a large cotter pin and a 1/2 inch wide Nitrile Seal
  • 12 to 24 inches diameters come with a large cotter pin and a 5/8 inch wide Nitrile Seal
Size
in.
Galvanized
ga.
304SS
ga.
Weight
lbs.
Galvanized Gauge Metal Thickness
Gauge
Inches
Millimeters
20
0.0396
1.01
18
0.0516
1.31
16
0.0635
1.61
Stainless Gauge Metal Thickness
Gauge
Inches
Millimeters
22
0.031
0.79
20
0.0375
0.95
18
0.0500
1.27
3 20 22 0.26
4 20 22 0.28
5 20 22 0.31
6 20 22 0.33
7 18 20 0.54
8 18 20 0.59
9 18 20 0.63
10 18 20 0.68
11 18 20 0.70
12 16 18 1.32
13 16 18 1.38
14 16 18 1.48
15 16 18 1.53
16 16 18 1.60
17 16 18 1.67
18 16 18 1.77
19 16 18 1.85
20 16 18 1.92
21 16 18 1.95
22 16 18 2.04
23 16 18 2.10
24 16 18 2.20
NOTES:
  1. At temperatures ranging between 390° F and 480° F, the zinc-iron alloy layers in the galvanized steel will continue to provide a high level of protection from corrosion. However, there may be some peeling, changes in mechanical properties, and reduction in the corrosion protection. Recommended maximum service temperature is 390° F.
  2. For 304 SS metal, bluing may occur at temperatures of 800° F and above.
Item Material Compliance/Rating
QF Clamp Galvanized ASTM A653 with a G-90 Rating
304 SS Finish meets ASTM 240
Gaskets Nitrile ASTM D1056 2B2
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