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HOW TO DETERMINE PROPER SIZE

HOW TO DETERMINE NOMINAL SIZE FOR YOUR HOSE CLAMP APPLICATION + -

Video Instructions:
Watch this instructional video on the Clampco YouTube Channel.  

METHOD ONE

Three ways to measure

Measuring Nominal Size for Hose Clamp Application using Calipers
Using Calipers

Use calipers to measure the outside diameter (O.D.) of the hose and fitting application with the hose assembled on the pipe or tube fitting as shown in illustration 1A. Use this measurement to specify the nominal clamp size.

Measuring Nominal Size for Hose Clamp Application using a Tape Rule
Using Tape Rule

Use a narrow tape rule to measure the circumference of the hose and fitting application with the hose assembled on the pipe or tube fitting as shown in illustration 1B. Denote this as circumference, (c).
Use the formula:
Nominal Application Diameter (ND)
ND = c ÷ 3.1416

Measuring Nominal Size for Hose Clamp Application using a 'Pi' Tape Rule
Using "Pi" Tape Rule

Use a "pi" tape rule to measure the O.D. of the hose and fitting application with the hose assembled on the pipe or tube fitting as shown in illustration 1C. Use this measurement to specify the nominal clamp size.

METHOD TWO

2-step process to measure

Measuring the O.D. with Calipers
Step 1

Use calipers to measure the O.D. of the pipe or tube fitting as shown above. This diameter may also be measured with a narrow tape rule or "pi" tape rule as shown in illustrations 1B and 1C. Denote this dimension as diameter, (d).

Measuring the material thickness with Calipers
Step 2

Use calipers to measure the material thickness of the hose as shown in illustration 1E. Denote the thickness dimension as thickness, (t).
Use the formula:
Nominal Application Diameter (ND)
ND = d + ( 2 x t )

 
HOW TO DETERMINE PROPER DIMENSIONS FOR YOUR V-BAND COUPLING APPLICATION + -
OUTSIDE FLANGE DIAMETER

2-step process to measure

Measuring the outside flange diameter with calipers
Using Calipers

Use calipers to measure the largest or "outside" diameter of your flange as shown in illustration 1A. (or use a "pi" tape rule as shown in illustration 1b.) Denote this outside flange diameter as (fd).

Measuring the outside flange diameter using a Tape Rule or Pi Tape Rule
Using Tape Rule or Pi Tape Rule

Use a narrow tape rule to determine the
flange circumference (c) as shown in 1B.
Use the formula:
Flange Diameter (FD)
FD = c ÷ 3.1416

 
FLANGE BASE DIAMETER

1-step process to measure

Measuring the Flange Base Diameter with calipers

Use calipers to measure the "base" diameter of your flange as shown in illustrations 2A and 2B. This dimension can also be measured with a narrow tape rule or with a "pi" tape rule as shown in illustration 2C. Denote this base diameter as (bd).

Measuring the Flange Base Diameter with calipers
Measuring the Flange Base Diameter using a Tape Rule or Pi Tape Rule
FLANGE HEIGHT CALCULATION

To determine the height of your flange, you can use the previously measured outside flange diameter (fd), and the flange base diameter (bd).
Use the formula:
Flange Height (FH)
FH = (fd – fb) ÷ 2

FLANGE APEX
Measuring the flange apex

This dimension is best determined by measurement with an optical comparator or from the actual design print of the flange. However, it can be measured with great care using calipers as shown in illustration 4A. Denote this flange apex as (a).


*Remember that O-rings and gaskets will change your final width dimensions.

 
FLANGE BASE WIDTH
Measuring the flange base width

This dimension is best determined by measurement with an optical comparator or from the actual design print of the flange. However, it can be measured with care using calipers as shown in illustration 5A. Denote this base width as (w).


*Remember that O-rings and gaskets will change your final width dimensions.

 
FLANGE ANGLE

This dimension is best determined by measurement with an optical comparator or from the actual design print of the flange. However, it can be determined by using the previously measured flange apex (a), flange base (w), and flange height (fh).
Use the formula:
Flange Angle = TAN¯1 [ ( w – a ) ÷ fh ]

 
THE IMPORTANCE OF CAREFUL MEASUREMENT + -
T-BOLT CLAMPS: THE IMPORTANCE OF BEING MEASURED

T-Bolt clamps from Clampco offer a wide variety of advantages:

• Higher-torqued assemblies (creating a more efficient tightening mechanism)
• Attention to detail (like smooth edges and quality materials)
• One of the strongest trunnions available (stainless is standard instead of plated steel)
• Ease of installation
• Allowance for slight variations in hose diameter and shape
• Plated steel bolts are alloy steel instead of low carbon steel

But even the very best T-Bolt clamps won't work properly, if they aren't the right size.

And a small mis-measurement of the diameter can make a big difference - usually three times the amount of the mistake. The best way to properly size for T-Bolt clamps is simple:
1. Always remember to have the hose accurately assembled the way you plan to use it.
2. Accurately measure the outside circumference of the hose assembly.
3. Divide that measurement by pi (3.1416)

Or contact us now for assistance with your next purchase of T-Bolt clamps.

Clampco Products Inc.

1743 Wall Road

Wadsworth, OH 44281

Established in 1971, Clampco Products is a family owned, USA manufacturer of high-quality stainless-steel clamps including V-Band, T-Bolt, Barrel Hardware, Worm Gear and Custom Clamps as well as Straps & Strap Assemblies.

AS9100

ISO 9001

ISO 14001

CERTIFICATIONS
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