HOW TO DETERMINE PROPER SIZE
Video Instructions:
Watch this instructional video on the Clampco YouTube Channel.
METHOD ONE
Three ways to measure
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.
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
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
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).
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 )
OUTSIDE FLANGE DIAMETER
2-step process to measure
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).
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
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).
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
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
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 ]
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
sales@clampco.com
330.336.8857
Use the Online Store to order small orders of standard stock items. For quantities of 25 or more, or for custom orders, please submit a RFQ.
www.trucknbusclamps.com
Questions? Call 330.336.8857.