Plumber's Nightmare - Part IV
Hanging Hose
Article and photos by Wayne Scraba

Buying the right parts is one thing, but putting it all together is another. There are a number of ways to fasten hose (fuel lines, cooler lines and so on). Some are acceptable while others obviously aren’t.

One of the accepted methods of securing components is with a "cushioned" clamp. Now, cushioned clamps are one solution, but you have to remember that there is more than one variety of clamp. What really is a cushioned line support clamp? In simple terms, it's a clamp that is used to support metal tubing, hose or electrical harnesses. The cushion provides protection to the item being supported by firmly holding the item and preventing or "cushioning" the effects of vibration and abrasion.

There are a considerable number of Adel-style cushion clamps available. All sorts of different sizes are readily available along with an equally large number of cushion and strap materials. The text offers a chart that explains the types of clamps you can purchase.

When dealing with cushion clamps, you'll usually recognize the name "Adel" clamps. The "Adel" clamp is also referred to as a MS21919 aircraft clamp. Adel Fasteners was established in 1938 in Burbank, California. Since then Adel has become an established industry leader in aerospace clamp and elastomer development.

To be quite honest, Adel likely manufactured a large portion of the MS21919 clamps in existence; however there have been other companies, which, over the years, have manufactured them. Nonetheless, the term "Adel clamp" stuck, and it's used interchangeably with all similar varieties of cushion clamps, even if they aren't manufactured by Adel Fasteners.


a d v e r t i s e m e n t

Click to visit our sponsor's website


The MS21919 clamp is technically called a loop clamp. There are other varieties, but this versatile clamp is the most common in aerospace applications. Common sizes typically range from 1/16-inch to 4-inches in size. When you look at a typical cushion clamp part number, you'll often find a series of suffixes that follow the "MS21919".

These particular Adel cushion clamps are sized 8 and 10. That means that the smaller of the two is engineered to accept a 1/2-inch diameter hose, hardline or wiring bundle. The number 10 size is designed to accept a 5/8-inch diameter object. Both of these clamps are "DG" coded. That means they have an aluminum band or strap. The DG also signifies the cushion material, explained below.

Typically, the first will be a "W". That stands for "Wedge". The idea here is that the design of the cushion is such that it prevents something like a small wire in a bundle from being squeezed out during the clamping process. Clamps with sizes below 50 are designed with the wedge feature (more on sizing later).

The characters that follow the "W" are also important. The following is a breakdown of clamp suffix codes (these are the two characters that follow the "W"):

• CE Corrosion Resistant Steel Band, Ethylene Propylene Cushion (275° F)
• CF Corrosion Resistant Steel Band, Nitrile Propylene Cushion (200° F)
• CG Corrosion Resistant Steel Band, Chloroprene Cushion (212° F)
• CH Corrosion Resistant Steel Band, Silicone Cushion (400° F)
• CJ Corrosion Resistant Steel Band, Fluorosilicone Cushion (450° F)
• DE Aluminum Band, Ethylene Propylene Cushion (212° F)
• DF Aluminum Band, Nitrile Cushion (212° F)
• DG Aluminum Band, Chloroprene Cushion (212° F)
• F Low Carbon Steel Band, Nitrile Cushion (212° F)
• G Low Carbon Steel Band, Chloroprene Cushion (212° F)
• H Low Carbon Steel Band, Silicon Cushion (400° F)

While there are considerable choices in cushion configurations, the most common you'll find is the "wedge" arrangement shown here. In practice, this configuration is designed so that it can grasp a wire bundle, without allowing single small gauge wires to escape. Additionally, the cushion material can be varied for the application. The clamp cushion shown here incorporates a black color coded Chloroprene cushion. This is a general purpose clamp that can be used in areas that may be contaminated with petroleum-based hydraulic fluids and fuel spills. The material has excellent ozone resistant characteristics, but is not resistant to phosphate-ester based fluids. More information on cushion and strap materials is included in the text.
As you can see, the clamps are available in several different base materials as well as several different cushion materials. The most popular materials for the clamp are aluminum and stainless steel (300 series stainless steel as well as 17-7PH). Cushion clamps are also available manufactured with exotic metals such as Inconel and other elements. Cushion designs include "flat with wedge", as described above, along with a "saw tooth" configuration, an "electrical" style and others.

The most common cushion you'll find is the wedge design. The type of cushion material is determined by the environment that the clamp will find itself in. When searching for clamps, you'll often find that clamps with an "F", "G" or "H" suffix (those with low carbon steel bands) are difficult to locate. Why? Simple - they are not recommended for use on a new aircraft design and because of that, have been discontinued for almost twenty years. In other words, don't use them on your car, even if you find a killer deal on a case lot at the local swap meet.

Single place Made For You clamps are obviously designed to hold one piece of wire, harness, tubing or hose in place. As far as the single place clamps are concerned, they range in bore size from 3/16" all the way up to 13/16", in 1/16" increments.

The actual operating temperature of the clamp is determined by the clamp strap and cushion material. Temperatures from -65 degrees Fahrenheit to +450 degrees Fahrenheit can be achieved depending primarily on cushion material selection. If you refer to the above chart, you can see which materials live under specific temperature ranges.

In order to recognize the clamps, a series of color codes is incorporated. The following is an alphabetical breakdown of the specific cushion color codes along with pertinent cushion information:

• Black (sometimes with blue identity patch): The clamp is manufactured with a Chloroprene cushion. This is a general purpose clamp that can be used in areas that may be contaminated with petroleum-based hydraulic fluids as well as fuel spills. The material has excellent ozone resistant characteristics, but is not resistant to phosphate-ester based fluids. Do not use on titanium tubing.

• Blue: Fluorosilicone is the material used for the cushion in this clamp. It is ideal for use in an elevated temperature application where petroleum based fluid contamination may be a factor. The material is unaffected by ozone, however it is not resistant to phosphate-ester based fluids.

• Purple: The clamp cushion material is Ethylene Propylene. It is designed for use where contamination by phosphate-ester hydraulic fluid and other synthetic fluids is possible. The material has excellent ozone resistance, but it is not resistant to petroleum based fluids.

• Red: This is a Silicone-based clamp cushion, and was only used on clamps manufactured from low carbon steel. It is now obsolete.


a d v e r t i s e m e n t

Click to visit our sponsor's website


• White (natural): Silicone is used as the cushion material. It is engineered for use in elevated temperature applications where phosphate-ester based fluid and other synthetic fluid may present contamination. This cushion material is not resistant to petroleum based fluids, but it is unaffected by ozone.

• Yellow (solid): The cushion material is Nitrile. It is primarily used in applications where it is immersed in fuel or comes in contact with fuel vapors. It has good ozone resistance characteristics, but it is not resistant to phosphate-ester based fluids. In addition, it should not be used on titanium tubing.

The final groups of characters you will find on an Adel clamp are numbers that are used to describe the internal diameter of a closed clamp, in increments of 1/16-inch. As an example, clamp number MS21219WDG10 (as shown in the accompany photos) incorporates an aluminum strap inside a black chloroprene cushion and is sized to support a 10/16 or 5/8-inch diameter piece of tube or a wire bundle. Operating temperature is not to exceed 212-degrees F.

Double place Made For You clamps are designed to hold two hoses or lines in place. Each of the bore sizes can be identical, or they can be ordered in varying sizes. This means that one of the bores in the double clamp can be 15/16" while the other can be 1-1/16". There are fifteen different varieties of double clamps available.

Another solution is the line of clamps manufactured by Made For You Products. We've mentioned these before, but let's review the specifics: These clamps are precision molded from a non-conductive 6-6 Dupont Zytel aircraft nylon, however they have no cushion support provision. The Dupont nylon used in the manufacture of the clamp is a space age material that refuses to melt, distort, fade, stain or discolor under normal use. The Zytel material is not affected by brake fluid, coolant, fuel, solvents heat or cold. It's so good, that clamps manufactured by Made For You Products are used in many high stress automotive applications, including Winston Cup cars.

Made For Your offers a wide range of clamps in both single place and double place configurations. Single place clamps are obviously designed to hold one piece of wire, tubing or hose in place. Double place clamps (as you might expect) are designed to hold two hoses, hard lines or wire bundles in place.

Made For You clamps are precision molded from a non-conductive 6-6 Dupont Zytel aircraft nylon. This nylon is a space age material that refuses to melt, distort, fade, stain or discolor under normal use. The Zytel material is not affected by brake fluid, coolant, fuel, solvents heat or cold.

As far as the single place clamps are concerned, they range in bore size from 3/16" all the way up to 13/16", in 1/16" increments. Double place clamps are another story. Each of the bore sizes can be identical, or they can be ordered in varying sizes. This means that one of the bores in the double clamp can be 15/16" while the other can be 1-1/16". Made For You offers fifteen different varieties of double clamps. You get the picture.

An interesting feature of the Made For You clamps is the system of retention. Basically, the clamps are two-piece affairs, split down the middle with indexing pins at the base to register the two halves when joined together. In order to mount the clamp, Made For You includes a 10/32 stainless steel Phillips head fastener with each clamp. Your choice here is to either tap a chassis member or use a nut on the backside (on, for example a tab affixed to the chassis). In either case, the Phillips head of the fastener is actually countersunk into the base of the clamp.

The clamps are designed as two-piece units, split down the middle with indexing pins at the base to register the two halves when joined together. To mount the clamp, Made For You includes a 10/32 stainless steel Phillips head fastener with each clamp. Your choice here is to either tap the member or use a nut on the backside. In either case, the Phillips head of the fastener is actually countersunk into the base of the clamp.

If you're really not sure how many clamps you need, or if you like the thought of having a few extra clamps in your personal inventory, Made For You packages clamps in several different kits. One is geared toward brake line retention, another is designed for hoses (called the "Racing Kit") and another is designed for clamping wiring harnesses. Each kit includes an assortment of appropriate clamps and stainless steel fasteners.

Color choices are also another no-cost option from the folks from Made For You. Clamps are available in Black, Blue, Red, Yellow, Gray and Purple. While colored clamps won't make your car any faster or more reliable, they certainly don't hurt in the detailing department.

If you haven't gathered by now, your choices when clamping something in your car are rather large. If you have a plumbing nightmare on your hands, take a close look at these clamps (Adel and Made for You). With the prices quoted for either style of clamp I guarantee you won't get hosed.

 

 

Home
Chat
Message Board
Galleries


News  
Dirt  
New Products  


Editorial
- Bobby Bennett, Jr.
Pretty Fly
- Roger Richards
By George
- George Klass
 
Totally Bazemore


INTERVIEW - Talking with Mike "Zippy" Neff
SPORTSMAN - The wild world of Monty Bogan, Jr.
BOOK REVIEW - The King of Speed - Kenny Bernstein
What a Long Strange Trip It Has Been...
Tires: It's Getting Worse
TECH - Edelbrock: Pumping Power
TECH - Plumbing Your Race Car, Part 4


Our favorite stories from the past...

In the Beginning: Vol 1, Iss 1
Best of War Stories
Gary Scelzi Fired Up
Pro Stock Truck Association vs NHRA
Remembering Steve Grebeck
Greg Anderson's Beadlock Tirade
IHRA vs AMS vs Disgruntled Pro Mod Racers
The Impact of Racing Fathers on Their Children
Cheating 101
Team Mopar Turmoil and the Nickens Dismissal
Birth of a Rebel - the Larry Carrier Story
Pounds Per Cubic Inch
Remembering OCIR
The Legend of Lions Dragway
Your Cheatin' Heart - Angelle vs Matt
The Day Glidden Almost Went Olds
Some of our Favorite Quotes
Editorial Bliss - Some of our favorite commentaries


Orlando World Street Nationals
Orlando Photo Gallery
DRAGSTOCK
DRAGSTOCK Photo Gallery
BIG DOG - Greensboro, NC
IHRA - Norwalk
IHRA - Norwalk Photos
NHRA - Reading
NHRA - Reading Photos
NHRA - Chicago II

NHRA - CHRR - Bakersfield
NHRA - Dallas
NHRA Dallas - Photos
NHRA AMS - Dallas
NHRA AMS - Dallas Photos
IHRA - Budds Creek
IHRA - Budds Creek Photos
IHRA - Epping
IHRA - Epping Photos
NHRA - 50th US Nationals
US Nationals Photos
AMS Pro Mods - Indy
AMS Pro Mods - Indy Photos
IHRA - Norwalk
IHRA - Norwalk Photos
NSCA - Stanton
NSCA - Stanton Photos


Feedback
About CompetitionPlus
Back Issues Archive
Advertising

 


© Competitionplus 2004