Axle Ordering Information

Ordering Information

We provided this information to make your job of selecting Quality Running Gears easier.

If you have any questions or need further assistance call one of our trained sales people

at any one of our convenient locations. When selecting an axle you will need to consider the following factors:

GROSS AXLE WEIGHT RATING

Gross Axle Weight Rating (GAWR) is a rating of the maximum weight allowed

to be placed on the running rear assembly and is based on the combined

Individual capacities of all the running gear components.

That is, the maximum capacity of the axles, suspension, tires and wheels. Keep in mind the GAWR can only be rated as high as the weakest of the running gear components.

Example : A GAWR of 5,920 lbs. is based on an axle capacity of 7,000 lbs. (3,500 x 2 ea.),

a spring capacity of 7,000 lbs. (1,750 x 4 ea.), a wheel capacity of 7,280 lbs. (1,820 x 4 ea.)

and a tire capacity of 5,920 lbs. (1,480 x 4 ea.).

GROSS VEHICLE WEIGHT RATING

Gross Vehicle Weight Rating (GVWR) is a rating of the maximum Gross Vehicle Weight (GVW)

that a trailer should legitimately weigh when fully loaded. GVWR is determined by a combination of the GAWR, coupler capacity and the frame design capacity. To figure the GVWR add 10% of the coupler capacity (25% for goosenecks) to the GAWR. Now, compare the resulting figure with the frame design

capacity. The lower of the two figures would be your GVWR.

Example 1 : A trailer with a GAWR of 5,920 lbs., a coupler rating of 7,000 lbs. and a frame design capacity of 7,000 lbs. could have a GVWR rating of 6,620 lbs.

Example 2 : A trailer with a GAWR of

5,920 lbs., a coupler rating of 7,000 lbs. and a frame design capacity of 6,500 lbs. could have a GVWR rating of 6,500 lbs.

NUMBER OF AXLES

Based on GAWR determine whether you want a single, tandem, or a triple axle setup. Use this information to determine axle capacity requirements.

Types: Single Axle, Tandem Axle, or Triple Axle.

AXLE TYPE

Decide on what type you will be using, tubular or torsion. Tubular axles are available in multiple material dimensions and require additional suspension components. "Equalizer" torsion axles have the suspension built into the axle.

Types: Axle Tube, Tubular Axle, Torsion Tube, Torsion Axle

SPINDLE CONFIGURATION

Trailer ride heights are affected by the spindle configuration. Tubular axles are available with straight or drop spindles."Equalizer" torsion axles use specific start angles on the trailing arms.

Types: Straight Spindle, Drop Spindle, Trailing Arm

BOLT PATTERN

The bolt pattern depends on the capacity of the axle. Yet the bolt pattern does not identify the axle capacity. It is however a factor. Multiple bolt pattern configurations are available for each axle group. Be aware that the tire and wheel capacity should match the axle capacity.

Types: 5 Bolt, 6 Bolt, 8 Bolt

BRAKES

Axles are available in both idler and braking configurations.

Determine braking requirements based upon the number ofaxles, GVW and

 the applicable State and Federal laws. There are many options in the area of brakes; electric, hydraulic uniservo, hydraulic duoservo, hydraulic freebacking, hydraulic disc or air.

Note: If you have questions regarding braking

requirements, contact the Department of Transportation or local authorities.

Types: Electric,  Hydraulic Drum, Hydraulic Disc

LUBRICATION

Standard lubrication for 2,000 to 7,000 lb. axles is grease. The "Accu-Lube"

option and bearing protectors are available onmost, as well as an oil bath option on some. 8,000 through 25,000 lb. axles are standard with 90-weight

oil bath lube.

Types: Accu-Lube Spindle Assembly, Bearing Protector

OTHER OPTIONS

Some other areas that might need consideration may be the axle tube or hub finish. Black paint is the standard finish with Galvanized tube, Hot Dip Galvanizing and Zinc plating are also available. V-Bend, camber and internally wired axle tube

 are a few of the popular options listed in the following reference chart.

Types: Zinc Plated Hub, Galvanized, V-Bend

AXLE HUB FACE – Important

This is the industry standard for measuring axle length. It is taken from the flat surface on the hub, where the studs exit the casting, to the same surface on the opposite side of the axle.

Caution! This is not to be confused with "Track" which is measured from center of tire to center of tire.

AXLE ATTACHMENT CONFIGURATION

On tubular axles this is referred to as "Spring Center." It is the measurement from the center of the spring pad  to the center of the spring pad on the opposite side of the axle. The pads can be mounted on the top or bottom of the axle tube. On "Equalizer" torsion axles this is referred to as "Outside of Bracket." It is measured from the outside of the bracket to the outside of the

bracket on the opposite side of the axle. The brackets can be specified for top mount or side mount and are available in standard or high mount versions

Types: Tubular Axle, Torsion Axle