01 July 1997
Table 3-2a. Instruction for Use of Hammer Tables.
The tables that follow are a summary of the impact and vibratory hammer that are presently manufactured
and distributed in the United States. The table is intended to be a first reference to give an idea of what
hammers are available.
There are two tables; table 3-2b is in metric units, and table 3-2c is in English units. Both tables cover the
same set of hammers. Each table in turn is divided into two parts; impact hammers and vibratory hammers.
All of the impact hammers are sorted according to maximum rated striking energy and the vibratory hammers
according to maximum dynamic force. In both cases, with both types of hammers, it is possible to reduce the
output of the hammer from its maximum by reducing the stroke and/or fluid pressure (with impact hammers)
or by reducing the rotational speed of the eccentrics (with vibratory hammers.) This is important when a
smaller hammer for the job is required but not available.
Impact hammers have a wide variety of types and operating principles, most of which are discussed in this
chapter. In the table under "Description" there are codes listed for each hammer which categorize the
hammer\; these are as follows:
Air Only Hammer
Assisted Fall, Hydraulic Impact Hammer
Closed-end, Double-acting Diesel Hammer
Compound Hammer (this is a hammer where the air or steam is used expansively to help
move the ram on the downstroke)
Differential Acting Hammer
Free Fall, Single-acting, Hydraulic Impact Hammer
Hydraulic Impact Hammer
Open-end, Single-acting Diesel Hammer
Steam Only Hammer
The data given in these charts were compiled by Pile Buck, Inc., Jupiter, FL, from their publication "Pile
Hammer Specifications", and is reproduced by permission. It is essential for the user of this chart to know that
the data shown are compiled from manufacturers' own data. Definitions of several of the parameters vary
from one manufacturer to the next. So direct comparison of the parameters (and thus the hammers) may be
difficult. Also, new models are constantly being introduced and existing models are being updated. These
specifications may be subject to change without notice. When considering the use of a particular hammer for
an application, it is important to obtain the latest information concerning it from both the manufacturer and any
other available source. This chart thus should only be used as a preliminary guide to the most important
specifications of the hammers shown.