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SAE J1193-2001: Nomenclature and Dimensions for Hydraulic Excavators
The SAE J1193-2001 recommended practice provides a uniform method for specifying dimensional data and nomenclature of mobile hydraulic excavators. Though canceled, it remains a foundational reference for machine sizing, functional range definitions, and industry communication. 🛠️
Scope and Purpose
This standard applies to hydraulic excavators as defined in SAE J1057. Its purpose is to establish a consistent approach for providing dimensional specifications and naming conventions for the major components of mobile hydraulic excavators. It covers both single-letter dimensions (to define overall machine size) and double-letter dimensions (to define functional range like digging depth and reach).
Dimensional Specifications
Single-Letter Dimensions – Machine Size
Single-letter dimensions are used primarily to describe the physical size of the excavator. They are applied to Figures 1 through 3 of the standard. The table below lists selected key dimensions and their descriptions.
| Dimension | Description |
|---|---|
| A | Overall length |
| B | Overall height |
| C1 | Width of upper structure |
| C2 | Width of upper structure with catwalks |
| D | Minimum clearance, upper structure to undercarriage |
| E | Swing clearance, rear of upper structure |
| F | Top of cab to groundline |
| G | Clearance, upper structure to groundline (outriggers retracted) |
| H | Top of wheel mounted undercarriage frame to groundline |
| N | Ground clearance (per SAE J1234) |
| R | Wheelbase (for tandem axles measured to tandem pivot point) |
Double-Letter Dimensions – Functional Range
Double-letter dimensions are used to define the working range of the excavator, such as digging, reaching, and dumping capabilities. They apply to Figures 4 through 7 for common hydraulic excavator types. Examples include:
- AC — Maximum digging depth
- AE — Radius at maximum digging depth
- AF — Maximum depth of vertical wall that can be excavated
- AH — Minimum radius at groundline
- AM — Boom length (boom pivot to arm pivot)
- AN — Arm length (arm pivot to bucket pivot)
- BB — Maximum height of working equipment
- BC — Maximum bucket tooth height
🔍 Reference Note: For dimensions related to turning radius and off-tracking of rubber-tired machines, refer to SAE J695. All dimensions are based on the machine sitting on a firm, level groundline. Rubber tires must be on manufacturer-specified tires inflated to specified pressure; crawler track shoes must not penetrate the groundline.
Engineering Design Insights
Key points to consider when interpreting or applying SAE J1193:
- Groundline reference: All dimensions reference a firm, level groundline. Tire pressures and track shoe penetration must be controlled to obtain consistent measurements.
- Illustrations: The drawings in the standard are not intended to represent any specific existing machine but only to clarify the meaning of terms and dimensions.
- Single- vs. double-letter dimensions: Do not confuse these two groups — single letters define machine size (Figures 1-3), double letters define functional range (Figures 4-7).
- Related standards: Always refer to SAE J695 (turning ability), SAE J1057 (identification terminology), and SAE J1234 (specification definitions) for complete specification requirements.
⚠️ Cancellation Notice: SAE J1193-2001 was canceled in 2001 and is no longer maintained. For new equipment designs, use current applicable standards. This information is provided for historical reference and legacy support.
Frequently Asked Questions
What is the purpose of SAE J1193?
It establishes uniform nomenclature and dimensional specifications for hydraulic excavators, enabling consistent communication between manufacturers, specifiers, and users.
How are groundline conditions defined in the standard?
All dimensions are measured from a firm, level groundline. For rubber-tired machines, tires must be manufacturer-specified and inflated to the prescribed pressure. For crawler machines, the track shoes must not penetrate the groundline.
What is the difference between single-letter and double-letter dimensions?
Single-letter dimensions (e.g., A, B, C1) describe overall machine size and are used in Figures 1-3. Double-letter dimensions (e.g., AC, AE, BB) describe the functional working range and are shown in Figures 4-7.
Has SAE J1193 been superseded?
Yes, the standard was canceled in 2001. It is not active but remains useful as a reference for existing equipment and historical understanding. Always verify with the latest SAE standards for current practice.
