The "German Type Pipe Wrench" in 7" and 9" sizes refers to a specific design of adjustable pipe wrench that is commonly manufactured to be a compact, robust, and often self-clamping tool, typically used for smaller-diameter pipes and fittings.1
7" and 9" Specifications
Feature7-inch Wrench9-inch WrenchMetric LengthApprox. 175 mmApprox. 225 mmApproximate Max. Capacity30 - 34 mm45 - 49 mmTypical UseHydraulic and plumbing maintenance, working in tight spaces, smaller fittings.Standard residential plumbing and general tightening/loosening.MaterialDrop-forged Carbon Steel, or Chrome Vanadium Steel (for high-quality versions).Drop-forged Carbon Steel, or Chrome Vanadium Steel.FinishOften powder-coated (e.g., black or blue) with bright/polished, hardened jaws.Often powder-coated (e.g., black or blue) with bright/polished, hardened jaws.
Note: Capacity can vary slightly by manufacturer.
Common "German Type" Styles (DIN ISO 5234)
When looking for a high-quality, professional German-style wrench, the design will adhere to DIN (German Institute for Standardization) standards. The two most common and highly-regarded types are:
Straight Pipe Wrench (Form A):
The head is generally straight or angled at $90^circ$ relative to the handle, similar to a traditional American-style pipe wrench but often slimmer and with a more precise, self-clamping mechanism.
This is the standard general-purpose design.
S-Type Corner Pipe Wrench (Form C):
This is arguably the most recognizable "German style" in professional use.
It features S-shaped jaws that angle the gripping points and provide a three-point grip.2
Advantage: Provides an extremely secure, self-clamping hold on round pipes, even with light pressure. This is highly valued in industrial and professional plumbing.
The head is often angled at 3$45^circ$ for better access into corners and confined spaces.4
For 7" and 9" wrenches, the S-Type is often preferred by plumbers due to its superior grip on smaller pipes, which can be difficult to access and hold securely.
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