C.S. Osborne No. 128 Gouge: Sizes and Buying Checks
Distinguish C.S. Osborne No. 128 gouge blade sizes and profiles before ordering. No invented cutting-depth or workshop-performance claims.
Research-based buying guide: We have not independently tested this product. Specifications below are attributed to the linked manufacturer information.
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For an adjustable gouge, identify both the catalog number and the blade variant. A listing that says only “adjustable U-gouge” can omit the detail that determines the groove shape.
Manufacturer-listed variants
C.S. Osborne’s leather-tool catalog identifies No. 128 as an adjustable gouge. It lists 3/32-, 1/8- and 5/32-inch blade widths and a separate 90-degree V-shaped option. The catalog describes its use for folds. These are different selections; depth adjustment should not be confused with continuously adjustable blade width.
Match the profile to the intended fold
Specify the desired groove shape and the exact tool variant when asking a supplier for advice. A U-shaped and V-shaped groove are not interchangeable descriptions. Confirm the tool’s intended material use and instructions before choosing it for a leather project or another material.
Do not rely on the old numerical test results
The previous claims of a 1–6 mm adjustment range, 50 cuts within 0.2 mm, 30% lower effort and more than 200 cuts before dulling were not supported by documented testing. They have been removed. We have not established a safe remaining thickness or a suitable cut depth for your workpiece.
Before purchase
Check the blade width/profile, current replacement-blade availability, supplied contents and seller return terms. For an unfamiliar leather or finish, obtain application advice and evaluate a scrap piece using the tool instructions. This page does not establish woodworking suitability or provide a universal cutting procedure.
Sources and further reading
Research checked November 8, 2026. Verify the exact model and current seller terms before ordering.