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Steel convex jointer with 10 inch blade, 5/8 by 3/4 inch notch

KRAFT TOOL

KRAFT TOOL RO5121-5/8X3/4 Convex Jointer hand tool

SKU CH-ZWJ3-AA8Z7 MPN RO5121-5/8X3/4

Convex steel jointer shapes 10-inch masonry joints with 5/8 and 3/4 inch widths

  • Product typeMasonry Tools
  • Convex blade creates smooth masonry joints
  • 10-inch steel blade resists wear on job sites
  • Dual 5/8 and 3/4-inch widths suit common mortar joints
  • Kraft Tool masonry design built for professional use
  • One-piece steel construction eliminates handle loosening

KRAFT TOOL Convex Jointer

The KRAFT TOOL RO5121-5/8X3/4 is a convex jointer designed for masonry finishing work. It shapes mortar joints between bricks or blocks to create a smooth, rounded profile that sheds water effectively. This hand tool is intended for professional masons and serious DIY builders who need consistent joint profiles on site. Its steel construction withstands the abrasion of daily use on cementitious materials.

5/8 x 3/4 inch notch widths

The single specification that decides fit is the dual notch width of 5/8 inch and 3/4 inch cut into the blade. These two sizes cover the most common mortar joint thicknesses specified in residential and light commercial blockwork. If the project calls for a different joint width, this jointer will not produce the required profile and another tool must be selected.

10 inch blade length

The 10 inch steel blade provides enough length to strike long, continuous joints without frequent repositioning. It comfortably handles standard brick and block courses across a typical wall section. The tool runs out when joint widths fall outside the two preset notches or when access is too tight for the blade length, requiring a shorter or differently sized jointer.

How it compares

Measured against everything we stock in Utility & Specialty Hand Tools, at today’s prices. Recalculated every night.

Price $12.99
Cheaper than about 73% of the 2,474 comparable items (median $23.99).

Specifications

Product
Brand nameKraft Tool
Model nameRO5121-5/8 × 3/4
Product typeMasonry Tools

Questions about this item

How does the 10 inch blade length affect jointing depth on a real job?

The 10 inch blade spans a full mortar course so you can smooth long horizontal joints without repositioning the tool.

What does the convex notch shape mean for the finished mortar profile?

The convex notch presses a rounded channel into fresh mortar creating the classic curved joint profile used in brick and block work.

What mounting or handle setup does this jointer need to fit a user's grip?

The tool has no separate handle it is a single steel blade shaped for direct hand hold during jointing.

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