Answering the common need for efficient mortar removal and tuck-pointing, these mortar rake bits are designed to fit angle grinders with 5/8-11 threads. They’re best for professional masons, homeowners doing repointing projects, or renovations requiring clean joints, brick, and masonry work. This guide highlights five top options, noting who each is best for and any practical limitation to consider.
| Product | Thread | Working Length | Material | Best For |
|---|---|---|---|---|
| PRODIAMANT Mortar Rake 8mm 5/16″ | 5/8-11 | 26 mm | Tungsten Carbide | Masonry joints, easy joint cleaning |
| HIGHDRIL Diamond Mortar Raking Bit 8mm | 5/8-11 | 25 mm (short) / 100 mm (long) | Old mortar prep, intricate areas | |
| SHDIATOOL Diamond Mortar Raking Bit 8mm | 5/8-11 | 25 mm and 100 mm | Brickwork joints and delicate material | |
| PRODIAMANT Mortar Rake 6mm 1/4″ | 5/8-11 | 26 mm | Tungsten Carbide | Smaller joints, quick cleanup |
| FOCSTOL Diamond Mortar Raking Bit 8mm | 5/8-11 | 130 mm total (100 mm diamond) | Large scale mortar raking and brick removal |
Notes: All products in this article use a 5/8-11 thread common to many angle grinders, enabling broad compatibility. Each entry is chosen for relevance to mortar removal, tuck pointing, or joint cleaning tasks on masonry, brick, and stone.
PRODIAMANT Mortar Rake 8mm 5/16″ Bit
- Features: FAST, CLEAN MORTAR REMOVAL; 3 TUNGSTEN CARBIDE EDGES; FULL DEPTH CLEANING with 26 mm working length.
Best for: Professional repointing on brick and masonry with quick, clean mortar removal. This is a solid, all-around choice for standard joints.
Why chosen: Balanced performance with three carbide edges improves cut control and longevity, suitable for frequent use.
Caution: Better for standard joints; extremely dense stone may slow cut rate.
HIGHDRIL Diamond Mortar Raking Bit 8mm
- Features: 1 pc 8 mm diameter, 25 mm working length; Diamond grit 45/50; vacuum brazed tech; longer life and faster removal.
Best for: Areas behind pipes or where short bits are required; the longer version supports more demanding removal tasks.
Why chosen: Diamond technology provides longer life and less vibration during stock removal compared to tungsten routers.
Caution: The 25 mm option may be too short for some joint widths; consider the longer variant for deeper cleaning tasks.
SHDIATOOL Mortar Raking Bit 8mm (2 Pack)
- Features: Two-piece set; 8 mm diameter; 25 mm and 100 mm work lengths; 5/8”-11 thread; grit 40/45; designed for delicate work and long life.
Best for: Detail-oriented mortar removal and brickwork where precision and control are important.
Why chosen: The two-length option supports both tight joints and longer removal runs, reducing tool changes.
Caution: Diamonds can wear with heavy use; monitor wear on longer jobs for consistent results.
PRODIAMANT Mortar Rake 6mm 1/4″
- Features: FAST, CLEAN MORTAR REMOVAL; 3 TUNGSTEN CARBIDE EDGES; FULL DEPTH CLEANING with 26 mm working length.
Best for: Narrow joints and compact repointing areas where a smaller cutter excels.
Why chosen: Same robust carbide design with a smaller diameter for precision work.
Caution: May be slower on very dense mortar or thick joints; consider larger diameters for bigger jobs.
PRODIAMANT Mortar Rake 10mm 3/8″
- Features: FAST, CLEAN MORTAR REMOVAL; 3 TUNGSTEN CARBIDE EDGES; FULL DEPTH CLEANING with 26 mm working length.
Best for: Medium to large joints often found in older masonry where faster removal is needed.
Why chosen: A larger diameter increases material removal rate for bigger joints while maintaining control.
Caution: Heavier tool could cause more vibration; ensure grinder is properly balanced and wear eye protection.
Buying Guide
What thread size should I choose?
All products listed use a standard 5/8-11 thread. This is common for many angle grinders. Confirm your tool’s arbor thread before buying to ensure compatibility.
Which diameter and working length suit my project?
Smaller diameters (6–8 mm) fit narrow joints and tight spaces, delivering precision. Longer work lengths (100 mm) help in behind pipes or deep joints. For larger brick mortar removal, pairing a short and long option can speed up work without frequent tool changes.
Diamond vs tungsten carbide: which is better?
Diamond bits generally offer longer life and faster cutting, especially on hard masonry or heavily reinforced joints. Tungsten carbide edges provide strong performance for standard mortar removal but may wear quicker on dense materials.
What safety considerations matter?
Use eye and hearing protection, a dust mask if debris is produced, and secure the workpiece. Maintain a steady grip and use lower speed when starting to minimize kickback. Check bit compatibility with your grinder’s maximum RPM and lock nut.
How should I choose for delicate vs heavy-duty work?
Delicate work benefits from shorter lengths and precise diameters (smaller bits with fine grit). Heavy-duty repointing or large masonry removal suits longer diamond bits with greater stock removal capacity.
Frequently Asked Questions
- Are these bits compatible with all angle grinders? They typically fit tools that accept 5/8-11 threaded bits. Check your grinder’s arbor size and lock nut compatibility.
- Can I use these for stone and tile work? Diamond mortar raking bits work on concrete, brick, and certain stone joints, but verify suitability for your stone type and joint depth.
- How long do diamond bits last compared to carbide? Diamond bits generally last longer under typical mortar removal tasks, especially in dense masonry, though wear depends on material and use.
- Is a longer bit better for all applications? Longer bits enable deeper removal and easier work behind obstacles, but they can be harder to control in tight spaces. Choose based on access and joint depth.
- Should I use water with these bits? Most mortar raking bits are designed for dry use; follow manufacturer guidance. Water cooling can reduce dust and overheating in some cases.
- What is tuck-pointing consideration? These bits are useful for removing old mortar before repointing; ensure joints are clean and free of loose material for best adherence.