42mm SDS Max Rotary Hammer Drill Bit 20in - Carbide Tip Masonry

In this review the 42mm SDS Max rotary hammer drill bit is evaluated for heavy masonry work and demanding concrete drilling. The bottom line: this bit is for contractors and serious DIYers who need a long, sturdy carbide-tipped bit that reaches deep into concrete and brick. Our review finds the 20in length and 15in effective drilling depth make it a practical choice when single-hole reach matters, and the SDS Max shank offers secure hammer tool retention for sustained rotary hammer use.

Key Features

• 42mm Diameter: The large 1-2/3 in cutting diameter clears wide holes quickly and is suited to anchor or conduit preparations.
• 520mm Total Length: The 20in overall length provides reach for deep cores and through-wall jobs without switching to extensions.
• 380mm Drilling Depth: With approximately 15in effective depth the bit handles deep anchoring tasks in concrete and masonry in one pass.
• SDS Max Shank: The SDS Max shank (about 18mm) ensures a secure fit in compatible rotary hammers for stable drilling under heavy load.
• Carbide Tip: The alloy steel body combined with a carbide tip increases wear resistance and maintains cutting performance in abrasive materials like brick and stone.

Who It's For

This drill bit is aimed at professional tradespeople and experienced DIY users who regularly drill into concrete, block, brick, or stone and need a single long bit to reach deep anchor points. It is especially useful on jobs where swapping shorter bits or using extensions would slow progress.

Users with light occasional chores or who own rotary hammers that do not accept SDS Max shanks should look for shorter bits or those with a compatible shank type. Also, if your work requires ultra-precision or extremely frequent regrinds, a specialist bit system may be preferable.

Pros & Cons

Pros

• Large 42mm diameter drills wide holes quickly for anchors and sleeves.
• Long 520mm length and 380mm effective depth reduce the need for extensions on deep work.
• SDS Max shank provides secure retention and reliable transfer of hammer impact energy.
• Carbide tip improves tip strength and helps the bit last longer when drilling abrasive masonry.

Cons

• Mixed feedback on tip strength suggests occasional variability in durability under extreme usage.
• Its size and weight make it overkill for small household tasks and require a compatible heavy-duty rotary hammer.

Specifications

Brand	GRIXLEN
Diameter	42mm (1-2/3 in)
Total Length	520mm (20 in)
Drilling Depth	380mm (15 in)
Shank Type	SDS Max (approx 18mm)
Tip Material	Carbide
Body Material	Alloy Steel

Our Verdict

The 42mm SDS Max 20in rotary hammer bit is a practical, cost-effective option for professionals and serious DIYers who need deep, wide holes in concrete and masonry. It pairs well with heavy-duty rotary hammers and delivers good drilling performance and reach, though users should inspect tip wear after heavy use given some mixed comments about tip strength.

Frequently Asked Questions

Will this bit fit my rotary hammer?
The bit uses an SDS Max shank (roughly 18mm) and will fit rotary hammers that accept SDS Max; it will not fit smaller SDS Plus chucks.

How deep can it drill in one pass?
The total length is 520mm with an effective drilling depth of about 380mm (15 in), suitable for deep anchor holes without extensions.

Is it suitable for brick and stone as well as concrete?
Yes, the alloy steel body with a carbide tip is intended for masonry, brick, stone, and concrete applications.