CAT CLASS: HQ-10393

1-2 in Rotary Hammer

The 1-2 in rotary hammer class represents SDS-Max tooling systems designed for rebar dowel installation, larger concrete anchors, and light chipping in slab and block. This size class is the only rung on the rotary hammer ladder, handling carbide bits up to 1.9 in and core bits up to 6 in diameter. These tools bridge the gap between lighter SDS-Plus hammers and dedicated core drilling or demolition equipment.

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Models

Brands

Key specifications

Specification	Typical range	What it means
Max carbide bit diameter	1.1–1.9 in (27.9–48.3 mm)	Largest solid carbide percussion bit the hammer can drive effectively through concrete and masonry.
Max core bit diameter	2.6–6 in (6.6–15.2 cm)	Largest hollow core bit the tool can rotate under load for deep anchor holes and utility penetrations.
Chuck system	SDS-Max	Tool-free shank standard for heavy-duty hammers, larger than SDS-Plus and incompatible with lighter tools.

How to choose

This size class is appropriate when drilling dowel holes for rebar epoxy sets, installing large wedge or sleeve anchors exceeding 3/4 in diameter, or performing light chipping to remove thin slabs or prepare rough surfaces. Work requiring smaller percussion holes (under 1 in) or handheld portability is typically handled by lighter SDS-Plus tools not classified in this ladder. Jobs demanding continuous heavy demolition, large-diameter core drilling beyond 6 in, or high production rates call for dedicated breakers or stand-mounted core rigs rather than handheld rotary hammers.

What this size handles

Drilling 1.5 in rebar dowel holes into bridge deck or slab edge for structural tie-ins
Installing 1 in diameter wedge anchors through CMU or cast-in-place foundation walls
Coring 4–6 in penetrations for electrical conduit or plumbing risers in residential foundations
Light chipping to remove tile, thin topping slabs, or mortar beds on horizontal surfaces
Setting post-installed anchors for heavy mechanical equipment on industrial floors
Preparing keyed surfaces for overlay pours by roughening existing concrete slabs

Safety & operation

Hearing protection mandatory due to impact mechanism noise; doubling with earplugs and muffs common in enclosed spaces
Respirator or dust extraction required when drilling concrete or masonry to control crystalline silica exposure
Two-handed grip and secure footing essential to manage torque reaction when bits bind or break through
Eye protection and gloves standard; flying debris and sharp bit edges present cut and impact hazards during bit changes

Transport & logistics

Handheld tools typically carried in manufacturer cases or gang boxes alongside accessories and bits
Total kit weight including hammer, bits, extensions, and chisels often requires two-person handling or cart for multi-story access
Standard pickup truck or van transport; no trailer or special rigging required for the tool itself

Power & supply

Corded electric models require 120V or 240V outlets with 15–20 amp service and adequate extension cord gauge for distance
Temporary power distribution or generator capacity must account for start-up surge and sustained load during drilling
Battery-powered SDS-Max platforms draw from 18V or higher lithium-ion systems with multiple high-capacity packs for production work

Frequently asked

What distinguishes SDS-Max from SDS-Plus rotary hammers?

SDS-Max tools use a larger shank (18 mm vs. 10 mm) and deliver higher impact energy for drilling larger holes and heavier chipping, while SDS-Plus hammers prioritize lighter weight and maneuverability for smaller fastener and anchor work.

Can this size class handle continuous demolition work?

While capable of light chipping and surface preparation, 1-2 in rotary hammers are primarily drilling tools; sustained heavy breaking is better suited to dedicated demolition hammers or breakers with higher impact energy and duty cycles.

What limits core bit diameter in this class?

Motor torque, arbor thread capacity, and operator control all constrain maximum core bit size; bits beyond 6 in typically require stand-mounted rigs or hand-held core drills with dual handles and anchoring systems.