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Bosch 12 -Amp 1-9/16-in SDS-max Variable Speed Rotary Hammer Drill

Name: Bosch 12 -Amp 1-9/16-in SDS-max Variable Speed Rotary Hammer Drill
Brand: Bosch
SKU: 50149884
Price: 459 USD
Availability: InStock
Rating: 4.4 (81 reviews)

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4.4

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Tue, Oct 13

78 available

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Mon, Oct 12

12 available

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The Bosch RH540M SDS-max® 1-9/16 In. Combination Hammer is a rotary hammer and hammer-only tool designed for concrete contractors and professional remodelers who need a powerful and versatile tool. It delivers 6.1 Ft.-Lbs. of impact energy while weighing in at only 15.2 Lbs. The motor is rated at 170 to 340 RPM in rotary mode and 1,200 to 2,750 BPM in hammer mode, which will easily reduce concrete to dust. Its SDS-max® bit system allows tool-free and one-handed bit changes. The Vario-Lock mechanism lets users angle the chisel into 12 different positions to optimize the working angle. The hammer has a Dual Mode Selector Knob and service minder brushes, which clearly indicate when preventive maintenance is required.

6.1 Ft-Lbs of impact energy, up to 20 percent more than other combo rotary hammers
SDS-max® bit system for tool-free easy bit changes
Vario-Lock mechanism allows 12 positions for best chisel angle
Combination dual mode selector knob rotary hammer mode or hammer-only mode
Service minder brushes
Innovative service modules

General
Sub-Brand	N/A	Chuck Type	SDS-max
Bare Tool	No	Handle Type	D-handle with soft grip
Package Contents	Includes: RH540M combination hammer, auxiliary handle, carrying	Main Handle Type	Auxiliary Handle
Package Quantity	1	Color/Finish Family	Blue

Dimensions
Amperage	12	Battery Amp Hours	0
Cord Length (Feet)	8	Maximum Chuck Size	1-9/16-in
Core Bit Capacity (Inches)	4	Tool Width (Inches)	4
Thin Wall Core Bit Capacity	No	Tool Height (Inches)	10.5
Thru-hole Capacity (Inches)	2.5	Maximum Capacity Concrete (Inches)	1.5625
Tool Weight (lbs.)	15.2	Maximum Capacity Steel (Inches)	0
Tool Length (Inches)	19	Maximum Capacity Wood (Inches)	0

Features
Forward and Reverse Switch Included	No	Keyed/Keyless	Keyless
Hybrid Capable	No	Maximum RPM	340
Voltage (Volts)	120	Cordless	No
Case Included	Yes	Tool Power Output	23 in-lbs
Charge Time (Minutes)	0	Side Handle Included	Yes
Number of Batteries Included	0	Maximum BPM	2900
Variable Speed	Yes	Impact Energy (Foot/lbs.)	6.1
Chisel Lock Positions	Yes	Operation Modes	Hammer; rotary hammer
Electronic Speed Control	No

Compatibility
Works with iOS	No	App Compatibility	No
Works with Android	No	Bluetooth Compatibility	No
Wi-Fi Compatibility	No

Warranty
Warranty	1-year limited	Tool Warranty	1-year

Certifications
CA Residents: Prop 65 Warning(s)	No	Safety Listing	CSA safety listing

Miscellaneous
UNSPSC	27112700

Check out the Best Selling Rotary Hammer Drills on Lowes.com

Review

4.4 out of 5

81 Reviews

86% Recommend this product

Ratings may include incentivized customer reviews.

What Customers Are Saying

The rotary hammer drill is a powerful and versatile tool that excels at drilling and chipping concrete. Many users praise its strength, durability, and ease of use, noting its ability to quickly and effortlessly drill through tough materials. The compact size and lightweight design are also highlighted as positive features. However, some users have experienced issues with the tool's reliability and longevity, with motor burnouts and other mechanical problems being common complaints. The tool may be suitable for DIY and light-to-medium construction work, but its long-term reliability may be a concern for more heavy-duty applications.

Customer review summary generated by AI, including incentivized reviews.

81 Customer Reviews

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Exceptional tool

Would Recommend

I have two of these they worked so good that I bought a second one. This tool is underrated. I've not seen a job or workload that this tool has not been able to handle. A+

BabyJune 23, 2026

From boschtools.com

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86Ym9zY2h0b29scw/7bc378a2-086b-5495-82ba-ee603c584224

Great tool

How fast it went thru

May 30, 2026
Verified Purchaser

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Solid semi-professional breaker

Would Recommend

This hammer has been a workhorse for us for years. It was the only sds-max option that was available in my area at the time. It has no active vibration reduction so its not the easiest on your body but its done everything from a 6in paddle for tile removal to point chisels for breaking out 6in slabs. Super solid hammer, 5 years of commercial flooring use and its still going strong. Its been our main breaker for the whole time so its seen some hours. Keep it greased and dont let it get too hot, a...

FloormattJanuary 16, 2026

From boschtools.com

Packaging is poor, product is great

Would Recommend

Ordered online and packaging was inadequate and it was beat up-Lowe’s need to out a heavy item like this in an exterior corrugated shipping box. Product itself works well. Used it to chip thru 2’ of rock

Az123November 26, 2025
Verified Purchaser

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86bG93ZXM/b090f2a9-b487-54e8-a86e-2c508d189de1

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86bG93ZXM/7c6709e7-1c13-5cb3-9be6-6f80f667f3d0

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86bG93ZXM/26053292-5b6c-5d93-a67a-85690e0b5b7a

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Hubby drill

Would Recommend

Gift for Husband and he loved it ! Got the job done with ease !

MD74July 7, 2025
Verified Purchaser

Was this Review Helpful ?

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		Name	Current Item Bosch12 -Amp 1-9/16-in SDS-max Variable Speed Rotary Hammer Drill
		Ratings	81
		Cordless
		Impact Energy (Foot/lbs.)	6.1
		Maximum Capacity Concrete (Inches)	1.5625
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1	1.625	1.7500	1.56	36	1.625	1.25	1.5625	1.25