Bosch GBH18V-21 Boschhammer blue and black rotary hammer with a red handle.
Bosch GBH18V-21 rotary hammer, Boschhammer, featuring Multi-Function Selector, Electronic Motor and Cell Protection, Ergonomic Grip Zone, High Impact-to-Weight Ratio, and Brushless Motor.
GBH18V-21N
GBH18V-21N
GBH18V-21N
Bosch tool, visible text "BOSCH".
Bosch GBH18V-21 Boschhammer, cordless rotary hammer drill.
Blue tool with black grip.
Bosch GBH18V-21 rotary hammer, with an attached chisel bit, held by a person wearing a long sleeve shirt and gloves.
Person holding Bosch GBH18V-21 rotary hammer with a scraper attachment. The person wears gloves and a gray long-sleeved shirt.
Person holding a Boschhammer GBH18V-21 rotary hammer and scraper.
Bosch GBH18V-21 rotary hammer drill, with a chisel attachment, held by a person wearing work gloves and a gray long-sleeve shirt.
Bosch GBH18V-21 Boschhammer cordless rotary hammer drill being used to drill into a concrete wall.
Person wearing a hard hat, face mask, and high-visibility jacket operating a Bosch GBH18V-21 hammer drill to drill into a concrete column.
Bosch GBH18V-21 hammer drill being used by a person wearing safety glasses, ear plugs, a face mask, and a hard hat.
Bosch GBH18V-21 drill being used to drill into a white cinder block wall by a person wearing gloves and a respirator mask.
Bosch GBH18V-21 cordless Boschhammer with attached dust collection system, being used to drill into a white cinder block wall by a person wearing red long-sleeved shirt, black pants, brown jacket and work gloves.
Bosch GBH18V-21 hammer drill, with CORE18V 8 battery, removing tiles.
AVAILABLE MODES. Rotary Only with drill icon. Rotary Hammer with drill and hammer icons. Hammer Only with hammer icon.
Bosch CORE18V 4 Ah, 6 Ah and 8 Ah batteries, recommended for use with 18V bare tools, part of the AMPShare™ 18V Battery System.
AMP Share Multi-brand Compatible 18V Battery System, powered by BOSCH.
Bosch logo with "18V-Bare Tool", "18V Limited Warranty", and "5 YEAR Tool". Effective 6/1/23, all 18V products are covered by this updated warranty. For updated terms, visit https://rb-pt.io/PowerToolWarranty or call 1-877-BOSCH99.

GBH18V-21N Professional

Cordless Rotary Hammers

18V Brushless SDS-plus® Bulldog™ 3/4 In. Rotary Hammer (Bare Tool)

  • Powerful, compact cordless rotary hammer – features drilling performance plus chiseling in a lighter tool
  • Superior impact – delivers 1.5 Ft.-Lbs. of impact energy (EPTA) for maximum performance in drilling and chipping
  • Lightweight, at only 5.3 Lbs. (tool only, not including battery) – provides maneuverability for concrete drilling anywhere
  • Efficient brushless motor – maximizes battery runtime in extended applications
  • Battery requirement – compatible with Bosch 18V Li-ion batteries, but for optimal results, it requires a Bosch 18V 4.0 Ah battery or higher
  • Robust power system – produces 0-5,100 no-load bpm and 0-1,800 no-load rpm
  • Multi-function selector – three modes of operation: rotary hammer, rotation only and hammer only
  • Works with Bosch PRO+GUARD™ dust solutions – an end-to-end dust-collection system that helps users move toward OSHA Silica dust compliance
  • Ergonomic design – provides great user comfort, with a soft-grip handle
  • Electronic Motor and Cell Protection – helps protect motor and battery from overheating
  • SDS-plus® chuck – industry-standard system compatible with many bits
  • AMPShare™ System – designed to be multi-brand compatible across many cordless products to make managing your work day easier
  • AMPShare™ System compatibility – 18V batteries and chargers are compatible with Bosch 18V power tools and a growing list of cordless products from AMPShare™ brands
  • Bosch 18V cordless power tools are covered by a five year limited warranty – for details, visit https://rb-pt.io/PowerToolWarranty or call 1-877-BOSCH99
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GBH18V-21N Professional

Technical data

The most important data

Battery Chemistry
Lithium Ion
Battery/Charger
Not Included
Chuck Design
Keyless
Chuck Size
3/4 in
Drive System
SDS-plus
Height in
8.7 "
Impact Energy/EPTA (ft. lbs.)
1.5 Ft.-Lbs. EPTA
Length in
12.8 "
Max Bit Diameter
3/4"
Max. Capacity in Concrete
3/4"
Max. Capacity in Steel
1/2"
Max. Capacity in Wood
1-1/4"
Max. Hole Diameter in Concrete
3/4"
Max. Hole Diameter in Concrete-Thin Wall Core Bit
2-1/2"
No Load BPM
0-5,100
No Load RPM
0-1,800
Reverse
Yes
Variable Speed
Yes
Weight
5.3 lb
Width in
3.5 "
Works With
Dust Extraction/Collection Hoods, HDC100, HDC200, Keyless three-jaw Chuck with SDS-plus® Shank, HA3JAW
Includes
(1) GBH18V-21 18V Brushless SDS-plus® Bulldog™ 3/4 In. Rotary Hammer
(1) Auxiliary Handle
(1) Depth Gauge

GBH18V-21N Professional: Further information

Product Highlights

The Bosch GBH18V-21 18V Brushless 3/4-Inch SDS-plus® Bulldog™ Rotary Hammer delivers exceptional performance for anchoring in concrete, drilling in masonry, core cutting and chiseling. With 1.5 Ft.-Lbs. of impact energy and a no-load bpm rating of 0-5,100, this hammer work as hard as the user. It provides three modes – rotary hammer, rotation only and hammer only. The brushless motor and low weight of 5.3 Lbs. (tool only, not including battery) maximize runtime for extended applications and provide an outstanding impact-to-weight ratio. The powerful GBH18V-21 is compatible with Bosch 18V Li-ion batteries, but for optimal results, it requires a Bosch 18V 4.0 Ah battery or higher. This hammer works with Bosch PRO+GUARD™ dust solutions – an end-to-end dust-collection system that helps users move toward OSHA Silica dust compliance. It has an ergonomic design and soft-grip handle. It has Electronic Motor and Cell Protection to protect the tool and battery from overload.