GBH 18V-21 SDS+ Hammer Drill

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‹ SDS+ Hammer Drills

18V Professional · Brushless

GBH 18V-21 Sds+ hammer drill No product photo yet

SDS+ Hammer Drills · Bosch 18V Professional

Bosch GBH 18V-21 Professional Brushless SDS+ Rotary Hammer (Body Only)

2.4kg bare18V3 years (with registration)

18V brushless three mode SDS+ rotary hammer with 2 J impact energy for holes up to 21mm in concrete and light chiselling. Rotation control clutch and LED light.

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Impact energy

21mm

Max hole, concrete

5,100bpm

Impact rate

2.4kg

Weight (bare)

Where it sits among sds+ hammer drills

Against the 124 sds+ hammer drills we list. Not a score: bigger isn't always better for your job.

Impact energy2J

1J lowestMakita HR140Dhighest 5.8JBosch GBH 18V-34 CF

Max hole, concrete21mm

12mm lowestEinhell TE-HD 18/12 Lihighest 35mmHiKOKI DH3635DC

Impacts per minute5,100

2,900 lowestBosch GBH 18V-34 CFhighest 6,000Einhell TE-HD 18/12 Li

Weight (bare)2.4kg

1.5kg lightestEinhell TE-HD 18/12 Liheaviest 6.1kgEinhell RT-RH 32

Compare it with: + HiKOKI DH1826DC + Makita DHR202 + Einhell TE-HD 18/12 Li + Milwaukee M18 FH

Full specs

From Bosch's own documentation. Checked 03/10/2026. Report a spec error ›

Hammer & Drilling

Chuck systemSDS+

Impact energy2 J

Measured to EPTA✓ Yes

Impact rate5,100 bpm

No-load speed0–1,800

Max hole, concrete21 mm

Best range, concrete6–10mm

Max hole, wood30 mm

Max hole, steel13 mm

Power & Motor

Voltage18V

MotorBrushless

Modes & Handling

ModesHammer drilling / Drilling without impact / Vario-Lock chisel position / Chiselling

Chisel only✓ Yes

Chisel position lock✓ Yes

Drill only (no hammer)✓ Yes

BodyInline or D-handle

Safety clutch✓ Yes

Physical & Build

Weight (bare)2.4 kg

Weight (with battery)3 kg

LED work light✓ Yes

Noise level93 dB(A) LpA / 101 dB(A) LwA

Vibration (hammer drilling)15.5 m/s²

Vibration (chiselling)12.7 m/s²

Powered by Bosch 18V Professional · 13

All 13 batteries that fit this tool, smallest first. Kits and chargers ›

GBA18V-20 2.0Ah · 36Wh 0.35kg 2.75kg £56.99at Machine Mart + £4.99 delivery View at Machine Mart ›

GBA18V-30 3.0Ah 0.6kg 3.0kg No retailer price yet About this battery ›

PROCORE18V-40 4.0Ah · 72Wh 0.52kg 2.92kg from £54.99at Tooled Up + £6.95 delivery View at Tooled Up ›

GBA18V-40 4.0Ah · 72Wh 0.6kg 3.0kg from £73.99at Machine Mart + £4.99 delivery View at Machine Mart ›

EXBA18V-40 4.0Ah · 72Wh 0.61kg 3.01kg No retailer price yet About this battery ›

GBA18V-50 5.0Ah · 90Wh 0.62kg 3.02kg from £85.00at Machine Mart + £4.99 delivery View at Machine Mart ›

PROCORE18V-55 5.5Ah · 99Wh 0.96kg 3.36kg No retailer price yet About this battery ›

EXBA18V-55 5.5Ah · 99Wh 1.02kg 3.42kg from £157.95at Tooled Up + £6.95 delivery View at Tooled Up ›

Tool weight worked out by adding each pack's weight to the bare tool, using the makers' figures. The maker's own with-battery figure can differ slightly. We may earn a commission on retailer links.