The S250 hand-held pneumatic rock drill has been designed with an ideal power-to-weight ratio to ensure maximum production in development and stoping applications. Available in several configurations including the Jackleg, Stoper and Sinker, the S250 features precision leg controls, a lightweight design, and optional acoustic baffles that reduce operator fatigue, and its simple construction requires less frequent servicing than competitors’ hand-held drills.

  • Low cost-per-foot performance
  • Available in several configurations
  • Superior power-to-weight ratio
  • Requires less maintenance than competitive hand-held drills
  • Complimented by full range of hand-held drilling tools and accessories


Premium Materials

The S250 uses premium materials, machined to exacting specifications to deliver high performance and exceptional durability.

Proven Technology

Boart Longyear’s S250 rock drill is based on the well- established, market-leading S250 design.

Hex 22 mm and 25 mm Chuck Ends

Boart Longyear provides both 22 mm and 25 mm hex chuck ends to accommodate popular steel sizes.


The S250 is available in three primary variations including Jackleg, Stoper and Sinker, providing maximum utility for the specific customer needs. Both muffled and unmuffled versions are available.

Services and Training

Boart Longyear offers on-site services training and complete rebuild and overhaul service to ensure optimal drill performance and extended life.

Jackleg / Sinker Rock Drill Specification

Bore79.4 mm3.126 in
Stroke73.25 mm2.884 in
Blows / Minute2200 @ 6.2 bar90 psi
Air Consumption4.4m3/min @ 6.2 bar156 cfm @ 90 psi
Air Connection-1 in BSP
Water Connection-1/2 in BSP
Leg Thrust 244 kg @ 6.2 bar 537 lb @ 90 psi
Leg Extension - Standard 762 mm 30 in
Leg Extension - Optional 610 mm 24 in
Notes*1. The figures in these tables have been calculated based on field experience, and may be reasonably expected.
2. Actual drilling capacity will depend on in-hole tools and conditions, drilling techniques and equipment used.

Supply Hose ID (required)

Air 25 mm 1 in
Water 12 mm 1/2 in

Steel Size (HEX) - Chuck End

Standard22 mm HEX x 108 mm long7/8 in HEX x 4-1/4 in long
Optional25 mm HEX x 108 mm long1 in HEX x 4-1/4 in long
* Drill designed to accept collared/tapered HEX steel to ISO standard 723

Standard S250 Airleg (Sold Separately)

Bore Diameter68 mm2.677 in
Stroke Length1295 mm51 in
Thrust230 kg at 6.2 bar506 lb @ 90 psi


Metric U.S.
Muffled42.2 kg93 lb
Unmuffled41.3 kg91 lb


Football Style Lubricator
4 hours drilling capacity with S250 rockdrill
Install in line, within 3.5 m (12 ft) of rockdrill
Weight: 4.8 kg (10.6 lb)
Capacity: 600 mL (36.6 in3) rockdrill oil
Min/Max Adjustment: 1/4 turn

Optional S250 Airleg (Sold Separately)

Stroke Length991 mm39 in
Stroke Length762 mm30 in

Noise Emissions*

MuffledNoise Pressure 113.5 dB(A)
Power 126.5 dB(A)
UnmuffledNoise Pressure 116.0 dB(A)
Power 129.0 dB(A)
Notes:Noise levels are measured in accordance with ISO3744 and SANS1470 (Part 4)
Boart Longyear has done extensive research and testing in noise reduction and have found that a proper hearing conservation program is an effective means of dealing with elevated noise levels.

Steel Size (Hex) - Chuck End

Bore Diameter68 mm2.677 in
Stroke Length1295 mm51 in
Thrust230 kg at 6.2 bar506 lb @ 90 psi

Mounting Option

OptionMuffledLengths/StrokesWater Valve
JacklegWith or Without3 Airleg options
StoperWith or Without3 Airleg optionsWith or without
SinkerWith or Without

Base Options

Sinker Conversion Kit
S250 Drill Repair Kit
Football Lubricator