Short answer: jackleg, stoper, sinker and drifter describe how a percussive rock drill is supported and fed into the rock—not simply four power levels. A jackleg uses an angled pneumatic leg for face drilling; a stoper is leg-fed for upward or overhead holes; a sinker is normally hand-held for downward drilling; and a drifter is mounted on a mechanical feed beam or rig. The names are useful for defining the machine class, but they do not prove that drill steels, chucks, controls or spare parts are interchangeable.
For mines, tunneling contractors, quarry crews and distributors, the practical job is to translate a regional equipment name into a complete configuration: drilling direction, support and feed, hole requirement, power source, flushing, shank, site clearance and operator controls. This guide provides that translation.
Jackleg vs stoper vs sinker vs drifter at a glance
| Term | Typical support and feed | Typical drilling direction | Primary distinction |
|---|---|---|---|
| Jackleg / air-leg drill | Rock drill on an angled telescopic pneumatic leg | Horizontal and inclined face holes; some upward angle | The articulated leg supports weight and applies thrust toward the face. |
| Stoper | Rock drill aligned with a telescopic leg beneath it | Upward or overhead holes | The tool-and-leg arrangement feeds toward the back or roof. |
| Sinker / plugger | Hand-held, commonly with T-handles; operator provides feed | Downward and down-angle holes | Portability and direct manual feed rather than a dedicated leg or feed beam. |
| Drifter | Carriage-mounted on a feed beam, rig, column or jumbo | Direction set by the feed and carrier | Machine feed and mounting separate it from hand-held and leg-mounted classes. |
These are functional descriptions, not universal standards. Suppliers and regions may use “air-leg,” “pusher-leg,” “jackleg,” “sinker,” “plugger” or “stoper” differently. The drawing, model, operating manual and interfaces should control the purchase—not the nickname alone.
What is a jackleg rock drill?
A jackleg is a rotary-percussive rock drill supported by a pneumatic feed leg. The leg is normally braced on the floor and angled toward the rock face. As the leg extends, it supports much of the drill’s weight and supplies feed force while the drill piston delivers impacts, the rotation mechanism turns the steel between blows and the flushing circuit removes cuttings.
Jacklegs are closely associated with underground development headings, narrow-vein mining and small tunnels because they can drill face holes without a full drill jumbo. “Jackleg” and “air-leg rock drill” often point to the same functional class, but they are not guaranteed model synonyms. One supplier may sell the drill body and leg as a matched assembly; another may list multiple leg lengths or suffixes.
A buyer should confirm the leg connection, retracted and extended dimensions, feed-control arrangement, drilling direction, water-flushing configuration and drill-steel shank. The active PerfoMax example in this class is the YT28 Air-Leg Pneumatic Rock Drill for 34–42 mm holes. That product reference does not make YT28 components interchangeable with every drill marketed as a jackleg.
What is a stoper rock drill?
A stoper is configured for upward drilling. Its telescopic leg is positioned beneath the drill so the assembly feeds the steel toward the roof or back. The name comes from underground stoping work, although stopers may also appear in raise work, overhead blast-hole drilling and some ground-support operations.
The spelling stoper is the established industry term; stopper drill also appears in searches and quotations. Treat the two words as a language clue, then verify the actual machine. A true stoper configuration needs controls and geometry that can be operated in the intended overhead position. A long air leg fitted to a normal face drill is not automatically a stoper.
Overhead drilling adds falling-rock, water, hose-control and operator-position hazards. Equipment classification never replaces the mine’s ground-control plan, exclusion zones, task training or manufacturer instructions. If the job occurs under unsupported ground, the correct decision may be mechanized bolting or another engineered method rather than a hand-operated stoper.
What is a sinker rock drill?
A sinker is generally a hand-held pneumatic rock drill used for downward or down-angle holes. The operator controls the tool through handles and supplies feed by body position and tool weight. “Plugger” is another regional name encountered for the same broad class. Small sinkers are used in quarry, construction, utility and secondary drilling tasks where portability matters.
A sinker is not merely a jackhammer pointed at the ground. A rock drill intended to create a borehole combines percussion with controlled rotation and cuttings removal. A demolition breaker normally drives a chisel without continuous drilling rotation or a borehole-flushing circuit. Confusing those outputs leads to the wrong tool, steel and safety plan.
The active Y19A hand-held pneumatic rock drill illustrates PerfoMax’s hand-held route, but a buyer should describe the intended direction and support rather than assuming that every hand-held drill is sold under the word “sinker.” The published hand-held vs air-leg rock drill guide explains the practical Y19A and YT28 distinction.
What is a drifter rock drill?
A drifter is a heavier rock drill mounted on a carriage that travels along a feed beam. The carrier may be a pneumatic column, crawler, quarry drill, tunneling jumbo or another rig. Feed force and alignment come from the machine feed rather than from a hand-held leg. Modern drifters may be pneumatic or hydraulic, so “drifter” does not by itself identify the power source.
Because the feed beam can be positioned by the carrier, a drifter may drill horizontal, inclined, vertical or overhead holes. Direction alone therefore cannot distinguish a drifter from a jackleg or stoper. The decisive features are the rigid machine mounting, guided travel and mechanical feed system.
Do not request a drifter by comparing only impact rate or air consumption with a hand-held drill. A drifter purchase also depends on feed-beam interface, shank adapter, rotation system, hydraulic or pneumatic services, flushing, control system, rod handling and carrier capacity. Those interfaces place it in a different procurement class.
Why drilling direction is useful—but not sufficient
Direction is the fastest first filter: face drilling suggests jackleg, overhead work suggests stoper, and downward hand-held work suggests sinker. However, four additional questions can change the answer:
- Who or what supplies feed? Operator weight, a pneumatic leg and a feed beam create different control and reaction-force conditions.
- How long and accurate must the hole be? A rigid guided feed generally offers more repeatability than a hand-held arrangement.
- How much working space is available? A leg needs a bracing point and extension envelope; a rig needs carrier access and setup room.
- What does the site safety system permit? Ground conditions, unsupported areas, vibration, noise, dust, water and hose routing may rule out a nominally suitable tool.
Machine class is therefore a boundary decision, not a substitute for an application review.
Can one drill body become a jackleg, stoper or sinker?
Some established product families have jackleg, stoper and sinker versions built around related internal architecture. That does not mean a buyer can convert any one into another by adding or removing a leg. Variants can differ in backhead, handles, control location, leg connection, exhaust, flushing parts, chuck, retainer, lubrication path and safety features.
Parts that look alike can also carry different revisions or tolerances. Before approving a conversion or spare-part substitution, obtain the complete model and suffix, serial or production range when available, exploded parts list, leg model, shank specification and photos of the interfaces. Follow the OEM’s approved configuration; do not create an improvised support arrangement.
Buyer decision table: which class should enter the RFQ?
| Job statement | Directionally correct class | Critical confirmation |
|---|---|---|
| Face holes in a narrow underground heading, with a stable floor bracing point | Jackleg / air-leg drill | Leg length and connection, working angle, hole requirement, shank and flushing. |
| Upward holes into the back or roof | Stoper or mechanized bolting/drilling system | Ground-control boundary, overhead controls, leg stroke, clearance and approved method. |
| Short downward holes in accessible stable stone | Sinker / hand-held rock drill | Operator handling limit, hole depth, flushing, shank, air supply and dust control. |
| Repeated production holes requiring guided feed and carrier positioning | Drifter on rig or feed beam | Carrier interface, feed, power system, shank adapter, rods, controls and rod handling. |
Common terminology mistakes that create purchasing loss
- Ordering by nickname: “Send a jackleg” omits the drill model, leg, shank, hose and flushing interfaces.
- Equating hole direction with machine class: a rig-mounted drifter can drill downward, but that does not make it a sinker.
- Treating air-leg as universal compatibility: the leg connection and suffix must match the drill configuration.
- Assuming shared family parts are interchangeable: similar external shape is not a controlled cross-reference.
- Confusing drilling with breaking: a rock drill creates a borehole using percussion, rotation and cuttings removal; a breaker delivers impact to a chisel.
- Ignoring the complete air system: compressor delivery, hose pressure loss, lubrication and water supply affect whether the selected machine can operate as specified.
RFQ checklist for pneumatic rock drill class and configuration
- Use case: development face, stoping, roof/raise, quarry, construction or another defined task.
- Drilling direction and angle range.
- Hole diameter, finished depth, expected straightness and production requirement.
- Rock description, fractures and water conditions.
- Required support: hand-held, air leg, stoper leg, column or feed beam.
- Available setup space, floor bracing point and overhead clearance.
- Rock-drill make, complete model, suffix and nameplate photos.
- Air pressure and flow available at the tool under load, plus hose length and inside diameter.
- Wet or dry flushing arrangement and site dust-control requirement.
- Drill-steel shank dimensions, steel family, length and bit connection.
- Leg model, stroke and drill-to-leg interface if applicable.
- Requested scope: drill only, matched leg, lubricator, hoses, steels, bits or spare-parts kit.
- Applicable site rules, operator training and documentation requirements.
For component-level understanding before completing that list, see Pneumatic Rock Drill Anatomy: How the Piston, Valve, Rifle Bar, Chuck, and Flushing Work.
Frequently asked questions
Is a jackleg the same as an air-leg rock drill?
They usually describe the same functional class: a hand-operated rotary-percussive drill supported and fed by a pneumatic leg. Because names vary by market, confirm the drill model, matched leg, connection and intended working angle.
What is the difference between a stoper and a jackleg?
A jackleg normally uses an angled leg to feed the drill toward a face. A stoper is arranged in line with its leg for upward or overhead drilling. The controls, geometry and approved applications can differ even when the internal drill family is related.
Can a sinker drill horizontally?
A hand-held drill may physically be used at different angles within its approved operating envelope, but “sinker” describes a class optimized for downward manual feed. Sustained horizontal face drilling generally points to an air-leg system that supports weight and applies feed.
Is a drifter always hydraulic?
No. Drifters can be pneumatic or hydraulic. The defining feature is carriage mounting and guided mechanical feed on a beam or rig, not the energy source alone.
Do jackleg, stoper and sinker drills use the same drill steel?
Sometimes related variants accept the same shank family, but the name cannot prove it. Confirm chuck size, shank length and geometry, retainer, steel system and bit connection against the exact model documentation.
Technical references
- NIOSH/CDC: Jackleg Drill Usage and Accidents
- NIOSH Engineering Controls: Reducing Hazardous Dust Exposure When Rock Drilling
- Crowder Supply: Rock Drill Buyer’s Guide
- Atlas Copco: Pneumatic Surface Rock Drills
Translate the job into a matched PerfoMax configuration
If the requirement is a leg-supported face-drilling system, review the active YT28 air-leg pneumatic rock drill. Send the drilling direction, hole size and depth, rock condition, available air and water, drill-steel shank and required supply scope with the inquiry. PerfoMax can then respond to a defined air-leg or hand-held requirement instead of relying on a regional nickname.