Air Pick

What is an Air Pick

An air pick is a hand-held, compressed-air percussive demolition and chipping tool. Compressed air drives a reciprocating piston, also called the rammer, inside a cylinder; the piston repeatedly strikes the tail of an inserted steel tool bit, which transmits impact energy into the workpiece to fracture concrete, masonry, soft rock, frozen earth, asphalt and coal. In Chinese it is the 气镐 or 风镐, conventionally numbered as the "G-series." It is a single product type, a leaf category, not an equipment family, and it sits under Construction Tools › Pneumatic Tools, alongside other compressed-air tools such as the air impact wrench and the pneumatic nail gun, which share the same air supply but apply it to fastening rather than demolition.

The air pick occupies the light-to-medium tier of pneumatic percussive tools. Above it sits the heavier paving breaker, or jackhammer, in the TEX/B-class at roughly 20 to 40 kg, used to break thick concrete and asphalt. Distinct from both is the rotary-percussive rock drill (凿岩机), which adds bit rotation to drill holes rather than simply chipping, as do the electric rotary hammer and the lighter impact drill used for the same drilling duty on the building site. The defining behavioural difference is simple but essential: an air pick only hammers, it does not rotate the bit. Confusing these classes is the most common naming error in this category, and it leads buyers to specify the wrong tool entirely.

The operating principle is a four-step cycle. First, compressed air, typically at 0.4 to 0.63 MPa (4 to 6.3 bar), enters through the inlet, and a valve or air-distribution mechanism alternately ports air to the back and front of the cylinder. Second, the pressure difference accelerates the piston forward; at the end of the stroke it strikes the shank end of the tool bit, transferring kinetic energy as a stress (impact) wave. Third, the valve reverses the airflow, returning the piston, and the cycle repeats many times per second, defining the impact frequency. Fourth, spent air exhausts through ports, which also provides some self-cleaning and cooling.

Performance is governed by the trade-off between impact energy, the energy delivered per blow, and impact frequency, the number of blows per second. A heavier or longer-stroke piston delivers more energy per blow but at a lower frequency, because the larger reciprocating mass cannot cycle as fast. The practical consequence is a useful rule of thumb: effective breaking power is approximately impact energy multiplied by frequency. Two picks can deliver similar gross output through very different combinations of these two numbers, and the correct combination depends entirely on the material and task.

Photo: Bundesarchiv, Bild 183-46780-0001 / Schlegel, CC BY-SA 3.0 DE, via Wikimedia Commons

It is worth dwelling on the impact wave, because it explains both the tool's effectiveness and its wear. When the piston strikes the shank, it does not push the bit so much as launch a stress wave that races down the steel and unloads its energy where the bit tip meets the workpiece. A well-matched bit and a clean, square shank end transmit that wave efficiently; a mushroomed or loose shank scatters energy as heat and noise instead of breaking material. This is why bit condition and correct seating in the retainer affect breaking rate as much as the headline impact-energy figure does, and why a tired bit can make a healthy pick feel underpowered.

Why does the pneumatic pick persist when electric demolition hammers exist? The answer is intrinsic safety. Because a pneumatic pick has no electrics and produces no sparks, it is the preferred choice for coal mines, underground works, wet or underwater tasks, and explosive atmospheres, where an electric tool would be hazardous. Combined with mechanical simplicity, tolerance of dust and water, and the ability to run continuously without thermal overload, this safety advantage keeps air picks in service across mining, civil demolition, road works and utilities long after electric alternatives became common.

Tool-Bit (Chisel) Types

An air pick is only as effective as the steel bit fitted to it, and selecting the bit geometry by job is the single fastest way to improve breaking performance. The same pick can trench, demolish, cut asphalt or dig soft ground depending purely on which chisel is inserted. Four bit families cover almost all field work, distinguished by how they concentrate the impact wave: on a point, on a line, or across a broad blade. The table below summarises the four and their typical jobs.

Moil point. A conical single point, the moil point is the most common bit. By concentrating all the impact energy onto one spot, it achieves maximum penetration into hard material, making it the default for general demolition and reinforced concrete. Its weakness mirrors its strength: it punches holes rather than separating material along a face, so it is less suited to controlled cutting or trenching where a clean line is wanted.

Flat and wedge chisel. A flat or wedge chisel concentrates force along a line rather than a point, which is exactly what trenching, cutting and edge work require. The linear edge propagates a crack along a controlled path, letting an operator score and split slabs, cut channels for conduit, or dress an edge without shattering surrounding material. It is the second most-reached-for bit after the moil point.

Wide chisel and asphalt cutter (spade). A broad blade spreads the impact across a wide face, trading penetration for coverage. This is the right tool for softer materials, notably asphalt and blacktop, and for clay. The wide face slices and lifts rather than punching through, which is why it is sometimes called an asphalt cutter. The closely related clay spade extends the same broad-face logic to digging, tamping and working soft ground.

A practical field habit is to keep at least a moil point and a flat chisel on every pick, because most demolition tasks alternate between breaking through and splitting along an edge. Operators often start a hole or a weak point with the moil point, then switch to the flat chisel to run a controlled crack outward from it. On asphalt and soft ground the wide chisel and spade replace both, sacrificing penetration for the coverage those materials reward. Carrying the right two or three bits is usually cheaper and faster than forcing one bit to do a job its geometry was never meant for.

Whatever the geometry, compatibility is decided at the shank. The shank and collar dimension must match the tool retainer of the pick: G-series picks use a defined shank per JB/T 5131, and the common pick-shank reference size is around 24 to 25 mm, in hex or round form. A bit with the wrong shank simply will not seat or retain, regardless of how well its working end suits the material, so shank verification is the first compatibility check before any bit purchase. Because the bit is a consumable forged from tool steel, also confirm that replacement bits to the same JB/T 5131 shank are readily stocked for the pick you choose, so a worn or broken bit never idles a crew.

Percussion Technologies

Every air pick converts compressed air into repeated hammer blows, but the engineering choices inside the tool determine how reliably and comfortably it does so. Three technology dimensions matter to a buyer: the air-distribution mechanism that drives reciprocation, the vibration and noise control built into the handle, and the protective and serviceability features such as idle-stop and lubrication. Understanding these explains why two picks with identical headline specs can feel and last very differently in the field.

Air-distribution mechanism. The valve or air-distribution box is the heart of the tool. It alternately ports compressed air to the back and front of the cylinder, accelerating the piston forward into the bit shank and then reversing the flow to return it. Both valved and valveless designs exist; valveless designs reduce part count and a potential wear point, while valved designs can offer more deterministic timing. The piston (rammer) and the cylinder (barrel) form the wear-critical pair, and the geometry of this pair, especially the bore diameter and stroke length, sets the impact energy and frequency the tool can deliver.

Vibration and noise control. Percussive tools transmit substantial energy back into the operator's hands and arms, so the handle assembly is a genuine technology, not just a grip. Better models use vibration-damped, anti-vibration handles to cut hand-arm vibration (HAV) over a shift. Vibration and noise are increasingly specified, and for good reason: they are compliance-driven, governed by occupational exposure limits under EU and ISO frameworks, not merely comfort features. For context, heavier paving breakers in the Atlas Copco/Epiroc TEX range achieve vibration-reduced handles down to roughly 4 to 5 m/s², illustrating how far handle engineering has advanced in the broader percussive family.

Protection and serviceability. The tool retainer or latch spring holds the bit shank; on better models, the tool automatically stops hammering when the bit breaks free of the work, an idle or no-load protection that prevents the piston from pounding internals when the bit suddenly meets no resistance. Because the piston and cylinder are the wear-critical pair, the availability of these wear parts is a real purchasing consideration. An inline lubricator, an oiler fitted in the air line, keeps the piston and cylinder lubricated and materially extends service life; some sites and tool classes require it.

Photo: Btr, CC BY-SA 2.5, via Wikimedia Commons

It is worth fixing terminology here, because the market uses it loosely. "Air pick," "pneumatic pick," "chipping hammer" and "pneumatic splitter" are often treated as synonyms, but the G-series is the precise hand-held pick class. The lighter overlap with this class is represented by chipping hammers such as the Atlas Copco/Epiroc TEX319 and TEX321. None of these should be conflated with rotary rock drills (凿岩机), which rotate the bit to drill, or with the large jackhammers and paving breakers that sit a tier above in weight and energy.

Materials and Process Media

An air pick is a system of hardened steel parts, an air supply and a target material. Getting durable performance means matching the materials inside the tool to the percussive duty, and matching the bit and the whole tool to the medium being broken. This chapter covers both: the construction materials of the pick and its bit, and the range of process media the tool is designed to fracture.

Cylinder and piston. The cylinder (barrel) and the piston (rammer) are the wear-critical pair, made from hardened, heat-treated alloy steel. They take the full force of every blow and slide against each other thousands of times per minute, so their hardness, surface finish and clearance govern both efficiency and service life. Wear here is the most common reason a pick loses impact energy over time, which is why piston and cylinder availability belongs on the procurement checklist.

Valve, handle and retainer. The valve or air-distribution box controls reciprocation and may be valved or valveless. The handle assembly carries the throttle or trigger and, on better models, vibration damping. The tool retainer or latch spring holds the shank and, where fitted, provides the idle-stop behaviour that protects internals when the bit breaks free. These components are not the wear pair but they determine usability, compliance and the no-load protection that keeps the wear pair healthy.

Inserted tool bit. The steel bit, whether moil point, flat or wedge chisel, wide asphalt chisel, or spade, is forged from tool steel and is governed in China by JB/T 5131. It is a consumable: it dulls, mushrooms at the shank and eventually must be reground or replaced. Bit steel quality and correct heat treatment directly affect how long a sharp working edge survives in abrasive material.

Air supply parts. Beyond the tool itself, the air hose and couplings and an optional inline lubricator complete the working system. The lubricator keeps the piston and cylinder oiled, and the hose must be correctly sized, because an undersized hose starves the tool. The table below maps common target media to the appropriate bit and notes the key consideration for each.

One material-adjacent point underpins all of the above: because the air pick is intrinsically safe, with no electrics and no sparks, it is the medium-independent choice wherever the atmosphere itself is hazardous. In coal mines, underground works, and wet or underwater settings, the breaking medium matters less than the fact that a pneumatic tool will not ignite the surroundings, which is why air picks dominate these environments regardless of what is being broken.

Key Specification Parameters

Reading an air pick datasheet is a fundamental purchasing skill, and for the Chinese G-series the spec sheet is unusually readable: the model number corresponds approximately to the tool weight in kilograms. The table below compares the three mainstream models, G7, G10 and G15, on the parameters a buyer actually compares, with ranges cross-verified across three manufacturer datasheets. Notice how impact energy rises and impact frequency falls as the model gets larger, the direct expression of the energy-versus-frequency trade-off introduced in Chapter 1.

Working air pressure. Air picks run at 0.4 to 0.63 MPa (4 to 6.3 bar, roughly 58 to 91 psi), with the tool-class nominal commonly 0.5 to 0.63 MPa. Pressure matters because impact energy depends on it: feed a pick too little pressure and it loses breaking power. Watch the decimal carefully. The working pressure is 0.4 to 0.63 MPa, not "0.4 to 63 MPa," an OCR or listing error frequently seen in marketplace specifications that would imply a wildly unrealistic figure.

Impact energy and frequency. Single-blow impact energy (单次冲击功) for picks is about 30 to 55 J; paving breakers go higher. Impact frequency (冲击频率) is about 15 to 22 Hz, equivalent to roughly 900 to 1300 blows per minute. The two are inverse to model size: a bigger model delivers higher energy at lower frequency. Note the unit conversion, because datasheets mix Hz and blows per minute: frequency in Hz multiplied by 60 gives blows per minute, so 21.6 Hz equals about 1300 bpm. Useful output is approximately energy times frequency.

Air consumption. Picks consume about 20 to 27 L/s, roughly 1.2 to 1.6 m³/min, or about 42 to 57 cfm depending on size. This is arguably the most consequential single number on the sheet, because it drives the required compressor, a critical sizing input. Closely linked is the cylinder bore diameter of φ35 to 42 mm: the bore dominates air consumption because the piston area is proportional to the diameter squared, so a small increase in bore produces a larger jump in air demand.

Hose, vibration and noise. The hose inner diameter, about 13 to 19 mm, is a parameter buyers often forget; an undersized hose starves the tool and cuts performance even with an adequate compressor. Finally, hand-arm vibration and noise are increasingly specified. They should be treated as compliance-driven, not nice-to-have, because of EU and ISO occupational exposure limits. Vibration is declared per ISO 28927-10 in m/s² and noise per ISO 15744 in dB(A), with EN 12096 providing the declaration framework. For context only, and not as air-pick figures, neighbouring Atlas Copco/Epiroc TEX paving breakers run roughly 20 to 40 kg, about 1100 to 1320 bpm, and about 30 to 90 cfm.

Selection Decision Factors

To turn the preceding chapters into a specific model, follow the decision sequence below. As with most percussive-tool purchases, mistakes rarely come from a single wrong number; they come from deciding the wrong thing first, such as fixing on a model before the compressor is sized. These seven factors can serve as a fixed RFQ template for air picks.

1. Match the job to impact energy and frequency: light chipping, tile or render removal calls for a small pick in the G7 or chipping-hammer class, with higher frequency and lower energy; heavy concrete or asphalt calls for a larger G10 or G15, or a step up to a paving breaker. Remember that effective output is approximately energy multiplied by frequency.
2. Size the compressor to air consumption: sum the tool air demand in L/s or m³/min at the rated pressure and add margin. An undersized compressor drops pressure and kills impact energy. Confirm the hose inner diameter (about 13 to 19 mm) is large enough so the tool is not starved.
3. Bit and shank compatibility: choose moil, flat or asphalt chisel for the material per Chapter 2, then verify the shank size matches the tool retainer. For G-series picks the shank follows JB/T 5131, commonly around 24 to 25 mm.
4. Ergonomics and compliance: check the declared hand-arm vibration (m/s², per ISO 28927-10) and noise (dB(A), per ISO 15744), and favour an anti-vibration handle. Weight and trigger feel matter for shift-long use and for staying within legal exposure limits.
5. Operating environment: pneumatic picks are intrinsically safe, with no electrics or sparks, which makes them the preferred and often mandatory choice for coal mines, underground works, wet or underwater tasks and explosive atmospheres. This is a key reason air picks persist against electric demolition hammers.
6. Auto-stop, lubrication and serviceability: idle-stop protection when the bit breaks through safeguards the internals; check that piston and cylinder wear parts are available and decide whether an inline lubricator is needed for your duty cycle.
7. Weight versus fatigue: a heavier model gives more power but more operator fatigue. Balance the breaking task against the hours the operator will hold the tool; the most powerful pick is not the best choice if it cannot be used safely for a full shift.

A note on sourcing. The air pick market spans premium and volume tiers. Atlas Copco/Epiroc (Sweden) and Chicago Pneumatic, in the Atlas Copco group, supply the TEX and CP chipping hammers and breakers that bracket the pick class; representative ranges include the TEX 230 and 280PE breakers, the TEX 319 and 321 chipping hammers, the RRD37 and RRD57, and Chicago Pneumatic's CP300 and RX-series tools. Toku (Japan) developed the G7/TCA-7 class technology that is widely licensed. Within China, Kaishan (开山) makes G-series picks such as the G10, and a large base of regional makers in Hebei and Shandong is the dominant volume source for G7, G10, G15 and G20 picks and the JB/T 5131 chisels that go with them. Match the supplier tier to the criticality of the work and to the availability of wear parts and service near your site.

One closing discipline ties the whole selection together: verify the numbers against a real datasheet, not a marketplace listing. The most damaging errors in this category are transcription mistakes, the classic being a working pressure printed as "0.4 to 63 MPa" when the tool runs at 0.4 to 0.63 MPa, and a frequency quoted in blows per minute being mistaken for hertz or vice versa. Cross-check working pressure, impact energy, frequency and air consumption against the JB/T 9848-2023 product standard and the manufacturer's own document, confirm the bit shank against JB/T 5131, and require declared vibration and noise figures per ISO 28927-10 and ISO 15744 where exposure limits apply. A pick that matches the job on paper but cannot be fed enough air, or whose bits cannot be sourced locally, will disappoint regardless of how good its headline specification looks.