Chipping Hammer and Air Hammer Shanks Explained

The most common question we field at Champion Chisel Works is not about power or price - it is “will this bit fit my hammer?” It is a fair question, because a chisel that looks right can still be wrong if the shank, collar, and retainer do not match the tool. Get the fitment right and a chisel drops in, seats, and stays put through thousands of blows. Get it wrong and the bit rattles loose, falls out, or will not seat at all. This guide demystifies air-tool shanks so you can order the right steel the first time. We have been making cross-compatible demolition and chipping steel in Rock Falls, Illinois since 1968, and the whole point of our catalog is that you do not have to buy a new tool to get the right bit.

What a shank is - and why it decides fit

The shank is the plain end of the chisel that goes into the tool. It is the mechanical interface between the bit and the hammer, and it has three parts that all have to line up: the shank size and shape (how big it is and whether it is hex or round), the collar (the raised ring the retainer catches), and the retainer on the tool that actually holds the bit in. Think of it like a key: the blade of the key can be any shape you need for the job, but the part that goes into the lock has to match the lock exactly. Everything below is about identifying your “lock.”

The two everyday chipping-hammer shanks: .580 hex and .680 round

For pneumatic chipping hammers, the vast majority of tools use one of two shank styles. The .580″ hex shank is the lighter-duty, extremely common standard; the hex flats also keep the bit from spinning. The .680″ round shank is a slightly larger, heavier-duty option for harder use. Champion carries chisels in both, and in each you will find the full range of working ends - moil points, narrow chisels, wide chisels, and clay spades - so you can outfit whatever shank your hammer runs. You can shop them directly: .580 hex, round collar, .580 hex, oval collar, .680 round, round collar, and .680 round, oval collar.

Collars and retainers: the part people miss

Here is where most fitment mistakes happen. Two chisels can share the same .580 hex shank and still not interchange, because their collars are different and the collar has to match the tool's retainer. The collar is the ring near the top of the shank; the retainer is the mechanism on the hammer - a spring, a latch, or a quick-change sleeve - that grabs that collar and keeps the bit from flying out. Champion offers chisels with a round collar or an oval collar, and our tools are built to match: the mini 4-bolt chipping hammers, for instance, come in oval-collar, round-collar, and quick-change retainer versions for both .580 hex and .680 round shanks. If a retainer is worn, a simple retainer spring or a fresh retainer from our retainers and accessories line usually restores a solid hold.

Shank size, collar type, and retainer style all have to match the hammer.

The bigger shank map: breakers, rivet busters, and drills

Chipping hammers are just one corner of the shank world. As tools get heavier or switch from air to electric, the shanks change with them. Rather than memorize it, use this as a quick orientation and then match to your specific tool.

Each of those has its own catalog home - the heavy-duty pavement breaker steel line by hex size, the jumbo rivet buster steel, the .401 turn-type zip gun bits, and the full electric demolition hammer steel range. The principle never changes: identify the shank the tool is built around, then choose the working end you need in that shank.

Brand compatibility: does Champion steel fit my hammer?

Usually, yes. Champion builds to industry-standard shank styles designed to fit the most common pneumatic hammers, which is exactly why our replacement steel drops into so many name-brand tools instead of only our own. On the pneumatic side that covers the familiar chipping-hammer and breaker shanks shared across major brands; on the electric side we publish dedicated fitment for specific tool families - for example Bosch, Hilti, and Kango style hammers, among others. The safest way to confirm is to identify your shank directly: pull the current bit and measure a hex shank across the flats or a round shank across its diameter, note the collar shape, and match it to the listings above. If you would rather just check, call with the make and model of your hammer and we will cross-reference it before you spend a dollar.

Order the right bit the first time

Put it all together and ordering is simple. Measure the shank, identify the collar, note the retainer, and choose your working end - point, chisel, spade - in that shank. Keep the tool oiled with SAE 10W-20 while you are at it, because a well-maintained retainer holds a bit better than a dry, worn one. Every Champion tool is rated at 90 PSI and backed by a 180-day warranty, and every chisel is made to standard shank dimensions so your next reorder fits just like the last. Start at the pneumatic chipping hammer steel hub or the whole air tool lineup.

Frequently Asked Questions

What size shank does a chipping hammer use?

Most pneumatic chipping hammers use one of two shank styles: a .580-inch hex shank or a .680-inch round shank. Champion stocks chisels in both, each available with a round collar or an oval collar to match your tool's retainer. Heavier air tools such as pavement breakers and rivet busters use larger hex or jumbo shanks instead.

What is the difference between an oval collar and a round collar?

The collar is the raised ring near the top of the shank that the retainer grabs to hold the chisel in the tool. A round collar and an oval collar simply match different retainer styles, so the collar has to match the retainer on your hammer. Champion offers .580 hex and .680 round chisels in both round-collar and oval-collar versions, plus quick-change retainers.

How do I know which shank my air hammer takes?

Pull the current bit and measure the shank: measure a hex shank across the flats and a round shank across its diameter, then note the shape of the collar and the retainer style. A .580 hex measures about .580 inch across the flats; a .680 round measures about .680 inch in diameter. If you know the make and model of the hammer, that identifies the shank too - Champion can cross-reference most common brands.

Will Champion chisels fit my Chicago Pneumatic or Ingersoll Rand hammer?

In most cases, yes. Champion builds its chisels to industry-standard shank styles designed to fit the most common pneumatic hammers, including tools from major brands. Match the shank size, collar, and retainer to your hammer, and if you are unsure, call with the make and model and we will confirm the right part before you order.

Champion Chisel Works, Inc. - family-owned and American-made in Rock Falls, Illinois since 1968. Tough Jobs. Tough Tools. One Source.