Can this be used for hammering (chisel), rotory hammering (bit)? Using regular bits and chisels,

I can't speak for the keyless version of the Bosch 1/2" chuck adapter. But I have the keyed version of Bosch's 1/2" chuck adapter! The keyed version, employs a a special chuck body with a sliding shank, that (like an SDS chuck,) transmits the percussive energy directly into the back of whatever tool or bit is installed in the Jacobs chuck. I used my adapter to fit a 30" x 1-3/4 bulb auger, into Dewalt's 18volt SDS+ roto hammer. Then used this combination, for several days, in the rotor hammer mode, without a failure. (A roto hammer fitted with a bulb auger, is my tool of choice when the task is the extrication of woody shrubs, and their gordian root systems!)

Which is better, Bosch key or keyless construction?

Keyless is better specially if you start drill and forget key is still in the chuck

Is the SDS Shank removable? Does the chuck loosen when operating in the opposite direction or is there a flat spot to lock the chuck on the shank?

Yes, it locks in place just like a bit would. Works great, I used it to mix mortar for 2K feet of floor tile.

How do you lock it into position so that it is not moving up and down?

Thank you for your question. The HA3JAW adapter works the same way the SDS-Plus bits work. They lock into place in the chuck. If you have further questions please feel free to contact our Bosch Customer Service Representatives at 1-877-BOSCH-99 (1-877-267-2499).

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🔧 Unlock your drill’s full potential—fast, tough, and ready for anything!

RUGGED DURABILITY - Steel metal sleeve engineered to withstand the toughest jobsite conditions
COMPACT LIGHTWEIGHT - Sleek 0.28g design ensures easy handling without sacrificing strength
EFFORTLESS BIT CHANGES - Keyless ratcheting mechanism locks drill bits instantly—no fumbling, no downtime
UNIVERSAL COMPATIBILITY - Fits all Bosch & SDS-plus rotary hammers for seamless tool integration
PRECISION MASONRY DRILLING - Optimized for rotation drilling in brick, block, and masonry with unmatched stability

The BOSCH 3-Jaw Keyless Chuck HA3JAW is a 1/2-inch capacity, SDS-plus compatible drill accessory designed for professional-grade masonry drilling. Featuring a durable steel sleeve and a keyless ratcheting system, it enables quick bit changes and fits all Bosch and competitive SDS-plus rotary hammers, making it an essential upgrade for efficient, heavy-duty drilling tasks.

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Thread size	M12
Capacity	0.5 Inches
Included components	Unit^Instruction Guide
Global Trade Identification Number	00000346393200
Manufacturer	Bosch
UPC	000346393200
Part number	HA3JAW
Item Weight	0.28 g
Product Dimensions	18.54 x 5.84 x 4.06 cm; 0.28 g
Item model number	HA3JAW
Size	1/2-inch
Color	Standart
Style	SDS Plus to 3 Jaw Chuck
Power source type	Hand Powered
Voltage	120
Item Package Quantity	1
Cutting Diameter	0.5 Inches
Batteries Included?	No
Batteries Required?	No

BOSCH 3-Jaw Keyless Chuck with SDS-Plus Shank, 1/2-Inch HA3JAW

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