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

Product ID: 78118455

Details

Brand
Bosch
Compatible devices
Drilling
Item diameter
0.5 Inches
Item weight
0.01 Ounces
Material
Alloy Steel

🔩1/2-inch capacity for versatile drilling

⚙️Keyless ratcheting for quick bit changes

🛠️Steel metal sleeve ensures rugged durability

20109 som

Duties & taxes included

In stock

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Description

🔧 Unlock your drill’s full potential with Bosch’s keyless power!

BUILT TO LAST - Durable steel sleeve withstands tough jobsite conditions—reliability you can trust.
EFFORTLESS BIT CHANGES - Keyless ratcheting locks drill bits instantly—save time, stay in flow.
UNIVERSAL COMPATIBILITY - Fits all Bosch and SDS-plus rotary hammers—no brand limits, no hassle.
DRILL ONLY MODE EXCLUSIVE - Designed specifically for drill-only mode on SDS-plus hammers—engineered for peak performance.
PRECISION MASONRY DRILLING - Optimized for rotation drilling in brick, block, and masonry—get the job done right.

The BOSCH 3-Jaw Keyless Chuck (HA3JAW) is a robust, 1/2-inch capacity drill chuck designed for SDS-plus rotary hammers. Featuring a durable steel sleeve and keyless ratcheting mechanism, it enables quick, secure bit changes and universal compatibility with Bosch and competitive brands. Ideal for precise masonry drilling in drill-only mode, this chuck combines rugged durability with efficient performance for professional-grade results.

Specifications

ASIN	B0062ICGEM
Best Sellers Rank	50,186 in DIY & Tools ( See Top 100 in DIY & Tools ) 64 in Chucks
Brand	Bosch
Capacity	0.5 inches
Compatible Devices	Drilling Machine
Country of Origin	China
Customer Reviews	4.4 4.4 out of 5 stars (1,953)
Global Trade Identification Number	00000346393200
Handle Type	keyed
Included Components	Unit^Instruction Guide
Item Diameter	0.5 Inches
Item Type Name	Drill Chuck
Item Weight	0.01 Ounces
Lock Type	keyless
Manufacturer	Bosch
Material	Alloy Steel
Model Number	HA3JAW
Number of Items	1
Part Number	HA3JAW
UPC	000346393200
Unit Count	1.0 count

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