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: 388659373

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

🛠️Durable steel metal sleeve for rugged use

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Description

🔧 Unlock your drill’s full potential with Bosch’s powerhouse chuck!

BUILT TO LAST - Steel alloy sleeve engineered for maximum durability—work hard, chuck harder.
DRILL ONLY MODE READY - Designed exclusively for drill-only mode on SDS-plus hammers—streamlined performance.
EFFORTLESS BIT CHANGES - Keyless ratcheting locks drill bits instantly—cut downtime, boost productivity.
UNIVERSAL COMPATIBILITY - Fits all Bosch & SDS-plus rotary hammers—never worry about brand limits.
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 alloy sleeve and keyless ratcheting mechanism, it enables fast, secure bit changes and is optimized for masonry drilling. Compatible with Bosch and competitive brands, it’s engineered for drill-only mode use, delivering reliable performance for professionals demanding efficiency and longevity.

Specifications

ASIN	B0062ICGEM
Best Sellers Rank	#80,967 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #120 in Power Drill Chucks
Brand	BOSCH
Brand Name	BOSCH
Capacity	0.5 inches
Compatible Devices	Drilling Machine
Compatible devices	Drilling Machine
Customer Reviews	4.4 out of 5 stars 1,955 Reviews
Global Trade Identification Number	00000346393200
Handle Type	D-shaped, straight
Included Components	Unit^Instruction Guide
Item Diameter	0.5 Inches
Item Type Name	Drill Chuck
Item Weight	0.01 Ounces
Item diameter	0.5 Inches
Item weight	0.01 Ounces
Lock Type	Automatic
Manufacturer	Bosch
Manufacturer Part Number	HA3JAW
Material	Alloy Steel
Material Type	Alloy Steel
Model Number	HA3JAW
Number of Items	1
Thread Size	M12
Thread size	M12
UPC	000346393200
Unit Count	1 Count

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S$89

Duties & taxes included

In stock

Sold byAmazon SINGAPOREDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to SINGAPORE.

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TrustScore 4.5 | 7,300+ reviews

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