The BOSCH HA3JAW 1/2 In. Keyless 3-Jaw Chuck with SDS-Plus Shank for Use with Straight Shank Drill Bits is an accessory that converts an SDS-plus rotary hammer into a tool that can hold standard straight shank drill bits. This is a drill chuck designed for rotation drilling with straight shank bits on SDS-plus rotary hammers. Model Number: HA3JAW. If you already own an SDS-plus hammer and need more flexibility for general drilling, this is the add-on that makes that happen.

The big advantage here is versatility. Instead of being limited to SDS-plus bits, you can clamp in regular drill bits up to 1/2 inch capacity. That makes this Bosch chuck useful for jobs where a rotary hammer is already on site, but the task calls for standard twist bits or other straight shank accessories. Bosch specifically positions it for use on masonry, brick, and block when the tool is set to drill-only rotation mode.

The chuck itself uses a keyless three-jaw design, which means faster bit changes and no chuck key to lose. The ratcheting action helps lock bits down securely with hand tightening, so you can move from one bit to another without slowing down. On work that mixes hole sizes or materials, that saves time in a way you notice right away.

Bosch also built this accessory with a steel metal sleeve for rugged durability. That matters because a chuck adapter like this gets handled, swapped, and knocked around more than people think. The tougher outer sleeve gives you a solid grip while tightening and holds up better than lighter-duty designs when it lives in a tool bag or job box.

Where this accessory needs to be used correctly is mode selection. Bosch states that the HA3JAW is for drill-only mode or rotation mode only on SDS-plus rotary hammers. It is not the right setup for hammer drilling or impact-style use. Used as intended, it expands what your SDS-plus hammer can do. Used in the wrong mode, you are asking a chuck adapter to do a job it was not built for.

Compatibility is another strong point. Bosch says this three-jaw chuck is built for use with all Bosch and competitive brand SDS-plus hammers. The SDS-plus shank gives you a familiar interface for rotary hammers that accept SDS-plus accessories, while the chuck side accepts straight shank drill bits. That makes it a practical bridge between an SDS-plus platform and common drilling accessories already in your kit.

This accessory makes the most sense for tradespeople and serious DIY users who already own an SDS-plus rotary hammer and want to stretch that tool further. Remodelers, general contractors, maintenance crews, and anyone drilling a mix of masonry and standard materials can get more use from the same tool. If you want one dedicated solution for pure hammer drilling, stick with SDS-plus bits. If you want your rotary hammer to handle more everyday drilling tasks, the HA3JAW is the kind of accessory that earns its keep.

BOSCH HA3JAW 1/2 In. Keyless 3-Jaw Chuck with SDS-Plus Shank for Use with Straight Shank Drill Bits is a smart add-on for guys who want more from their rotary hammer

This is the kind of accessory that makes an SDS-plus hammer a lot more useful when the job shifts from dedicated hammer drilling to standard drilling with straight shank bits.

• Who it's for: Anyone who already owns an SDS-plus rotary hammer and wants to use regular drill bits for general drilling tasks.
• Why it stands out: You get a 1/2 inch keyless three-jaw chuck, SDS-plus fit, and a steel sleeve in one simple adapter.
• Worth knowing: This is a drill-only accessory. If you need hammer mode, go back to the proper SDS-plus bit setup.

• What type of tool does this fit? It is designed for SDS-plus rotary hammers, including Bosch and competitive brand SDS-plus hammers.
• What kind of bits does it hold? It holds straight shank drill bits in a keyless 3-jaw chuck.
• What is the chuck capacity? The chuck capacity is 1/2 inch.
• Can this be used in hammer mode? No. Bosch states it should be used only in drill-only or rotation-only mode.