Robertson Drivers | McMaster-Carr

	For Drive Style For Drive Style


Square	Phillips	Slotted

Torx	Hex	Pozidriv®

Tamper- Resistant Square	External Hex	Clutch

Double Square	Drilled Spanner	Tamper- Resistant Hex

Tamper- Resistant Torx	Torq- Set®	Tri-Wing®

Square Phillips	Triple Square

	Driver Style Driver Style


Bit	Driver

	System of Measurement System of Measurement

Inch

Metric

in.-lbs.

	Size Size

	Individual/Set Individual/Set

Individual

Set

	Overall Length Overall Length

	Shank Type Shank Type

Quick-Change Hex

Hex

Reversible Hex

	Tip Style Tip Style


Standard	Ball

	Number of Pieces Number of Pieces

	Hex Shank Size Hex Shank Size

1/4"

5/16"

	For Screw Size For Screw Size

	Grip Style Grip Style


Ultra Grip	Plain

Cushion

	Material Material

Steel

Stainless Steel

	For Bit Hex Shank Size For Bit Hex Shank Size

1/4"

5/16"

	Driver Type Driver Type

Standard

Torque

	Container Type Container Type

	Maximum Torque Maximum Torque

36 in.-lbs.

4 Nm

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Minimum Torque Minimum Torque

2 in.-lbs.

0.2 Nm

	Bit-Holding Mechanism Bit-Holding Mechanism

Ball Detent

Magnet

	Number of Sizes Number of Sizes

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122 Products

Screwdriver Bits

Square Bits

Strong and durable, these multipurpose bits are for use with bit screwdrivers. They're designed for screws with a square recess in the head and are also known as Robertson bits.

Square Bits for Impact Drivers

The toughest bits available, these withstand the shock and twisting force of impact drivers. Designed for screws with a square recess in the head, they are also known as Robertson bits.

Square Bits for Stainless Steel Screws

Protect your stainless steel screws by using a stainless steel bit. If steel flakes off a standard bit and into the recess, it can lead to rust and contamination. These bits eliminate that risk.

Reversible Square Bits

Bits have a different size at each end.

Depth-Limiting Square Bits

An exterior stop collar prevents fasteners from being driven too deep. Use with soft materials such as drywall, wood, and fiberboard.

Tamper-Resistant Square Bits

An opening at the tip accommodates the pin in the recess of tamper-resistant square screws.

Double Square Bits

The tip is shaped like an eight-pointed star.

Square Phillips Bits

While screws with a square/Phillips combination drive can be turned with either a square or Phillips bit, these make the best contact so you can apply high torque without slipping and stripping the recess. They are also known as Quadrex bits.

Triple Square Bits

These bits are shaped like a 12-pointed star. They're also known as XZN bits.

Bit Sets

Square Bit Sets

Also known as Robertson bits these are designed for screws with a square recess in the head.

Bit Assortments

Assortments contain bits with multiple drive styles.

Screwdrivers

Ultra-Grip Screwdrivers

These screwdrivers have a soft, contoured handle that provides comfort and the best possible grip for achieving maximum torque.

Ultra-Grip Screwdriver Sets

Sets include an assortment of drivers with soft, contoured handles that provide comfort and the best possible grip for achieving maximum torque.

Ball-End Screwdriver Sets

The assorted drivers in these sets have a ball end that allows angled entry to turn screws in hard-to-reach areas.

Ball-End Screwdrivers

When you don't have exact alignment between the fastener and the tool, the ball end allows angled entry to turn screws in hard-to-reach areas.

Electrical-Insulating Screwdriver Sets

Sets include assorted drivers with an insulated handle and shaft that protect against shock from accidental contact with live electrical circuits. They are tested to 1,000 volts to meet IEC, EN, or ASTM standards.

Electrical-Insulating Screwdrivers

An insulated handle and shaft protect against shock from accidental contact with live electrical circuits. These tools are tested to 1,000 volts to meet IEC, EN, or ASTM standards.

Screwdrivers for Stainless Steel Screws

Protect your stainless steel screws by using a stainless steel driver. If steel flakes off a standard tool and into the recess, it can lead to rust and contamination. These drivers eliminate that risk.

Reversible-Bit Screwdriver/Nutdrivers

Bits have a different tip at each end and snap into the shaft, which is also a nutdriver.

Ratcheting Bit Screwdrivers

A ratchet mechanism turns fasteners more quickly than a standard bit driver. Insert a bit into the shaft and a magnet holds it in place.

Adjustable-Length Screwdriver Sets

Press down on the handle’s collar to either adjust the shaft length or remove the shaft and replace it for a different tip. Sets include a handle and multiple reversible shafts.

Torque Screwdriver and Bit Sets

These sets include an adjustable torque driver, bits for different drive styles, and a socket adapter.

Tight-Clearance Screw Starters

The slim body reaches into tight spots to grip and turn screws that are hard to reach or too small to hold by hand.