Robertson Screwdrivers | McMaster-Carr

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Drive Style

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External 8-Point

External Square

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For Bit Hex Shank Size

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Less than 250 in·lbf

Less than 25 N-m

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Less than 1,000 in·lbf

1,000 in·lbf to 1,999 in·lbf

2,000 in·lbf to 9,999 in·lbf

Less than 100 N-m

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DFARS Specialty Metals

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334 Products

Fastening and Joining

Screwdrivers

Tighten and loosen screws

Screwdriver/Nutdrivers

Screwdriver/Nutdrivers

Quickly switch between driving screws and driving nuts

Screwdriver Bits

Screwdriver Bits

Pair with drivers to turn screws

Screw Starters

Grip and start turning screws that are too small to hold or located in hard-to-reach spots

Ratchet Wrench/Screwdrivers

Ratchet Wrench/Screwdrivers

Switch between sockets and bits to turn a variety of fasteners with a single tool

Sockets

Turn fasteners with an external drive style without slipping and damaging the drive

Wrench Heads

Attach to your ratchet wrench and socket extension to turn fasteners where clearance is limited

Bit Sockets

Turn fasteners with an internal drive style without slipping and damaging the drive

Torque Wrenches

Torque Wrenches

Avoid overtightening and damaging fasteners by applying a specific torque

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)