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 | | Robertson is famous for the patent of the socket-head screw, widely known today as the square recess. The Robertson system perfectly mates the taper drive bit tip to the square recess punched in the screw. The result is a very precise fit: no cam-out, no slippage in the drive. The drive style manufactured today is known as Recex™ – a combination of Phillips and Robertson drives, allowing convenient use of either drive type. Often considered the woodworker's screw of choice, Robertson screws are commonly used by furniture manufacturers, cabinetmakers and tradespeople.
These color-coded drive bits are essential when using genuine Robertson screws. They have a shock-resistant steel tip insert that seats firmly in the drive and will not cam out. Each bit is identified by a powder-coated color particular to the Robertson drive size. This is a common standard reference.
All have 1/4" hex shanks.
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Robertson® #
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Bit Color
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Bit Length
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Screw Size
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1+
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5+
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19J40.01
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#0
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Yellow
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1"
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#2,4
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$1.20
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$1.00
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19J40.11
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#1
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Green
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1"
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#5,6,7
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$1.20
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$1.00
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19J40.12
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#1
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Green
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2"
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#5,6,7
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$1.30
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$1.10
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19J40.14
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#1
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Green
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4"
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#5,6,7
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$1.60
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$1.35
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19J40.21
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#2
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Red
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1"
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#8,9,10
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$1.20
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$1.00
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19J40.22
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#2
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Red
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2"
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#8,9,10
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$1.30
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$1.10
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19J40.24
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#2
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Red
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4"
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#8,9,10
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$1.60
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$1.35
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19J40.26
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#2
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Red
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6"
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#8,9,10
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$2.10
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$1.80
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19J40.31
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#3
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Black
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1"
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#12,14
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$1.20
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$1.00
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19J40.32
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#3
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Black
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2"
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#12,14
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$1.30
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$1.10
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19J40.34
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#3
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Black
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4"
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#12,14
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$1.60
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$1.35
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19J40.36
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#3
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Black
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6"
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#12,14
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$2.10
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$1.80
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