--- --- APWORKSHOP.COM.AU REPLACEABLE INSERT BITS FLUSH TRIMMING Part # Description D mm D inch B mm B inch L mm L inch d mm d inch Insert A$ R 1912 B REPLACEABLE FLUSH TRIM W/BRG 1/4 19 .747 12 .472 57 2.240 6.35 1/4 F 73.70 R 1912 B 1/2 REPLACEABLE FLUSH TRIM W/BRG 1/2 19 .747 12 .472 65 2.555 12.7 1/2 F 73.70 R 1930 B 1/2 REPLACEABLE FLUSH TRIM W/BRG 1/2 19 .747 30 1.179 82 3.227 12.7 1/2 B 107.80 R 1940 B 1/2 REPLACEABLE FLUSH TRIM W/BRG 1/2 19 .747 40 1.572 93 3.655 12.7 1/2 C 111.10 R 1950 B 1/2 REPLACEABLE FLUSH TRIM W/BRG 1/2 19 .747 50 1.965 100 3.93 12.7 1/2 E 129.80 PART CODES: B= Ball Bearing Guide, BB= Double Ball Bearing Guide, E/C = End Cutting, S = Single Flute, 1/2= 1/2 inch (12.7 mm) shank diameter, 16= 16 mm shank diameter (if no suffix then shank is 6.35mm = 1/4 inch). DESCRIPTION ABBREVIATIONS: W/BRG= With bearing, D/BRG= Double bearing ![]()
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Router Bits
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R 1912 B & R 1912 B 1/21, 2 & 3-HOLE INSERT BLADE
TWO FLUTES WITH BALL BEARING GUIDE TB 5
Shank: 1/2 inch (12.7 mm) is shown in the part number, otherwise is 1/4 inch (6.35 mm )

Note- see Insert Blades page for details about the Inserts for these bits 
R 1930 B 1/2 & R 1940 B 1/2 
R 1950 B 1/2