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Counterbores

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Used to countersink and counterbore for heads of screws in woods, plastics and non-ferrous materials. Heat-treated for long tool life.

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Four-blade rugged construction, these countersinks have shorter blades to reduce breakage and are designed to Countersink in metals and hardwoods. They are adjustable up and down on twist drills and held in place by two hex-socket set screws, which tighten into the flute of the drill.

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With extension lip pattern cutting edges, this Counterbore cuts a clean hole without tearing woods or plastics. Made of Stainless Steel, hardened enough to hold an edge and yet can be sharpened with a file. Type ‘R’ Counterbores can counterbore deep enough for a wood plug over the head of the screw or rivet. 

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Fuller Page 20 Countersinks · Counterbores · Tapered Drills · Plug Cutters · Step Drills · Stop Collars Over 45 years of quality, service and dependability from the Fuller Family Type K Countersinks and Type M Counterbores X = Not available Various combinations of K081258 mounted on 1/8" x 5-1/8" long drill Cutting diameters and shanks M0811258 mounted on 1/8" x 5-1/8" long drill Type K Countersinks and Type M Counterbores are both 3” overall length and designed for deep countersinking or counterboring. They can also be used with drill jig bushings. Available in both Carbon Steel and also Stainless Steel for cutting hardwoods indicated by adding “S” to the end of the stock number. See page 36 for explanation of steel types. Type ‘K’ Countersinks to cut wood and plastics 3” O.A. with 3/8” or 1/2” shanks. 82 degree included angle to cut in wood and plastics. Stock Numbers Standard “K” Type “KS” Type for Hard Woods Drill Hole Size 3/8” Shank 1/2” Shank 3/8” Shank 1/2” Shank 3/8” Cutting Diameter 1/8 K061256 K061258 KS061256 KS061258 9/64 K061406 K061408 KS061406 KS061408 5/32 K061566 K061568 KS061566 KS061568 11/64 K061716 K061718 KS061716 KS061718 3/16 K061876 K061878 KS061876 KS061878 13/64 K062036 K062038 KS062036 KS062038 7/32 K062186 K062188 KS062186 KS062188 7/16” Cutting Diameter 13/64 K072036 K072038 KS072036 KS072038 7/32 K072186 K072188 KS072186 KS072188 9/32 X K072818 KS072816 KS072818 1/2” Cutting Diameter 1/8 K081256 K081258 KS081256 KS081258 9/64 K081406 K081408 KS081406 KS081408 5/32 K081566 K081568 KS081566 KS081568 11/64 K081716 K081718 KS081716 KS081718 3/16 K081876 K081878 KS081876 KS081878 13/64 K082036 K082038 KS082036 KS082038 7/32 K082186 K082188 KS082186 KS082188 1/4 K082506 K082508 KS082506 KS082508 9/32 X K082818 KS082816 KS082818 5/16 X K083128 KS083126 KS083128 5/8” Cutting Diameter 1/4 K102506 K102508 X X 9/32 K102816 K102818 X X 5/16 K103126 K103128 X X 3/4” Cutting Diameter 1/4 K122506 K122508 X X 5/16 K123126 K123128 X X Special sizes priced on request. Type ‘M’ Counterbores to cut wood and plastics 3” O.A. with 3/8” or 1/2” shank to cut flat bottom hole in wood and plastics. Stock Numbers Standard “M” Type “MS” Type for Hard Woods Drill Hole Size 3/8” Shank 1/2” Shank 3/8” Shank 1/2” Shank 3/8” Cutting Diameter 1/8 M061256 M061258 MS061256 MS061258 9/64 M061406 M061408 MS061406 MS061408 5/32 M061566 M061568 MS061566 MS061568 11/64 M061716 M061718 MS061716 MS061718 3/16 M061876 M061878 MS061876 MS061878 13/64 M062036 M062038 MS062036 MS062038 7/32 M062186 M062188 MS062186 MS062188 7/16” Cutting Diameter 13/64 M072036 M072038 MS072036 MS072038 7/32 M072186 M072188 MS072186 MS072188 9/32 X M072818 MS072816 MS072818 1/2” Cutting Diameter 1/8 M081256 M081258 MS081256 MS081258 9/64 M081406 M081408 MS081406 MS081408 5/32 M081566 M081568 MS081566 MS081568 11/64 M081716 M081718 MS081716 MS081718 3/16 M081876 M081878 MS081876 MS081878 13/64 M082036 M082038 MS082036 MS082038 7/32 M082186 M082188 MS082186 MS082188 1/4 M082506 M082508 MS082506 MS082508 9/32 X M082818 MS082816 MS082818 5/16 X M083128 MS083126 MS083128 5/8” Cutting Diameter 1/4 M102506 M102508 X X 9/32 M102816 M102818 X X 5/16 M103126 M103128 X X 3/4” Cutting Diameter 1/4 M122506 M122508 X X 5/16 M123126 M123128 X X

Fuller Page 21 Countersinks · Counterbores · Tapered Drills · Plug Cutters · Step Drills · Stop Collars Over 45 years of quality, service and dependability from the Fuller Family Type ‘R’ Counterbores To cut flat bottom holes in wood or plastic for heads of screws, rivets or nails, two flutes. Stock Sizes Set of Type 'R' Counterbores in Wood Holder Stock No. 11890009 R93 With extension lip pattern cutting edges, this Counterbore cuts a clean hole without tearing woods or plastics. Made of Stainless Steel, hardened enough to hold an edge and yet can be sharpened with a file. Type ‘R’ Counterbores can counterbore deep enough for a wood plug over the head of the screw or rivet. See page 36 for explanation of steel types. Stock Number Cutting Diameter Drill Size R17 3/8 7/64 *R1 3/8 1/8 R19 3/8 9/64 R15 3/8 5/32 R111 3/8 11/64 R13 3/8 3/16 R113 3/8 13/64 *R72 7/16 1/8 *R75 7/16 5/32 R73 7/16 3/16 R713 7/16 13/64 *R22 1/2 1/8 *R25 1/2 5/32 R211 1/2 11/64 *R23 1/2 3/16 R213 1/2 13/64 *R27 1/2 7/32 *R215 1/2 15/64 *R24 1/2 1/4 R93 9/16 3/16 R97 9/16 7/32 R94 9/16 1/4 The following Drills and Stop Collars can be added to above set of Counterbores Type Drill Length Stock Number Ref. Page -Short Length 15090009 39 -Regular Length 15190009 40-42 High Speed Regular Point Drills -Long Length 15290009 43 -Short Length 20090009 39 -Regular Length 20190009 40-42 High Speed Brad Point Drills -Long Length 20290009 43 -Short Length 25090009 7 -Regular Length 25190009 7 High Speed Taper Point Drills -Long Length 25290009 7 Stop Collars to control depth - 11990009 6 * Indicates sizes in set of 9 Type 'R' Counterbores shown above. Substitutions of the same cutting diameter Counterbore may be made. All sizes 1" long overall Drills are not included unless specified. Types and sizes are shown on pages 39 - 54. Stop collars shown on page 6. Matching Plug Cutters shown on page 10. Special sizes - Quotation on request. WARNING Cutting tools may shatter when broken. The wearing of eye protection is strongly advised in the vicinity of their use. R24 mounted on 1/4” regular length drill Fuller Page 22 Countersinks · Counterbores · Tapered Drills · Plug Cutters · Step Drills · Stop Collars Over 45 years of quality, service and dependability from the Fuller Family Type ‘B’ and Type ‘X’ Counterbores To cut wood and plastic, four flutes. B34 X34L Type 'B' Counterbores Designed to cut clean holes in softwood. Can also be used with stop collars (shown on page 6) to control depth of cut. Counterbores for the flat under the head of nails, spikes and bolts to sink the heads under the surface or deep enough for wood plug to cover the head. Can be set at any point on twist drill and held fast with two hex-socket set screws. Designed for clean cutting and hardened for long life. Can be used in Drill Press, Electric Hand Drill or Bit Brace. Sizes and types of drills available to fit Type ‘B’ Counterbores are shown on pages 39 thru 54. Stop Collars to control depth are shown on page 6. Type 'B' Type 'X' Specifications Stock Number Stock Number Cutting Dia. Overall Length Drill Size *B3 *X3L 5/8 1 3/16 B37 X37L 5/8 1 7/32 B34 X34L 5/8 1 1/4 B317 X317L 5/8 1 17/64 B39 X39L 5/8 1 9/32 B310 X310L 5/8 1-1/8 5/16 B43 X43L 3/4 1 3/16 B47 X47L 3/4 1 7/32 *B4 *X4L 3/4 1 1/4 B49 X49L 3/4 1 9/32 *B5 *X5L 3/4 1-1/8 5/16 B511 X511L 3/4 1-1/8 11/32 B56 X56L 3/4 1-1/4 3/8 B64 X64L 7/8 1-1/8 1/4 B610 X610L 7/8 1-1/8 5/16 *B6 *X6L 7/8 1-1/4 3/8 B67 X67L 7/8 1-3/8 7/16 B68 X68L 7/8 1-1/2 1/2 B74 X74L 1 1-1/8 1/4 B75 X75L 1 1-1/8 5/16 B76 X76L 1 1-1/4 3/8 *B7 *X7L 1 1-3/8 7/16 B78 X78L 1 1-1/2 1/2 B85 X85L 1-1/8 1-1/8 5/16 B86 X86L 1-1/8 1-1/4 3/8 B87 X87L 1-1/8 1-3/8 7/16 *B8 *X8L 1-1/8 1-1/2 1/2 B89 X89L 1-1/8 1-5/8 9/16 B96 X96L 1-1/4 1-1/4 3/8 B97 X97L 1-1/4 1-3/8 7/16 B98 X98L 1-1/4 1-1/2 1/2 B9 X9L 1-1/4 1-5/8 9/16 B910 X910L 1-1/4 2 5/8 B912 X912L 1-1/4 2-1/4 3/4 B106 X106L 1-3/8 1-3/8 3/8 B107 X107L 1-3/8 1-3/8 7/16 B108 X108L 1-3/8 1-1/2 1/2 B109 X109L 1-3/8 1-5/8 9/16 B10 X10L 1-3/8 2 5/8 B1012 X1012L 1-3/8 2-1/4 3/4 B126 X126L 1-1/2 1-1/2 3/8 B127 X127L 1-1/2 1-1/2 7/16 B128 X128L 1-1/2 1-1/2 1/2 B129 X129L 1-1/2 1-5/8 9/16 B1210 X1210L 1-1/2 2 5/8 B12 X12L 1-1/2 2-1/4 3/4 Type ‘X’ Counterbores Designed to cut faster and deeper in hardwoods. Adaptable to high or low speed spindles and hardened for long service. Four-blade rugged construction cuts a smooth hole and stays sharp longer. Sizes and types of drills available to fit type ‘X’ Counterbores are shown on pages 39 thru 54. Stop Collars not recommended on type ‘X’ Counterbores. Types ‘B’ and ‘X’ Counterbores Special sizes - Quotation on request. * Indicates the sizes in set of Type ‘B’ or ‘X’ Counterbores shown on page 23. Substitutions with the same cutting diameter Counterbore may be made if desired. Quotation on request. WARNING Cutting tools may shatter when broken. The wearing of eye protection is strongly advised in the vicinity of their use. B34 mounted on 1/4” Brad Point Drill with 5/8” Stop Collar Fuller Page 23 Countersinks · Counterbores · Tapered Drills · Plug Cutters · Step Drills · Stop Collars Over 45 years of quality, service and dependability from the Fuller Family ‘X’ and ‘B’ Counterbore Sets Set of 6 Type ‘B’ Counterbores in Wood Holder Stock No. 10290006 Set of 6 Type ‘X’ Counterbores In Wood Holder Stock No. 12490006 The following sets of Drills and Stop Collars can be ordered with the above sets of Counterbores Drill Type Length Stock Number Page Reference -Short Length 15090006 39 -Regular Length 15190006 40-42 High Speed Regular Point drills -Long Length 15290006 43 -Short Length 25090006 39 -Regular Length 25190006 40-42 High Speed Brad Point Drills -Long Length 25290006 43 Stop Collars to control depth (Type B only) 11990006 6

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