COUNTERBORES 144 High Speed Steel Counterbores for Fillister Head Machine Screws List No. 502 – Two Flute, Straight Shank Sets Sizes Description Pieces Set No. Price No.2, No.4, No.6, No.8, No.10 Number Set 5 502SA 56.74 1/4, 5/16, 3/8, 1/2 Fractional Set 4 502SB 98.91 All sets are supplied in wood block Screw Size Pilot Diameter Cutting Diameter Shank Diameter Overall Length Price Each No.0 .059 .110 .109 2-1/2 11.43 No.1 .072 .133 .109 2-1/2 11.43 No.2 .085 .155 3/16 2-1/2 10.07 No.3 .098 .176 3/16 2-1/2 10.07 No.4 .111 .198 1/4 2-5/8 10.07 No.5 .124 .220 1/4 2-5/8 10.98 No.6 .137 .241 1/4 2-5/8 11.43 No.8 .163 .285 5/16 2-3/4 12.15 Screw Size Pilot Diameter Cutting Diameter Shank Diameter Overall Length Price Each No.10 .189 .328 3/8 2-7/8 13.05 No.12 .215 .372 3/8 3 14.58 1/4 1/4 13/32 5/16 3-5/8 21.06 5/16 5/16 15/32 3/8 4 21.96 3/8 3/8 19/32 7/16 4-3/8 25.11 7/16 7/16 21/32 1/2 4-3/4 28.35 1/2 1/2 25/32 9/16 5-1/4 30.78 5/8 5/8 .882 5/8 5-1/2 45.00 Price Each Price Each Screw Size Pilot Diameter Cutting Diameter Shank Diameter Overall Length Straight Shank 508 Morse Taper Number Taper Shank 509 No.5 .141 .221 3/16 3 17.55 –– –– No.6 .150 .242 7/32 3 17.55 –– –– No.8 11/64 19/64 1/4 3 17.55 –– –– No.10 13/64 21/64 5/16 3-1/2 18.90 –– –– 1/4 9/32 13/32 3/8 5 21.15 2 22.05 5/16 11/32 1/2 7/16 5 23.09 2 24.21 3/8 13/32 19/32 1/2 6 26.37 2 28.80 7/16 15/32 11/16 1/2 7 31.52 2 34.11 1/2 17/32 25/32 1/2 7-1/2 35.91 2 37.80 1/2 17/32 25/32 3/4 7-1/2 35.91 –– –– 1/2 9/16 13/16 3/4 7-1/2 35.91 –– –– 5/8 21/32 31/32 3/4 7-1/2 51.63 2 53.55 5/8 11/16 1 3/4 7-1/2 51.63 2 53.55 3/4 13/16 1-3/16 1 8 73.10 3 76.50 7/8 15/16 1-3/8 1 8 109.90 3 115.20 1 1-1/16 1-9/16 1 10 142.62 3 145.80 Price Each Price Each Screw Size (mm) Pilot Diameter (mm) Cutting Diameter (mm) Shank Diameter Overall Length Straight Shank 508M Morse Taper Number Taper Shank 509M 3.00 3.40 6.00 7/32 3 17.55 –– –– 4.00 4.50 8.00 5/16 3-1/2 17.55 –– –– 5.00 5.50 10.00 5/16 4-1/2 18.58 –– –– 6.00 6.60 11.00 1/2 5 21.15 –– –– 8.00 9.00 15.00 1/2 6 23.09 –– –– 10.00 11.00 18.00 1/2 7 26.37 –– –– 12.00 14.00 20.00 5/8 7-1/2 31.52 –– –– 14.00 15.00 24.00 3/4 8 35.91 2 39.90 16.00 17.00 26.00 1 9 51.63 2 51.63 20.00 21.00 33.00 1 10 73.10 2 73.10 Solid Pilot – High Speed Steel Cap Screw Counterbores List No. 508 – Straight Shank List No. 509 – Taper Shank List No. 508M – Three Flute, Straight Shank List No. 509M – Three Flute, #2 Morse Taper Shank Sets Metric Sizes Sizes Description Pcs. Set No. Price No.8, No.10, 1/4, 3/8 Straight Shank 4 508S4 87.77 No.6, No.8, No.10, 1/4, 5/16, 3/8, 1/2 Straight Shank 7 508S7 160.52 1/4, 5/16, 3/8, 1/2, 5/8, 3/4 Straight Shank 6 508S6 231.25 1/4, 5/16, 3/8, 1/2, 5/8, 3/4 Taper Shank 6 509S6 242.91 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm Metric, Straight Shank 7 508S7M 155.81 All sets are supplied in wood block
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