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Phone: 800-383-2244, 805-584-9495   Fax: 805-584-9629 Helical Back Rake (HB135-HB480L) Boring Bars Click Here to open the tech drawing in a new window.  = Available For Shipment  = Call For Stock UNCOATED ORDER NO. COATED ORDER NO. OVERALL LENGTH 'A' MIN. HOLE SHANK DIA. HB135 HB135A 1.25 .135 0.109 HB150 HB150A 1.25 .150 0.125 HB150L HB150LA 2.25 .150 0.125 HB180 HB180A 1.25 .180 0.156 HB180L HB180LA 1.50 .180 0.156 HB180EL HB180ELA 3.00 .180 0.156 HB210 HB210A 1.50 .210 0.187 HB210L HB210LA 3.00 .210 0.187 HB240 HB240A 1.50 .240 0.218 HB240L HB240LA 3.00 .240 0.218 HB300 HB300A 2.50 .300 0.250 HB300L HB300LA 3.50 .300 0.250 HB360 HB360A 3.00 .360 0.312 HB360L HB360LA 4.25 .360 0.312 HB480 HB480A 3.00 .480 0.437 HB480L HB480LA 5.25 .480 0.437 ALL TOOLS ARE MADE FROM HIGHLY COMPRESSED SUB-MICRON CARBIDE. Copyright © 2002, Scientific Cutting Tools, Inc. Designed & Maintained by Daniel Milner