Machinery's Handbook, 31st Edition
842 INDEXABLE INSERTS insert in the pocket. Most standard indexable insert holders are either straight-shank or offset-shank, although special holders are made having a wide variety of configurations. The common shank sizes of indexable insert tool holders are shown in Table 1. Not all styles are available in every shank size. Positive- and negative-rake tools are also not available in every style or shank size. Some manufacturers provide additional shank sizes for certain tool holder styles. For more complete details, the manufacturers’ catalogs must be consulted. Table 1. Standard Shank Sizes for Indexable Insert Holders
B
A
C
Shank Dimensions for Indexable Insert Holders
Basic Shank Size
A
B
C a
inch
mm
inch
mm
inch 4.500 4.500 6.000 4.500 6.000 6.000 6.000 6.000 6.000 7.000 8.000 6.380 7.000 9.500 8.000
mm
0.500 0.625 0.625 0.750 0.750 0.750 1.000 1.000 1.000 1.250 1.250 1.375 1.500 1.750 2.000
12.70 15.87 15.87 19.05 19.05 19.05 25.40 25.40 25.40 31.75 31.75 34.92 38.10 44.45 50.80
0.500 0.625 1.250 0.750 1.000 1.250 1.000 1.250 1.500 1.250 1.500 2.062 1.500 1.750 2.000
12.70 15.87 31.75 19.05 25.40 31.75 25.40 31.75 38.10 31.75 38.10 52.37 38.10 44.45 50.80
114.30 114.30 152.40 114.30 152.40 152.40 152.40 152.40 152.40 177.80 203.20 162.05 177.80 241.30
1 ⁄ 2 × 1 ⁄ 2 × 4 1 ⁄ 2 5 ⁄ 8 × 5 ⁄ 8 × 4 1 ⁄ 2 5 ⁄ 8 × 1 1 ⁄ 4 × 6 3 ⁄ 4 × 3 ⁄ 4 × 4 1 ⁄ 2 3 ⁄ 4 × 1 × 6 3 ⁄ 4 × 1 1 ⁄ 4 × 6 1 × 1 × 6 1 × 1 1 ⁄ 4 × 6 1 × 1 1 ⁄ 2 × 6 1 1 ⁄ 4 × 1 1 ⁄ 4 × 7
1 1 ⁄ 4 × 1 1 ⁄ 2 × 8 1 3 ⁄ 8 × 2 1 ⁄ 16 × 6 3 ⁄ 8 1 1 ⁄ 2 × 1 1 ⁄ 2 × 7 1 3 ⁄ 4 × 1 3 ⁄ 4 × 9 1 ⁄ 2
2 × 2 × 8 203.20 a Holder length; may vary by manufacturer. Actual shank length depends on holder style. Identification System for Indexable Insert Holders.— The following identification sys- tem conforms to the American National Standard, ANSI B212.5-2002, Metric Holders for Indexable Inserts. Each position in the system designates a feature of the holder in the following sequence: 1 2 3 4 5 — 6 — 7 — 8 a — 9 — 10 a C T N A R — 85 — 25 — D — 16 — Q 1) Method of Holding Horizontally Mounted Insert: The method of holding or clamping is designated by a letter: C, top clamping, insert without hole; M, top and hole clamping, insert with hole; P, hole clamping, insert with hole; S, screw clamping through hole, insert with hole; W, wedge clamping. 2) Insert Shape: The insert shape is identified by a letter: H, hexagonal; O, octagonal; P, pentagonal; S, square; T, triangular; C, rhombic, 80 ° included angle; D, rhombic, 55 ° included angle; E, rhombic, 75 ° included angle; M, rhombic, 86 ° included angle; V, rhom bic, 35 ° included angle; W, hexagonal, 80 ° included angle; L, rectangular; A, parallelo gram, 85 ° included angle; B, parallelogram, 82 ° included angle; K, parallelogram, 55 ° included angle; R, round. The included angle is always the smaller angle. 3) Holder Style: The holder style designates the shank style and the side cutting edge angle, or end cutting edge angle, or the purpose for which the holder is used. It is designated
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