Tool SOLID PILOT COUNTERBORE .5946 INCH X .2487” 19/32 X 1/4" 3/8 SHANK 4 3/16 OAL

FOR 1/4 CAP SCREW CLOSE FIT WITH WASHER TYPE B SERIES N .500 OUTSIDE DIAMETER

SOLID PILOTED COUNTERBORE 2-FLUTE BORE STYLE 19/32 X 1/4" HSS HIGH SPEED STEEL 2 OZ

COUNTERBORE BORE STYLE .5946" DIA. 19/32 INCH X 1/2" LONG

PILOT .2487” DIA. X 11/16” LONG

SHANK 3/8” DIA. X 2 7/8” LONG

PRATT & WHITNEY P & W HFD. CT U.S.A.

HS 36   5937   F 5

C’BORE LOOKS GOOD WITH SOME WEAR

                page 1202-1203 1980 Machinery’s Handbook

                + NEEDS TO BE ~ .002 LARGER; + NEEDS TO BE ~ .005 LARGER.

# x .013 + .060 =                                                                   NORMAL FIT                       CLOSE FIT       DIA. WASHER

SCREW                 MAX HEAD      COUNTERBORE           PILOT DRILL      SCREW    PILOT DRILL     A1A ,A1B or B

4             .112       .183        3/16      .219       7/32                      9/64      .136        4             .125     1/4         .312  .250

5             .125       .205       13/64+   .250        ¼                         5/32     .154         5             .141     9/64       .281  .406

6             .138       .226       7/32+     .272      17/64+                 11/64     .170         6             .154      23         .375  .312

8             .164       .270       17/64+   .316       5/16+                   3/16+    .194         8             .180     15          .438  .375

10           .190       .312        5/16      .359       23/64                    7/32+   .221        10             .206      5          .500  .406

¼            .250       .375        3/8        .422       27/64                    9/32     .281         ¼             .266    17/64     .625  .500

5/16        .312       .469       15/32     .515       33/64                   11/32    .344        5/16          .328    21/64     .688  .625  

3/8          .375       .562        9/16      .609       39/64                   13/32    .406        3/8            .391    25/64     .812  .734

7/16        .437       .656       21/32     .703       45/64                   15/32    .469        7/16          .453    29/64     .922  .875

½            .500       .750        3/4        .797       51/64                   17/32    .531         ½             .516    33/64    1.062 1.000

SCREW                 MAX HEAD       COUNTERBORE               PILOT DRILL      SCREW     PILOT DR CLOSE FIT

VINTAGE ANTIQUE OLD SCHOOL JOB SHOP MANUAL MACHINING TOOLS TEACHING COLLEGE CO-OP TRAINING

COMBINE SHIPPING BY PUTTING BUY-IT-NOW ITEMS IN CART AND THEN REQUEST INVOICE FOR 2 OR MORE ITEMS.  SHIP COST BASED ON TOTAL WEIGHT INCL PACKAGE PLUS EBAY FEE ON SHIP COST PLUS MISC COST.

Combined items reduces total shipping cost.  I will combine into a 1 package weight shipping.