Tool PILOTED REAMER .275 INCH X .1636 9/32 X 5/32 PILOT DIA 1/4 LONG X 3 1/2 OAL

Description

Tool PILOTED REAMER .275 INCH X .1636 9/32 X 5/32 PILOT DIA 1/4 LONG X 3 1/2 OAL
SOLID PILOTED REAMER 4-FLUTE SLOW SPIRAL FLUTE HSS HIGH SPEED STEEL 1/2 OZ
OR SOLID PILOTED COUNTERBORE SLOW SPIRAL
* 9/32” X 5/32”   9/32” X 11/64”   17/64” X 5/32”   17/64” X 11/64”
SHANK AND CUTTING DIAMETER GROUND DOWN TO .275” DIAMETER.
FOR #8 CAP SCREW CLOSE FIT HEAD CLOSE FIT SCREW
MRT Co. HI-SP 27 .164
GOOD EDGE - WEAR MARKS ON OD
MR & T CO. IS FOR M. R. & T COMPANY = MILLERSBURG REAMER & TOOL COMPANY
MRB IS FOR MILLERSBURG PENNSYLVANIA USA
OLDEST REFERENCE I FIND IS 1932 SO COMPANY BEGAN BEFORE 1932
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 MACHINE TESTING 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.