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Spec Sheet

Blank Diameter & Chamfer Flat Dimensions for One Pass Grind & Roll COLD FORM or HOT THREAD ROLLING

CAUTION: Unable to Roll Parts With Cross Drill Holes or Milled Flats.  Call for Information on parts with: thin wall, short threads or *high Heat-Treat.  Now offering *HOT Rolling, on hard materials.

We process many other thread sizes including Metric Threads.  We can roll standard or J-Form threads per your print requirements.  Fillet Rolling services & Special thread dies available.

Blank Diameter and Chamfer Sizes for One Pass Grind before Thread Roll

SIZE         SERIES             MACHINED BLANK DIA.          CHAMFER FLAT

                                                       PLUS .004                           MINUS .010

0             80-NF                                     .053                                        .040

1             64-NC                                     .064                                        .045

               72-NF                                      .065                                        .050

2             56-NC                                     .076                                        .055

               64-NF                                     .077                                        .060

3             48-NC                                     .087                                        .065

               56-NF                                     .089                                        .070

4             40-NC                                     .097                                        .070

               48-NF                                     .100                                        .080

5             40-NC                                     .110                                        .085

               44-NF                                     .112                                        .090

6             32-NC                                     .119                                        .085

               40-NF                                     .123                                        .100

8             32-NC                                     .145                                        .115

               36-NF                                     .147                                        .120

10           24-NC                                     .164                                        .125

               32-NF                                     .171                                        .140

               24-NC                                     .190                                        .145

12           28-NF                                     .195                                        .155

               32-NEF                                   .197                                        .165

               20-NC                                     .219                                        .170

               28-NF                                     .228                                        .190

¼            32-NEF                                   .231                                        .200

               40-NEF                                    .240                                        .210

               56-NS                                      .240                                        .220

               18-NC                                     .278                                        .225

5/16        24-NF                                     .287                                        .245

               32-NEF                                   .294                                        .265

               16-NC                                     .336                                        .275

3/8          24-NF                                     .350                                        .310

               32-NEF                                   .356                                        .325

               14-NC                                     .393                                        .320

7/16        20-NF                                     .407                                        .355

               24-NS                                     .412                                        .370

               13-NC                                     .452                                        .375

1/2          20-NF                                     .469                                        .420

               40-NS                                      .490                                        .460

9/16        18-NF                                     .530                                        .470

               11-NC                                     .567                                        .475

5/8          18-NF                                     .590                                        .535

               24-NEF                                   .600                                        .555

               10-NC                                     .687                                        .590

3/4          16-NF                                     .711                                        .650

               18-NS                                     .715                                        .660

               20-NEF                                   .719                                        .670

               9-NC                                       .804                                        .695

7/8          14-NF                                     .830                                        .760

                16-N                                      .836                                        .775

                8-NC                                       .920                                        .795

1              12-NF                                     .947                                        .865

                14-NS                                     .955                                        .885

               18-NS                                      .965                                        .910

1-1/16     12-N                                       1.010                                      .925

              18 NEF                                    1.028                                      .970

Blanking Dimensions on Additional Sizes available, EMAIL your drawings