National's line of serrated punches are designed with one thing in mind... stripping. Our punches cut cleanly through all board grades, including double wall and wet board right off the corrugator. Made from the highest quality tube steel, National punches are case hardened to a depth of .003" to .005" to insure uniformity. Available with either an inside or center bevel, National rotary punches can be serrated with an 8 Tooth, 12 Tooth, Shallow Profile, or Klean Kut tooth configuration.*
National's serrated punches are available in standard heights of .990" (25.15 mm) and 1.030" (26.16 mm). Other heights as well as Outside Bevel punches are available as a special order.
Standard Cut Sizes** | Center Bevel Tube Diameter | Outside Bevel Tube Diameter | |
Fractional | Decimal | ||
3/16" | .187" (4.75 mm) | na | na |
1/4" | .250" (6.35 mm) | 5/16" | 3/8" |
5/16" | .312" (7.92 mm) | 3/8" | 7/16" |
3/8" | .375" (9.52 mm) | 7/16" | 1/2" |
7/16" | .437" (11.10 mm) | 1/2" | 9/16" |
1/2" | .500" (12.70 mm) | 9/16" | 5/8" |
9/16" | .562" (14.27 mm) | 5/8" | 11/16" |
5/8" | .625" (15.88 mm) | 11/16" | 3/4" |
11/16" | .687" (17.45 mm) | 3/4" | 13/16" |
3/4" | .750" (19.05 mm) | 13/16" | 7/8" |
13/16" | .812" (20.62 mm) | 7/8" | 15/16" |
7/8" | .875" (22.22 mm) | 15/16" | 1" |
15/16" | .937" (23.80 mm) | 1" | 1 1/16" |
1" | 1.000" (25.40 mm) | 1 1/16" | 1 1/8" |
1 1/16" | 1.062" (26.97 mm) | 1 1/8" | 1 3/16" |
1 1/8" | 1.125" (28.57 mm) | 1 3/16" | 1 1/4" |
1 3/16" | 1.187" (30.15 mm) | 1 1/4" | 1 5/16" |
1 1/4" | 1.250" (31.75 mm) | 1 5/16" | 1 3/8" |