• Body: 49HRC Edge: 49HRC Thicknesses:  2 / 3 / 4 Description Much of today's packaging is being designed with ease of opening in mind. National's Zipper Rule is designed to maintain package integrity through the distribution channel, yet provide a package that opens without need of knives or other tools.  Available in both serrated style for rotary dies and standard for flat dies, zipper rules can be ordered in a variety of styles depending on the desired tear strength. Like all National products, Zipper rules come in "left hand" or "right hand" and can be customized to meet your specifications.
  • Through-hardened rules have the same hardness in body and edge. A specific tempering and decarburization process achieves a specific rule structure with a soft deep decarburization zone, which results in excellent bending properties. In general, Bohler, Viking, and Helmold cutting edges and bevels have a shaved finish for highest accuracy.

    Bohler Top             

    Body: 45 HRC Edge: 45 HRC Thicknesses: 1.5 / 2 / 3 / 4 Heights (Based on Thickness): .865 – 3.937 Description Top cutting rule offers good bendability, and the body-edge hardness is well balanced for cutting abrasive materials, e.g. solid boxboard, corrugated board, labels, postcards, …
    • Through Hardened – Medium Hard
    • Low – Medium volume runs
    • Cost effective all-purpose rule
    • Ideal for paperboard, boxboard, and corrugated
    • Similar rules include; Viking MM44 and Helmold H65

    Viking MM

    Body: 34 / 40 / 44 / 47 / 52HRC Edge: 34 / 40 / 44 / 47 / 52HRC Thicknesses: 1.5 / 2 / 3 / 4 / 6 Heights (Based on Thickness): .315 (8mm), .375 (9.5mm), .394 (10mm), .473 – 3.937 Description MM cutting rule is an all-purpose, through-hardened cutting rule used primarily for folding carton and corrugated materials.  The 40 and 44 hardness are the most common and most readily available.
    • The same body and cutting edge hardness
    • Good bendability due to soft and ductile surface layer
    • Small to medium size runs
    • Good bending properties
    • All-purpose rule (carton, corrugated)
    • Similar rules include; Bohler Top and Helmold H65

    Helmold 65 Ultraflex

    Body: 45 HRC Edge: 45 HRC Thicknesses: 1.5 / 2 / 3 / 4 Heights: .375 – 2.000 Description Helmold 65 is an all-purpose rule that offers good life when cutting a variety of substrates, e.g. solid boxboard, corrugated board, labels, postcards, …
    • Through Hardened – Medium Hard
    • Low – Medium volume runs
    • Cost-effective all-purpose rule.
    • Ideal for paperboard, boxboard, and corrugated
    • Similar rules include; Bohler Top and Viking MM

    Bohler H 75

    Body: 51 HRC Edge: 51 HRC Thicknesses: 2 / 3 / 4 Heights (Based on Thickness): .865 – 3.937 Description H 75 is a very hard cutting rule which is still bendable to 85° and offers high stability in die cutting operations. The rule life is good when die cutting difficult materials, e.g. gaskets, rubber, cork, felts, beer mats, …
    • Through Hardened – Very Hard
    • Low – Medium volume runs
    • High stability and performance during difficult cutting operations.
    • Ideal for gaskets, rubber, cork, felt, and abrasive materials.
    • Similar rules include; Helmold 70

    Helmold 70

    Body: 50 HRC Edge: 50 HRC Thicknesses: 2 / 3 / 4 Heights (Based on Thickness): .250 – 1.250 Description Helmold 70 is a through-hardened cutting rule that offers increased body strength, yielding improved cutting life for the packaging industry. This product would be classified as a hard rule resulting in longer durability for more abrasive cutting situations, e.g. gaskets, rubber, cork, felts, beer mats, …
    • Through Hardened – Hard
    • Low – Medium volume runs
    • High stability and performance during difficult cutting operations.
    • Ideal for gaskets, rubber, cork, felt, and abrasive materials.
    • Similar rules include; Bohler H 75

    Helmold 80 / 85

    Body: 54 / 58 HRC Edge: 54 / 58 HRC Thickness: 2 Heights: .500 – .937 Description Both Helmold 80 and 85 are through-hardened cutting rules that are recommended for extreme applications that require a very hard body and edge.  Both of these rules are for straight work only.

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