Oval-head screws KS H and slotted SN 213306-4.8 zinc-plated blue

Catalog no.: 1941
20 variants
  • Strength class: 4.8

    The number before the point multiplied by one hundred gives the nominal value of the tensile strength in N/mm2, the number before the point multiplied by the number after the point and multiplied by 10 gives the nominal value of the lower yield strength in N/mm2. The number after the decimal point provides information about the yield strength, as a percentage of the tensile strength.

  • Material: Steel

    Steel is an iron-carbon alloy with a maximum carbon content of 2% by mass. The steels achieve their intended physical and mechanical properties through various hardening, annealing and tempering processes. It is also possible to harden the edge zone by surface hardening, case hardening or nitriding. Well-known steel grades are structural steels, free-machining steels, case-hardening steels, nitriding steels, tempering steels, tool steels and stainless steels.

  • Surface: zinc plated blue

    Blue galvanised finishes are produced either by electroplating in accordance with DIN EN ISO 4042 or by mechanical plating in accordance with DIN EN ISO 12683. For fasteners with a hardness exceeding 390 HV, there is a risk of hydrogen embrittlement during galvanising (electrolytic process). This necessitates specific measures (such as annealing), although these do not provide a 100 per cent guarantee against embrittlement.

  • Drive: Slotted/Crosshead form H

    Combination of a Phillips (H-type) cross recess with a longitudinal slot. Usually the cross recess is used for driving/screwing, and the slot for fine adjustment.

  • Thread type: Metric standard thread
  • Head shape: Lens head
  • Norm SN: 213306
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