HOLO-KROME® high-strength fasteners

HOLO-KROME is the world-renowned brand of hexagon socket fasteners . The choice of a hexagon socket fastener is decisive: it guarantees the reliability of the assembly, its durability, its ease of use and its conformity. Ignoring or neglecting these factors can be highly detrimental. HOLO-KROME meets the requirements of professional customers in the most demanding industrial applications, such as :

Formula 1 motors	Machine tools	Precision molds and tooling

HOLO-KROME offers a genuine class 12.9 guarantee on all its production batches. This is the solution for maintenance work.
HOLO-KROME has many years' experience in the manufacture of class 12.9.
HOLO-KROME is an American-made product, a brand with a history.
HOLO-KROME offers a wide range of standard products: class 12.9 cylindrical screws, countersunk screws, grub screws, shoulder screws, domed head screws (metric & inch dimensions).
HOLO-KROME provides its end-user customers with full traceability (ISO 10204 3.1 certificates available for the entire range).

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Read the article: "Prevent industrial risks with Holo-Krome".

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Mechanical capabilities

ISO 898-1 defines the mechanical strength classes of screwed steel fasteners. Holo-Krome CHC screws meet class 12.9. They therefore offer high tensile strength (1220 MPa min.), conventional yield strength (1100 MPa min.), elongation (8% min.) and hardness (39-44 Hrc). By opting for identified alloy steel grades, Holo-Krome complies with standard specifications, while allowing its products to be used from -29°C to +200°C.

Fatigue resistance

Fatigue fracture is a phenomenon that occurs after long periods of intense stress. It is a widespread cause of failure. To limit the risks, Holo-Krome's specifications include the following aspects:
Thermo-Forged® - Holo-Krome screws are cold-hammered up to diameter M24. Geometric definition: the various functional parts of the product are subject to stringent specifications and extensive controls. Geometric definition of the cavity: precision, concentricity and depth determine the quality of tightening. Black oxidation: All Holo-Krome screws are black oxidized, giving them a constant coefficient of friction.

Traceability and quality control

From M4 diameter upwards, Holo-Krome engraves a 3-digitHOLO-CODE® traceability code on all cylinder-head screw heads, guaranteeing traceability of the entire manufacturing chain for 25 years.

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