ISO 10642 — Hexagon socket countersunk head screws

Scope: These properties apply to the specified supplier product; it does not certify every Metal-Ad item or establish full conformity to the named DIN/ISO standard.

Property class: 12.9

Hardness: Rc 38-43

Tensile stress: 1040 MPa

Yield stress: 945 MPa

Thread class: 4g 6g

Threads: ANSI B1.13M; ISO 262, coarse series only

Shear stress: 630 MPa

Head angle: 90-92 degrees through M20; 60-62 degrees for larger sizes in this supplier catalog. M24 remains excluded pending product identification.

Dimensions / standard reference: B18.3.5M. DIN EN ISO 10642 is listed as an applicable or similar specification. DIN 7991 equivalence is not assumed.

Application: The supplier recommends flat and button heads for moderate fastening applications such as guards, hinges and covers; not critical high-strength applications.

Length tolerance: Up to 16 mm: +/-0.3 mm; over 16 through 60 mm: +/-0.5 mm; over 60 mm: +/-0.8 mm.

Torque guidance: Supplier torque values apply to plain screws and are calculated to induce 420 MPa in the threads. They are guidelines only; induced loads may vary by +/-25% with mating interface conditions, lubrication, finish, hardness and bolt/joint compliance. No universal installation torque is specified here.

Finish and supply: No verified Metal-Ad coating or availability is established here.