DIN 963Countersunk head (90°)Slotted

DIN 963 M3 × 5 Countersunk head (90°)

DIN 963 M3 × 5 is a countersunk head screw with a 5 mm nominal length, on a M3 × 0.5 mm metric thread. Slotted flat head screw for a flush finish. Note that countersunk heads pull the joint sideways, so they should not be used to locate parts.

DIN 963 M3 × 5 — Countersunk head (90°)Nominal dimensions in mm · Not to scale

Diameter3 mm

Length5 mm

Pitch0.5 mm

Head Ø dk5.6 mm

Head height k1.65 mm

HeadCountersunk head (90°)

DriveSlotted

Dimensions

Standard: DIN 963
Type: Countersunk head screw
Size: M3 × 5
Thread: M3 × 0.5
Length L: 5 mm
Head diameter dk: 5.6 mm
Head height k: 1.65 mm
Drive: Slotted
Head: Countersunk head (90°)

Nominal values in millimetres as published in DIN 963. Estimated weight 0.471 g per piece in steel (0.474 g in stainless), calculated from the nominal geometry — real parts vary with tolerance and head chamfers.

Thread data

Full M3 thread page

DesignationM3 × 0.5

Pitch0.5 mm

Nominal Ø3 mm

Pitch Ø2.68 mm

Minor Ø ext2.39 mm

Tap drillØ 2.5 mm

Other lengthsDIN 963 M3

All M3 specifications

M3 × 5 M3 × 6 M3 × 8 M3 × 10 M3 × 12 M3 × 16 M3 × 20 M3 × 25

Interchangeability

DIN 963 is catalogued with ISO 2009 as its equivalent designation. Dimensions are compared field by field rather than assumed identical.

Equivalent standardISO 2009Slotted Countersunk Head Screw — Product Grade A ComparisonDIN 963 vs ISO 2009Field-by-field differences and a substitution verdict

Choosing and fitting this size

DIN 963 M3 × 5 is a countersunk head (90°) in M3, 5 mm long under the head, on a 0.5 mm coarse pitch. Mating threads should be a matching class nut or a tapped hole of the same nominal size.

Common stock grades are 8.8, 10.9 and 12.9 in steel, plus A2-70 and A4-80 in stainless. Class 10.9 and 12.9 carry roughly 1.25 and 1.5 times the proof load of 8.8, but they also need a properly rated mating nut — a class 8 nut under a 12.9 bolt simply moves the failure into the thread. Zinc-plated 10.9 and above should be baked to avoid hydrogen embrittlement.

For a tapped hole, M3 × 0.5 mm takes a 2.5 mm tap drill, and the external thread's minor diameter is 2.39 mm — that is the section carrying the load, not the nominal M3 figure. Thread engagement of at least one times the nominal diameter is what lets the bolt fail before the thread strips.