ISOscrewsHeadless

ISO 4027 Hexagon Socket Set Screw — Cone Point

ISO cone point counterpart. Cone angle follows the DIN convention: 120° for M6 and above, 90° for M5 and below.

Dimensioned drawing — ISO 4027 M8 × 8L 8⌀4⌀8
ISO 4027 M8 × 8 — HeadlessNominal dimensions in mm · Not to scale

Where it is used

ISO 4027 is the cone point hexagon socket set screw, the ISO counterpart to DIN 914. The tapered point seats into a matching centre hole or a witness mark on the shaft, giving positive location rather than friction alone.

How to choose it

The cone angle follows the DIN convention: 120° for M6 and above, 90° for M5 and below. This point style develops the highest holding force of the four and resists vibration best, at the cost of leaving a permanent impression — so it suits joints set once, not joints taken apart. On a hard shaft the cone can blunt without gripping; drill a shallow seat first.

Dimensions8 sizes · millimetres

Thread dPitch P (mm)Socket size s (mm)
M30.51.5
M40.72
M50.82.5
M613
M81.254
M101.55
M121.756
M1628

Nominal dimensions in millimetres as published in ISO 4027. Tolerances, material requirements and marking are defined separately by the issuing body.

Available sizeslinked to individual specification pages

M30.5 mm pitch
M3 × 3M3 × 4M3 × 5M3 × 6M3 × 8M3 × 10M3 × 12M3 × 16
M40.7 mm pitch
M4 × 4M4 × 5M4 × 6M4 × 8M4 × 10M4 × 12M4 × 16M4 × 20
M50.8 mm pitch
M5 × 5M5 × 6M5 × 8M5 × 10M5 × 12M5 × 16M5 × 20M5 × 25
M61 mm pitch
M6 × 6M6 × 8M6 × 10M6 × 12M6 × 16M6 × 20M6 × 25M6 × 30
M81 mm pitch
M8 × 8M8 × 10M8 × 12M8 × 16M8 × 20M8 × 25M8 × 30M8 × 40
M101.25 mm pitch
M10 × 10M10 × 12M10 × 16M10 × 20M10 × 25M10 × 30M10 × 40M10 × 50
M121.5 mm pitch
M12 × 12M12 × 16M12 × 20M12 × 25M12 × 30M12 × 40M12 × 50M12 × 60
M161.5 mm pitch
M16 × 16M16 × 20M16 × 25M16 × 30M16 × 40M16 × 50M16 × 60M16 × 80

Thread referencesused by the sizes above

M3 × 0.5M4 × 0.7M5 × 0.8M6 × 1M8 × 1 fineM10 × 1.25 fineM12 × 1.5 fineM16 × 1.5 fine

Fitting and interchange notes

Interchangeable with DIN 914; body dimensions are shared with ISO 4026/4028/4029, so the point is the only variable. Because the point is what locates the part, replacing a cone point screw with a flat point in an existing assembly removes the positive location and relies on friction alone — the thread and length being equal does not make the screws equivalent in service.