← AskMachinist · Guides · Calculator · 🔎 Search

Phillips Raised Countersunk Screw Dimensions (ISO 7047 / DIN 966, M1.6 to M10)

Guide · Updated October 28, 2026

ISO 7047 covers raised countersunk (oval) head screws with type H (Phillips) or type Z (Pozidriv) cross recess, M1.6 to M10, product grade A; it replaced DIN 966. Values agree across the ISO 7047:2011 published table and Fuller Fasteners. Nominal values; penetration is min–max for type H.

Step by step

1. Find the thread: Pick the row for your thread size, M1.6 to M10.
2. Cut the countersink: Use a 90° countersink sized to dk; only the cone k goes below the surface.
3. Allow for the raise: The domed top stands f above the surface, so check clearance for covers and sliding parts.
4. Pick the bit: Recess No. gives the bit size, e.g. PH2 for M3.5 to M5.

ISO 7047 Phillips raised countersunk screw dimensions (mm)

Columns: thread d, pitch P, actual head diameter dk max, countersink height k max, raise height f ≈, head radius rf ≈, cross recess No., type H recess diameter m (ref.), type H penetration depth min–max.

• Size | P | dk | k | f | rf | No. | m | pen.
• M1.6 | 0.35 | 3 | 1 | 0.4 | 3 | 0 | 1.9 | 0.9–1.2
• M2 | 0.4 | 3.8 | 1.2 | 0.5 | 4 | 0 | 2 | 1.2–1.5
• M2.5 | 0.45 | 4.7 | 1.5 | 0.6 | 5 | 1 | 3 | 1.5–1.85
• M3 | 0.5 | 5.5 | 1.65 | 0.7 | 6 | 1 | 3.4 | 1.8–2.2
• (M3.5) | 0.6 | 7.3 | 2.35 | 0.8 | 8.5 | 2 | 4.8 | 2.25–2.75
• M4 | 0.7 | 8.4 | 2.7 | 1 | 9.5 | 2 | 5.2 | 2.7–3.2
• M5 | 0.8 | 9.3 | 2.7 | 1.2 | 9.5 | 2 | 5.4 | 2.9–3.4
• M6 | 1 | 11.3 | 3.3 | 1.4 | 12 | 3 | 7.3 | 3.5–4
• M8 | 1.25 | 15.8 | 4.65 | 2 | 16.5 | 4 | 9.6 | 4.75–5.25
• M10 | 1.5 | 18.3 | 5 | 2.3 | 19.5 | 4 | 10.4 | 5.5–6

Worked example: M4 trim screw

An M4 ISO 7047 head is 8.4 mm across with a 2.7 mm cone. Cut a 90° countersink to about 8.6 mm; the dome then stands about 1 mm (f) above the surface. Use a PH2 bit.

Common problems

• Dome hits a mating part: the raise f sits above the surface; use ISO 7046 flat countersunk where flush is needed.
• Head sits too deep or proud: countersink sized for old DIN 966 or cut at 82°; use 90° sized to dk.
• Bit cams out: PH bit in a PZ recess or wrong size; check recess type and No.

FAQ

What is the difference between raised and flat countersunk?

Same cone and dk as ISO 7046 / ISO 2009, plus a domed top of height f. It looks finished and gives a deeper recess, but it does not sit flush.

Is DIN 966 the same as ISO 7047?

ISO 7047 replaced DIN 966. DIN 966 heads differ from M3 up (for example M5 dk 9.2 vs 9.3, M8 14.5 vs 15.8), so check old stock.

What about Pozidriv (type Z)?

ISO 7047 also allows type Z; its recess diameter is about 0.1–0.2 mm smaller. This chart lists type H.

Why is thread length b not listed?

Sources disagree (ISO gives 25/38 mm minimum, catalogs list DIN-style values), so it was left out.

Related guides and calculators

• Slotted raised countersunk screws (ISO 2010)
• Phillips countersunk screws (ISO 7046)
• Slotted countersunk screws (ISO 2009)
• Countersunk socket screws (ISO 10642)
• All free machinist calculators

General shop information only — follow your drawing, tool maker's data and your quality system.