# Chipboard screws, DIN 7505 (3, 3.5, 4, 4.5, 5, 6 mm): pan, countersunk and oval-countersunk head dimensions, cross recess size + type-B envelope models

> What are the head diameter, head height and cross recess size of a 4 mm or 5 mm chipboard (particle board) screw?

- Category: Hardware › Fasteners
- Kind: Standard part
- Basis: fasten.it's DIN 7505 table (types A, B and C, the 1986 edition, now with no current standard of its own), Flints' catalogue for the Spax drive sizes; six type-B envelope models as files
- Page: https://xemstudio.com/objects/chipboard-wood-screws-din-7505/ · JSON: https://xemstudio.com/api/geometry?object=chipboard-wood-screws-din-7505 · Plain text: https://xemstudio.com/objects/chipboard-wood-screws-din-7505/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
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## Overall (mm)

| length | width | height |
|---|---|---|
| 40.0 | 12.0 | 12.0 |

**Exact dimensions.** True size, with no tolerance added.

## Notes

- Millimetres. DIN 7505 covers screws for particle board with cross recess form Z in three head forms: A pan, B flat countersunk, C oval countersunk; nominal diameters 3, 3.5, 4, 4.5, 5 and 6 mm. fasten.it states there are no more technical norms for these screws and that sizes can vary between makers. The page prints no lengths. Columns follow the page: nominal diameter, P (pitch, ±10 %), dk (head diameter, min–max), k (head height, max for A and B, ≈ for C), a (max), r (min for A, min–max for B, max for C), d1 and d2 (min–max, not defined on the page), recess number, m (≈, not defined) and t (min–max, not defined).
- Recess number agrees with the Spax pairing in Flints' catalogue: 3 mm PZ1; 3.5, 4, 4.5 and 5 mm PZ2; 6 mm PZ3 (Flints prints only the drive size, no head dimensions). Klimas' Ø5 mm KMH chipboard screw sheet (PZ2) was found but not tabulated.
- Pilot holes are not on this page: no published table for metric chipboard screws could be verified (Spax' own sheets give only 'without pre-drilling, depending on the wood'). Flints' catalogue has a pilot-hole table for imperial gauge numbers, which is on wood-screws-flat-head-inch as a separate set of sources, not converted here.
- Files are Xem-drawn envelopes of the type B head, not the real screw: a cone from dk max at the top down to the nominal diameter over k max, then a plain shank at the nominal diameter (the real thread major diameter is d1 and the thread is smaller at the root); no cross recess, no thread, no point. The overall length 40 mm is an example chosen by Xem for all six files, not a published length.
- Not on this page: SPAX trade-name geometry (4CUT tip, T-STAR plus drive), Torx-drive chipboard screws, and screw lengths. Countersunk metric machine screws: countersunk-screws-metric.

## Sizes

| head type | nominal Ø | P (pitch ±10 %) | dk (head dia, min–max) | k (height) | a max | r | d1 (min–max) | d2 (min–max) | recess no. | m ≈ | t (min–max) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Type A (pan head) | 3 | 1.35 | 5.52–6 | 2.37 (max) | 1.35 | 0.25 min | 2.75–3 | 1.5–1.9 | 1 | 3.12 | 1.68–1.93 |
| Type A (pan head) | 3.5 | 1.6 | 6.62–7 | 2.72 (max) | 1.6 | 0.3 min | 3.2–3.5 | 1.67–2.15 | 2 | 3.81 | 1.65–2.11 |
| Type A (pan head) | 4 | 1.8 | 7.42–8 | 2.92 (max) | 1.8 | 0.3 min | 3.7–4 | 2.02–2.5 | 2 | 4.65 | 1.9–2.36 |
| Type A (pan head) | 4.5 | 2 | 8.42–9 | 3.15 (max) | 2 | 0.3 min | 4.2–4.5 | 2.22–2.7 | 2 | 5 | 2.64–3.1 |
| Type A (pan head) | 5 | 2.2 | 9.42–10 | 3.65 (max) | 2.2 | 0.3 min | 4.7–5 | 2.52–3 | 2 | 5.28 | 2.64–3.1 |
| Type A (pan head) | 6 | 2.6 | 11.3–12 | 4.25 (max) | 2.6 | 0.4 min | 5.7–6 | 3.22–3.7 | 3 | 6.63 | 3.02–3.48 |
| Type B (flat countersunk) | 3 | 1.35 | 5.6–6 | 1.9 (max) | 1.6 | 1.2–1.6 | 2.8–3 | 1.7–1.9 | 1 | 3 | 1.6–2 |
| Type B (flat countersunk) | 3.5 | 1.6 | 6.6–7 | 2.1 (max) | 1.8 | 1.5–1.9 | 3.3–3.5 | 2–2.2 | 2 | 4 | 1.6–2.1 |
| Type B (flat countersunk) | 4 | 1.8 | 7.5–8 | 2.5 (max) | 2 | 1.6–2.1 | 3.75–4 | 2.25–2.5 | 2 | 4.4 | 2.05–2.5 |
| Type B (flat countersunk) | 4.5 | 2 | 8.5–9 | 2.7 (max) | 2.2 | 1.8–2.3 | 4.25–4.5 | 2.45–2.7 | 2 | 4.8 | 2.6–3.1 |
| Type B (flat countersunk) | 5 | 2.2 | 9.5–10 | 3 (max) | 2.5 | 2–2.6 | 4.7–5 | 2.7–3 | 2 | 5.3 | 3–3.45 |
| Type B (flat countersunk) | 6 | 2.6 | 11.5–12 | 3.6 (max) | 3 | 2–2.6 | 5.7–6 | 3.4–3.7 | 3 | 6.6 | 3–3.45 |
| Type C (oval countersunk) | 3 | 1.35 | 5.7–6 | 1.8 (≈) | 2.35 | 1.5 max | 2.75–3 | 1.5–1.9 | 1 | 3.12 | 1.78–2.08 |
| Type C (oval countersunk) | 3.5 | 1.6 | 6.64–7 | 2 (≈) | 2.6 | 1.8 max | 3.2–3.5 | 1.67–2.15 | 2 | 4.06 | 1.81–2.11 |
| Type C (oval countersunk) | 4 | 1.8 | 7.64–8 | 2.35 (≈) | 2.8 | 2 max | 3.7–4 | 2.02–2.5 | 2 | 4.65 | 2.42–2.72 |
| Type C (oval countersunk) | 4.5 | 2 | 8.64–9 | 2.55 (≈) | 3 | 2.2 max | 4.2–4.5 | 2.22–2.7 | 2 | 5.08 | 2.85–3.15 |
| Type C (oval countersunk) | 5 | 2.2 | 9.64–10 | 2.85 (≈) | 3.2 | 2.5 max | 4.7–5 | 2.52–3 | 2 | 5.28 | 2.89–3.35 |
| Type C (oval countersunk) | 6 | 2.6 | 11.57–12 | 3.35 (≈) | 3.6 | 2.5 max | 5.7–6 | 3.22–3.7 | 3 | 7 | 3.4–3.86 |

## Where the files are

- fasten.it: [DIN 7505 particle board (chipboard) screws with cross recess Z, types A (pan), B (countersunk) and C (oval countersunk), 3 to 6 mm: P, dk, k, a, r, d1, d2, recess no., m, t (1986 table; no lengths)](https://www.fasten.it/norms/norm/din_7505) — web — Reference page; numbers only. The page does not define the column letters beyond the names dk, k and the nominal diameter
- Flints (catalogue PDF): [Wood screw gauge table (No. 2 to 14: diameter mm, pilot hole) and Spax metric screws by nominal diameter 3 / 3.5 / 4 / 4.5 / 5 / 6 mm with drive PZ1 / PZ2 / PZ3](https://www.flints.co.uk/pdf/catalogue/screws.pdf) — web — Distributor catalogue; numbers only
- Klimas (via JMB): [Wkret-met KMH chipboard screw, countersunk head, Ø5 mm, PZ2: technical sheet (cross-reference; not tabulated)](https://jmbonline.sk/cdn/shop/files/KLIMAS_Wkret-met_KMH_O5_mm_PZ-2_skrutka_do_dreva_so_zapustnou_krizovou_hlavou_-_technicky_list_EN.pdf) — web — Maker sheet; not used for numbers

## Free STEP/STL (6 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/chipboard-wood-screws-din-7505/index.json

- chipboard-screw-din-7505-b-3x40-envelope: [STEP](https://xemstudio.com/files/hardware/chipboard-wood-screws-din-7505/chipboard-screw-din-7505-b-3x40-envelope.step) · [STL](https://xemstudio.com/files/hardware/chipboard-wood-screws-din-7505/chipboard-screw-din-7505-b-3x40-envelope.stl) — DIN 7505 type B 3 mm countersunk chipboard screw envelope: head Ø6 (dk max) tapering to the Ø3 nominal body over 1.9 mm (k max); plain body, example overall length 40 mm (Xem's choice); no cross recess, thread or point
- chipboard-screw-din-7505-b-3-5x40-envelope: [STEP](https://xemstudio.com/files/hardware/chipboard-wood-screws-din-7505/chipboard-screw-din-7505-b-3-5x40-envelope.step) · [STL](https://xemstudio.com/files/hardware/chipboard-wood-screws-din-7505/chipboard-screw-din-7505-b-3-5x40-envelope.stl) — DIN 7505 type B 3.5 mm countersunk chipboard screw envelope: head Ø7 (dk max) tapering to the Ø3.5 nominal body over 2.1 mm (k max); plain body, example overall length 40 mm (Xem's choice); no cross recess, thread or point
- chipboard-screw-din-7505-b-4x40-envelope: [STEP](https://xemstudio.com/files/hardware/chipboard-wood-screws-din-7505/chipboard-screw-din-7505-b-4x40-envelope.step) · [STL](https://xemstudio.com/files/hardware/chipboard-wood-screws-din-7505/chipboard-screw-din-7505-b-4x40-envelope.stl) — DIN 7505 type B 4 mm countersunk chipboard screw envelope: head Ø8 (dk max) tapering to the Ø4 nominal body over 2.5 mm (k max); plain body, example overall length 40 mm (Xem's choice); no cross recess, thread or point
- chipboard-screw-din-7505-b-4-5x40-envelope: [STEP](https://xemstudio.com/files/hardware/chipboard-wood-screws-din-7505/chipboard-screw-din-7505-b-4-5x40-envelope.step) · [STL](https://xemstudio.com/files/hardware/chipboard-wood-screws-din-7505/chipboard-screw-din-7505-b-4-5x40-envelope.stl) — DIN 7505 type B 4.5 mm countersunk chipboard screw envelope: head Ø9 (dk max) tapering to the Ø4.5 nominal body over 2.7 mm (k max); plain body, example overall length 40 mm (Xem's choice); no cross recess, thread or point
- chipboard-screw-din-7505-b-5x40-envelope: [STEP](https://xemstudio.com/files/hardware/chipboard-wood-screws-din-7505/chipboard-screw-din-7505-b-5x40-envelope.step) · [STL](https://xemstudio.com/files/hardware/chipboard-wood-screws-din-7505/chipboard-screw-din-7505-b-5x40-envelope.stl) — DIN 7505 type B 5 mm countersunk chipboard screw envelope: head Ø10 (dk max) tapering to the Ø5 nominal body over 3 mm (k max); plain body, example overall length 40 mm (Xem's choice); no cross recess, thread or point
- chipboard-screw-din-7505-b-6x40-envelope: [STEP](https://xemstudio.com/files/hardware/chipboard-wood-screws-din-7505/chipboard-screw-din-7505-b-6x40-envelope.step) · [STL](https://xemstudio.com/files/hardware/chipboard-wood-screws-din-7505/chipboard-screw-din-7505-b-6x40-envelope.stl) — DIN 7505 type B 6 mm countersunk chipboard screw envelope: head Ø12 (dk max) tapering to the Ø6 nominal body over 3.6 mm (k max); plain body, example overall length 40 mm (Xem's choice); no cross recess, thread or point

## Questions

**What is the head diameter of a 4 mm chipboard screw?**

Type B countersunk: 7.5 to 8 mm (dk), 2.5 mm high (k max); type A pan head 7.42 to 8 mm, 2.92 mm high. Recess number 2 (PZ2).

**What Pozidriv size for a 6 mm chipboard screw?**

Recess number 3 (PZ3) in DIN 7505 as listed on fasten.it; Flints lists Spax 6 mm screws with PZ3.

**What countersink diameter for a 5 mm chipboard screw?**

The type B head is 9.5 to 10 mm across (dk) and 3 mm high (k max); the oval head type C is 9.64 to 10 mm across.

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