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Countersunk socket screws, M2–M8 (ISO 10642 / DIN 7991)

Name: Countersunk socket screws, M2–M8 (ISO 10642 / DIN 7991) dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

What countersink does an M3 flat head screw need? · Hardware · basis: ISO 10642 / DIN 7991 (actual head diameter, 90° countersink)

sizes: 7 in table

Notes

Head sits flush in a 90° countersink. Countersink diameter = head diameter + 0.3 mm; depth = head height. In a print, add 0.2 mm to the diameter.
Head height is about 0.55 × thread. Minimum material under the head on a printed part: 1.5 mm or it pulls through.

Sizes

thread	head_dia_mm	head_height_mm	hex_key_mm	csk_dia_in_print_mm
M2	4.4	1.2	1.3	4.9
M2.5	5.5	1.5	1.5	6.0
M3	6.0	1.7	2.0	6.5
M4	8.0	2.3	2.5	8.5
M5	10.0	2.8	3.0	10.5
M6	12.0	3.3	4.0	12.5
M8	16.0	4.4	5.0	16.5

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

McMaster-Carr	Socket head screws (free STEP/IGES/STL per part, for your own design use; no redistribution)	STEP, IGES, STL, PDF	McMaster-Carr site terms: personal design use, no redistribution verify
Wikipedia	Screw	web	CC BY-SA 4.0 (text)

Free files

★ Free files 35 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

csk-m2x4	ISO 10642 M2 × 4, 90° head, thread as plain cylinder	STEP · STL
csk-m2x6	ISO 10642 M2 × 6, 90° head, thread as plain cylinder	STEP · STL
csk-m2x8	ISO 10642 M2 × 8, 90° head, thread as plain cylinder	STEP · STL
csk-m2x10	ISO 10642 M2 × 10, 90° head, thread as plain cylinder	STEP · STL
csk-m2.5x6	ISO 10642 M2.5 × 6, 90° head, thread as plain cylinder	STEP · STL
csk-m2.5x8	ISO 10642 M2.5 × 8, 90° head, thread as plain cylinder	STEP · STL
csk-m2.5x10	ISO 10642 M2.5 × 10, 90° head, thread as plain cylinder	STEP · STL
csk-m2.5x12	ISO 10642 M2.5 × 12, 90° head, thread as plain cylinder	STEP · STL
csk-m3x6	ISO 10642 M3 × 6, 90° head, thread as plain cylinder	STEP · STL
csk-m3x8	ISO 10642 M3 × 8, 90° head, thread as plain cylinder	STEP · STL
csk-m3x10	ISO 10642 M3 × 10, 90° head, thread as plain cylinder	STEP · STL
csk-m3x12	ISO 10642 M3 × 12, 90° head, thread as plain cylinder	STEP · STL
csk-m3x16	ISO 10642 M3 × 16, 90° head, thread as plain cylinder	STEP · STL
csk-m3x20	ISO 10642 M3 × 20, 90° head, thread as plain cylinder	STEP · STL
csk-m4x8	ISO 10642 M4 × 8, 90° head, thread as plain cylinder	STEP · STL
csk-m4x10	ISO 10642 M4 × 10, 90° head, thread as plain cylinder	STEP · STL
csk-m4x12	ISO 10642 M4 × 12, 90° head, thread as plain cylinder	STEP · STL
csk-m4x16	ISO 10642 M4 × 16, 90° head, thread as plain cylinder	STEP · STL
csk-m4x20	ISO 10642 M4 × 20, 90° head, thread as plain cylinder	STEP · STL
csk-m4x25	ISO 10642 M4 × 25, 90° head, thread as plain cylinder	STEP · STL
csk-m5x10	ISO 10642 M5 × 10, 90° head, thread as plain cylinder	STEP · STL
csk-m5x12	ISO 10642 M5 × 12, 90° head, thread as plain cylinder	STEP · STL
csk-m5x16	ISO 10642 M5 × 16, 90° head, thread as plain cylinder	STEP · STL
csk-m5x20	ISO 10642 M5 × 20, 90° head, thread as plain cylinder	STEP · STL
csk-m5x25	ISO 10642 M5 × 25, 90° head, thread as plain cylinder	STEP · STL
csk-m6x12	ISO 10642 M6 × 12, 90° head, thread as plain cylinder	STEP · STL
csk-m6x16	ISO 10642 M6 × 16, 90° head, thread as plain cylinder	STEP · STL
csk-m6x20	ISO 10642 M6 × 20, 90° head, thread as plain cylinder	STEP · STL
csk-m6x25	ISO 10642 M6 × 25, 90° head, thread as plain cylinder	STEP · STL
csk-m6x30	ISO 10642 M6 × 30, 90° head, thread as plain cylinder	STEP · STL
csk-m8x16	ISO 10642 M8 × 16, 90° head, thread as plain cylinder	STEP · STL
csk-m8x20	ISO 10642 M8 × 20, 90° head, thread as plain cylinder	STEP · STL
csk-m8x25	ISO 10642 M8 × 25, 90° head, thread as plain cylinder	STEP · STL
csk-m8x30	ISO 10642 M8 × 30, 90° head, thread as plain cylinder	STEP · STL
csk-m8x40	ISO 10642 M8 × 40, 90° head, thread as plain cylinder	STEP · STL

Plain text: sheet.txt · JSON: /api/geometry?object=countersunk-screws-metric

Countersunk socket screws, M2–M8 (ISO 10642 / DIN 7991), isometric render of a generated part — Render of csk-m4x12 from the free STEP; not to scale.

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Questions

What countersink for an M3 flat head screw?

90° cone, 6.3 mm diameter at the surface, 1.7 mm deep (6.0 mm head). In a print model 6.5 mm.

What countersink for M4 and M5 flat head screws?

M4: 8.3 mm diameter × 2.3 mm deep. M5: 10.3 mm × 2.8 mm. Always 90° for metric (82° is the imperial standard, not interchangeable).

Can I countersink a 3D printed part?

Yes if there's 1.5 mm or more of material under the head and the cone is modeled, not drilled; printed cones come out clean when the part is oriented with the cone opening downward or the overhang is under 45°.