← AskMachinist · Guides · Calculator · 🔎 Search

Timber Washer Dimensions (DIN 1052, M12 to M24)

Guide · Updated October 28, 2026

DIN 1052 covers washers for wood constructions, M12 to M24. Values agree across Lederer, Ferrofast, Daniel and DigiPich DIN 1052 tables, with Fuller Fasteners matching except M20 d1. Values are nominal.

Step by step

1. Find the bolt size: Pick the row for your bolt, M12 to M24.
2. Check the hole: d1 is the washer hole, e.g. 14 mm for M12.
3. Check the bearing area: d2 is the outside diameter that bears on the wood, e.g. 58 mm for M12.
4. Check the stack: Add thickness s (6 or 8 mm) per washer when sizing the bolt.

DIN 1052 timber washer dimensions (mm)

Columns: bolt thread, pitch P, hole d1, outside diameter d2, thickness s (nominal, mm).

• Size | P | d1 | d2 | s
• M12 | 1.75 | 14 | 58 | 6
• M16 | 2 | 18 | 68 | 6
• M20 | 2.5 | 23 | 80 | 8
• M22 | 2.5 | 25 | 92 | 8
• M24 | 3 | 27 | 105 | 8

Worked example: M16 timber washer

An M16 DIN 1052 washer has an 18 mm hole, a 68 mm outside diameter and is 6 mm thick. With a washer under the head and the nut, add 12 mm to the bolt length.

Common problems

• Bolt too short: two 6–8 mm washers add up; include both in the length.
• Will not fit: d2 is up to 105 mm; check the timber face width.
• Wrong series: ISO 7094 / DIN 440 R are smaller; order by standard.

FAQ

DIN 1052 vs ISO 7094 / DIN 440 R?

DIN 1052 washers are bigger and thicker for the same bolt: M12 is 58 x 6 mm vs 44 x 4 mm for ISO 7094.

Is DIN 440 R the same as ISO 7094?

Yes, the dimensions match, so see the ISO 7094 chart for those.

Why is M20 d1 23 mm?

Four sources give 23 mm and one gives 22 mm; the majority value is shown.

Are tolerances listed?

No; the sources give nominal values only.

Related guides and calculators

• Extra large washers (ISO 7094)
• Large washers (DIN 9021)
• Square washers (DIN 436)
• All free machinist calculators

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