← AskMachinist · Guides · Calculator · 🔎 Search
Chamfered Washer Dimensions (DIN 125 Form B / ISO 7090, M5 to M36)
Guide · Updated October 28, 2026
DIN 125 form B covers chamfered flat washers, M5 to M36, now DIN EN ISO 7090. Hole, OD and thickness tolerances agree across the fasteners.eu DIN 125 B / ISO 7090 table, the Fastener World India DIN 125 B sheet and the Veskrep DIN 125 B sheet, with the Westfield ISO 7090 guide matching through M20 (except one M10 OD value). Skipped: chamfer size, weights and sizes above M36. Check your supplier for critical work.
Need an exact reference size?
Build any gage block stack with the free Gage Block Calculator. Free, no login.
Step by step
- Pick the size: Choose M5 to M36; form B starts at M5.
- Read the hole: Hole d1 min is the nominal; max is the tolerance.
- Read the OD: OD d2 max is the nominal.
- Check thickness: Use h min and max for stack-ups.
- Order it: Designate as Washer DIN 125 B 10.5 or ISO 7090 10 200 HV.
DIN 125 B chamfered washer dimensions (mm)
Columns: thread, hole d1 min and max, OD d2 max and min, thickness h min and max.
- Thread | d1 min | d1 max | d2 max | d2 min | h min | h max
- M5 | 5.3 | 5.48 | 10 | 9.64 | 0.9 | 1.1
- M6 | 6.4 | 6.62 | 12 | 11.57 | 1.4 | 1.8
- M7 | 7.4 | 7.62 | 14 | 13.57 | 1.4 | 1.8
- M8 | 8.4 | 8.62 | 16 | 15.57 | 1.4 | 1.8
- M10 | 10.5 | 10.77 | 20 | 19.48 | 1.8 | 2.2
- M12 | 13 | 13.27 | 24 | 23.48 | 2.3 | 2.7
- M14 | 15 | 15.27 | 28 | 27.48 | 2.3 | 2.7
- M16 | 17 | 17.27 | 30 | 29.48 | 2.7 | 3.3
- M18 | 19 | 19.33 | 34 | 33.38 | 2.7 | 3.3
- M20 | 21 | 21.33 | 37 | 36.38 | 2.7 | 3.3
- M22 | 23 | 23.33 | 39 | 38.38 | 2.7 | 3.3
- M24 | 25 | 25.33 | 44 | 43.38 | 3.7 | 4.3
- M27 | 28 | 28.33 | 50 | 49.38 | 3.7 | 4.3
- M30 | 31 | 31.39 | 56 | 55.26 | 3.7 | 4.3
- M33 | 34 | 34.62 | 60 | 58.8 | 4.4 | 5.6
- M36 | 37 | 37.62 | 66 | 64.8 | 4.4 | 5.6
Worked example: M12 washer stack
An M12 DIN 125 B washer has a 13 to 13.27 mm hole, 23.48 to 24 mm OD and 2.3 to 2.7 mm thickness. For a worst-case stack of two washers, allow 5.4 mm.
Common problems
- Need under M5: form B is not made that small; use form A.
- Washer dishing with 10.9 bolts: use 300 HV.
FAQ
Form A vs form B?
DIN 125 form A has no chamfer (ISO 7089 equivalent); form B has a chamfered outer edge (ISO 7090 equivalent) and only exists from M5 up. Hole, OD and thickness match form A at the same size.
Is ISO 7090 the same?
fasteners.eu lists DIN EN ISO 7090 as the current norm for DIN 125 B, and Westfield says ISO 7090 replaces DIN 125 type B.
How is this different from the flat washer chart?
That chart gives ISO 7089 nominal sizes. This page adds form B tolerances and the in-between sizes M7, M14, M18, M22, M27, M30, M33 and M36.
What was skipped?
Chamfer size (no source gives it), weights, and sizes above M36, where one source lists different holes. Westfield shows 21 mm OD at M10; three other sources say 20 mm, so 20 is shown.
Which hardness?
200 HV for bolts up to 8.8, 300 HV up to 10.9 (ISO 7090 classes).
Related guides and calculators
- Small series washers (ISO 7092 / DIN 433)
- Flat washer size chart (SAE, USS, metric)
- Large OD washer dimensions (DIN 9021)
- Heavy-duty washer dimensions (DIN 7989)
- Spring lock washer dimensions (DIN 127 B)
- All free machinist calculators
Build your stack in seconds
The free Gage Block Calculator finds the fewest-block combination for inch and metric sets, with wear blocks. No login.
Questions? Ask a machinist.
General shop information only — follow your drawing, tool maker's data and your quality system.