← AskMachinist · Guides · Calculator · 🔎 Search
Conical Spring Washer Dimensions (DIN 6796, M2 to M30)
Guide · Updated October 28, 2026
DIN 6796 covers conical spring washers for bolted connections, M2 to M30. Hole, OD, thickness and free height agree across a published DIN 6796 table (Depinspro sheet), the Bossard BN 1374 catalog page and the fasteners.eu DIN 6796 table (Aspen Fasteners shows the same table, so it was not counted on its own). Conflicting cells are shown as a dash. 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 by thread, M2 to M30.
- Read the hole: d1 is the minimum hole (H14).
- Read the OD: d2 is the maximum OD (h14); check it fits the bearing face.
- Read the thickness: s is the material thickness.
- Check free height: h max is the height as delivered; h min is the least height allowed after the permanent set test.
- Order it: Designate as Conical spring washer DIN 6796 - 10 - FSt.
DIN 6796 conical spring washer dimensions (mm)
Columns: thread, hole d1 min, OD d2 max, thickness s, free height h max and h min.
- Thread | d1 | d2 | s | h max | h min
- M2 | 2.2 | 5 | 0.4 | 0.6 | 0.5
- M2.5 | 2.7 | 6 | 0.5 | 0.72 | 0.61
- M3 | 3.2 | 7 | 0.6 | 0.85 | 0.72
- M3.5 | 3.7 | 8 | 0.8 | 1.06 | 0.92
- M4 | 4.3 | 9 | 1 | 1.3 | 1.12
- M5 | 5.3 | 11 | 1.2 | 1.55 | 1.35
- M6 | 6.4 | 14 | 1.5 | 2 | 1.7
- M7 | 7.4 | 17 | 1.75 | 2.3 | 2
- M8 | 8.4 | 18 | 2 | 2.6 | —
- M10 | 10.5 | 23 | 2.5 | 3.2 | 2.8
- M12 | 13 | 29 | 3 | 3.95 | 3.43
- M14 | 15 | 35 | 3.5 | 4.65 | 4.04
- M16 | 17 | 39 | 4 | 5.25 | 4.58
- M18 | 19 | 42 | 4.5 | — | 5.08
- M20 | 21 | 45 | 5 | 6.4 | 5.6
- M22 | 23 | 49 | 5.5 | 7.05 | 6.15
- M24 | 25 | 56 | 6 | 7.75 | 6.77
- M27 | 28 | 60 | 6.5 | 8.35 | 7.3
- M30 | 31 | 70 | 7 | 9.2 | 8
Worked example: M10 bolt
An M10 DIN 6796 washer has a 10.5 mm hole, 23 mm OD, is 2.5 mm thick and stands up to 3.2 mm high before tightening.
Common problems
- Will not fit the bearing face: check d2.
- Washer cracks: it is hardened; do not use it on soft parts without a flat washer.
- Mixed with DIN 127 or DIN 128: those are split; DIN 6796 is a solid cone.
FAQ
What is DIN 6796?
A hardened conical spring washer (420 to 490 HV) for bolted joints, used to keep preload against settling and thermal change.
DIN 6796 vs DIN 127?
DIN 6796 is a solid cone, not split; it is thicker with a larger OD, e.g. M10 is 23 mm OD and 2.5 mm thick.
Why is the M8 h min blank?
Sources disagree: the DIN 6796 table and Bossard give 2.24 mm; fasteners.eu and Aspen give 2.4 mm.
Why is the M18 h max blank?
Sources disagree: the DIN 6796 table and Bossard give 5.8 mm; fasteners.eu and Aspen give 5.6 mm.
What was skipped?
Weights, hole and OD tolerance limits, test loads, M8 h min and M18 h max.
Related guides and calculators
- Thick washers (DIN 7349)
- Wave spring washers (DIN 137 B)
- Spring lock washer dimensions (DIN 127 B)
- Curved spring washer dimensions (DIN 128 A)
- Serrated lock washer dimensions (DIN 6798)
- Tooth lock washer dimensions (DIN 6797)
- Flat washer size chart (SAE, USS, metric)
- 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.