ISO 7089Flat washer
ISO 7089 M4 Flat washer
ISO 7089 M4 is a flat washer, on a M4 × 0.7 mm metric thread. The general purpose flat washer. It protects the clamped surface, bridges oversized holes and spreads load under the head or nut.
Diameter4 mm
Pitch0.7 mm
Inside Ø d14.3 mm
Outside Ø d29 mm
Thickness h0.8 mm
Dimensions
- Standard
- ISO 7089
- Type
- Flat washer
- Size
- M4
- Thread
- M4 × 0.7
- Total height h
- 0.8 mm
- Inside diameter d1
- 4.3 mm
- Outside diameter d2
- 9 mm
Nominal values in millimetres as published in ISO 7089. Estimated weight 0.308 g per piece in steel (0.31 g in stainless), calculated from the nominal geometry — real parts vary with tolerance and head chamfers.
Thread data
Full M4 thread pageDesignationM4 × 0.7
Pitch0.7 mm
Major Ø4 mm
Pitch Ø3.55 mm
Minor Ø ext3.14 mm
Tap drillØ 3.3 mm
Other lengthsISO 7089 M4
All M4 specificationsInterchangeability
ISO 7089 is catalogued with DIN 125 A as its equivalent designation. Dimensions are compared field by field rather than assumed identical.