M6 Screw Size Chart – Head Dimensions, Drive Sizes & Thread Pitch | Monster Bolts
M6 screw and bolt sizes are widely used in automotive, machinery, furniture, and DIY. Use this chart to quickly find head height, head diameter, and drive size for popular M6 types. If you’re new to standards, DIN and ISO numbers are the exact identifiers that define official dimensions (e.g., DIN 912, ISO 7380). Standard coarse thread for M6 is M6-1.0.
Metric M6-1.0 (Coarse) – Dimensions & Drive Sizes
| Type | DIN | ISO | Head Height | Head Diameter | Drive Size |
|---|---|---|---|---|---|
| M6 Hex Bolts (FT) | 933 | 4017 | 4.15 mm | 11.05 mm* | 10 mm WAF |
| M6 Hex Bolts (PT) | 931 | 4014 | 4.15 mm | 11.05 mm* | 10 mm WAF |
| M6 Socket Head Cap | 912 | 4762 | 6.0 mm | 10.22 mm | 5 mm hex |
| M6 Low Head Socket Cap | 7984 | — | 4.0 mm | 10.0 mm | 4 mm hex |
| M6 Button Head Socket | 9427 | 7380 | 3.3 mm | 10.5 mm | 4 mm hex |
| M6 Flat Head Socket | 7991 | 10642 | 3.72 mm | 13.44 mm | 4 mm hex |
| M6 Phillips Flat Head | 965 | — | 3.0 mm | 11.0 mm | #3 Phillips |
| M6 Phillips Pan Head | 7985 | 7045 | 4.75 mm | 12.0 mm | #3 Phillips |
All of these pair with matching M6 nuts and M6 washers.
Legend: PT = Partial Thread, FT = Full Thread. * = Width Across Flats (hex).
- Metric Thread Pitch Table • US TPI (comparison)
- How to Measure Length & Diameter • Printable Ruler (to scale)
- Shop all M6 fasteners — fast shipping from Milton, Florida.
M6 FAQs
What hex key fits an M6 socket head cap screw?
Typically a 5 mm hex key. Low-head and button socket styles commonly use a 4 mm hex.
What nut fits an M6 screw?
M6 screws pair with M6 nuts and M6 washers. Metric fasteners always match by nominal diameter.
What is the standard M6 thread pitch?
Standard coarse pitch is M6-1.0. Fine pitches such as M6-0.75 or M6-0.5 exist—verify your tapped hole or nut before ordering.
Is an M6 the same as 1/4-20?
No. While sizes are close, M6-1.0 (metric) and 1/4-20 (imperial) use different thread systems and are not interchangeable.
What tap drill size is used for M6-1.0?
A common tap drill for M6-1.0 is 5.0 mm. Always confirm for your material and application.