



Nominal Size | d | S | k | ||||||
Major Diameter | Width Across Flats | Head Height | |||||||
Min. | Max | Max. | Min | Grade A | Grade B | ||||
Grade A | Grade B | Min | Max. | Min. | Max | ||||
M3 | 2.874 | 2.980 | 5.5 | 5.32 | - | 1.88 | 2.12 | - | - |
M4 | 3.838 | 3.978 | 7 | 6.78 | - | 2.68 | 2.92 | - | - |
M5 | 4.826 | 4.976 | 8 | 7.78 | - | 3.35 | 3.65 | - | - |
M6 | 5.794 | 5.974 | 10 | 9.78 | - | 3.85 | 4.15 | - | - |
M7 | 6.794 | 6.974 | 11 | 10.73 | - | 4.65 | 4.95 | - | - |
M8 | 7.760 | 7.972 | 13 | 12.73 | - | 5.15 | 5.45 | - | - |
M10 | 9.732 | 9.968 | 17 | 16.73 | - | 6.22 | 6.58 | - | - |
M12 | 11.701 | 11.966 | 19 | 18.67 | - | 7.32 | 7.68 | - | - |
M14 | 13.682 | 13.962 | 22 | 21.67 | - | 8.62 | 8.98 | - | - |
M16 | 15.682 | 15.962 | 24 | 23.67 | 23.16 | 9.82 | 10.18 | 9.71 | 10.29 |
M18 | 17.623 | 17.958 | 27 | 26.67 | 26.16 | 11.28 | 11.72 | 11.15 | 11.85 |
M20 | 19.623 | 19.958 | 30 | 29.67 | 29.16 | 12.28 | 12.72 | 12.15 | 12.85 |
M22 | 21.623 | 21.958 | 32 | 31.61 | 31 | 13.78 | 14.22 | 13.65 | 14.35 |
M24 | 23.577 | 23.952 | 36 | 35.38 | 35 | 14.78 | 15.22 | 14.65 | 15.35 |
M27 | 26.577 | 26.952 | 41 | - | 40 | - | - | 16.65 | 17.35 |
M30 | 29.522 | 29.947 | 46 | - | 45 | - | - | 18.28 | 19.12 |
M33 | 32.522 | 32.947 | 50 | - | 49 | - | - | 20.58 | 21.42 |
M36 | 35.465 | 35.940 | 55 | - | 53.8 | - | - | 22.08 | 22.92 |
M39 | 38.465 | 38.940 | 60 | - | 58.8 | - | - | 24.58 | 25.42 |




A:OBT was established in 2003,specializing in the production of casting, CNC machining, forged titanium alloys, high temperature alloys, brass products and one-stop technical solutions for more than 20 years.
Q2. Do you customize products according to our design drawings ?
A:Yes, we are a professional metal manufacturing factory with an experienced engineering team that can make customized products according to customer drawings. We can also reverse-engineer drawings based on samples to produce large quantities of goods.
Q3.Will my design drawings be safe when you get it ?
A:Yes, we will not publish your design to a third party unless your permission is obtained. We can sign NDA before you send the drawings.
Q5.What's your delivery time?
A:In general,the delivery time is within 15-90 days after payment.