Dimensions of Metric Hex Cap Screws - 8.8 Coarse
MetricHexCapScrews

Metric Hex Cap Screws
ANSI B18.2.3.1M, ISO 4014, DIN 931
D DS S E K K1 C DW
Nom. Screw
Dia. & Thread Pitch
Body Dia. Width Across
Flats
(Wrench Size)
Width Across
Corners
Head 
Height
Wrench Height Washer
Face
Thickness
Wash. Face Dia.
Max Min Max Min Max Min Max Min Min Max Min Min
M5x0.8 5.00 4.82 8 7.78 9.24 8.79 3.65 3.35 2.4 0.5 0.2 6.9
M6x1 6.00 5.82 10 9.78 11.55 11.05 4.15 3.85 2.8 0.5 0.2 8.9
M8x1.25 8.00 7.78 13 12.73 15.01 14.38 5.50 5.10 3.7 0.6 0.3 11.6
M10x1.5 10.00 9.78 *16/17 15.73 18.48 17.77 6.63 6.17 4.5 0.6 0.3 14.6
M12x1.75 12.00 11.73 *18/19 17.73 20.78 20.03 7.76 7.24 5.2 0.6 0.3 16.6
M14x2 14.00 13.73 *21/22 20.67 24.25 23.35 9.09 8.51 6.2 0.6 0.3 19.6
M16x2 16.00 15.73 24 23.67 27.71 26.75 10.32 9.68 7.0 0.8 0.4 22.5
M20x2.5 20.00 19.67 30 29.16 34.64 32.95 12.88 12.12 8.8 0.8 0.4 27.7
M24x3 24.00 23.67 36 35.00 41.57 39.55 15.44 14.56 10.5 0.8 0.4 33.2
M30x3.5 30.00 29.67 46 45.00 53.12 50.85 19.48 17.92 13.1 0.8 0.4 42.7
M36x4 36.00 35.61 55 53.80 63.51 60.79 23.38 21.62 15.8 0.8 0.4 51.1
M42x4.5 42.00 41.38 65 62.90 75.06 71.71 26.97 25.03 18.2 1.0 0.5 59.8
M48x5 48.00 47.38 75 72.60 86.60 82.76 31.07 28.93 21.0 1.0 0.5 69.0
M56x5.5 56.00 55.26 85 82.20 98.15 93.71 36.20 33.80 24.5 1.0 0.5 78.1
M64x6 64.00 63.26 95 91.80 109.70 104.65 41.32 38.68 28.0 1.0 0.5 87.2
M72x6 72.00 71.26 105 101.40 121.24 115.60 46.45 43.55 31.5 1.2 0.6 96.3
M80x6 80.00 79.26 115 111.00 132.72 126.54 51.58 48.42 35.0 1.2 0.6 105.4
M90x6 90.00 89.13 130 125.50 150.11 143.07 57.74 54.26 39.2 1.2 0.6 119.2
M100x6 100.00 99.13 145 140.00 167.43 159.60 63.90 60.10 43.4 1.2 0.6 133.0
*DIN 931 spec calls for maximum width across flats on these 3 sizes to be 17, 19 & 22 mm, respectively.