Table 3. American National Standard Slotted, Cross and Square Recessed Oval Countersunk Head Metric Machine Screws ANSI/ASME B18.6.7M-1999 (Withdrawn)
D K D K
Theoretical Actual
T
R
N
90° 92°
Edge of Head May be Flat or Rounded
R F
D S
K
B
L
F
D S
D K
K
F
R F
R
N
T
Head Diameter
Nominal Screw Size and Thread Pitch
Head Top Radius
Underhead Fillet Radius
Head Side Height
Raised Head Height
Body Diameter
Theoretical Sharp
Slot Width
Slot Depth
Actual
Max. Ref.
Max.
Min. 1.65 2.12 2.58 3.00 3.43 4.36 5.21 7.04 8.86
Max.
Min.
Min.
Max.
Approx.
Max.
Min.
Max.
Min.
Max.
Min.
2.00 2.50 3.00 3.50 4.00 5.00 6.00 8.00
4.4 5.5 6.3 8.2 9.4
4.1
3.5 4.4 5.2 6.9 8.0 8.9
1.2 1.5 1.7 2.3 2.7 2.7 3.3 4.6 5.0
0.5 0.6 0.7 0.8 1.0 1.2 1.4 2.0 2.3
5.0 6.6 7.4
0.8 1.0 1.2 1.4 1.6 2.0 2.4 3.2 4.0
0.4 0.5 0.6 0.7 0.8 1.0 1.2 1.6 2.0
0.7 0.8 1.0 1.2 1.5 1.5 1.9 2.3 2.8
0.5 0.6 0.8 1.0 1.2 1.2 1.6 2.0 2.5
1.0 1.2 1.5 1.7 1.9 2.4 2.8 3.7 4.4
0.8 1.0 1.2 1.4 1.6 2.0 2.4 3.2 3.8
M2 × 0.4 a
5.1 5.9 7.7 8.9 9.8
M2.5 × 0.45 M3 × 0.5 M3.5 × 0.6 M4 × 0.7 M5 × 0.8
10.9 11.6 11.9 14.9 19.7 22.9
10.4 12.6 17.3 20.0
11.9 16.5 19.2
10.9 15.4 17.8
M6 × 1
M8 × 1.25 M10 × 1.5
10.00
a This size is not specified for Type III square recessed oval countersunk heads; Type II cross recess is not specified for any size. All dimensions in millimeters. For dimension B , see Table 1. For dimension L , see Table 6.
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