Table 2. American National Standard Slotted, Cross and Square Recessed Flat Countersunk Head Metric Machine Screws ANSI/ASME B18.6.7M-1999 (Withdrawn)
T
Theoretical Actual Edge of Head May be Flat or Rounded
D K D K
R
D SH
R
N
90° 92°
90° 92°
D S
D S
L SH
K
B
K
L
Slotted and Style A
Style B
D K
D S
D SH a
D S
L SH a
K
R
N
T
Head Diameter
Nominal Screw Size and Thread Pitch
Body and Shoulder Diameter
Shoulder Diame ter
Body Diame ter
Underhead Fillet Radius
Shoulder Length
Theoretical Sharp
Head Height
Slot Width
Slot Depth
Body Diameter
Actual
Max. Ref.
Max. 2.00 2.50 3.00 3.50 4.00 5.00 6.00 8.00 10.00
Min. 1.65 2.12 2.58 3.00 3.43 4.36 5.21 7.04 8.86
Max. 2.00 2.50 3.00 3.50 4.00 5.00 6.00 8.00 10.00
Min. 1.86 2.36 2.86 3.32 3.82 4.82 5.82 7.78 9.78
Min. 1.65 2.12 2.58 3.00 3.43 4.36 5.21 7.04 8.86
Max. 0.50 0.55 0.60 0.70 0.80 0.90 1.10 1.40 1.70
Min. 0.30 0.35 0.40 0.50 0.60 0.70 0.90 1.10 1.30
Max.
Min.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
4.4 5.5 6.3 8.2 9.4
4.1 5.1 5.9 7.7 8.9 9.8
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
0.8
0.4 0.5 0.6 0.7 0.8 1.0 1.2 1.6
0.7 0.8 1.0 1.2 1.5 1.5 1.9 2.3
0.5 0.6 0.8 1.0 1.2 1.2 1.6 2.0
0.6 0.7 0.9 1.2 1.3 1.4 1.6 2.3
0.4 0.5 0.6 0.9 1.0 1.1 1.2 1.8
M2 × 0.4 b M2.5 × 0.45 M3 × 0.5 M3.5 × 0.6 M4 × 0.7 M5 × 0.8 M6 × 1 M8 × 1.25
1.0 1.2 1.4 1.6 2.0 2.4 3.2 4.0
10.4 12.6 17.3 20.0
11.9 16.5 19.2
10.9 15.4 17.8
M10 × 1.5 2.0 a All recessed head heat-treated steel screws of property class 9.8 or higher strength have the Style B head form. Recessed head screws other than those specifically designated to be Style B have the Style A head form. The underhead shoulder on the Style B head form is mandatory and all other head dimensions are common to both the Style A and Style B head forms. b This size is not specified for Type III square recessed flat countersunk heads; Type II cross recess is not specified for any size. 5.0 2.0 2.8 2.5 2.6
All dimensions in millimeters. For dimension B , see Table 1. For dimension L , see Table 6.
Made with FlippingBook - Share PDF online