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Countersunk Square Holes for Cutting Edges and End Bits
To be used on cutting edges and end bits in conjunction with No. 3 head plow bolts (Ref. ANSI B18.9) typically used on off-road self-propelled work machines as described in SAE J1116.
Cutting edges are further defined in SAE J737, J739, and J1304.
End bits are further defined in SAE J63.
1
When section thickness exceeds A in drawing 1 (Figure 2) (countersunk one side) or B in drawing 4 (countersunk both sides), use counterbore with diameter D, as shown in cross section drawings 2, 5 and 6, or extended countersink C, as shown in cross section drawings 3 and 7.
2
The inscribed circle of the square holes shall be concentric with countersink or counterbore within 0.03 in (0.8 mm).
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