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SAE J1580 2011 Edition, October 1, 2011
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Metric Countersunk Holes for Cutting Edges and End Bits
Includes all amendments and changes through Stabilization Notice (No longer revised / updated) , October 2011
Page Count:11
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AIA/NAS Aerospace Standards
this document is to be used on cutting edges and end bits in conjunction with metric bolts (reference ISO 7852-1982) typically used on off-road, self-propelled work machines as described in SAE J1116.

The cutting edges are further defined in SAE J737, J739, J1304, and J1581.

The end bits are further defined in SAE J63.

Purpose—This document specifies the principle shapes and dimensions for countersunk square holes. (See Figure 1 and Figure 2 and Table 1).

NOTE—The inscribed circle of the square holes shall be concentric with the countersink or counterbore within φ 1.6 mm.