Abstract： ASME B18.6.3:2003 pdf download.Machine Screws and Machine Screw Nuts. 1.2.4 Flat and Oval Countersunk Thm Heads. Flat and oval countersunk trim heads are similar to the 82 deg flat and oval countersunk heads except that the size of head for...

ASME B18.6.3:2003 pdf download.Machine Screws and Machine Screw Nuts.

1.2.4 Flat and Oval Countersunk Thm Heads. Flat and oval countersunk trim heads are similar to the 82 deg flat and oval countersunk heads except that the size of head for a given size screw is one or two sizcs smaller than the regular flat and oval countersunk

head size, and oval countersunk trim heads have a controlled radius where the curved top surface meets the conical bearing surface. Trim heads are lurrusised only in cross recessed head types. Dimensions are given in lables 7A through 7C. and SA through SC,

respectively.

1.2.5 Pan Head. The slotted pan head has a flat top surface rounded into cylindrical sides and a flat bearing surlace The recessed pan head has a rounded top surface blending into cylindrical sides and a flat heating surface. Dimensions are given in Tables .A

through Fl.

1.2.6 FlUister Head. The lillister head has a rounded top surface, cylindrical sides, and a flat beating surface. Dimensions are

given in Tables IOA through IUE. Dimensions of dnlled fillister head machine screws are given in Table 11.

1.2.7 Truss Head. The truss head has a low rounded top surface with a flat bearing surface, the diameter of which for a given screw size is larger than the diameter of the corresponding pan head. Dimensions are given in Tables 12A through 12G.

1.2.8 Binding Head. The binding head has a rounded top surface and slightly tapered sides. The bearing surface is flat and, where

so specified by purchaser, slotted heads shall have an annular undercut adjacent to the shank. Dimensions are given in Tables 13A

through 13E.

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