(a) the head shall be concentric with the shank within 1% of the basic screw diameter maximum (2% total runout) or 0.006 in. total runout, whichever is greater, when held within one diameter of the head but beyond the fillet.
(b) The socket shall be concentric with the shank within 1-1/2 % of the basic screw diameter maximum (3% total runout) or 0.005 in. total runout, whichever is greater, for sizes through ½ in ., and 3% (6% total runout) for sizes above ½ in.
(c) The conformance of screws to shank straightness or camber limitations set forth as D in table 1E may be checked by the use of the typical gage illustrated in below.
STRAIGHTNESS GAGE AND GAGING
All screws shall be gaged by use of the adjustable rail gage that shall be adjusted to provide a parallel space between the rails equal to De by obtaining common readings on both micrometer heads. The adjustable rail shall then be locked in place by tightening securing screws.
The product shall then be inserted between rails, excluding a length to two diameters under the head. The product shall be rotated by hand a full 360 deg. Any interference occurring between the product and the gage which is sufficient to prevent rotation shall indicate excessive camber.
