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Aircraft General Standard.

Non-Hexagon-headed Bolts.
These bolts have various types of head which include countersunk, round and mushroom and may have a straight slot or a cruciform recess formed in them. They are not marked to indicate their thread size or length; but those made of high tensile steel may be identified by a countersunk indent in the centre of the head on bolts with a straight slot, and by two raised pips on those with a cruciform recess. Those holts made of high tensile corrosion resistant steel are distinguished by an annular groove in the head.

Shear Bolts.
These bolts are made of high tensile steel and are cadmium plated. They may be identified by the thin hexagonal head which is marked with a vee groove to indicate high tensile steel. The marking on the carton label gives the .A.G.S. number followed by a part number consisting of three or four figures. In this number, the number of hundreds indicates the diameter of the bolt in sixteenths of an inch, whilst the other two numbers indicate the length of the plain portion of the bolt in tenths of an inch. that is A.G.S.571 {804 is a shear
bolt of 1/2 in. dia. and 0·4 in. plain length .

Additional Identification. Small bolts,. in common with other small parts (excluding rivets), which have no recognised standard marking and where the material group cannot be readily identified , are distinctively coloured in accordance with the following colour scheme :-

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