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2. Carriage bolt - Wikipedia

   en.wikipedia.org/wiki/Carriage_bolt

   A carriage bolt (also called coach bolt and round-head square-neck bolt) [1] is a type of bolt. It is also known as a cup head bolt in Australia and New Zealand. It is distinguished from other bolts by its shallow mushroom head and the fact that the cross-section of the shank, though circular for most of its length (as in other kinds of bolt ...

3. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   They are usually made of low grade steel, have a slot or Phillips drive, and are used to join sheet metal parts using a hex or square nut. [12] plow bolt: plough bolt: A plow bolt is bolt similar to a carriage bolt, except the head is flat or concave, and the underside of the head is a cone designed to fit in a countersunk recess.

4. Screw - Wikipedia

   en.wikipedia.org/wiki/Screw

   The numbers stamped on the head of the bolt are referred to the grade of the bolt used in certain application with the strength of a bolt. High-strength steel bolts usually have a hexagonal head with an ISO strength rating (called property class) stamped on the head. And the absence of marking/number indicates a lower grade bolt with low strength.

5. ASTM A490 - Wikipedia

   en.wikipedia.org/wiki/ASTM_A490

   ASTM A490 and ASTM A490M are ASTM International standards for heavy hex structural bolts made from alloy steel.The imperial standard is officially titled Standard Specification for Structural Bolts, Alloy Steel, Heat Treated, 150 ksi Minimum Tensile Strength, while the metric standard (M) is titled Standard Specification for High-Strength Steel Bolts, Classes 10.9 and 10.9.3, for Structural ...

6. List of the United States Army munitions by supply catalog ...

   en.wikipedia.org/wiki/List_of_the_United_States...

   Packed in individual inner black cardboard tubes, 3 tubes packed in outer black cardboard tubes conjoined by three-lobed "cloverleaf" endcaps secured by wingnuts on a central carriage bolt through the center, packed in a long triangular-ended slatted wooden crate. Gross Weight: 172 lbs. Volume: 3.24 Cubic Feet.

7. Metalworking - Wikipedia

   en.wikipedia.org/wiki/Metalworking

   Lathes have four main components: the bed, the headstock, the carriage, and the tailstock. The bed is a precise & very strong base which all of the other components rest upon for alignment. The headstock's spindle secures the workpiece with a chuck, whose jaws (usually three or four) are tightened around the piece. The spindle rotates at high ...