(575) A round head bolt with a square neck under the head and a unified thread pitch.
Designed to keep the bolt from turning when a nut is being tightened. The short neck variety is used in sheet metal where a standard sized neck would create an obstruction.
(46) A bolt with a wide, countersunk flat head, a shallow conical bearing surface, an integrally-formed square neck under the head, and a unified thread pitch.
Used primarily in industrial belting systems where head clearances must be minimal.
(115) A bolt having a forged head in the form of an open or closed anchor ring. Shoulder pattern eyebolts have an unthreaded shoulder below the anchor ring which is greater in diameter than the threaded shank.
Used in applications where a forged shank is required, e.g., in rigging when mounted atop a uniformly distributed weight.
(650) An alloy or stainless steel hex bolt with a wider head than that of a standard hex machine bolt, manufactured in accordance with ASTM Standard A193.
Offers greater wrenching area than standard hex machine bolts. Used for pressure vessels, valves, flanges, and fittings for high-temperature service.
(470) A low carbon steel hex bolt with a wider head than that of a standard hex machine bolt, manufactured in accordance with ASTM Standard A307.br> Offers greater wrenching area than standard hex machine bolts. Used in heavy industrial work.
(49) An alloy or stainless steel hex bolt with a wider head than that of a standard hex machine bolt, manufactured in accordance with ASTM Standard A320.
(53) A quenched and tempered alloy steel hex bolt with a wider head than that of a standard hex machine bolt, manufactured in accordance with ASTM Standard A354.
Offers greater wrenching area than standard hex machine bolts. Used in applications at normal atmospheric temperatures, where high strength is required.
(115) A quenched and tempered steel hex bolt with a wider head than that of a standard hex machine bolt, manufactured in accordance with ASTM Standard A449.
Offers greater wrenching area than standard hex machine bolts. Used for general applications where high strength is required.
(915) An externally threaded fastener, with a trimmed hex head, but with no washer face on the bearing surface, manufactured in accordance with ASTM Standard A307A Grade A. (Its body tolerances are not as close as those of a hex cap screw.)
Used in a variety of general purpose applications (depending on the grade of the material) in situations where dimensional tolerances are not as critical.
(56) An externally threaded fastener, with a trimmed hex head, but with no washer face on the bearing surface. (Its body tolerances are not as close as those of a hex cap screw.)
Used in a variety of general purpose applications (depending on the grade of the material) in situations where dimensional tolerances are not as critical.
(1,285) A hex machine bolt threaded to the head with metric thread pitch. Generally manufactured in accordance with DIN Standard 933 or ISO Standard 4017.
Used as control arms in linkage and clamping assemblies. Also work well as a stationary hinge point and in situations where the bolt must swing out of the way.
(481) An externally threaded fastener, with a trimmed, square shaped external wrenching head.
Used in applications where the use of power tools is impractical or undesirable. Offers greater bearing area for more positive gripping with a hand wrench.
(25) A plain, circular, oval head bolt with a square neck to prevent rotation. The head diameter is about 3 times that of the bolt body.
Used in joining resilient materials or sheet metal to supporting steel structures, e.g., automobile or truck floor surfaces to the steel framework. Also used where wood is bolted down as decking since the larger diameter head of the bolt will not pull through.
(394) A heavy hex bolt made of medium carbon steel, manufactured in accordance with ASTM Standard A325. The bearing surface is flat and washer faced and the point is chamfered.
Used in structural steel joints in heavy construction.
(95) A heavy hex bolt made of alloy steel, manufactured in accordance with ASTM Standard A490. The bearing surface is flat and washer faced and the point is chamfered.
Used in structural steel joints in heavy construction when greater yield and tensile strengths than those of an A325 structural bolt are required.
