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| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
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| HAUNCH RAFTER |
| A tapered increase in depth of a rafter near the ends in order to increase the section properties. |
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| HAZ |
| See Heat Affected Zone. |
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| H SECTION |
| H shaped hot rolled section having one central web, two equal parallel flanges perpendicular to the web, and the overall depth does not exceed 1.2 times the width of the flange. (See BS4: Part 1 Universal beam universal column, joist.) |
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| HEAT AFFECTED ZONE (HAZ) |
| Part of parent metal which is metallurgically affected by welding but not melted. (Weld zone, fusion zone.) |
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| HIGH STRENGTH FRICTION GRIP BOLT (HSFG) |
| Bolts of tensile steel with high strength nuts hardened washers, pre-tensioned to transfer load by friction between faying surfaces. (See BS4604: Parts 1, 2 and 3 BS:4395.) |
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| HIP ROOF |
| Junction of two roof slopes whose eaves are perpendicular. |
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| HOGGING |
| Vertical deflection of a beam above the datum level. |
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| HOGGING MOMENT |
| Bending moment causing upward deflection in a beam. |
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| HOLDING DOWN BOLTS (HD BOLTS) |
| Bolts connecting a stanchion base to a concrete foundation for anchorage. |
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| HOIST |
| Mechanical lifting device. |
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| HOT ROLLED SECTION |
| A structural shape (universal beam, universal column, channel, angle etc.) made by hot-rolling process. |
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| HORIZONTAL LOAD |
| An applied load acting at right angles to a gravity load. (Crane surge, side wind.) |
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| HOT DIP GALVANISING |
| Method of coating steel members by dipping in a bath of molten zinc. |
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| HSFG BOLTS |
| A bolt which is carefully tightened so as to clamp the mating surfaces. |
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| HYBRID |
| A fabricated section composed of elements of more than one grade of steel. |
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| HYDROGEN CRACKING |
| A serious weld defect caused by excess hydrogen in the weld metal. Cracking occurs some hours after the weld has cooled, and therefore weld testing is always carried out some time after a weld has been placed. |
