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| Spindle lock
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The spindle lock locks a freely moving spindle into place, thereby allowing for single wrench blade and disc changes. |
| Spinner handle
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A spinner handle drive tool looks like a screwdriver. The socket attaches to the unit for rapid, light tightening. Can be found with solid or flexible shafts. |
| Spinning reserve
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Electric power plant or utility capacity on line and running at low power in excess of actual load. |
| Spiral column
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Steel cored, concrete columns that have a continuing spiral of reinforced metal around the core. |
| Spiral staircase
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Stair that has treads curving upward around a central point. |
| Spire
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A pointed structure topping a tower or steeple. |
| Spirit level
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Level with a fluid filled glass tube that, when held perfectly level, either vertically or horizontally, allows the bubble that is trapped in the tube to be perfectly centered. |
| Spirit stain or varnish
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Wood stain, that dries quickly, due to the addition of a volatile liquid vehicle that evaporates easily. |
| Splash block
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A pad which is placed under the lower end of a downspout and diverts the water from the downspout away from the house. Usually made out of concrete or fiberglass. |
| Splash guard
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A fabricated metal pan or masonry block that is placed below a leader pipe or downspout and is used to help protect the roof membrane on a lower roof level or to prevent soil erosion when placed on the ground. |
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