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Home Construction Basics Determining Screws
Home Construction Basics Determining Screws
| Determining Screws |
| Saturday, 12 April 2008 09:23 | |||
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1. Greater holding power 2. Neat in appearance 3. Less chance of injuring the materials 4. Ease of removal in case of repair How to choose a screw:1. Select one that is long enough wherein one half to two thirds of its length will enter the base in which threads are embedded.2. The length of the screw should be 1/8” or 3 mm less than the combined thickness of the boards being joined. 3. Use fine thread screw for hard wood and coarse for soft wood. How to use the screw:1. Always drill lead hole for the screw.2. Hole on top board should be slightly larger than the shrank, in second board slightly smaller than the threaded portion. 3. In softwood, bore to depth half the length of the thread. 4. In hardwood, bore nearly as deep as the length of the screw. 5. For lag screw, drill hole two-thirds its length then drive in with hammer and finally tighten with wrench. How to buy screw:1. Screws are classified by gauge (thickness) and length. Each gauge has a variety of different lengths which maybe obtained up to 12 cm. (5”).2. When ordering screw, specify head shape, finish, gauge number and length from 2 to 5 centimeters. 3. Square headed lag screw comes in diameter of 6 mm. to 25 mm. (1/4” to 1”) with its length from 4 cm. to 30 cm. (1 ½” to 12”). 8-4 Wood Screw Wood Screw is a screw nail with handed coarse threaded to give a grip. Materials Used 1. Iron 2. Steel 3. Brass 4. Copper 5. Bronze 6. Aluminum Shape of the Head 1. Flat 2. Round 3. Fillister 4. Oval 5. Winged 6. Bung 7. Punched 8. Headless 9. Slotted 10. Square 11. Hexagonal 12. Clove 13. Grooved Shape of the Point 1. Standard 2. Full length 3. Coarse Duty 1. Wood ( Light duty ) 2. Lag ( Heavy duty ) Finish 1. Bright 2. Blued 3. Nickel plated 4. Silver plated 5. Brass 6. Bronzed 7. Coppered 8. Japanned 9. Lacquered 10. Galvanized The 3 Shapes of Screw Point: 1. Gimlet point - is used on wood and coach screw. 2. Diamond point - is used when more driving is done before turning as in drive and lag screw. 3. Conical point - is same as the diamond point.
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