Screws in Carpentry: Selection, Usage, and Advantages, Summaries of Construction management

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Screws

In Carpentry work, screw is sometimes used instead of nails due to the following advantages.

1. Greater holding power
2. Neat in appearance
3. Less chance of injuring the materials
4. Ease of removal incase of repair How to Choose your screw
5. Select one that is long enough wherein one half of two thirds of its length will enter the base in which threads are imbedded
6. The length of the screw should be 1/8” or 3mm less than the combined thickness of the boards being joined..
7. Use Fine thread screw for hard wood and coarse thread for soft wood.

How to Buy Screw

1. Screws are classified by gauge and length in inches. Each gauge has a variety of different lengths which may be obtained up to 12 cm. (5 inches)
2. When ordering screw, specify head shape (e.g round head). Finish (brass), gauge number and length from 2 to 5 cm.
3. Square headed lag screw comes in diameter of 6mm to 25mm (1/4 to 1 inch) with its length from 4 cm. to 30 cm. (1-1/2 to 12 inches)

Wood Screw is a screw nail with handed coarse thread to give a grip. a.) Material Used

1. Iron
2. Steel
3. Brass
4. Bronze
5. Copper
6. Aluminum b.) As to Shape of Head
7. Flat 8. Headless
8. Round 9. Slotted (Wood Screw) 3.Fillister 10. Square (Lag Screw)
9. Oval 11. Hexagonal
10. Winged 12. Clove
11. Bung 13. c.) As to Shape
12. Standard
13. Full length
14. Coarse d.) As to Duty
15. Wood (light duty)
16. Lag (heavy duty) e.) As to Finish
17. Bright 6. Blued
18. Nickel Plated 7. Silver Plated
19. Brass 8. Bronzed
20. Coppered 9. Japanned
21. Lacquered 10. Galvanized