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Home Construction Basics Estimating Bolts
Home Construction Basics Estimating Bolts
| Estimating Bolts |
| Saturday, 12 April 2008 09:20 | ||||||
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The different types of bolt used in constructions are: 1. Machine bolt - has a head at one end and a short thread at the other end. 2. Countersunk bolt - has a beveled head fitting into a countersunk hole. 3. Key head bolt - has a head shaped end fitted into a groove which will not turn when the nut is screwed into the other end. 4. Stud bolt - has a headless bolt threaded at both ends. 8-2 Size and Length of Bolts The length of bolt required is the sum of the thickness of the pieces being connected plus 12 mm or (1”). With respect to the size or diameter of the bolt, depends upon the thickness of the object to be bolted. The following are important reminders about your bolt: 1. Lumber up to 5 cm. thick use. 6 mm. ¼” diameter. 2. 7.5 cm. thick (3”) lumber use. 10 mm. 3/8” diameter. 3. 10 cm. (4”) thick lumber use. 12 mm. ½” diameter. 4. Drill hole is 1.5 mm. (1/16”) larger than the bolt diameter unless snug fit is necessary. 5. Always use washers under head an nut of machine bolt. 6.. For carriage bolt, use washer under nut only. 7. Use toggle bolt for attaching fixture to plaster wall. 8. Use expansion bolt for fastening to masonry. 9. For outdoor exposure, use brass or cadmium plated finish bolt. Estimating procedure in determining the length of bolts: 1. Wooden post anchored by post strap
2. Post and single beam
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