1. Agricultural Mechanics Fundamentals & Applications
UNIT 19—Figuring a Bill of Materials (BOM)

2. Bill of Materials
Define as a list and description of all the materials to be used in constructing a project.

3. Components Bill of materials should include: Item or part name
Number of pieces
Type of material
Size of pieces
Description of parts
Total feet
Unit cost
Cost

4. Tips Calculate: - number of pieces - total footage
- type of wood, etc.
- individual prices
- total cost
Be sure to calculate lumber for the length that is to be purchased—not just the length to be used for the project.

5. Calculating Board Feet
For small lumber:
BF = Thickness (in)  Width (in)  Length (in)
144
Or: BF = T''  W''  L''
For large lumber:
BF = T''  W''  L' 12

6. Pricing Rough Lumber from sawmill is sold by per thousand board feet.
Wood products that are sold in sheets are sold by the panel or by the square foot.
Retail stores sell lumber by linear measurements.

7. Standard Abbreviations
“ or in = inch lb = pound
‘ or ft = foot d = penny(nails)
yd = yard NC= Nat’l coarse
mi = mile NF=Nat’l fine
ea = each NPT=Nat’l pipe
@ = at
N/A = not applicable
pt = pint

8. Standard Abbreviations
LF = linear foot
BF = board foot
S1S = surface 1 side
S2S = surface 2 sides
S3S = surface 3 sides
S4S = surface 4 sides
No. /# = number
in² = square inch
ft² = square foot
yd² = square yard

9. Standard Abbreviations
Square = 10’ X 10’ or 100 square feet
NC = national coarse threads
NF = national fine threads
NPT = national pipe threads
d = penny (nails)
lb = pounds
Cwt = hundredweight (100 lbs)

10. Lumber Available in 6’, 8’, 10’, 12’, 14’, 16’,
Special orders for 18’ & 20’
Widths
1x6 2x4
1x8 2x6
1x10 2x8
1x12 2x10
2x12
4x6

11. Plywood Interior and Exterior grades Available in 4’ x 8’ sheet
Thickness – ¼”, 3/8”, ½”, 5/8”, ¾” 1”

12. Structural Steel Standard Length – 20feet
Flat iron – thickness – 1/8,3/16,1/4,5/16,3/8,1/2
Width – ½, ¾,, 1, 1-1/2, 2, 3, 4, 5 inch
Angle iron – thickness – same as flat iron
Width – 1/2x1/2; 3/4x3/4; 1x1; 1-1/2x1-1/2; 2x2; extends to 4x4
Round –Hot Rolled, Cold Rolled or Tool Steel
Size in diameter = ¼, 5/16,3/8,3/4,1 to 3”

13. Steel Pipe Standard length = 21 feet Black & galvanized Lengths
¼, 3/8, ½, ¾, 1 up to 3 inches

14. Important Terms Item—a separate object.
Rounded Up—when rounding numbers, round to the next highest number.
Tongue and Groove Lumber—lumber with a tonguelike edge sticking out on one side and a groove cut into the other.

15. Terms Cont. Galvanize—coat a metal with zinc.
Cadmium—used for rust-resistant plating of steel products.
Board Foot—an amount of wood equal to a board 1'' thick, 1' wide, and 1' long.