2012-2013 Ford Focus Service & Repair Manual

OTHER TYPES OF PARTS Metric identification schemes vary by type of part, most often a variation of that used for bolts and nuts. Note that many types of English and Metric fasteners carry no special identification if they are otherwise unique. ENGLISH SYSTEM Grade 1 or 2 Grade 5 Grade 8 English bolts: Identification marks on the bolt head represent Rockwell hardness. Generally, the bolt’s grade is equal to the number of marks plus two. The higher the grade, the stronger the bolt. METRIC SYSTEM 4.6 4.8 5.8 8.8 9.8 10.9 Metric bolts: Identification class numbers on bolt heads represent tensile strength. Higher numbers indicate stronger bolts. Common metric fastener bolt strength properties are 9.8 and 10.9. BOLT STRENGTH IDENTIFICATION HEX NUT STRENGTH IDENTIFICATION ENGLISH SYSTEM METRIC SYSTEM Identification dots represent Rockwell hardness. The nut’s grade is equal to the number of dots plus two. The higher the grade, the stronger the nut. METRICS CLASS 10.9 CLASS 9.8 CLASS 8.8 –Stamped U-Nuts –Studs, Large studs may carry the property class number. Smaller studs use a geometric code on the end. Identification class numbers on nuts represent tensile strength. Higher numbers indicate stronger nuts. Nuts may also have blue finish or paint daub on hex flat. 9 –Tapping, thread forming and certain other case hardened screws. 2 MET Grade 5 Grade 8 Revision 1, 8/10/2000

DESCRIPTION MULTIPLY BY FOR METRIC EQUIVALENT Acceleration ft/s 2 0.3048 m/s 2 in/s 2 0.0254 m/s 2 Torque lb-in 0.11298 N . m lb-ft 1.3558 N . m Power horsepower 0.746 kW Pressure or Stress inches of water 0.2491 kPa psi 6.895 kPa psi 0.069 bar Energy or Work BTU 1055.0 Joules(J) lb-ft 1.3558 Joules(J) kiloWatt-hour 3,600,000 Joules(J) or 3.6 x 10 6 Light foot candle 10.764 lumens/square meter (lm/m 2 ) Fuel Performance miles/gal 0.4251 kilometers/liter (km/L) gal/mile 2.3527 liters/kilometer (L/km) Velocity mph 1.6093 kilometers/hour (km/h) Length inch 25.4 mm foot 0.3048 m yard 0.9144 m mile 1.609 km Area square inch (in 2 ) 645.2 mm 2 6.45 cm 2 square ft (ft 2 ) 0.0929 m 2 square yard 0.8361 m 2 Volume cubic inch (in 3 ) 16387.0 mm 3 16.387 cm 3 0.0164 liters (L) quart 0.9464 liters (L) gallon 3.7854 liters(L) cubic yard 0.7646 m 3 Mass pound 0.4536 kg ton 907.18 kg ton 0.9078 tonne (t) Force kilogram 9.807 N ounce 0.2780 N pound 4.448 N Temperature degree Farenheit (˚F) (˚F-32) 0.556 degree Celsius (˚C) METRICS ENGLISH/METRIC CONVERSION Revision 1, 8/10/2000

2012-2013 Ford Focus Service & Repair Manual

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