DESCRIPTION
The SAE bolt strength grades range from grade 2 to grade 8. The higher the grade number, the greater the bolt strength. Identification is determined by the line marks on the top of each bolt head. The actual bolt strength grade corresponds to the number of line marks plus 2. The most commonly used metric bolt strength classes are 8.9 and 10.9. The metric strength class identification number is imprinted on the head of the bolt. The higher the class number, the greater the bolt strength. Some metric nuts are imprinted with a single-digit strength class on the nut face. Refer to BOLT MARKINGS AND TORQUES - METRIC, BOLT MARKINGS AND TORQUES - U. S. CUSTOMARY and (Scheme 1).
| BOLT MARKINGS | 8.8/8.9 | 10.9 | 12.9 | |||
|---|---|---|---|---|---|---|
| BOLT DIA. | N.M | FT. LBS. | N.M | FT. LBS. | N.M | FT. LBS. |
| 6 | 12 | 105* | 14 | 125* | 16 | 12 |
| 8 | 25 | 250* | 32 | 23 | 38 | 28 |
| 10 | 54 | 40 | 60 | 45 | 74 | 55 |
| 12 | 95 | 70 | 108 | 80 | 135 | 100 |
| 14 | 155 | 115 | 175 | 130 | 216 | 160 |
| 16 | 243 | 180 | 324 | 240 | 324 | 240 |
| * Inch Lbs. | ||||||
BOLT MARKINGS AND TORQUES - METRIC
| BOLT MARKINGS | GRADE 5 | GRADE 8 | ||
|---|---|---|---|---|
| BOLT DIA. | N.M | FT. LBS. | N.M | FT. LBS. |
| 1/4 - 20 | 10 | 95* | 14 | 125* |
| 1/4 - 28 | 10 | 95* | 17 | 150* |
| 5/16 - 18 | 22 | 200* | 30 | 270* |
| 5/16 - 24 | 26 | 240* | 33 | 300* |
| 3/8 - 16 | 40 | 30 | 55 | 40 |
| 3/8 - 24 | 47 | 35 | 60 | 45 |
| 7/16 - 14 | 68 | 50 | 88 | 65 |
| 7/16 - 20 | 74 | 55 | 95 | 70 |
| 1/2 - 13 | 101 | 75 | 135 | 100 |
| 1/2 - 20 | 115 | 85 | 150 | 110 |
| 9/16 - 12 | 135 | 100 | 182 | 135 |
| 9/16 - 18 | 155 | 115 | 202 | 150 |
| 5/8 - 11 | 202 | 150 | 263 | 195 |
| 5/8 - 18 | 215 | 160 | 284 | 210 |
| 3/4 - 10 | 230 | 170 | 297 | 220 |
| 3/4 - 16 | 236 | 175 | 304 | 225 |
| 7/8 - 14 | 405 | 300 | 540 | 400 |
| * Inch Lbs. | ||||
BOLT MARKINGS AND TORQUES - U. S. CUSTOMARY
Scheme 1
Note. The Vehicle Emission Control Information (VECI) label(s) must be in place for the life of the vehicle. When replacing the component in which the VECI label is adhered, a new VECI label must also be adhered to the new component.
All models have a VECI Label. Chrysler permanently attaches the label in the engine compartment. It cannot be removed without defacing information and destroying the label.
The label contains the vehicle's emission specifications and vacuum hose routings. All hoses must be connected and routed according to the label.
Scheme 2
| MULTIPLY | BY | TO GET | MULTIPLY | BY | TO GET |
|---|---|---|---|---|---|
| In-lbs | X 0.11298 | = Newton Meters (N.m) | N.m | X 8.851 | = in-lbs |
| Ft-lbs | X 1.3558 | = Newton Meters (N.m) | N.m | X 0.7376 | = ft-lbs |
| Inches Hg (60° F) | X 3.377 | = Kilopascals (kPa) | KPa | X 0.2961 | = Inches Hg |
| Psi | X 6.895 | = Kilopascals (kPa) | KPa | X 0.145 | = psi |
| Inches | X 25.4 | = Millimeters (mm) | Mm | X 0.03937 | = Inches |
| Feet | X 0.3048 | = Meters (M) | M | X 3.281 | = Feet |
| Yards | X 0.9144 | = Meters (M) | M | X 1.0936 | = Yards |
| Mph | X 1.6093 | = Kilometers/Hr. (Km/h) | Km/h | X 0.6214 | = mph |
| Feet/Sec | X 0.3048 | = Meters/Sec (M/S) | M/S | X 3.281 | = Feet/Sec |
| Mph | X 0.4470 | = Meters/Sec (M/S) | M/S | X 2.237 | = mph |
| Kilometers/Hr. (Km/h) | X 0.27778 | = Meters/Sec (M/S) | M/S | X 3.600 | Kilometers/Hr. (Km/h) |
CONVERSION FORMULAS AND EQUIVALENT VALUES
| COMMON METRIC EQUIVALENTS | |
|---|---|
| 1 inch = 25 Millimeters | 1 Cubic Inch = 16 Cubic Centimeters |
| 1 Foot = 0.3 Meter | 1 Cubic Foot = 0.03 Cubic Meter |
| 1 Yard = 0.9 Meter | 1 Cubic Yard = 0.8 Cubic Meter |
| 1 Mile = 1.6 Kilometers | |