Dodge ZB 2005 - Page 7

FASTENER IDENTIFICATION
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 9.8 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 the Fastener Identification and
Fastener Strength Charts.
BOLT MARKINGS AND TORQUES - METRIC
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* 14 120* 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
16 243 180 324 210 324 240
* Inch Lbs.
BOLT MARKINGS AND TORQUES - U. S. CUSTOMARY
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*
3/8-1640305540
3/8-2447356045
7/16-1468508865
7/16-2074559570
1/2 - 13 101 75 135 100
1/2 -20 115 85 150 110
9/16 - 12 135 105 182 135
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.
2 INTRODUCTION ZB