Snorkel TB125J Repair Parts Manual page 377

Capscrew torque chart
GRADE SAE GRADE SAE GRADE
BOLT 1 OR 2
MARKING
MINIMUM
INDETERMINATE
DEFINITION COMMERCIAL
QUALITY
QUALITY
LOW
MATERIAL CARBON
STEEL
TEMPERED
MIN. TENSILE
64,000 P.S.I. 105,000 P.S.I.
STRENGTH
RECOMMENDED TORQUE VALUES (FT - LBS)
BOLT SIZE
1/4 5
5/16 9
3/8 15
7/16 24
1/2 37
9/16 53
5/8 74
3/4 120
7/8 190
1 282
The following rules apply to the chart
1. Consult manufacturers' specific recommendations when available.
2. The chart may be used with both course and fine thread fasteners lightly lubricated.
3. Increase torque by 20% when multiple tapered tooth (shake proof) lock washers are used.
4. The torque values are given in foot-pounds.
5. Inch pound equivalent may be obtained by multiplying by 12.
TB125
SAE GRADE SAE GRADE
5 6 8
MEDIUM
COMMERCIAL
QUALITY
MEDIUM MEDIUM MED. CARBON
CARBON CARBON ALLOY
STEEL STEEL STEEL
Q & T Q & T
133,000 P.S.I. 150,000 P.S.I.
7 10 10.5
14 19 22
25 34 37
40 55 60
60 85 92
88 120 132
120 167 180
200 280 296
302 440 473
466 660 714
9