Sears TRACT Manual Del Operador página 108

Hardware Identification & Torque Specifications
Common Hardware Types
Hex Head Capscrew
Carriage Bolt
Standard Hardware Sizing
When a washer or nut is identified as 1/2", this is the
Nominal size , meaning the inside diameter is 1/2 inch; if a
second number is present it represent the threads per inch
When bolt or capscrew is identified as 1/2 - 16 x 2", this
means the Nominal size , or body diameter is 1/2 inch; the
second number represents the threads per inch (16 in this
example, and the final number is the body length of the
bolt or screw (in this example 2 inches long).
The guides and ruler furnished below are designed to
help you select the appropriate hardware and tools.
Screw, 1/2 x 2
Body
Diameter
Body
Length
Wrench & Fastener Size Guide
1/4
1/4" Bolt or Nut 5/16" Bolt or Nut
Wrench—7/16"
Washer
Lockwasher
Hex Nut
Nut, 1/2"
Inside
Diameter
5/16
3/8" Bolt or Nut
Wrench—1/2" Wrench—9/16"
PTS - 36
Torque Specification Chart
FOR STANDARD MACHINE HARDWARE (Tolerance ± 20%)
No
Hardware
Marks
Grade
SAE Grade 2
Size Of in/lbs
Hardware ft/lbs Nm.
19
8-32 2.1
8-36 20 2.3
10-24 27 3.1
31
10-32 3.5
1/4-20 66 7.6
1/4-28 76 8.6
5/16-18 11 15.0
5/16-24 12 16.3
3/8-16 20 27.2
3/8-24 23 31.3
7/16-14 30 40.8
7/16-20 35 47.6
1/2-13 50 68.0
1/2-20 55 74.8
9/16-12 65 88.4
9/16-18 75 102.0
5/8-11 90 122.4
5/8-18 100 136
3/4-10 160 217.6
3/4-16 180 244.8
7/8-9 140 190.4
7/8-14 155 210.8
1-8 220 299.2
1-12 240 326.4
1. These torque values are to be used for all hardware
excluding: locknuts, self-tapping screws, thread forming
screws, sheet metal screws and socket head setscrews.
2. Recommended seating torque values for locknuts:
a. for prevailing torque locknuts - use 65% of grade 5
torques.
b. for flange whizlock nuts and screws - use 135% of
grade 5 torques.
3. Unless otherwise noted on assembly drawings, all torque
values must meet this specification.
7/16
3/8
DIA.
7/16" Bolt or Nut
Wrench (Bolt)—5/8"
Wrench (Nut)—11/16"
SAE Grade 5 SAE Grade 8
in/lbs in/lbs
ft/lbs Nm. ft/lbs Nm.
30 41
3.4
31 3.5 43
43 4.9 60
49 68
5.5
8 10.9 12 16.3
10 13.6 14 19.0
17 23.1 25 34.0
19 25.8 27 34.0
30 40.8 45 61.2
35 47.6 50 68.0
50 68.0 70 95.2
55 74.8 80 108.8
75 102.0 110 149.6
90 122.4 120 163.2
110 149.6 150 204.0
120 163.2 170 231.2
150 204.0 220 299.2
180 244.8 240 326.4
260 353.6 386 525.0
300 408.0 420 571.2
400 544.0 600 816.0
440 598.4 660 897.6
580 788.8 900 1,244.0
640 870.4 1,000 1,360.0
NOTES
1/2
DIA.
1/2" Bolt or Nut
Wrench—3/4"
4.6
4.9
6.8
7.7