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GENERAL REPAIR PRACTICES
SECTION 4
CAPSCREW MARKING AND TORQUE VALUES
Usage
Much Used
Used at Times
Used at Times
Capscrew Diameter
To
3
4
- 120,000
To
5
8
- 140,000
150,000
& Minimum Tensile
To 1 - 115,000
To
3
4
- 133,000
Strength PSI
Quality of Material
Min. Commercial
Med. Commercial
Best Commercial
SAE Grade Number
5
6 or 7
8
CAPSCREW HEAD MARKINGS
Manufacturers marks may var y.
These are all SAE Grade 5 (3-line.)
Capscrew Body Size
Torque
Torque
Torque
(Inches) - (Thread)
Ft-Lb (kg m)
Ft-Lb (kg m)
Ft-Lb (kg m)
1
4
- 20
8 (1.11)
10 (1.38)
12 (1.66)
- 28
10 (1.38)
14 (1.94)
5
16
- 18
17 (2.35)
19 (2.63)
24 (3.32)
- 24
19 (2.63)
27 (3.73)
3
8
- 16
31 (4.29)
34 (4.70)
44 (6.09)
- 24
35 (4.84)
49 (6.78)
7
16
- 14
49 (6.78)
55 (7.61)
70 (9.68)
- 20
55 (7.61)
78 (10.79)
1
2
- 13
75 (10.37)
85 (11.76)
105 (14.52)
- 20
85 (11.76)
120 (16.60)
9
16
- 12
110 (15.21)
120 (16.60)
155 (21.44)
- 18
120 (16.60)
170 (23.51)
5
8
- 11
150 (20.75)
167 (23.10)
210 (29.04)
- 18
170 (23.51)
240 (33.19)
3
4
- 10
270 (37.34)
280 (38.72)
375 (51.86)
- 16
295 (40.80)
420 (58.09)
7
8
- 9
395 (54.63)
440 (60.85)
605 (83.67)
- 14
435 (60.16)
675 (93.35)
1 - 8
590 (81.60)
660 (91.28)
910 (125.85)
- 14
660 (91.28)
990 (136.92)
NOTES:
1. Always use the torque values listed above when specific torque values are not available.
2. The above is based on use of clean, dry threads.
3. Reduce torque by 10% when engine oil is used as a lubricant.
4. Reduce torque by 20% if new plated capscrews are used.
5. General Formula for calculating Torques is as follows: Torque in Inch Lbs. = .2 x Nominal Diameter of Screw x
Loads in Lbs., where Load = 80% of Yield Strength, expressed in Lbs., not pounds per square inch.
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4-6
Summary of Contents for LEACH 2R-III
Page 2: ......
Page 8: ......
Page 26: ...SECTION 2 2 8 ...
Page 28: ...OPERATION SECTION 3 LOCATION OF OPERATING CONTROLS 3 2 4 6 5 7 8 1 2 3 8 9 10 11 12 7 ...
Page 46: ...SECTION 3 3 20 ...
Page 54: ...SECTION 4 4 8 ...
Page 60: ...SECTION 6 6 4 PREVENTIVE MAINTENANCE 1 2 3 4 5 6 7 8 ...
Page 62: ...SECTION 6 6 6 ...
Page 76: ...SECTION 7 7 10 ...