|
| |
|
|
SAE
Grade
|
Markings
|
Tensile
PSI
|
Material
|
5/16 |
3/8 |
7/16 |
1/2 |
9/16 |
5/8 |
3/4 |
7/8 |
|
Brass
|
 |
60,000
|
Copper 63%
Zinc 37%
|
9
|
17
|
27
|
37
|
49
|
78
|
104
|
160
|
|
Stainless
|
 |
72,000
|
AISI 303
|
10
|
18
|
28
|
40
|
54
|
80
|
117
|
180
|
|
2
|
 |
74,000
|
Low
Carbon
|
12
|
20
|
32
|
47
|
69
|
96
|
155
|
206
|
|
3
|
 |
100,000 |
Medium
Carbon
|
17
|
30
|
47
|
69
|
103
|
145
|
234
|
372
|
|
5
|
 |
120,000 |
Medium
Carbon Heat
Treated
|
19
|
33
|
54
|
78
|
114
|
154
|
257
|
382
|
|
6
|
 |
133,000 |
Medium
Carbon
Tempered
|
24
|
43
|
69
|
106
|
150
|
209
|
350
|
550
|
|
7
|
 |
133,000 |
Medium
Carbon
Alloy
|
25
|
44
|
71
|
110
|
154
|
215
|
360
|
570
|
|
8
|
 |
150,000 |
Medium
Carbon
Alloy
|
29
|
47
|
78
|
119
|
169
|
230
|
380
|
600
|
|
10
|
 |
160,000 |
High
Carbon
Case Hardened
|
33
|
54
|
84
|
125
|
180
|
250
|
400
|
640
|
Safety Notes
|
These values are given in lb-ft and apply to clean
smooth lubricated threads on NEW fasteners.
The nut and washer must have equal or greater rating
then the bolt.
Consult your manual for material type
The values are for the fastener not the assembly.
Some assembles can not with stand the maximum clamping force.
The values for fine treads are slightly higher.
Compiled By Chris Klossner
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Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
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