| |
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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Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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