ASTM F959 Specification
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ASTM F959 covers the requirements for compressible washer type direct tension indicators in diameters ranging from 1/2” to 1-1/2” inclusive. These washers are capable of indicating the achievement of a specified minimum bolt tension. They are available in two grades for use with A325 and A490 structural bolts and are also available in a weathering steel option for both grades.
We at JF Engg Manufacture Washers in F959 Specification and are stocked in mechanical galvanized and hot-dipped galvanized condition. We can provide these fasteners with minimal Delivery Schedule.
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F959 Types
| Type 325 and 325-3 | For use with A325, F1852 and A325-3, F1852-3 structural bolts |
|---|---|
| Type 490 and 490-3 | For use with A490, F2280 and A490-3, F2280-3 structural bolts |
F959 Acceptable Compression Load Range
Diameter |
Type 325 and 325-3, in kips |
Type 490 and 490-3, in kips |
|---|---|---|
1/2 |
12 – 14 |
15 – 18 |
5/8 |
19 – 23 |
24 – 29 |
3/4 |
28 – 34 |
35 – 42 |
7/8 |
39 – 47 |
49 – 59 |
1 |
51 – 61 |
64 – 77 |
1-1/8 |
56 – 67 |
80 – 96 |
1-1/4 |
71 – 85 |
102 – 122 |
1-3/8 |
85 – 102 |
121 – 145 |
1-1/2 |
103 – 124 |
148 – 178 |
F959 Chemical Requirements, Heat Analysis
Element |
Type 325 and 490 |
Type 325-3 and 490-3 |
|---|---|---|
Carbon |
0.30 - 0.55% |
|
Manganese |
0.50 – 0.90% |
|
Phosphorous, max |
0.040% |
0.040% |
Sulfur, max |
0.045% |
0.050% |
Silicon |
0.15 – 0.35% |
0.15 – 0.35% |
Chromium |
0.45 – 0.65% |
|
Nickel |
0.25 – 0.45% |
|
Copper |
0.25 – 0.45% |
|
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