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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.
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%
Weathering steel DTIs may also be made from any of the type 3 steels listed in A325 and F436
Weathering Steel DTIs having Copper, Sulfur, and Phosphorous conforming to the above, and having a Corrosion Resistance Index of 6 or higher calculated on the basis of the heat analysis as described in Guide 101 Predictive Method based on the data of Larabee and Coburn shall be considered acceptable.
Astm F959 Washer Application Industries
Sunflex Metal Industries are engaged in manufacturing of robust quality of Astm F959 Washer. These Astm F959 Washer are widely used in the following industries:
Mining Industries Transport Industries- Rail and Road Construction Industries / Building Systems Manufacturing Industries Agriculture Industries Energy Industries Water Industries Automotive Industries Ship Building Industries Nuclear Power Plant Paper & Pulp Industries Sugar Industries Engineering Cement Industries Petro-Chemical Industries Food Industries Oil & Gas Industries Chemical & Pharmaceutical Industries
Mining Industries
