F959M

Compressible washer type direct tension indicators (DTIs) in diameters 1/2 to 1-1/2 inches

F959M

TABLE 1 Chemical Requirements

Element

Composition %,
Type 8.8 and Type 10.9 Type 8.8-3 and Type 10.9-3*
Carbon 0.27–0.58 ...
Manganese 0.47–0.93  
Phosphorus max 0.048 0.045
Sulfur max 0.053 0.055
Silicon: 0.13–0.37 0.13-0.37
Copper: 0.22-0.48
Nickel: 0.22-0.48
Chromium: 0.42–0.68

 

*Weathering steel DTIs are also permitted to be manufactured from any of the Type 3 steels in the chemical composition sections of Speciļ¬cationsA325M and F436M.

TABLE 3 Acceptable Range of Compression Loads

 

Direct Tension Indicator Size Compression Load Range, kN
(Nominal Diameter, mm) Type 8.8 Type 10.9
M16 91–109 114–131
M20 142–170 179–206
M22 176–211 221–254
M24 205–246 257–296
M27 267–320 334–384
M30 326–391 408–469
M36 475–570 595–684

 

TABLE 4 Dimensions of Direct Tension Indicators

Direct Tension Indicator Size
(Nominal Diameter, mm)A

Type 8.8 Type 10.9 All Types
Outside Diameter
(OD), mm
Number of
Protrusions
(Equally
Spaced)
Thickness, mm Outside Diameter
(OD), mm
Number of
Protrusions
(Equally
Spaced)
Thickness, mm Inside Diameter (ID) ,
mm
Uncoated
Protrusion
Tangential Diameter
(PTD), max, mm
(see Fig. 1)
min max   Without , Protrusionmin With
Protrusion max
min max   Without , Protrusionmin With
Protrusion max
min max  
M16 35.2 36.8 4 3.2 5.5 35.2 36.8 4 3.6 6.0 16.75 16.85 25
M 20 44.0 46.0 5 3.6 6.0 44.0 46.0 6 3.60 6.0 20.95 21.05 29.00
M 22 48.4 50.6 5 3.6 6.0 48.4 50.6 6 4.00 7.0 23.05 23.15 33.00
M 24 52.8 55.2 5 4.0 7.0 52.8 55.2 6 4.00 7.0 25.15 25.25 38.00
M 27 59.4 62.1 6 4.0 7.0 59.4 62.1 7 4.00 7.0 28.30 28.40 43.00
M 30 66.0 69.0 7 4.0 7.0 66.0 60.0 8 4.80 7.5 31.45 31.55 46.50
M 36 79.2 82.8 8 4.8 7.5 79.2 82.8 9 4.80 7.5 37.75 37.85 56.00