DuraSquirt DTI Washer, Galvanized
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DuraSquirt DTI Washer, Galvanized

ASTM F959, Type A325 DuraSquirt Direct Tension Indicator (DTI) washers are used to indicate the correct bolt tension when an A325 structural bolt is installed. The DuraSquirt DTI is placed under a hardened surface such as a bolt head, nut, or hardened washer, with the bumps facing away from the structural steel. As the bolt is tensioned, the clamping force flattens the bumps, reducing the gap which causes a colored silicone material to squirt out, giving the visual indication that the bolt has reached its proper tension. DuraSquirt washers provide all the same advantages as the standard Squirter washer, but have the added benefit of the silicone used being designed to withstand exposure to the elements. Dimensional specifications are governed by ASME B18.2.6. Available in mechanical galvanized finish, which provides a corrosion resistant zinc coating.

Governing StandardsDuraSquirt DTI Washer

ASTM F959 Covers the requirements for compressible-washer-type direct tension indicators capable of indicating the achievement of a specified minimum bolt tension in a structural bolt.
ASME B18.2.6 Covers the general and dimensional data for five products in the inch series recognized as American National Standard. These five structural products include: (a) Heavy Hex Structural Bolts: ASTM A325 or ASTM A490; (b) Heavy Hex Nuts: ASTM A563; (c) Hardened Steel Washers; Circular, Circular Clipped or Beveled: ASTM F436; (d) Compressible Washer-Type Direct Tension Indicators: ASTM F959; (e) Twist-Off-Type Tension Control Structural Bolts: Heavy Hex and Round: ASTM F1852.

Mechanical PropertiesDuraSquirt DTI Washer

Per ASTM F959-2009
Acceptable Range of
Compression Loads
Size Type A325
(1000 lbs)
1/2 12-14
5/8 19-23
3/4 28-34
7/8 39-47
1 51-61
1 1/8 56-67
1 1/4 71-85
1 3/8 85-102
1 1/2 103-124

Chemical PropertiesDuraSquirt DTI Washer

Per ASTM F959-2009
Grade Carbon Manganese Phosphorus Sulfur Silicon
% by weight % by weight % by weight % by weight % by weight
DTI - Type 325 0.30-0.55 0.50-0.90 0.04 0.045 0.15-0.35

Dimensional SpecificationsDuraSquirt DTI Washer

Direct Tension Indicator washer dimensions
Per ASME B18.2.6-2011
Size A B C Number of
Protrusions
(Equally
Spaced)
E F
Inside
Diameter
Protrusion
Tangential
Diameter
Outside
Diameter
Thickness
Without
Protrusion
With
Protrusion
Min Max Max Min Max Min Max
1/2 0.523 0.527 0.788 1.167 1.187 4 0.104 0.180
5/8 0.654 0.658 0.956 1.355 1.375 4 0.126 0.220
3/4 0.786 0.790 1.125 1.605 1.625 5 0.126 0.230
7/8 0.917 0.921 1.294 1.855 1.875 5 0.142 0.240
1 1.048 1.052 1.463 1.980 2.000 6 0.158 0.270
1 1/8 1.179 1.183 1.631 2.230 2.250 6 0.158 0.270
1 1/4 1.311 1.315 1.800 2.480 2.500 7 0.158 0.270
1 3/8 1.442 1.446 1.969 2.730 2.750 7 0.158 0.270
1 1/2 1.573 1.577 2.138 2.980 3.000 8 0.158 0.270
  1. All dimensions are in inches.
DuraSquirt DTI Washer, Galvanized
View
Diameter Inside Diameter Outside Diameter Thickness Item # Availability Price Quantity UOM
5/8 0.6650 1.3130 0.1220 WLOD062DSQ-U In Stock $1.29022/EA EA
3/4 0.79 1.4680 0.1220 WLOD075DSQ-U In Stock $1.5514/EA EA
7/8 0.9150 1.75 0.1360 WLOD087DSQ-U In Stock $1.86895/EA EA
1 1.04 2.0 0.1360 WLOD100DSQ-U In Stock $1.99904/EA EA
1 1/8 1.1650 2.25 0.1360 WLOD112DSQ-U In Stock $2.87203/EA EA
1 1/4 1.29 2.5 0.1360 WLOD125DSQ-U In Stock $3.08559/EA EA
1 3/8 1.4150 2.75 0.1360 WLOD137DSQ-U 5-7 Working Days $4.23217/EA EA