|
|
Description:
A round washer with notches formed into its outer edge, protrusions equally spaced from each other on the top face and corresponding pockets on the bottom face.
Application:
These washers are designed to be used with grade 5 and grade 8 cap screws. The washer is placed beneath the head of the cap screw and as the screw is tightened, the protrusions compress.
When the protrusions have been flattened a sufficient amount the fastening has achieved the proper tension. Direct tension indicators are not affected by the presence of oil or other lubricants, and they measure tension regardless of surface condition. They help ensure proper tension is achieved even when a simple box wrench or socket wrench are the only tools that can be used to tighten the screw.
|
|
Tension Indicating Washer
 
ASTM F959 DIRECT TENSION INDICATOR WASHERS - USED W/TYPE 325 STRUCTURAL FASTENERS ASTM F959 |
Nominal Size |
OD |
ID |
TH |
P |
Number of
Protrusions
(equally spaced) |
Compression Load
Range (lbs.) |
Outside Diameter |
Inside Diameter |
Thickness |
Protrusion
Tangential
Diameter |
Max |
Min |
Max |
Min |
With Protrusion Max |
With Protrusion Min |
Max |
Max |
Min |
1/2 |
1.187 |
1.167 |
0.527 |
0.523 |
0.180 |
0.104 |
0.788 |
4 |
14,000 |
12,000 |
5/8 |
1.375 |
1.355 |
0.658 |
0.654 |
0.220 |
0.126 |
0.956 |
4 |
23,000 |
19,000 |
3/4 |
1.625 |
1.605 |
0.790 |
0.786 |
0.230 |
0.126 |
1.125 |
5 |
34,000 |
28,000 |
7/8 |
1.875 |
1.855 |
0.921 |
0.917 |
0.240 |
0.142 |
1.294 |
5 |
47,000 |
39,000 |
1 |
2.000 |
1.980 |
1.052 |
1.048 |
0.270 |
0.158 |
1.463 |
6 |
61,000 |
51,000 |
1-1/8 |
2.250 |
2.230 |
1.183 |
1.179 |
0.270 |
0.158 |
1.631 |
6 |
67,000 |
56,000 |
1-1/4 |
2.500 |
2.480 |
1.315 |
1.311 |
0.270 |
0.158 |
1.800 |
7 |
85,000 |
71,000 |
1-3/8 |
2.750 |
2.730 |
1.446 |
1.442 |
0.270 |
0.158 |
1.969 |
7 |
102,000 |
85,000 |
1-1/2 |
3.000 |
2.980 |
1.577 |
1.573 |
0.270 |
0.158 |
2.138 |
8 |
124,000 |
103,000 |
DIRECT TENSION INDICATORWASHERS - USED W/ GRADES 5 & 8 FASTENERS SAE J 2486 |
Nominal Size |
OD |
ID |
TH |
P |
Grade 5 Loads
|
Grade 8 Loads |
Outside Diameter |
Inside Diameter |
Thickness |
Protrusion
Bearing
Diameter |
Target Clamp Load |
Proof Load |
Target Clamp Load |
Proof Load |
Max |
Max |
Min |
|
Max |
Min |
Min |
1/2 |
0.970 |
0.527 |
0.523 |
0.104 |
0.675 |
10,197 |
12,100 |
14,396 |
17,000 |
5/8 |
1.224 |
0.658 |
0.654 |
0.126 |
0.844 |
16,317 |
19,200 |
23,036 |
27,100 |
3/4 |
1.494 |
0.790 |
0.786 |
0.142 |
1.012 |
23,776 |
28,400 |
33,567 |
40,100 |
7/8 |
1.650 |
0.921 |
0.917 |
0.158 |
1.181 |
32,449 |
39,300 |
45,825 |
55,400 |
1 |
1.866 |
1.052 |
1.048 |
0.158 |
1.350 |
42,269 |
51,500 |
59,674 |
72,700 |
1-1/8 |
2.083 |
1.183 |
1.179 |
0.158 |
1.519 |
47,508 |
56,500 |
77,040 |
91,600 |
1-1/4 |
2.299 |
1.315 |
1.311 |
0.193 |
1.688 |
59,552 |
71,700 |
96,570 |
116,300 |
1-1/2 |
2.732 |
1.577 |
1.573 |
0.193 |
2.025 |
87,746 |
104,000 |
142,290 |
169,200 |
|
Email: 
sales@fastenerz.com
Credit Accepted:
![[IMAGE: Master card credit card]](mstr_2.gif) ![[IMAGE: Visa credit card]](visa_2.gif)
|
|
