No. 3 DOME HEAD PLOW BOLT
The Earnest Machine Products line of #3 Dome Head Plow Bolts are specially designed to provide added ease of assembly and greater resistance to failure in service as compared to a standard flat head design.
- Thicker domed head provides greater wear resistance.
- Specialized head diameter provide for a tighter fit in countersunk holes
- Head design will fit into all applications designed for # 3 Heads.
- Deeper depth of square provides fuller engagement.
- Smaller transition angle on the corners of the square provides for a greater resistance against spinning in the hole during installation.
- Tighter tolerance on the body diameter for sizes 5/8 and larger, minimizes the potential of the bolt moving in the hole, which can result in the assembly coming loose and causing rounding out of the installation holes.
Two strength levels are available (depending on size and availability):
- Grade 5 (per SAE J429) -120,000 psi minimum Tensile Strengt
Standard Duty, Good Strength to Toughness Ratio
- Grade 8 (per SAE J429) - 150,000 psi minimum Tensile Strength
Heavy Duty, Best Strength to Toughness Ratio
| Size |
Head
Diameter |
Body Dia. |
Dome Hgt |
Feed Thick |
Width of Square |
Depth of Square |
Fillet Rad |
Corner Rad |
Transition Angle |
|
A |
D |
E |
F |
G |
S |
FR |
CR |
N |
|
Sharp |
Max |
Min |
Max |
Min |
Max |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Nominal |
| 1/2 – 13 |
.945 |
.890 |
.875 |
.500 |
.483 |
- |
.042 |
- |
.515 |
.500 |
.417 |
.375 |
.062 |
- |
.047 |
- |
30° |
| 5/8 – 11 |
1.197 |
1.044 |
1.013 |
.625 |
.611 |
.10 |
.120 |
.050 |
.640 |
.625 |
.516 |
.466 |
.062 |
.015 |
.094 |
.030 |
30° |
| 3/4 – 10 |
1.488 |
1.200 |
1.169 |
.750 |
.735 |
.11 |
.160 |
.090 |
.765 |
.750 |
.581 |
.541 |
.125 |
.031 |
.109 |
.030 |
30° |
| 7/8 – 9 |
1.745 |
1.409 |
1.369 |
.875 |
.859 |
.11 |
.170 |
.100 |
.906 |
.875 |
.663 |
.613 |
.125 |
.031 |
.125 |
.050 |
30° |
| 1 – 8 |
1.933 |
1.597 |
1.557 |
1.000 |
.983 |
.12 |
.170 |
.100 |
1.031 |
1.000 |
.737 |
.677 |
.125 |
.031 |
.141 |
.050 |
30° |
| 1 1/8 – 7 |
- |
1.910 |
1.790 |
1.125 |
1.098 |
.18 |
.160 |
.120 |
1.160 |
1.125 |
.810 |
.765 |
.125 |
.031 |
.156 |
.062 |
30° |
| 1 1/4 - 7 |
- |
2.087 |
1.969 |
1.250 |
1.223 |
.19 |
.180 |
.140 |
1.290 |
1.250 |
.945 |
.892 |
.177 |
.062 |
.172 |
.062 |
30° |
| 1 3/8 – 6 |
- |
2.323 |
2.205 |
1.375 |
1.345 |
.22 |
.200 |
.160 |
1.421 |
1.370 |
1.063 |
1.010 |
.177 |
.062 |
.187 |
.062 |
30° |
| 1 1/2 – |
- |
2.520 |
2.401 |
1.500 |
1.470 |
.25 |
.200 |
.160 |
1.559 |
1.496 |
1.181 |
1.122 |
.177 |
.062 |
.203 |
.078 |
30° |
EMP Dome Head Plow Bolt Tolerances
|
Size
|
Head Diameter
|
Body Dia.
|
Depth of Square
|
WAF Square
|
Feed Thick
|
Corner Radius
|
Transition Angle
|
|
A
|
D
|
S
|
G
|
F
|
CR
|
N
|
|
Max
|
Min
|
Max
|
Min
|
Max
|
Min
|
Max
|
Min
|
Max
|
Min
|
Max
|
Min
|
Nominal
|
|
5/8 – 11
|
1.044
|
1.013
|
.625
|
.611
|
.516
|
.466
|
.640
|
.625
|
.120
|
.050
|
.094
|
.030
|
30°
|
|
3/4 – 10
|
1.200
|
1.169
|
.750
|
.735
|
.581
|
.541
|
.765
|
.750
|
.160
|
.090
|
.109
|
.030
|
30°
|
|
7/8 – 9
|
1.409
|
1.369
|
.875
|
.859
|
.663
|
.613
|
.906
|
.875
|
.170
|
.100
|
.125
|
.050
|
30°
|
|
1 – 8
|
1.597
|
1.557
|
1.000
|
.983
|
.737
|
.677
|
1.031
|
1.000
|
.170
|
.100
|
.141
|
.050
|
30°
|
|
1 1/8 – 7
|
1.910
|
1.790
|
1.125
|
1.098
|
.810
|
.765
|
1.160
|
1.125
|
.160
|
.120
|
.156
|
.062
|
30°
|
|
1 1/4 - 7
|
2.087
|
1.969
|
1.250
|
1.223
|
.945
|
.892
|
1.290
|
1.250
|
.180
|
.140
|
.172
|
.062
|
30°
|
|
1 3/8 – 6
|
2.323
|
2.205
|
1.375
|
1.345
|
1.063
|
1.010
|
1.421
|
1.370
|
.200
|
.160
|
.187
|
.062
|
30°
|
|
1 1/2 – 6
|
2.520
|
2.401
|
1.500
|
1.470
|
1.181
|
1.122
|
1.559
|
1.496
|
.200
|
.160
|
.203
|
.078
|
30°
|
Earnest stocks the Dome Head style in sizes 5/8 and larger. Sizes below 5/8 are available by special order.