The Earnest Machine Products line of #3 Dome Scraper Bolts are manufactured to a higher hardness and strength (170,000 psi) than our standard Grade 8 line to provide additional wear resistance for demanding scraper blade applications. The head design is the same as our grade 8 line to fit in all # 3 Head plow bolt applications. The domed head design provides added ease of assembly and greater resistance to failure in service as compared to a standard flat head design.
- Higher hardness and strength along the domed head provides added wear resistance.
- Specialized head diameter provides for a tighter fit in countersunk holes.
- Head design will fit in all applications designed for # 3 head bolts
- 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.
170M head marking ensures the highest strength and best wear resistance.
- 170,000 psi minimum Tensile Strength
- 140,000 psi min Proof Load Strength
- Hardness Rc 37/42
Part 1 of 2
| Size |
Head Diameter |
Body Dia. |
Dome
Hgt |
Feed Thick |
Width of Square |
| A |
D |
E |
F |
G |
| Sharp |
Max |
Min |
Max |
Min |
Max |
Max |
Min |
Max |
Min |
| 5/8 – 11 |
1.197 |
1.044 |
1.013 |
.625 |
.611 |
.10 |
.120 |
.050 |
.640 |
.625 |
| 3/4 – 10 |
1.488 |
1.200 |
1.169 |
.750 |
.735 |
.11 |
.160 |
.090 |
.765 |
.750 |
| 7/8 – 9 |
1.745 |
1.409 |
1.369 |
.875 |
.859 |
.11 |
.170 |
.100 |
.906 |
.875 |
| 1 – 8 |
1.933 |
1.597 |
1.557 |
1.000 |
.983 |
.12 |
.170 |
.100 |
1.031 |
1.000 |
| 1 1/8 – 7 |
- |
1.910 |
1.790 |
1.125 |
1.098 |
.18 |
.160 |
.120 |
1.160 |
1.125 |
| 1 1/4 - 7 |
- |
2.087 |
1.969 |
1.250 |
1.223 |
.19 |
.180 |
.140 |
1.290 |
1.250 |
| 1 3/8 – 6 |
- |
2.323 |
2.205 |
1.375 |
1.345 |
.22 |
.200 |
.160 |
1.421 |
1.370 |
| 1 1/2 – 6 |
- |
2.520 |
2.401 |
1.500 |
1.470 |
.25 |
.200 |
.160 |
1.559 |
1.496 |
Part 2 of 2
| Size |
Depth of Square |
Fillet Rad |
Corner Rad |
Transition
Angle |
| S |
FR |
CR |
N |
| Max |
Min |
Max |
Min |
Max |
Min |
Nominal |
| 5/8 – 11 |
.516 |
.466 |
.062 |
.015 |
.094 |
.030 |
30 |
| 3/4 – 10 |
.581 |
.541 |
.125 |
.031 |
.109 |
.030 |
30 |
| 7/8 – 9 |
.663 |
.613 |
.125 |
.031 |
.125 |
.050 |
30 |
| 1 – 8 |
.737 |
.677 |
.125 |
.031 |
.141 |
.050 |
30 |
| 1 1/8 – 7 |
.810 |
.765 |
.125 |
.031 |
.156 |
.062 |
30 |
| 1 1/4 - 7 |
.945 |
.892 |
.177 |
.062 |
.172 |
.062 |
30 |
| 1 3/8 – 6 |
1.063 |
1.010 |
.177 |
.062 |
.187 |
.062 |
30 |
| 1 1/2 – 6 |
1.181 |
1.122 |
.177 |
.062 |
.203 |
.078 |
30 |
| 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 |
| Max |
Min |
Max |
Min |
Max |
Max |
Max |
Min |
Max |
Min |
Min |
Max |
Nom |
| 1 1/4 – 7 |
2.028 |
1.988 |
1.327 |
1.307 |
.118 |
.246 |
1.358 |
1.327 |
1.055 |
.992 |
.094 |
30 |
30 |
| Part Number |
Size |
Length |
Thread |
| max |
min |
| 196220 |
1 1/4 – 7 x 4 |
2.125” |
1.750” |
| 196228 |
1 1/4 7 x 4 1/8 |
2.250” |
1.875” |
| 196240 |
1 1/4 – 7 x 4 1/2 |
2.250” |
2.250” |
| 196248 |
1 1/4 – 7 x 4 15/16 |
2.280” |
2.657” |
| 196298 |
1 1/4 – 7 x 5 1/2 |
2.750” |
2.750” |