49 - PlowBolts

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Earnest Technical Bulletin 
#3 Domed Head Plow Bolt
Standard Thread and Body Length
Cleveland • Atlanta • Indianapolis • England EarnestMachine.com 800.327.6378
Domed Head Designs Supplied 
 by Earnest (per Cat 1E44)
 Flat Head
(per ASME B18.9)
Industry practice is to call a # 3 head plow bolt that is made to the dimensional requirements of ASME B18.9 
as a “flat” head design and to call a plow bolt that is made to the heavy duty head design specified by the 
Caterpillar standard 1E44 as a “domed” head design. 
The expression “domed” head is more than the presence of the bump or domed area that is on the top of the 
head. The height of the entire head is heavier and the length of the square is more substantial on a “domed” 
head as compared to a “flat” head design. 
Different manufacturers have different heights that they make the “domed” bump on top of the head to but the 
overall head and square thickness must meet the Cat standard. Some manufacturers will make the height of the 
dome more substantial and the feed thickness (the side height on the OD of the head) a little smaller. Some 
manufacturers will make the “domed” portion relatively small and make the feed thickness heavier. 
Domed Head
 with small dome height 
 large feed thickness
Domed Head
 with large dome height 
 small feed thickness
Feed
Thickness
Dome HeightDome Height
Feed
Thickness
Head
Thickness
Head
Thickness
Dome Head Plow Bolts are designed to provide added ease of assembly and greater resistance to failure in 
service as compared to a standard flat head design. A domed head style is designed to be interchangeable in 
any application that is using a flat head style with the following added benefits: 
• Thicker domed head provides greater wear resistance.
• Specialized head diameter provide for a tighter fit in countersunk holes.
• 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 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.
Size 
Head Diameter Body Dia. 
Dome 
Hgt 
Feed 
Thick 
Width of 
Square 
Depth of Head 
&Square 
Fillet Rad Corner Rad 
Transition 
Angle 
A D E F G S FR CR N 
Max Min Max Min Max Min Max Min Max Min Max Min Max Min Nominal 
5/8 – 11 1.044 1.013 .625 .611 .10 .050 .640 .625 .516 .466 .062 .015 .094 .030 30° 
3/4 – 10 1.200 1.169 .750 .735 .11 .090 .765 .750 .581 .541 .125 .031 .109 .030 30° 
7/8 – 9 1.409 1.369 .875 .859 .11 .100 .906 .875 .663 .613 .125 .031 .125 .050 30° 
1 – 8 1.597 1.557 1.000 .983 .12 .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 .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 .140 1.290 1.250 .945 .892 .177 .062 .172 .062 30° 
 Earnest Technical Bulletin 
Flat Head vs Dome Head
Plow Bolts
Cleveland • Atlanta • Indianapolis • England EarnestMachine.com 800.327.6378
The term “plow bolt” can mean something different to different people. Over the years several head designs have been 
used to attach a blade to a plow and have been called plow bolts. These different head styles have been given numbers 
(#1 head, #2 head, #3 head, etc) to differentiate the different head designs. 
In today’s market, the most commonly used head style is the “# 3 Head”, so today when someone ask for a “plow bolt” we 
assume they are asking for the # 3 head. 
Manufacturers of # 3 head plow bolts typically make the larger diameter sizes (5/8 and larger) with a heavy duty head 
that is commonly called a “domed” head. The smaller diameters (1/2” and less) are made with what is called a 
“regular” or “flat” head style. 
The # 3 Domed Head style is the most popular style used for larger snow plows (as used by highway departments) and 
for earthmoving equipment. For small plow applications the “carriage” bolt head design is the most common one used 
Note also that different industries can use different names for this same item. Earthmoving equipment manufactures 
call these bolts “cutting blade bolts”, “scraper blade bolts” or “ground engagement hardware bolts”. 
Shown below are the different head styles that have been used in “plow” applications over the years. 
(non−designated) 
 Clipped Head
 No. 11
Chattanooga Head
 No. 8
 Contour Head
(Elliptical Head)
 No. 4
Square Head
 No. 6
Large Key Head
 No. 3
Flat Round Head Square Neck
 No. 2
Round Head
 No. 1
Key Head
 No. 3
Domed Round Head Square Neck
 (Scraper Blade Bolt)
 No. 7
 Reverse Key Head
(Bucket Tooth Bolt)
 Earnest Technical Bulletin 
Plow Bolt Head Designs
Cleveland • Atlanta • Indianapolis • England EarnestMachine.com 800.327.6378
An “oversized head” plow bolt is a plow bolt that has a larger head size than is standard for the thread size. 
 Example: For the 3/8 – 16 size, the threads are 3/8 – 16 but the head is the size that would 
 be found on a standard 7/16” plow bolt. 
The “Oversized Head˜ design is used in applications where the blade is manufactured to accept a larger head size 
than the hole drilled in the mold board of the blade (example: blade has a 1/2” square punched into it but mold 
board has a 7/16 hole drilled in it). The increased engagement area of the head helps to distribute the forces, which 
are encountered in use, over a larger area to prevent damage to the blade and the engagement hole. The larger head 
diameter provides a greater wear area for increased life. 
“Oversized Head˜ Plow Bolts come threaded to the head to fit a variety of grip ranges. 
E5
L
 Earnest #3 Oversized Head Plow Bolt Tolerances 
Size 
(Thread 
Dia) 
Head Diameter Depth of 
Square 
Width of 
Square 
Corresponding 
Plow Bolt Head 
Size 
A S B 
Max Min 
Sharp 
Min Max Min Max Min 
3/8 – 16 7/16” Head Size .826 .781 .766 .364 .328 .450 .438 
7/16 – 14 1/2” Head Size .945 .890 .875 .417 .375 .515 .500 
 Note that the Oversized Head style is not the same as the “Repair˜ style listed in ANSI B18.9. 
 Compared to a Standard #3 Head Plow Bolt 
 Dimension that a standard #3 head plow bolt is made to (per ANSI B18.9 – Regular Series) 
Size 
Head Diameter Depth of Square Width of Square 
A S B 
Max Min 
Sharp 
Min Max Min Max Min 
3/8 – 16 .708 .671 .656 .312 .281 .387 .375 
7/16 – 14 .826 .781 .766 .364 .328 .450 .438 
1/2 – 13 .945 .890 .875 .417 .375 .515 .500 
 Earnest Technical Bulletin 
#3 Oversized Flat Head Plow Bolts 
Grade 5
Cleveland • Atlanta • Indianapolis • England EarnestMachine.com 800.327.6378
Earnest Machine Products line of #3 Head Plow Bolts in sizes 3/8 to 5/8 diameters are 
manufactured to the dimensions specified by ASME/ANSI B18.9 for Regular Head Series. 
Max Thread Length
CR
Min Thread Length
Length
 ASME/ANSI B18.9 Plow Bolts – # 3 Flat Head Tolerances (Regular Head Series) 
 Size 
Head 
Diameter 
Width of 
Square 
Feed 
Thick 
Head 
Thickness 
Corner 
Rad 
A B F S CR 
Max Min Max Min Max Min Max Min Max 
3/8 – 16 .708 .656 .387 .375 .031 .000 .312 .281 .047 
7/16 – 14 .826 .766 .450 .438 .036 .000 .364 .328 .047 
1/2 – 13 .945 .875 .515 .500 .042 .000 .417 .375 .047 
5/8 – 11 1.147 1.063 .640 .625 .050 .000 .506 .456 .078 
 Earnest also stocks the Dome Head style in sizes 5/8 and larger. 
The thread lengths for Earnest line of plow bolts in these sizes will have a minimum thread length of 2 x 
Dia + 1/4 to a maximum thread length of threaded to the head. 
 Flat Head Plow Bolt Thread Lengths 
Overall 
Length 
Thread Length per Bolt Diameter 
3/8 7/16 1/2 5/8 
Min Max Min Max Min Max Min Max 
1 T to H - T to H - T to H - T to H - 
1 1/4 T to H - T to H - T to H - T to H - 
1 1/2 1 T to H T to H - T to H - T to H - 
1 3/4 1 T to H 1 1/8 T to H 1 1/4T to H T to H - 
2 1 T to H 1 1/8 T to H 1 1/4 T to H T to H - 
 2 1/4 1 T to H 1 1/8 T to H 1 1/4 T to H 1 1/2 T to H 
2 1/2 1 T to H 1 1/8 T to H 1 1/4 T to H 1 1/2 T to H 
2 3/4 1 T to H 1 1/8 T to H 1 1/4 T to H 1 1/2 T to H 
3 to 6 1 T to H 1 1/8 T to H 1 1/4 T to H 1 1/2 T to H 
 T to H = Threaded to Head 
Earnest Technical Bulletin 5/2/12 
#3 Regular Flat Head Plow Bolt 
EMP
SP 1
170M
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
Fr
CR
IP
1 M7
D
A
Min Thread Length
F
E
S
EMP
Length
0
S
G
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 
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 – 6 - 2.520 2.401 1.500 1.470 .25 .200 .160 1.559 1.496 1.181 1.122 .177 .062 .203 .078 30° 
Earnest Technical Bulletin 5/1/12
#3 Dome Scraper Bolt 
 170M Strength Level 
E
M0
8
51
PS1
The Earnest Machine Products line of #3 Dome Head Plow Bolts are specially design 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 Strength
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 – 6 - 2.520 2.401 1.500 1.470 .25 .200 .160 1.559 1.496 1.181 1.122 .177 .062 .203 .078 30° 
 Earnest Technical Bulletin 5/1/12
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