#3 Domed Head Plow Bolt Standard Thread and Body Length

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Adele Marshall
6 years ago
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1 #3 Domed Plow Bolt Standard Thread and Body Length

2 Flat vs Dome Plow Bolts Flat (per ASME B18.9) Domed Designs Supplied by Earnest (per Cat 1E44) 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. Dome Height Dome Height Feed Feed Domed with large dome height small feed thickness Domed with small dome height large feed thickness Dome 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. Dome Feed Width of Depth of Transition Diameter Body Dia. Fillet Rad Corner Rad Hgt Thick Square &Square 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/ / / / /

3 Plow Bolt Designs 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, 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 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. No. 1 Key No. 2 Round No. 3 Flat Round Square Neck No. 3 Domed Round Square Neck (Scraper Blade Bolt) No. 4 Square No. 6 Large Key No. 7 Reverse Key (Bucket Tooth Bolt) No. 8 Contour (Elliptical ) No. 11 Chattanooga (non designated) Clipped

4 #3 Oversized Flat Plow Bolts Grade 5 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 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 Plow Bolts come threaded to the head to fit a variety of grip ranges. E5 Earnest #3 Oversized Plow Bolt Tolerances Diameter Depth of Width of Square Square (Thread Corresponding A S B Dia) Plow Bolt Max Min Min Max Min Max Min Sharp 3/8 16 7/ / / L Note that the Oversized style is not the same as the Repair style listed in ANSI B18.9. Compared to a Standard #3 Plow Bolt Dimension that a standard #3 head plow bolt is made to (per ANSI B18.9 Regular Series) Diameter Depth of Square Width of Square A S B Max Min Min Max Min Max Min Sharp 3/ / /

5 5/2/12 #3 Regular Flat Plow Bolt Earnest Machine Products line of #3 Plow Bolts in sizes 3/8 to 5/8 diameters are manufactured to the dimensions specified by ASME/ANSI B18.9 for Regular Series. CR Min Thread Length Length Max Thread Length ASME/ANSI B18.9 Plow Bolts # 3 Flat Tolerances (Regular Series) Diameter Width of Square Feed Thick Corner Rad A B F S CR Max Min Max Min Max Min Max Min Max 3/ / / / Earnest also stocks the Dome 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 Plow Bolt Thread Lengths Thread Length per Bolt Diameter Overall 3/8 7/16 1/2 5/8 Length 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 1/4 T to H T to H 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

6 5/1/12 #3 Dome Scraper Bolt 170M Strength Level 170M EMP P S 1 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 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. 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 A E CR 7 1 P 0 M EMP S I D F S Fr Length Min Thread Length G Diameter Body Dia. Dome Feed Thick Width of Depth of Fillet Rad Corner Rad Transition Hgt Square Square 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/ / / / / / /

7 5/1/12 o ed ead low olt 15 0M PS1 E 8 The Earnest Machine Products line of #3 Dome 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. design will fit into all applications designed for # 3 s. 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 E5 15OMPSI Grade 5 E8 Grade 8 Diameter Body Dia. Dome Feed Thick Width of Depth of Fillet Rad Corner Rad Transition Hgt Square Square 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/ / / / / / / /

Spotting Quality. Your guide to sourcing high quality fasteners. How can we help you today?

Spotting Quality. Your guide to sourcing high quality fasteners. How can we help you today? Spotting Quality Your guide to sourcing high quality fasteners. How can we help you today? Getting what you pay for. When sourcing plow bolts, or any fastener for that matter, it is easy to choose price