Standard Hex Nuts Vs Heavy Hex Nuts

June 26, 2025

standard hex nuts vs heavy hex nut

A nuts should match the bolt section, which is paired with for remarkable outcome. Because when both gets precisely attached, than only it can last for a longer duration. It protects against ultimate conditions to handle significant weight.

The failure of fasteners can be unsafe because if inappropriate nuts or fastener can apart the machinery, which will create huge damages and could even be harmful for people. The below given information will make you understand that between the two which will be appropriate for your application.

Table of contents

  • Standard Hex Nuts vs Heavy Hex Nuts
  • Dimension Chart of Heavy Hex Nut
  • Weight Chart of Hex Nuts
  • Specification of SS Heavy Hex Nuts
  • Heavy Hex Nut Coating Process
  • Uses & Application of Heavy Hex Nuts
  • Key Benefits of Heavy Hex Bolt
  • Standard & Grades of Hex Nuts
  • Difference Between Standard Hex Nuts and Heavy Hex Nuts
  • Mechanical Properties of Heavy Hex Nut Vs Hex Nut According to ASTM A563
  • Advantages of Steel Heavy Hex Nuts
  • Features of Standard Hex Nuts & Heavy Hex Nuts

Standard Hex Nuts vs Heavy Hex Nuts

standard hex nuts vs heavy hex nuts specification

  Standard Hex Nuts Heavy Hex Nuts
  Hex Nut heavy hex nut
Shape Same shape as heavy hex nuts Same shape as standard hex nuts
Width Across Flats and Corners Smaller for the same nominal size Larger for the same nominal size
Thickness Thinner for the same nominal size Slightly thicker for the same nominal size
Diameter Across Flats Smaller 1/8” larger than standard hex nuts
Tool Requirements Standard wrenches and sockets Larger wrenches and sockets required
Proof Load Strength Lower compared to heavy hex nuts Higher compared to standard hex nuts

Check Dimensions and Weight Chart of Heavy Hex Nut

Heavy hex nuts are somewhat larger and broader than standard hex nuts. There are several grades and heavy designing which are usually used for a larger size diameter and high strength bolts.

Knowing the dimension will help for precise fitting and solidarity with other elements for connection. This will stop the problems such as misalignment, massive damage or failure.

Knowing the weight is also important, where structural strength and safety is important, such as in construction and engineering applications.

Dimension Chart of Heavy Hex Nut

Heavy Hex Nut Dimension

Bolt Dia. 1⁄2 5⁄8 3⁄4 7⁄8 13⁄8 11⁄2 1 11⁄8 11⁄4 15⁄8 13⁄4 31⁄4 31⁄2 2 21⁄2 23⁄4 3 33⁄4 4
F Width Across Flats Basic 7⁄8 11⁄16 11⁄4 17⁄16 23⁄16 23⁄8 15⁄8 113⁄16 2 29⁄16 23⁄4 5 53⁄8 31⁄8 37⁄8 41⁄4 45⁄8 53⁄4 61⁄8
Max 0.875 1.062 1.25 1.438 2.188 2.375 1.625 1.812 2 2.562 2.75 5 5.375 3 3.875 4.25 4.625 5.75 6.125
Min 0.85 1.031 1.212 1.394 2.119 2.3 1.575 1.756 1.938 2.481 2.662 4.838 5.2 3 3.75 4.112 4.475 5.562 5.925
C Width Across Corners Max 1.01 1.227 1.443 1.66 2.526 2.742 1.876 2.093 2.309 2.959 3.175 5.774 6.207 4 4.474 4.907 5.34 6.64 7.073
Min 0.969 1.175 1.382 1.589 2.416 2.622 1.796 2.002 2.209 2.828 3.035 5.515 5.928 3 4.275 4.688 5.102 6.341 6.755
H Thickness Basic 31⁄64 39⁄64 47⁄64 55⁄64 111⁄32 115⁄32 63⁄64 17⁄64 17⁄32 119⁄32 123⁄32 33⁄16 37⁄16 131⁄32 229⁄64 245⁄64 261⁄64 311⁄16 315⁄16
Max 0.504 0.631 0.758 0.885 1.378 1.505 1.012 1.139 1.251 1.632 1.759 3.252 3.506 2 2.505 2.759 3.013 3.76 4.014
Min 0.464 0.587 0.71 0.833 1.31 1.433 0.956 1.079 1.187 1.556 1.679 3.124 3.37 2 2.401 2.647 2.893 3.616 3.862
Weight(lbs.) 0.07 0.12 0.2 0.3 1.02 1.31 0.43 0.59 0.79 1.62 2.04 11.94 15.26 3 5.64 7.38 9.5 18.12 21.8
Part Numbers A563A Import Plain 11729 11731 11733 11735 11743 11745 11737 11739 11741 17750 11747 18395 18495 # 11753 15864 15863 – 11755
Galv. 11730 11732 11734 11736 11744 11746 11738 11740 11742 17751 11748 – – # 11754  16041 16042 – 11756
A1942H Domestic Plain – 16358 16360 16362 16374 16378 16364 16366 16370 16380 16384 – – # 16398 16400 16402 – 16404
Galv. – 16359 16361 16363 – – 16365 – – 16381 16385 – – # 16399 16401 16403 – 16405
Import Plain 11761 11763 11765 11767 11775 11777 11769 11771 11773 11779 12549 – – # 12553 12555 12601 – –
Galv. 11762 11764 11766 11768 11776 11778 11770 11772 11774 11780 12550 – – # 12554 12556 12602 – –
A563DH Domestic Plain 16356 – – – – – – – – 16380 16384 – – # 16398 16400 16402 – 16404
Galv. 18345 18346 18347 18348 16375 16379 18349 16367 16371 16381 16385 – – # 16399 16401 16403 – 16405

Weight Chart of Hex Nuts

Weight Chart of Hex Nuts

METRIC RANGE – DIMENSION (mm) AND WEIGHT (Kg) PER 100 PIECES
d M8 M10 M12 M14 M16 M18 M20 M22 M24 M27 M30 M33 M36 M39 M42 M45 M48 M52 M56 M60 M64 M68 M72 M76 M80 M85
S Min 12.73 16.73 18.67 21.67 23.67 26.67 29.67 31.61 35.38 40.38 45.38 49.26 54.26 59.26 64.26 69.26 74.26 79.26 84.15 89.13 94.13 99.13 104.13 109.13 114.13 119.13
Max 13 17 19 22 24 27 30 32 36 41 46 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
e Min 14.38 18.9 21.1 24.49 26.75 30.14 33.53 35.72 39.98 45.63 51.28 55.8 61.31 66.95 72.61 78.26 83.91 89.56 95.07 100.72 106.37 112.02 117.67 123.32 128.97 134.62
Max 15 19.6 21.9 25.4 27.7 31.1 34.6 36.9 41.5 47.3 53.1 57.7 63.5 69.3 75 80.8 86.5 92.4 98.1 103.9 109.7 115.5 121.25 127 132.8 138.6
m Min 7.64 9.64 11.57 13.57 15.57 17.57 19.48 21.48 23.48 26.48 29.48 32.38 35.38 38.38 41.38 44.38 47.38 51.38 55.26 59.26 63.26 67.26 71.26 75.26 79.26 84.13
Max 8 10 12 14 16 18 20 22 24 27 30 33 36 39 42 45 48 52 56 60 64 68 72 76 80 85
WEIGHT 0.65 1.43 2.03 3.14 4.05 5.82 7.91 9.49 13.7 20 28.4 36.1 48.3 62.3 79.5 98.8 122 147 177 208 245 284 327 374 425 483

Specification of SS Heavy Hex Nuts

  • Metric Size Range: M3 – M48
  • Imperial Size: 3/8 to 8″
  • Surface Finish: Cadmium zinc plated, Galvanized, Hot dip Galvanized, Nickel Plated, Blackening
  • Material: Stainless steel, Carbon, Alloy Steel, API 5L Copper, Duplex, Titanium
  • Threads: Metric, BSW, BSF, UNC, UNF
  • Test Certificates: EN 10204 / 3.1B, Raw Materials Certificate, Third Party Inspection Report, 100% Radiography Test Report
  • Application: Heavy Industry, Marine, Ship Building, Oil & Gas Projects

Heavy Hex Nut Coating Process

coating process
  • PTFE Coated
  • Hot Dip galvanized
  • Yellow Zinc Plated
  • Blue Zinc Plated
  • Black Zinc Plate
  • Zinc Cobalt Plated
  • Aluminium Zinc Flake Coated
  • Black Phosphate
  • Zinc Plated
  • Nickel Plated

Heavy Hex Nuts Are Typically Made From High-grade Steel and Used With Heavy Bolts

High grade steel gives ultimate strength and longevity to heavy hex nuts in applications where high bending loads and pressure are experienced.

The combination of heavy hex nut and bolts gives strong and protected attachment which resists from conditions and averts damages in structures and equipment’s.

Uses & Application of Heavy Hex Nuts

Application Area Uses and Examples
Construction – Structural Steel
– Heavy Machinery
Transportation – Railroads
– Automotive
Industrial – Machinery
– Pipelines
Energy Sector – Oil and Gas
– Renewable Energy
High-Strength Bolting – High-Stress Fasteners
Mining – Mining Equipment
Marine Applications – Shipbuilding
– Offshore Platforms

Key Benefits of Heavy Hex Bolt

  • Increased Strength: Handle higher loads and stresses compared to standard hex nuts.
  • Durability: More durable and resistant to deformation under load
  • Better Bearing Surface: The larger surface area of heavy hex nuts provides a more substantial bearing surface

Refer Standard Hex Nut Sizes and Torque Chart

The given Standard hex nut sizes are known by its minimal diameter and threaded pitch which makes it accord with the bolt or screw which is deliberated to fit with.

A torque chart of standard hex nut is the value of tightening hex nuts in order to give precise cramping force in a bolted joint. Accurate torque is important for sustaining strength of connection which will guarantee that the fasteners are not too loose or too tight.

Standard & Grades of Hex Nuts

Material Standards Grades
Stainless Steel Hex Nuts ASTM / ASME A/SA 193 / 194 B 8 (304), B 8C (SS 347), B 8M (SS 316), B 8 T (SS 321), A 2, A 4
Nickel Alloy Hex Nuts ASTM / ASME SB 160 / 164 / 425 / 166 / 446 / 574 / 472 UNS 2200 (NICKEL 200) / UNS 2201 (NICKEL 201), UNS 4400 (MONEL 400), UNS 8825 (INCONEL 825), UNS 6600 (INCONEL 600) / UNS 6601 (INCONEL 601), UNS 6625 (INCONEL 625), UNS 10276 (HASTELLOY C 276), UNS 8020 (ALLOY 20 / 20 CB 3)
Alloy Steel Hex Nuts ASTM / ASME A/SA 193 / 194 GR B 6, B 7/ B 7M, B 16, 2, 2HM, 2H, GR 6, B 7, B 7M
Standard Hex Nut Has Smaller Widths Compared to Heavy Hex Nuts

The heavy hex nuts has a larger widths over the flats and corners which is somewhat thicker in comparison to standard hex nuts. Because of its massive design, it is likely to offer higher pressure load as compared to standard hex nuts.

Difference Between Standard Hex Nuts and Heavy Hex Nuts

Standard Hex Nut vs Heavy Hex Nuts

Standard Hex Nuts

  • Difference in Appearance: Standard hex nuts have a smaller width compared to heavy hex nuts.
  • Strength Compatibility: A stronger nut with a weaker bolt is acceptable.
  • Failure Risk: A weaker nut with a stronger bolt can cause fastener failure

Heavy Hex Nuts

  • Thickness and Weight: Heavy Hex Nuts Are Thicker and Heavier Than Standard Hex Nuts.
  • Diameter: They Have a Larger Diameter Across the Flats.
  • Tool Requirements: Installation Requires Larger Sockets and Wrenches.
  • Load Strength: They Can Bear Significantly More Weight Compared to Standard Hex Nuts.

Mechanical Properties of Heavy Hex Nut Vs Hex Nut According to ASTM A563

Grade A B C / C3 D DH / DH3
Style Hex Heavy Hex Heavy Hex Heavy Hex Heavy Hex Heavy Hex Heavy Hex
Size, in. 1/4 – 1-1/2 1/4 – 4 1/4 – 1 1-1/8 – 1-1/2 1/4 – 4 1/4 – 4 1/4 – 4
Proof Load, ksi Plain 90 100 133 116 144 150 175
Galvanized 68 75 100 87 144 150 150
Hardness, HBN 116 – 302 116 – 302 121 – 302 121 – 302 143 – 352 248 – 352 248 – 352
Steel heavy hex nuts provide increased bearing surface area

It is thicker and wider, which makes it stronger, and its strength arises from expanded attachment, which is because of its thickness and higher resistance to expansion because of its longer width.

Advantages of Steel Heavy Hex Nuts

  • Increased Bearing Surface Area: Steel heavy hex nuts have a bigger area for making contact.
  • Improved Load Distribution: The expanded surface helps spread out the load more evenly.
  • Greater Durability: The design allows the nut to handle more weight and stress.

Features of Standard Hex Nuts & Heavy Hex Nuts

Feature Standard Hex Nuts Heavy Hex Nuts
Thickness Thinner Thicker
Weight Lighter Heavier
Diameter Across Flats Smaller Larger
Bearing Surface Area Smaller Larger
Load Strength Lower Higher

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