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Heavy Hex Screw ASME B18.2.1

ASME B18.2.1 (Current)

Material
Carbon Steel
Property Class
Grade A
Finish
Hot Dip Galvanized, Plain
Size range
1/2-13UNC–7/8-9UNC
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Select sizes and quantities — 94 confirmed sizes to ASME B18.2.1

Material
Grade
Finish
dNominal Diameter (in)lLength (in)TPIThreads Per InchThread SeriesThread ClasssWidth Across Flats (max) (in)MOQQuantity and inquiry
3/4-10 UNC3.7510UNC2A1.25250
3/4-10 UNC410UNC2A1.25250
3/4-10 UNC4.510UNC2A1.25250
3/4-10 UNC510UNC2A1.25250
3/4-10 UNC5.510UNC2A1.25250
7/8-9 UNC1.759UNC2A1.438100
7/8-9 UNC29UNC2A1.438100
7/8-9 UNC2.259UNC2A1.438100
7/8-9 UNC2.59UNC2A1.438100
7/8-9 UNC2.759UNC2A1.438100
7/8-9 UNC39UNC2A1.438100
7/8-9 UNC3.259UNC2A1.438100
7/8-9 UNC3.59UNC2A1.438100
7/8-9 UNC3.759UNC2A1.438100
7/8-9 UNC49UNC2A1.438100
7/8-9 UNC4.59UNC2A1.438100

Showing 16 of 94 sizes

3/4-10 UNC × 3.75 × 10 × UNC × 2A × 1.25 × 1.383 × 0.483 × 0.75 × 0.75 × 0.729 × 1.212 × 1.443 × 0.455 × 0.324 × 1.75 × 2

dNominal Diameter (in)3/4-10 UNC
lLength (in)3.75
TPIThreads Per Inch10
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)1.25
MOQ250

3/4-10 UNC × 4 × 10 × UNC × 2A × 1.25 × 1.383 × 0.483 × 0.75 × 0.75 × 0.729 × 1.212 × 1.443 × 0.455 × 0.324 × 1.75 × 2

dNominal Diameter (in)3/4-10 UNC
lLength (in)4
TPIThreads Per Inch10
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)1.25
MOQ250

3/4-10 UNC × 4.5 × 10 × UNC × 2A × 1.25 × 1.383 × 0.483 × 0.75 × 0.75 × 0.729 × 1.212 × 1.443 × 0.455 × 0.324 × 1.75 × 2

dNominal Diameter (in)3/4-10 UNC
lLength (in)4.5
TPIThreads Per Inch10
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)1.25
MOQ250

3/4-10 UNC × 5 × 10 × UNC × 2A × 1.25 × 1.383 × 0.483 × 0.75 × 0.75 × 0.729 × 1.212 × 1.443 × 0.455 × 0.324 × 1.75 × 2

dNominal Diameter (in)3/4-10 UNC
lLength (in)5
TPIThreads Per Inch10
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)1.25
MOQ250

3/4-10 UNC × 5.5 × 10 × UNC × 2A × 1.25 × 1.383 × 0.483 × 0.75 × 0.75 × 0.729 × 1.212 × 1.443 × 0.455 × 0.324 × 1.75 × 2

dNominal Diameter (in)3/4-10 UNC
lLength (in)5.5
TPIThreads Per Inch10
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)1.25
MOQ250

7/8-9 UNC × 1.75 × 9 × UNC × 2A × 1.438 × 1.589 × 0.563 × 0.875 × 0.875 × 0.852 × 1.394 × 1.66 × 0.531 × 0.378 × 2 × 2.25

dNominal Diameter (in)7/8-9 UNC
lLength (in)1.75
TPIThreads Per Inch9
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)1.438
MOQ100

7/8-9 UNC × 2 × 9 × UNC × 2A × 1.438 × 1.589 × 0.563 × 0.875 × 0.875 × 0.852 × 1.394 × 1.66 × 0.531 × 0.378 × 2 × 2.25

dNominal Diameter (in)7/8-9 UNC
lLength (in)2
TPIThreads Per Inch9
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)1.438
MOQ100

7/8-9 UNC × 2.25 × 9 × UNC × 2A × 1.438 × 1.589 × 0.563 × 0.875 × 0.875 × 0.852 × 1.394 × 1.66 × 0.531 × 0.378 × 2 × 2.25

dNominal Diameter (in)7/8-9 UNC
lLength (in)2.25
TPIThreads Per Inch9
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)1.438
MOQ100

7/8-9 UNC × 2.5 × 9 × UNC × 2A × 1.438 × 1.589 × 0.563 × 0.875 × 0.875 × 0.852 × 1.394 × 1.66 × 0.531 × 0.378 × 2 × 2.25

dNominal Diameter (in)7/8-9 UNC
lLength (in)2.5
TPIThreads Per Inch9
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)1.438
MOQ100

7/8-9 UNC × 2.75 × 9 × UNC × 2A × 1.438 × 1.589 × 0.563 × 0.875 × 0.875 × 0.852 × 1.394 × 1.66 × 0.531 × 0.378 × 2 × 2.25

dNominal Diameter (in)7/8-9 UNC
lLength (in)2.75
TPIThreads Per Inch9
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)1.438
MOQ100

7/8-9 UNC × 3 × 9 × UNC × 2A × 1.438 × 1.589 × 0.563 × 0.875 × 0.875 × 0.852 × 1.394 × 1.66 × 0.531 × 0.378 × 2 × 2.25

dNominal Diameter (in)7/8-9 UNC
lLength (in)3
TPIThreads Per Inch9
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)1.438
MOQ100

7/8-9 UNC × 3.25 × 9 × UNC × 2A × 1.438 × 1.589 × 0.563 × 0.875 × 0.875 × 0.852 × 1.394 × 1.66 × 0.531 × 0.378 × 2 × 2.25

dNominal Diameter (in)7/8-9 UNC
lLength (in)3.25
TPIThreads Per Inch9
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)1.438
MOQ100

7/8-9 UNC × 3.5 × 9 × UNC × 2A × 1.438 × 1.589 × 0.563 × 0.875 × 0.875 × 0.852 × 1.394 × 1.66 × 0.531 × 0.378 × 2 × 2.25

dNominal Diameter (in)7/8-9 UNC
lLength (in)3.5
TPIThreads Per Inch9
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)1.438
MOQ100

7/8-9 UNC × 3.75 × 9 × UNC × 2A × 1.438 × 1.589 × 0.563 × 0.875 × 0.875 × 0.852 × 1.394 × 1.66 × 0.531 × 0.378 × 2 × 2.25

dNominal Diameter (in)7/8-9 UNC
lLength (in)3.75
TPIThreads Per Inch9
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)1.438
MOQ100

7/8-9 UNC × 4 × 9 × UNC × 2A × 1.438 × 1.589 × 0.563 × 0.875 × 0.875 × 0.852 × 1.394 × 1.66 × 0.531 × 0.378 × 2 × 2.25

dNominal Diameter (in)7/8-9 UNC
lLength (in)4
TPIThreads Per Inch9
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)1.438
MOQ100

7/8-9 UNC × 4.5 × 9 × UNC × 2A × 1.438 × 1.589 × 0.563 × 0.875 × 0.875 × 0.852 × 1.394 × 1.66 × 0.531 × 0.378 × 2 × 2.25

dNominal Diameter (in)7/8-9 UNC
lLength (in)4.5
TPIThreads Per Inch9
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)1.438
MOQ100

Product details

Description
Heavy Hex Screw ASME B18.2.1 is a hexagon head bolt with a partially threaded shank, supplied in carbon steel Grade A. The head and body dimensions follow ASME B18.2.1, with UNC thread series and class 2A. Available diameters range from 3/8-16 UNC to 1-8 UNC, with hot dip galvanized or plain finish. For quotation, specify diameter, length, finish, and required quantity.
Features
Hexagon head with heavy dimensions per ASME B18.2.1 · Partially threaded shank with plain bearing section under the head · UNC thread series, class 2A · Available in diameters 3/8-16 UNC through 1-8 UNC
Applications
Shear-loaded joints where a plain shank is required, Steel structure connections, Machinery and equipment assembly, Maintenance and repair work

Order assurance

Confirmed for the quoted product and order.

Reports & inspection

Agreed in the quotation.

  • EN 10204 3.1 material certificate
  • Dimensional inspection report
  • Certificate of conformity
  • Mechanical test report
  • Chemical analysis report
  • Coating inspection report
  • Batch and lot traceability

Packaging & delivery

Options we supply.

  • Bulk carton packing
  • Small boxes with outer cartons
  • Palletized shipment
  • Fumigation-free pallets
  • Inner poly bags
  • Buyer branding and labels

Product questions

What sizes of Heavy Hex Screw ASME B18.2.1 do you supply?

Execution standard: ASME B18.2.1. The confirmed specification table covers 1–7 diameters and 0.75–5.5 lengths. Use the specification table to select the exact variant required for quotation.

Which materials, grades and finishes can I order?

Material: Carbon Steel; Property class: Grade A; Finish: Hot Dip Galvanized, Plain. Availability should be confirmed against the selected specification and order quantity.

Where are these heavy hex bolts typically used?

Typical applications include Shear-loaded joints where a plain shank is required, Steel structure connections, Machinery and equipment assembly, Maintenance and repair work. Final suitability depends on the selected material, grade, finish and operating conditions.

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