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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
3/8-16 UNC0.7516UNC2A0.6881000
3/8-16 UNC0.87516UNC2A0.6881000
3/8-16 UNC116UNC2A0.6881000
3/8-16 UNC1.12516UNC2A0.6881000
3/8-16 UNC1.2516UNC2A0.6881000
3/8-16 UNC1.37516UNC2A0.6881000
3/8-16 UNC1.516UNC2A0.6881000
3/8-16 UNC1.7516UNC2A0.6881000
3/8-16 UNC216UNC2A0.6881000
3/8-16 UNC2.2516UNC2A0.6881000
3/8-16 UNC2.516UNC2A0.6881000
3/8-16 UNC2.7516UNC2A0.6881000
3/8-16 UNC316UNC2A0.6881000
3/8-16 UNC3.2516UNC2A0.6881000
3/8-16 UNC3.516UNC2A0.6881000
3/8-16 UNC3.7516UNC2A0.6881000

Showing 16 of 94 sizes

3/8-16 UNC × 0.75 × 16 × UNC × 2A × 0.688 × 0.763 × 0.243 × 0.375 × 0.375 × 0.36 × 0.669 × 0.794 × 0.226 × 0.16 × 1 × 1.25

dNominal Diameter (in)3/8-16 UNC
lLength (in)0.75
TPIThreads Per Inch16
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)0.688
MOQ1000

3/8-16 UNC × 0.875 × 16 × UNC × 2A × 0.688 × 0.763 × 0.243 × 0.375 × 0.375 × 0.36 × 0.669 × 0.794 × 0.226 × 0.16 × 1 × 1.25

dNominal Diameter (in)3/8-16 UNC
lLength (in)0.875
TPIThreads Per Inch16
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)0.688
MOQ1000

3/8-16 UNC × 1 × 16 × UNC × 2A × 0.688 × 0.763 × 0.243 × 0.375 × 0.375 × 0.36 × 0.669 × 0.794 × 0.226 × 0.16 × 1 × 1.25

dNominal Diameter (in)3/8-16 UNC
lLength (in)1
TPIThreads Per Inch16
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)0.688
MOQ1000

3/8-16 UNC × 1.125 × 16 × UNC × 2A × 0.688 × 0.763 × 0.243 × 0.375 × 0.375 × 0.36 × 0.669 × 0.794 × 0.226 × 0.16 × 1 × 1.25

dNominal Diameter (in)3/8-16 UNC
lLength (in)1.125
TPIThreads Per Inch16
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)0.688
MOQ1000

3/8-16 UNC × 1.25 × 16 × UNC × 2A × 0.688 × 0.763 × 0.243 × 0.375 × 0.375 × 0.36 × 0.669 × 0.794 × 0.226 × 0.16 × 1 × 1.25

dNominal Diameter (in)3/8-16 UNC
lLength (in)1.25
TPIThreads Per Inch16
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)0.688
MOQ1000

3/8-16 UNC × 1.375 × 16 × UNC × 2A × 0.688 × 0.763 × 0.243 × 0.375 × 0.375 × 0.36 × 0.669 × 0.794 × 0.226 × 0.16 × 1 × 1.25

dNominal Diameter (in)3/8-16 UNC
lLength (in)1.375
TPIThreads Per Inch16
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)0.688
MOQ1000

3/8-16 UNC × 1.5 × 16 × UNC × 2A × 0.688 × 0.763 × 0.243 × 0.375 × 0.375 × 0.36 × 0.669 × 0.794 × 0.226 × 0.16 × 1 × 1.25

dNominal Diameter (in)3/8-16 UNC
lLength (in)1.5
TPIThreads Per Inch16
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)0.688
MOQ1000

3/8-16 UNC × 1.75 × 16 × UNC × 2A × 0.688 × 0.763 × 0.243 × 0.375 × 0.375 × 0.36 × 0.669 × 0.794 × 0.226 × 0.16 × 1 × 1.25

dNominal Diameter (in)3/8-16 UNC
lLength (in)1.75
TPIThreads Per Inch16
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)0.688
MOQ1000

3/8-16 UNC × 2 × 16 × UNC × 2A × 0.688 × 0.763 × 0.243 × 0.375 × 0.375 × 0.36 × 0.669 × 0.794 × 0.226 × 0.16 × 1 × 1.25

dNominal Diameter (in)3/8-16 UNC
lLength (in)2
TPIThreads Per Inch16
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)0.688
MOQ1000

3/8-16 UNC × 2.25 × 16 × UNC × 2A × 0.688 × 0.763 × 0.243 × 0.375 × 0.375 × 0.36 × 0.669 × 0.794 × 0.226 × 0.16 × 1 × 1.25

dNominal Diameter (in)3/8-16 UNC
lLength (in)2.25
TPIThreads Per Inch16
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)0.688
MOQ1000

3/8-16 UNC × 2.5 × 16 × UNC × 2A × 0.688 × 0.763 × 0.243 × 0.375 × 0.375 × 0.36 × 0.669 × 0.794 × 0.226 × 0.16 × 1 × 1.25

dNominal Diameter (in)3/8-16 UNC
lLength (in)2.5
TPIThreads Per Inch16
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)0.688
MOQ1000

3/8-16 UNC × 2.75 × 16 × UNC × 2A × 0.688 × 0.763 × 0.243 × 0.375 × 0.375 × 0.36 × 0.669 × 0.794 × 0.226 × 0.16 × 1 × 1.25

dNominal Diameter (in)3/8-16 UNC
lLength (in)2.75
TPIThreads Per Inch16
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)0.688
MOQ1000

3/8-16 UNC × 3 × 16 × UNC × 2A × 0.688 × 0.763 × 0.243 × 0.375 × 0.375 × 0.36 × 0.669 × 0.794 × 0.226 × 0.16 × 1 × 1.25

dNominal Diameter (in)3/8-16 UNC
lLength (in)3
TPIThreads Per Inch16
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)0.688
MOQ1000

3/8-16 UNC × 3.25 × 16 × UNC × 2A × 0.688 × 0.763 × 0.243 × 0.375 × 0.375 × 0.36 × 0.669 × 0.794 × 0.226 × 0.16 × 1 × 1.25

dNominal Diameter (in)3/8-16 UNC
lLength (in)3.25
TPIThreads Per Inch16
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)0.688
MOQ1000

3/8-16 UNC × 3.5 × 16 × UNC × 2A × 0.688 × 0.763 × 0.243 × 0.375 × 0.375 × 0.36 × 0.669 × 0.794 × 0.226 × 0.16 × 1 × 1.25

dNominal Diameter (in)3/8-16 UNC
lLength (in)3.5
TPIThreads Per Inch16
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)0.688
MOQ1000

3/8-16 UNC × 3.75 × 16 × UNC × 2A × 0.688 × 0.763 × 0.243 × 0.375 × 0.375 × 0.36 × 0.669 × 0.794 × 0.226 × 0.16 × 1 × 1.25

dNominal Diameter (in)3/8-16 UNC
lLength (in)3.75
TPIThreads Per Inch16
Thread SeriesUNC
Thread Class2A
sWidth Across Flats (max) (in)0.688
MOQ1000

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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