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Hex Flange Screw ASME B18.2.1

ASME B18.2.1 (Current)

Material
Carbon Steel
Property Class
Grade 5, Grade 8
Finish
Zinc Plated, Blackened, Plain
Size range
1/4-20UNC–7/16-14UNC
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Select sizes and quantities — 93 confirmed sizes to ASME B18.2.1

Material
Grade
Finish
dNominal Diameter (in)lLength (in)sWidth Across Flats (max) (in)kNominal Head Height (in)dBasic Major Diameter (in)TPIThreads Per InchMOQQuantity and inquiry
1/2-13 UNC40.750.510.513500
5/8-11 UNC1.1250.93750.620.62511250
5/8-11 UNC1.250.93750.620.62511250
5/8-11 UNC1.3750.93750.620.62511250
5/8-11 UNC1.50.93750.620.62511250
5/8-11 UNC1.750.93750.620.62511250
5/8-11 UNC20.93750.620.62511250
5/8-11 UNC2.250.93750.620.62511250
5/8-11 UNC2.50.93750.620.62511250
5/8-11 UNC2.750.93750.620.62511250
5/8-11 UNC30.93750.620.62511250
5/8-11 UNC3.250.93750.620.62511250
5/8-11 UNC3.50.93750.620.62511250
5/8-11 UNC3.750.93750.620.62511250
5/8-11 UNC40.93750.620.62511250
5/8-11 UNC4.50.93750.620.62511250

Showing 16 of 93 sizes

1/2-13 UNC × 4 × 0.75 × 0.51 × 0.5 × 13 × UNC × 2A × 0.5 × 0.493 × 0.736 × 0.825 × 0.866 × 1.25 × 1.5

dNominal Diameter (in)1/2-13 UNC
lLength (in)4
sWidth Across Flats (max) (in)0.75
kNominal Head Height (in)0.51
dBasic Major Diameter (in)0.5
TPIThreads Per Inch13
MOQ500

5/8-11 UNC × 1.125 × 0.9375 × 0.62 × 0.625 × 11 × UNC × 2A × 0.625 × 0.617 × 0.922 × 1.034 × 1.083 × 1.5 × 1.75

dNominal Diameter (in)5/8-11 UNC
lLength (in)1.125
sWidth Across Flats (max) (in)0.9375
kNominal Head Height (in)0.62
dBasic Major Diameter (in)0.625
TPIThreads Per Inch11
MOQ250

5/8-11 UNC × 1.25 × 0.9375 × 0.62 × 0.625 × 11 × UNC × 2A × 0.625 × 0.617 × 0.922 × 1.034 × 1.083 × 1.5 × 1.75

dNominal Diameter (in)5/8-11 UNC
lLength (in)1.25
sWidth Across Flats (max) (in)0.9375
kNominal Head Height (in)0.62
dBasic Major Diameter (in)0.625
TPIThreads Per Inch11
MOQ250

5/8-11 UNC × 1.375 × 0.9375 × 0.62 × 0.625 × 11 × UNC × 2A × 0.625 × 0.617 × 0.922 × 1.034 × 1.083 × 1.5 × 1.75

dNominal Diameter (in)5/8-11 UNC
lLength (in)1.375
sWidth Across Flats (max) (in)0.9375
kNominal Head Height (in)0.62
dBasic Major Diameter (in)0.625
TPIThreads Per Inch11
MOQ250

5/8-11 UNC × 1.5 × 0.9375 × 0.62 × 0.625 × 11 × UNC × 2A × 0.625 × 0.617 × 0.922 × 1.034 × 1.083 × 1.5 × 1.75

dNominal Diameter (in)5/8-11 UNC
lLength (in)1.5
sWidth Across Flats (max) (in)0.9375
kNominal Head Height (in)0.62
dBasic Major Diameter (in)0.625
TPIThreads Per Inch11
MOQ250

5/8-11 UNC × 1.75 × 0.9375 × 0.62 × 0.625 × 11 × UNC × 2A × 0.625 × 0.617 × 0.922 × 1.034 × 1.083 × 1.5 × 1.75

dNominal Diameter (in)5/8-11 UNC
lLength (in)1.75
sWidth Across Flats (max) (in)0.9375
kNominal Head Height (in)0.62
dBasic Major Diameter (in)0.625
TPIThreads Per Inch11
MOQ250

5/8-11 UNC × 2 × 0.9375 × 0.62 × 0.625 × 11 × UNC × 2A × 0.625 × 0.617 × 0.922 × 1.034 × 1.083 × 1.5 × 1.75

dNominal Diameter (in)5/8-11 UNC
lLength (in)2
sWidth Across Flats (max) (in)0.9375
kNominal Head Height (in)0.62
dBasic Major Diameter (in)0.625
TPIThreads Per Inch11
MOQ250

5/8-11 UNC × 2.25 × 0.9375 × 0.62 × 0.625 × 11 × UNC × 2A × 0.625 × 0.617 × 0.922 × 1.034 × 1.083 × 1.5 × 1.75

dNominal Diameter (in)5/8-11 UNC
lLength (in)2.25
sWidth Across Flats (max) (in)0.9375
kNominal Head Height (in)0.62
dBasic Major Diameter (in)0.625
TPIThreads Per Inch11
MOQ250

5/8-11 UNC × 2.5 × 0.9375 × 0.62 × 0.625 × 11 × UNC × 2A × 0.625 × 0.617 × 0.922 × 1.034 × 1.083 × 1.5 × 1.75

dNominal Diameter (in)5/8-11 UNC
lLength (in)2.5
sWidth Across Flats (max) (in)0.9375
kNominal Head Height (in)0.62
dBasic Major Diameter (in)0.625
TPIThreads Per Inch11
MOQ250

5/8-11 UNC × 2.75 × 0.9375 × 0.62 × 0.625 × 11 × UNC × 2A × 0.625 × 0.617 × 0.922 × 1.034 × 1.083 × 1.5 × 1.75

dNominal Diameter (in)5/8-11 UNC
lLength (in)2.75
sWidth Across Flats (max) (in)0.9375
kNominal Head Height (in)0.62
dBasic Major Diameter (in)0.625
TPIThreads Per Inch11
MOQ250

5/8-11 UNC × 3 × 0.9375 × 0.62 × 0.625 × 11 × UNC × 2A × 0.625 × 0.617 × 0.922 × 1.034 × 1.083 × 1.5 × 1.75

dNominal Diameter (in)5/8-11 UNC
lLength (in)3
sWidth Across Flats (max) (in)0.9375
kNominal Head Height (in)0.62
dBasic Major Diameter (in)0.625
TPIThreads Per Inch11
MOQ250

5/8-11 UNC × 3.25 × 0.9375 × 0.62 × 0.625 × 11 × UNC × 2A × 0.625 × 0.617 × 0.922 × 1.034 × 1.083 × 1.5 × 1.75

dNominal Diameter (in)5/8-11 UNC
lLength (in)3.25
sWidth Across Flats (max) (in)0.9375
kNominal Head Height (in)0.62
dBasic Major Diameter (in)0.625
TPIThreads Per Inch11
MOQ250

5/8-11 UNC × 3.5 × 0.9375 × 0.62 × 0.625 × 11 × UNC × 2A × 0.625 × 0.617 × 0.922 × 1.034 × 1.083 × 1.5 × 1.75

dNominal Diameter (in)5/8-11 UNC
lLength (in)3.5
sWidth Across Flats (max) (in)0.9375
kNominal Head Height (in)0.62
dBasic Major Diameter (in)0.625
TPIThreads Per Inch11
MOQ250

5/8-11 UNC × 3.75 × 0.9375 × 0.62 × 0.625 × 11 × UNC × 2A × 0.625 × 0.617 × 0.922 × 1.034 × 1.083 × 1.5 × 1.75

dNominal Diameter (in)5/8-11 UNC
lLength (in)3.75
sWidth Across Flats (max) (in)0.9375
kNominal Head Height (in)0.62
dBasic Major Diameter (in)0.625
TPIThreads Per Inch11
MOQ250

5/8-11 UNC × 4 × 0.9375 × 0.62 × 0.625 × 11 × UNC × 2A × 0.625 × 0.617 × 0.922 × 1.034 × 1.083 × 1.5 × 1.75

dNominal Diameter (in)5/8-11 UNC
lLength (in)4
sWidth Across Flats (max) (in)0.9375
kNominal Head Height (in)0.62
dBasic Major Diameter (in)0.625
TPIThreads Per Inch11
MOQ250

5/8-11 UNC × 4.5 × 0.9375 × 0.62 × 0.625 × 11 × UNC × 2A × 0.625 × 0.617 × 0.922 × 1.034 × 1.083 × 1.5 × 1.75

dNominal Diameter (in)5/8-11 UNC
lLength (in)4.5
sWidth Across Flats (max) (in)0.9375
kNominal Head Height (in)0.62
dBasic Major Diameter (in)0.625
TPIThreads Per Inch11
MOQ250

Product details

Description
Hexagon head bolt with a flange face, manufactured to ASME B18.2.1. The thread is partial, leaving a plain shank under the head. Available in UNC diameters from 1/4-20 to 3/4-10, thread class 2A. Supply material is carbon steel in Grade 5 or Grade 8, with zinc plated, blackened, or plain finish. For quotation, specify diameter, length, grade, and finish.
Features
Integral flange under hex head provides wide bearing surface · Part-thread body with plain shank for shear applications · UNC thread series, class 2A · Available in diameters 1/4-20 UNC to 3/4-10 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 Hex Flange Screw ASME B18.2.1 do you supply?

Execution standard: ASME B18.2.1. The confirmed specification table covers 1–7 diameters and 0.5–4.5 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 5, Grade 8; Finish: Zinc Plated, Blackened, Plain. Availability should be confirmed against the selected specification and order quantity.

Where are these flange 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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