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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
1/4-20 UNC0.50.3750.280.25201000
1/4-20 UNC0.6250.3750.280.25201000
1/4-20 UNC0.750.3750.280.25201000
1/4-20 UNC0.8750.3750.280.25201000
1/4-20 UNC10.3750.280.25201000
1/4-20 UNC1.1250.3750.280.25201000
1/4-20 UNC1.250.3750.280.25201000
1/4-20 UNC1.3750.3750.280.25201000
1/4-20 UNC1.50.3750.280.25201000
1/4-20 UNC1.750.3750.280.25201000
1/4-20 UNC20.3750.280.25201000
5/16-18 UNC0.6250.50.320.3125181000
5/16-18 UNC0.750.50.320.3125181000
5/16-18 UNC0.8750.50.320.3125181000
5/16-18 UNC10.50.320.3125181000
5/16-18 UNC1.1250.50.320.3125181000

Showing 16 of 93 sizes

1/4-20 UNC × 0.5 × 0.375 × 0.28 × 0.25 × 20 × UNC × 2A × 0.25 × 0.245 × 0.367 × 0.409 × 0.433 × 0.75 × 1

dNominal Diameter (in)1/4-20 UNC
lLength (in)0.5
sWidth Across Flats (max) (in)0.375
kNominal Head Height (in)0.28
dBasic Major Diameter (in)0.25
TPIThreads Per Inch20
MOQ1000

1/4-20 UNC × 0.625 × 0.375 × 0.28 × 0.25 × 20 × UNC × 2A × 0.25 × 0.245 × 0.367 × 0.409 × 0.433 × 0.75 × 1

dNominal Diameter (in)1/4-20 UNC
lLength (in)0.625
sWidth Across Flats (max) (in)0.375
kNominal Head Height (in)0.28
dBasic Major Diameter (in)0.25
TPIThreads Per Inch20
MOQ1000

1/4-20 UNC × 0.75 × 0.375 × 0.28 × 0.25 × 20 × UNC × 2A × 0.25 × 0.245 × 0.367 × 0.409 × 0.433 × 0.75 × 1

dNominal Diameter (in)1/4-20 UNC
lLength (in)0.75
sWidth Across Flats (max) (in)0.375
kNominal Head Height (in)0.28
dBasic Major Diameter (in)0.25
TPIThreads Per Inch20
MOQ1000

1/4-20 UNC × 0.875 × 0.375 × 0.28 × 0.25 × 20 × UNC × 2A × 0.25 × 0.245 × 0.367 × 0.409 × 0.433 × 0.75 × 1

dNominal Diameter (in)1/4-20 UNC
lLength (in)0.875
sWidth Across Flats (max) (in)0.375
kNominal Head Height (in)0.28
dBasic Major Diameter (in)0.25
TPIThreads Per Inch20
MOQ1000

1/4-20 UNC × 1 × 0.375 × 0.28 × 0.25 × 20 × UNC × 2A × 0.25 × 0.245 × 0.367 × 0.409 × 0.433 × 0.75 × 1

dNominal Diameter (in)1/4-20 UNC
lLength (in)1
sWidth Across Flats (max) (in)0.375
kNominal Head Height (in)0.28
dBasic Major Diameter (in)0.25
TPIThreads Per Inch20
MOQ1000

1/4-20 UNC × 1.125 × 0.375 × 0.28 × 0.25 × 20 × UNC × 2A × 0.25 × 0.245 × 0.367 × 0.409 × 0.433 × 0.75 × 1

dNominal Diameter (in)1/4-20 UNC
lLength (in)1.125
sWidth Across Flats (max) (in)0.375
kNominal Head Height (in)0.28
dBasic Major Diameter (in)0.25
TPIThreads Per Inch20
MOQ1000

1/4-20 UNC × 1.25 × 0.375 × 0.28 × 0.25 × 20 × UNC × 2A × 0.25 × 0.245 × 0.367 × 0.409 × 0.433 × 0.75 × 1

dNominal Diameter (in)1/4-20 UNC
lLength (in)1.25
sWidth Across Flats (max) (in)0.375
kNominal Head Height (in)0.28
dBasic Major Diameter (in)0.25
TPIThreads Per Inch20
MOQ1000

1/4-20 UNC × 1.375 × 0.375 × 0.28 × 0.25 × 20 × UNC × 2A × 0.25 × 0.245 × 0.367 × 0.409 × 0.433 × 0.75 × 1

dNominal Diameter (in)1/4-20 UNC
lLength (in)1.375
sWidth Across Flats (max) (in)0.375
kNominal Head Height (in)0.28
dBasic Major Diameter (in)0.25
TPIThreads Per Inch20
MOQ1000

1/4-20 UNC × 1.5 × 0.375 × 0.28 × 0.25 × 20 × UNC × 2A × 0.25 × 0.245 × 0.367 × 0.409 × 0.433 × 0.75 × 1

dNominal Diameter (in)1/4-20 UNC
lLength (in)1.5
sWidth Across Flats (max) (in)0.375
kNominal Head Height (in)0.28
dBasic Major Diameter (in)0.25
TPIThreads Per Inch20
MOQ1000

1/4-20 UNC × 1.75 × 0.375 × 0.28 × 0.25 × 20 × UNC × 2A × 0.25 × 0.245 × 0.367 × 0.409 × 0.433 × 0.75 × 1

dNominal Diameter (in)1/4-20 UNC
lLength (in)1.75
sWidth Across Flats (max) (in)0.375
kNominal Head Height (in)0.28
dBasic Major Diameter (in)0.25
TPIThreads Per Inch20
MOQ1000

1/4-20 UNC × 2 × 0.375 × 0.28 × 0.25 × 20 × UNC × 2A × 0.25 × 0.245 × 0.367 × 0.409 × 0.433 × 0.75 × 1

dNominal Diameter (in)1/4-20 UNC
lLength (in)2
sWidth Across Flats (max) (in)0.375
kNominal Head Height (in)0.28
dBasic Major Diameter (in)0.25
TPIThreads Per Inch20
MOQ1000

5/16-18 UNC × 0.625 × 0.5 × 0.32 × 0.3125 × 18 × UNC × 2A × 0.3125 × 0.3065 × 0.489 × 0.548 × 0.577 × 0.875 × 1.125

dNominal Diameter (in)5/16-18 UNC
lLength (in)0.625
sWidth Across Flats (max) (in)0.5
kNominal Head Height (in)0.32
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
MOQ1000

5/16-18 UNC × 0.75 × 0.5 × 0.32 × 0.3125 × 18 × UNC × 2A × 0.3125 × 0.3065 × 0.489 × 0.548 × 0.577 × 0.875 × 1.125

dNominal Diameter (in)5/16-18 UNC
lLength (in)0.75
sWidth Across Flats (max) (in)0.5
kNominal Head Height (in)0.32
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
MOQ1000

5/16-18 UNC × 0.875 × 0.5 × 0.32 × 0.3125 × 18 × UNC × 2A × 0.3125 × 0.3065 × 0.489 × 0.548 × 0.577 × 0.875 × 1.125

dNominal Diameter (in)5/16-18 UNC
lLength (in)0.875
sWidth Across Flats (max) (in)0.5
kNominal Head Height (in)0.32
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
MOQ1000

5/16-18 UNC × 1 × 0.5 × 0.32 × 0.3125 × 18 × UNC × 2A × 0.3125 × 0.3065 × 0.489 × 0.548 × 0.577 × 0.875 × 1.125

dNominal Diameter (in)5/16-18 UNC
lLength (in)1
sWidth Across Flats (max) (in)0.5
kNominal Head Height (in)0.32
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
MOQ1000

5/16-18 UNC × 1.125 × 0.5 × 0.32 × 0.3125 × 18 × UNC × 2A × 0.3125 × 0.3065 × 0.489 × 0.548 × 0.577 × 0.875 × 1.125

dNominal Diameter (in)5/16-18 UNC
lLength (in)1.125
sWidth Across Flats (max) (in)0.5
kNominal Head Height (in)0.32
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
MOQ1000

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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