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Socket Flat Countersunk Head Cap Screw ASME B18.3

ASME B18.3 (Current)

Material
Alloy Steel
Finish
Blackened, Plain
Size range
#6-32UNC, #8-32UNC, #10-24UNC + 6 more
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Select sizes and quantities — 95 confirmed sizes to ASME B18.3

Material
Finish
dNominal Diameter (in)lLength (in)sHex Socket Size (in)dkHead Diameter (in)dBasic Major Diameter (in)TPIThreads Per InchMOQQuantity and inquiry
#6-32 UNC0.250.0780.3070.138323000
#6-32 UNC0.31250.0780.3070.138323000
#6-32 UNC0.3750.0780.3070.138323000
#6-32 UNC0.43750.0780.3070.138323000
#6-32 UNC0.50.0780.3070.138323000
#6-32 UNC0.6250.0780.3070.138323000
#6-32 UNC0.750.0780.3070.138323000
#6-32 UNC0.8750.0780.3070.138323000
#6-32 UNC10.0780.3070.138323000
#8-32 UNC0.31250.0940.3590.164323000
#8-32 UNC0.3750.0940.3590.164323000
#8-32 UNC0.43750.0940.3590.164323000
#8-32 UNC0.50.0940.3590.164323000
#8-32 UNC0.6250.0940.3590.164323000
#8-32 UNC0.750.0940.3590.164323000
#8-32 UNC0.8750.0940.3590.164323000

Showing 16 of 95 sizes

#6-32 UNC × 0.25 × 0.078 × 0.307 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.263 × 0.097 × 0.066

dNominal Diameter (in)#6-32 UNC
lLength (in)0.25
sHex Socket Size (in)0.078
dkHead Diameter (in)0.307
dBasic Major Diameter (in)0.138
TPIThreads Per Inch32
MOQ3000

#6-32 UNC × 0.3125 × 0.078 × 0.307 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.263 × 0.097 × 0.066

dNominal Diameter (in)#6-32 UNC
lLength (in)0.3125
sHex Socket Size (in)0.078
dkHead Diameter (in)0.307
dBasic Major Diameter (in)0.138
TPIThreads Per Inch32
MOQ3000

#6-32 UNC × 0.375 × 0.078 × 0.307 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.263 × 0.097 × 0.066

dNominal Diameter (in)#6-32 UNC
lLength (in)0.375
sHex Socket Size (in)0.078
dkHead Diameter (in)0.307
dBasic Major Diameter (in)0.138
TPIThreads Per Inch32
MOQ3000

#6-32 UNC × 0.4375 × 0.078 × 0.307 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.263 × 0.097 × 0.066

dNominal Diameter (in)#6-32 UNC
lLength (in)0.4375
sHex Socket Size (in)0.078
dkHead Diameter (in)0.307
dBasic Major Diameter (in)0.138
TPIThreads Per Inch32
MOQ3000

#6-32 UNC × 0.5 × 0.078 × 0.307 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.263 × 0.097 × 0.066

dNominal Diameter (in)#6-32 UNC
lLength (in)0.5
sHex Socket Size (in)0.078
dkHead Diameter (in)0.307
dBasic Major Diameter (in)0.138
TPIThreads Per Inch32
MOQ3000

#6-32 UNC × 0.625 × 0.078 × 0.307 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.263 × 0.097 × 0.066

dNominal Diameter (in)#6-32 UNC
lLength (in)0.625
sHex Socket Size (in)0.078
dkHead Diameter (in)0.307
dBasic Major Diameter (in)0.138
TPIThreads Per Inch32
MOQ3000

#6-32 UNC × 0.75 × 0.078 × 0.307 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.263 × 0.097 × 0.066

dNominal Diameter (in)#6-32 UNC
lLength (in)0.75
sHex Socket Size (in)0.078
dkHead Diameter (in)0.307
dBasic Major Diameter (in)0.138
TPIThreads Per Inch32
MOQ3000

#6-32 UNC × 0.875 × 0.078 × 0.307 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.263 × 0.097 × 0.066

dNominal Diameter (in)#6-32 UNC
lLength (in)0.875
sHex Socket Size (in)0.078
dkHead Diameter (in)0.307
dBasic Major Diameter (in)0.138
TPIThreads Per Inch32
MOQ3000

#6-32 UNC × 1 × 0.078 × 0.307 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.263 × 0.097 × 0.066

dNominal Diameter (in)#6-32 UNC
lLength (in)1
sHex Socket Size (in)0.078
dkHead Diameter (in)0.307
dBasic Major Diameter (in)0.138
TPIThreads Per Inch32
MOQ3000

#8-32 UNC × 0.3125 × 0.094 × 0.359 × 0.164 × 32 × UNC × 3A × 0.164 × 0.1585 × 0.311 × 0.112 × 0.076

dNominal Diameter (in)#8-32 UNC
lLength (in)0.3125
sHex Socket Size (in)0.094
dkHead Diameter (in)0.359
dBasic Major Diameter (in)0.164
TPIThreads Per Inch32
MOQ3000

#8-32 UNC × 0.375 × 0.094 × 0.359 × 0.164 × 32 × UNC × 3A × 0.164 × 0.1585 × 0.311 × 0.112 × 0.076

dNominal Diameter (in)#8-32 UNC
lLength (in)0.375
sHex Socket Size (in)0.094
dkHead Diameter (in)0.359
dBasic Major Diameter (in)0.164
TPIThreads Per Inch32
MOQ3000

#8-32 UNC × 0.4375 × 0.094 × 0.359 × 0.164 × 32 × UNC × 3A × 0.164 × 0.1585 × 0.311 × 0.112 × 0.076

dNominal Diameter (in)#8-32 UNC
lLength (in)0.4375
sHex Socket Size (in)0.094
dkHead Diameter (in)0.359
dBasic Major Diameter (in)0.164
TPIThreads Per Inch32
MOQ3000

#8-32 UNC × 0.5 × 0.094 × 0.359 × 0.164 × 32 × UNC × 3A × 0.164 × 0.1585 × 0.311 × 0.112 × 0.076

dNominal Diameter (in)#8-32 UNC
lLength (in)0.5
sHex Socket Size (in)0.094
dkHead Diameter (in)0.359
dBasic Major Diameter (in)0.164
TPIThreads Per Inch32
MOQ3000

#8-32 UNC × 0.625 × 0.094 × 0.359 × 0.164 × 32 × UNC × 3A × 0.164 × 0.1585 × 0.311 × 0.112 × 0.076

dNominal Diameter (in)#8-32 UNC
lLength (in)0.625
sHex Socket Size (in)0.094
dkHead Diameter (in)0.359
dBasic Major Diameter (in)0.164
TPIThreads Per Inch32
MOQ3000

#8-32 UNC × 0.75 × 0.094 × 0.359 × 0.164 × 32 × UNC × 3A × 0.164 × 0.1585 × 0.311 × 0.112 × 0.076

dNominal Diameter (in)#8-32 UNC
lLength (in)0.75
sHex Socket Size (in)0.094
dkHead Diameter (in)0.359
dBasic Major Diameter (in)0.164
TPIThreads Per Inch32
MOQ3000

#8-32 UNC × 0.875 × 0.094 × 0.359 × 0.164 × 32 × UNC × 3A × 0.164 × 0.1585 × 0.311 × 0.112 × 0.076

dNominal Diameter (in)#8-32 UNC
lLength (in)0.875
sHex Socket Size (in)0.094
dkHead Diameter (in)0.359
dBasic Major Diameter (in)0.164
TPIThreads Per Inch32
MOQ3000

Product details

Description
Socket flat countersunk head cap screw manufactured to ASME B18.3. The head is flat with a countersunk bearing surface and a hexagon socket drive. Threads are UNC with class 3A fit. Supplied in alloy steel with blackened or plain finish. Sizes from #6-32 UNC to 3/4-10 UNC. Minimum order quantities vary by diameter. For quotation, specify diameter, thread series, length, material, and finish.
Features
Flat countersunk head with hexagon socket drive · UNC threads with class 3A fit · Available in alloy steel with blackened or plain finish · Sizes from #6-32 UNC to 3/4-10 UNC
Applications
Machine tool and jig assembly, Compact joints where a counterbored seat is used, Automation and equipment frames, Mould and die assembly

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 ASME B18.3 countersunk socket screws do you supply?

Execution standard: ASME B18.3. The confirmed specification table covers 1–10 diameters and 0.25–3 lengths. Use the specification table to select the exact variant required for quotation.

Which materials, grades and finishes can I order?

Material: Alloy Steel; Finish: Blackened, Plain. Availability should be confirmed against the selected specification and order quantity.

Where are these countersunk socket screws typically used?

Typical applications include Machine tool and jig assembly, Compact joints where a counterbored seat is used, Automation and equipment frames, Mould and die assembly. Final suitability depends on the selected material, grade, finish and operating conditions.

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Quote Socket Flat Countersunk Head Cap Screw ASME B18.3

Add sizes, quantities, destination and any drawing or spreadsheet.

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