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Socket 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 — 123 confirmed sizes to ASME B18.3

Material
Finish
dNominal Diameter (in)lLength (in)sHex Socket Size (in)dkHead Diameter (in)kNominal Head Height (in)dBasic Major Diameter (in)MOQQuantity and inquiry
#6-32 UNC0.250.1090.2260.1380.1383000
#6-32 UNC0.31250.1090.2260.1380.1383000
#6-32 UNC0.3750.1090.2260.1380.1383000
#6-32 UNC0.43750.1090.2260.1380.1383000
#6-32 UNC0.50.1090.2260.1380.1383000
#6-32 UNC0.6250.1090.2260.1380.1383000
#6-32 UNC0.750.1090.2260.1380.1383000
#6-32 UNC0.8750.1090.2260.1380.1383000
#6-32 UNC10.1090.2260.1380.1383000
#6-32 UNC1.1250.1090.2260.1380.1383000
#6-32 UNC1.250.1090.2260.1380.1383000
#6-32 UNC1.3750.1090.2260.1380.1383000
#8-32 UNC0.31250.1410.270.1640.1643000
#8-32 UNC0.3750.1410.270.1640.1643000
#8-32 UNC0.43750.1410.270.1640.1643000
#8-32 UNC0.50.1410.270.1640.1643000

Showing 16 of 123 sizes

#6-32 UNC × 0.25 × 0.109 × 0.226 × 0.138 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.216 × 0.134 × 0.013 × 0.064 × 0.047 × 0.008

dNominal Diameter (in)#6-32 UNC
lLength (in)0.25
sHex Socket Size (in)0.109
dkHead Diameter (in)0.226
kNominal Head Height (in)0.138
dBasic Major Diameter (in)0.138
MOQ3000

#6-32 UNC × 0.3125 × 0.109 × 0.226 × 0.138 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.216 × 0.134 × 0.013 × 0.064 × 0.047 × 0.008

dNominal Diameter (in)#6-32 UNC
lLength (in)0.3125
sHex Socket Size (in)0.109
dkHead Diameter (in)0.226
kNominal Head Height (in)0.138
dBasic Major Diameter (in)0.138
MOQ3000

#6-32 UNC × 0.375 × 0.109 × 0.226 × 0.138 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.216 × 0.134 × 0.013 × 0.064 × 0.047 × 0.008

dNominal Diameter (in)#6-32 UNC
lLength (in)0.375
sHex Socket Size (in)0.109
dkHead Diameter (in)0.226
kNominal Head Height (in)0.138
dBasic Major Diameter (in)0.138
MOQ3000

#6-32 UNC × 0.4375 × 0.109 × 0.226 × 0.138 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.216 × 0.134 × 0.013 × 0.064 × 0.047 × 0.008

dNominal Diameter (in)#6-32 UNC
lLength (in)0.4375
sHex Socket Size (in)0.109
dkHead Diameter (in)0.226
kNominal Head Height (in)0.138
dBasic Major Diameter (in)0.138
MOQ3000

#6-32 UNC × 0.5 × 0.109 × 0.226 × 0.138 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.216 × 0.134 × 0.013 × 0.064 × 0.047 × 0.008

dNominal Diameter (in)#6-32 UNC
lLength (in)0.5
sHex Socket Size (in)0.109
dkHead Diameter (in)0.226
kNominal Head Height (in)0.138
dBasic Major Diameter (in)0.138
MOQ3000

#6-32 UNC × 0.625 × 0.109 × 0.226 × 0.138 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.216 × 0.134 × 0.013 × 0.064 × 0.047 × 0.008

dNominal Diameter (in)#6-32 UNC
lLength (in)0.625
sHex Socket Size (in)0.109
dkHead Diameter (in)0.226
kNominal Head Height (in)0.138
dBasic Major Diameter (in)0.138
MOQ3000

#6-32 UNC × 0.75 × 0.109 × 0.226 × 0.138 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.216 × 0.134 × 0.013 × 0.064 × 0.047 × 0.008

dNominal Diameter (in)#6-32 UNC
lLength (in)0.75
sHex Socket Size (in)0.109
dkHead Diameter (in)0.226
kNominal Head Height (in)0.138
dBasic Major Diameter (in)0.138
MOQ3000

#6-32 UNC × 0.875 × 0.109 × 0.226 × 0.138 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.216 × 0.134 × 0.013 × 0.064 × 0.047 × 0.008

dNominal Diameter (in)#6-32 UNC
lLength (in)0.875
sHex Socket Size (in)0.109
dkHead Diameter (in)0.226
kNominal Head Height (in)0.138
dBasic Major Diameter (in)0.138
MOQ3000

#6-32 UNC × 1 × 0.109 × 0.226 × 0.138 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.216 × 0.134 × 0.013 × 0.064 × 0.047 × 0.008

dNominal Diameter (in)#6-32 UNC
lLength (in)1
sHex Socket Size (in)0.109
dkHead Diameter (in)0.226
kNominal Head Height (in)0.138
dBasic Major Diameter (in)0.138
MOQ3000

#6-32 UNC × 1.125 × 0.109 × 0.226 × 0.138 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.216 × 0.134 × 0.013 × 0.064 × 0.047 × 0.008

dNominal Diameter (in)#6-32 UNC
lLength (in)1.125
sHex Socket Size (in)0.109
dkHead Diameter (in)0.226
kNominal Head Height (in)0.138
dBasic Major Diameter (in)0.138
MOQ3000

#6-32 UNC × 1.25 × 0.109 × 0.226 × 0.138 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.216 × 0.134 × 0.013 × 0.064 × 0.047 × 0.008

dNominal Diameter (in)#6-32 UNC
lLength (in)1.25
sHex Socket Size (in)0.109
dkHead Diameter (in)0.226
kNominal Head Height (in)0.138
dBasic Major Diameter (in)0.138
MOQ3000

#6-32 UNC × 1.375 × 0.109 × 0.226 × 0.138 × 0.138 × 32 × UNC × 3A × 0.138 × 0.1329 × 0.216 × 0.134 × 0.013 × 0.064 × 0.047 × 0.008

dNominal Diameter (in)#6-32 UNC
lLength (in)1.375
sHex Socket Size (in)0.109
dkHead Diameter (in)0.226
kNominal Head Height (in)0.138
dBasic Major Diameter (in)0.138
MOQ3000

#8-32 UNC × 0.3125 × 0.141 × 0.27 × 0.164 × 0.164 × 32 × UNC × 3A × 0.164 × 0.1585 × 0.257 × 0.159 × 0.014 × 0.077 × 0.056 × 0.008

dNominal Diameter (in)#8-32 UNC
lLength (in)0.3125
sHex Socket Size (in)0.141
dkHead Diameter (in)0.27
kNominal Head Height (in)0.164
dBasic Major Diameter (in)0.164
MOQ3000

#8-32 UNC × 0.375 × 0.141 × 0.27 × 0.164 × 0.164 × 32 × UNC × 3A × 0.164 × 0.1585 × 0.257 × 0.159 × 0.014 × 0.077 × 0.056 × 0.008

dNominal Diameter (in)#8-32 UNC
lLength (in)0.375
sHex Socket Size (in)0.141
dkHead Diameter (in)0.27
kNominal Head Height (in)0.164
dBasic Major Diameter (in)0.164
MOQ3000

#8-32 UNC × 0.4375 × 0.141 × 0.27 × 0.164 × 0.164 × 32 × UNC × 3A × 0.164 × 0.1585 × 0.257 × 0.159 × 0.014 × 0.077 × 0.056 × 0.008

dNominal Diameter (in)#8-32 UNC
lLength (in)0.4375
sHex Socket Size (in)0.141
dkHead Diameter (in)0.27
kNominal Head Height (in)0.164
dBasic Major Diameter (in)0.164
MOQ3000

#8-32 UNC × 0.5 × 0.141 × 0.27 × 0.164 × 0.164 × 32 × UNC × 3A × 0.164 × 0.1585 × 0.257 × 0.159 × 0.014 × 0.077 × 0.056 × 0.008

dNominal Diameter (in)#8-32 UNC
lLength (in)0.5
sHex Socket Size (in)0.141
dkHead Diameter (in)0.27
kNominal Head Height (in)0.164
dBasic Major Diameter (in)0.164
MOQ3000

Product details

Description
Hexagon socket head cap screw manufactured to ASME B18.3. The cylindrical head has a hexagon socket drive and is seated in a counterbored hole. Threads are UNC series, class 3A, with sizes from #6-32 to 3/4-10. Material is alloy steel, supplied with blackened or plain finish. Minimum order quantities vary by diameter. For quotation, specify diameter, thread series, length, finish, and required quantity.
Features
Cylindrical head with hexagon socket drive for internal wrenching · Threaded to UNC class 3A over the full length up to the head · Available in diameters from #6-32 to 3/4-10 · Supplied in alloy steel with blackened or plain finish
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 Socket Head Cap Screw ASME B18.3 do you supply?

Execution standard: ASME B18.3. The confirmed specification table covers 1–10 diameters and 0.25–4.5 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 cap 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 Head Cap Screw ASME B18.3

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