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Socket Button 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)dkHead Diameter (in)kNominal Head Height (in)dBasic Major Diameter (in)TPIThreads Per InchMOQQuantity and inquiry
5/16-18 UNC1.50.5470.1660.3125182000
5/16-18 UNC1.750.5470.1660.3125182000
5/16-18 UNC20.5470.1660.3125182000
5/16-18 UNC2.250.5470.1660.3125182000
5/16-18 UNC2.50.5470.1660.3125182000
3/8-16 UNC0.750.6560.1990.375162000
3/8-16 UNC0.8750.6560.1990.375162000
3/8-16 UNC10.6560.1990.375162000
3/8-16 UNC1.1250.6560.1990.375162000
3/8-16 UNC1.250.6560.1990.375162000
3/8-16 UNC1.3750.6560.1990.375162000
3/8-16 UNC1.50.6560.1990.375162000
3/8-16 UNC1.750.6560.1990.375162000
3/8-16 UNC20.6560.1990.375162000
3/8-16 UNC2.250.6560.1990.375162000
3/8-16 UNC2.50.6560.1990.375162000

Showing 16 of 95 sizes

5/16-18 UNC × 1.5 × 0.547 × 0.166 × 0.3125 × 18 × UNC × 3A × 0.527 × 0.152 × 0.188 × 0.105

dNominal Diameter (in)5/16-18 UNC
lLength (in)1.5
dkHead Diameter (in)0.547
kNominal Head Height (in)0.166
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
MOQ2000

5/16-18 UNC × 1.75 × 0.547 × 0.166 × 0.3125 × 18 × UNC × 3A × 0.527 × 0.152 × 0.188 × 0.105

dNominal Diameter (in)5/16-18 UNC
lLength (in)1.75
dkHead Diameter (in)0.547
kNominal Head Height (in)0.166
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
MOQ2000

5/16-18 UNC × 2 × 0.547 × 0.166 × 0.3125 × 18 × UNC × 3A × 0.527 × 0.152 × 0.188 × 0.105

dNominal Diameter (in)5/16-18 UNC
lLength (in)2
dkHead Diameter (in)0.547
kNominal Head Height (in)0.166
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
MOQ2000

5/16-18 UNC × 2.25 × 0.547 × 0.166 × 0.3125 × 18 × UNC × 3A × 0.527 × 0.152 × 0.188 × 0.105

dNominal Diameter (in)5/16-18 UNC
lLength (in)2.25
dkHead Diameter (in)0.547
kNominal Head Height (in)0.166
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
MOQ2000

5/16-18 UNC × 2.5 × 0.547 × 0.166 × 0.3125 × 18 × UNC × 3A × 0.527 × 0.152 × 0.188 × 0.105

dNominal Diameter (in)5/16-18 UNC
lLength (in)2.5
dkHead Diameter (in)0.547
kNominal Head Height (in)0.166
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
MOQ2000

3/8-16 UNC × 0.75 × 0.656 × 0.199 × 0.375 × 16 × UNC × 3A × 0.636 × 0.185 × 0.219 × 0.122

dNominal Diameter (in)3/8-16 UNC
lLength (in)0.75
dkHead Diameter (in)0.656
kNominal Head Height (in)0.199
dBasic Major Diameter (in)0.375
TPIThreads Per Inch16
MOQ2000

3/8-16 UNC × 0.875 × 0.656 × 0.199 × 0.375 × 16 × UNC × 3A × 0.636 × 0.185 × 0.219 × 0.122

dNominal Diameter (in)3/8-16 UNC
lLength (in)0.875
dkHead Diameter (in)0.656
kNominal Head Height (in)0.199
dBasic Major Diameter (in)0.375
TPIThreads Per Inch16
MOQ2000

3/8-16 UNC × 1 × 0.656 × 0.199 × 0.375 × 16 × UNC × 3A × 0.636 × 0.185 × 0.219 × 0.122

dNominal Diameter (in)3/8-16 UNC
lLength (in)1
dkHead Diameter (in)0.656
kNominal Head Height (in)0.199
dBasic Major Diameter (in)0.375
TPIThreads Per Inch16
MOQ2000

3/8-16 UNC × 1.125 × 0.656 × 0.199 × 0.375 × 16 × UNC × 3A × 0.636 × 0.185 × 0.219 × 0.122

dNominal Diameter (in)3/8-16 UNC
lLength (in)1.125
dkHead Diameter (in)0.656
kNominal Head Height (in)0.199
dBasic Major Diameter (in)0.375
TPIThreads Per Inch16
MOQ2000

3/8-16 UNC × 1.25 × 0.656 × 0.199 × 0.375 × 16 × UNC × 3A × 0.636 × 0.185 × 0.219 × 0.122

dNominal Diameter (in)3/8-16 UNC
lLength (in)1.25
dkHead Diameter (in)0.656
kNominal Head Height (in)0.199
dBasic Major Diameter (in)0.375
TPIThreads Per Inch16
MOQ2000

3/8-16 UNC × 1.375 × 0.656 × 0.199 × 0.375 × 16 × UNC × 3A × 0.636 × 0.185 × 0.219 × 0.122

dNominal Diameter (in)3/8-16 UNC
lLength (in)1.375
dkHead Diameter (in)0.656
kNominal Head Height (in)0.199
dBasic Major Diameter (in)0.375
TPIThreads Per Inch16
MOQ2000

3/8-16 UNC × 1.5 × 0.656 × 0.199 × 0.375 × 16 × UNC × 3A × 0.636 × 0.185 × 0.219 × 0.122

dNominal Diameter (in)3/8-16 UNC
lLength (in)1.5
dkHead Diameter (in)0.656
kNominal Head Height (in)0.199
dBasic Major Diameter (in)0.375
TPIThreads Per Inch16
MOQ2000

3/8-16 UNC × 1.75 × 0.656 × 0.199 × 0.375 × 16 × UNC × 3A × 0.636 × 0.185 × 0.219 × 0.122

dNominal Diameter (in)3/8-16 UNC
lLength (in)1.75
dkHead Diameter (in)0.656
kNominal Head Height (in)0.199
dBasic Major Diameter (in)0.375
TPIThreads Per Inch16
MOQ2000

3/8-16 UNC × 2 × 0.656 × 0.199 × 0.375 × 16 × UNC × 3A × 0.636 × 0.185 × 0.219 × 0.122

dNominal Diameter (in)3/8-16 UNC
lLength (in)2
dkHead Diameter (in)0.656
kNominal Head Height (in)0.199
dBasic Major Diameter (in)0.375
TPIThreads Per Inch16
MOQ2000

3/8-16 UNC × 2.25 × 0.656 × 0.199 × 0.375 × 16 × UNC × 3A × 0.636 × 0.185 × 0.219 × 0.122

dNominal Diameter (in)3/8-16 UNC
lLength (in)2.25
dkHead Diameter (in)0.656
kNominal Head Height (in)0.199
dBasic Major Diameter (in)0.375
TPIThreads Per Inch16
MOQ2000

3/8-16 UNC × 2.5 × 0.656 × 0.199 × 0.375 × 16 × UNC × 3A × 0.636 × 0.185 × 0.219 × 0.122

dNominal Diameter (in)3/8-16 UNC
lLength (in)2.5
dkHead Diameter (in)0.656
kNominal Head Height (in)0.199
dBasic Major Diameter (in)0.375
TPIThreads Per Inch16
MOQ2000

Product details

Description
Socket button head cap screw manufactured to ASME B18.3. The head has a low rounded profile with a hexagon socket drive. Threads are UNC series, class 3A, in sizes from #6-32 to 3/4-10. Material is alloy steel with blackened or plain finish. Minimum order quantities vary by diameter. For quotation, specify diameter, thread series, length, finish, and required quantity.
Features
Low rounded button head with hexagon socket drive · UNC threads, class 3A, from #6-32 to 3/4-10 · Alloy steel with blackened or plain finish · Minimum order quantities from 1000 to 3000 pieces depending on size
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 Button Head Cap Screw ASME B18.3 do you supply?

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

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

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