1/4-20 UNC × 1 × 0.125 × 0.25 × 20 × UNC × 3A × 0.125
dNominal Diameter (in)1/4-20 UNC
lLength (in)1
sHex Socket Size (in)0.125
dBasic Major Diameter (in)0.25
TPIThreads Per Inch20
Thread SeriesUNC
MOQ2000
Flat Point Socket Set Screw ASME B18.3
ASME B18.3 (Current)
- Material
- Alloy Steel
- Finish
- Blackened, Plain
- Size range
- #6-32UNC, #8-32UNC, #10-24UNC + 6 more
Share
Select sizes and quantities — 87 confirmed sizes to ASME B18.3
Material
Finish
| dNominal Diameter (in) | lLength (in) | sHex Socket Size (in) | dBasic Major Diameter (in) | TPIThreads Per Inch | Thread Series | MOQ | Quantity and inquiry |
|---|---|---|---|---|---|---|---|
| 1/4-20 UNC | 1 | 0.125 | 0.25 | 20 | UNC | 2000 | |
| 1/4-20 UNC | 1.125 | 0.125 | 0.25 | 20 | UNC | 2000 | |
| 1/4-20 UNC | 1.25 | 0.125 | 0.25 | 20 | UNC | 2000 | |
| 1/4-20 UNC | 1.375 | 0.125 | 0.25 | 20 | UNC | 2000 | |
| 5/16-18 UNC | 0.3125 | 0.156 | 0.3125 | 18 | UNC | 2000 | |
| 5/16-18 UNC | 0.375 | 0.156 | 0.3125 | 18 | UNC | 2000 | |
| 5/16-18 UNC | 0.4375 | 0.156 | 0.3125 | 18 | UNC | 2000 | |
| 5/16-18 UNC | 0.5 | 0.156 | 0.3125 | 18 | UNC | 2000 | |
| 5/16-18 UNC | 0.625 | 0.156 | 0.3125 | 18 | UNC | 2000 | |
| 5/16-18 UNC | 0.75 | 0.156 | 0.3125 | 18 | UNC | 2000 | |
| 5/16-18 UNC | 0.875 | 0.156 | 0.3125 | 18 | UNC | 2000 | |
| 5/16-18 UNC | 1 | 0.156 | 0.3125 | 18 | UNC | 2000 | |
| 5/16-18 UNC | 1.125 | 0.156 | 0.3125 | 18 | UNC | 2000 | |
| 5/16-18 UNC | 1.25 | 0.156 | 0.3125 | 18 | UNC | 2000 | |
| 5/16-18 UNC | 1.375 | 0.156 | 0.3125 | 18 | UNC | 2000 | |
| 5/16-18 UNC | 1.5 | 0.156 | 0.3125 | 18 | UNC | 2000 |
Showing 16 of 87 sizes
1/4-20 UNC × 1.125 × 0.125 × 0.25 × 20 × UNC × 3A × 0.125
dNominal Diameter (in)1/4-20 UNC
lLength (in)1.125
sHex Socket Size (in)0.125
dBasic Major Diameter (in)0.25
TPIThreads Per Inch20
Thread SeriesUNC
MOQ2000
1/4-20 UNC × 1.25 × 0.125 × 0.25 × 20 × UNC × 3A × 0.125
dNominal Diameter (in)1/4-20 UNC
lLength (in)1.25
sHex Socket Size (in)0.125
dBasic Major Diameter (in)0.25
TPIThreads Per Inch20
Thread SeriesUNC
MOQ2000
1/4-20 UNC × 1.375 × 0.125 × 0.25 × 20 × UNC × 3A × 0.125
dNominal Diameter (in)1/4-20 UNC
lLength (in)1.375
sHex Socket Size (in)0.125
dBasic Major Diameter (in)0.25
TPIThreads Per Inch20
Thread SeriesUNC
MOQ2000
5/16-18 UNC × 0.3125 × 0.156 × 0.3125 × 18 × UNC × 3A × 0.156
dNominal Diameter (in)5/16-18 UNC
lLength (in)0.3125
sHex Socket Size (in)0.156
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
Thread SeriesUNC
MOQ2000
5/16-18 UNC × 0.375 × 0.156 × 0.3125 × 18 × UNC × 3A × 0.156
dNominal Diameter (in)5/16-18 UNC
lLength (in)0.375
sHex Socket Size (in)0.156
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
Thread SeriesUNC
MOQ2000
5/16-18 UNC × 0.4375 × 0.156 × 0.3125 × 18 × UNC × 3A × 0.156
dNominal Diameter (in)5/16-18 UNC
lLength (in)0.4375
sHex Socket Size (in)0.156
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
Thread SeriesUNC
MOQ2000
5/16-18 UNC × 0.5 × 0.156 × 0.3125 × 18 × UNC × 3A × 0.156
dNominal Diameter (in)5/16-18 UNC
lLength (in)0.5
sHex Socket Size (in)0.156
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
Thread SeriesUNC
MOQ2000
5/16-18 UNC × 0.625 × 0.156 × 0.3125 × 18 × UNC × 3A × 0.156
dNominal Diameter (in)5/16-18 UNC
lLength (in)0.625
sHex Socket Size (in)0.156
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
Thread SeriesUNC
MOQ2000
5/16-18 UNC × 0.75 × 0.156 × 0.3125 × 18 × UNC × 3A × 0.156
dNominal Diameter (in)5/16-18 UNC
lLength (in)0.75
sHex Socket Size (in)0.156
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
Thread SeriesUNC
MOQ2000
5/16-18 UNC × 0.875 × 0.156 × 0.3125 × 18 × UNC × 3A × 0.156
dNominal Diameter (in)5/16-18 UNC
lLength (in)0.875
sHex Socket Size (in)0.156
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
Thread SeriesUNC
MOQ2000
5/16-18 UNC × 1 × 0.156 × 0.3125 × 18 × UNC × 3A × 0.156
dNominal Diameter (in)5/16-18 UNC
lLength (in)1
sHex Socket Size (in)0.156
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
Thread SeriesUNC
MOQ2000
5/16-18 UNC × 1.125 × 0.156 × 0.3125 × 18 × UNC × 3A × 0.156
dNominal Diameter (in)5/16-18 UNC
lLength (in)1.125
sHex Socket Size (in)0.156
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
Thread SeriesUNC
MOQ2000
5/16-18 UNC × 1.25 × 0.156 × 0.3125 × 18 × UNC × 3A × 0.156
dNominal Diameter (in)5/16-18 UNC
lLength (in)1.25
sHex Socket Size (in)0.156
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
Thread SeriesUNC
MOQ2000
5/16-18 UNC × 1.375 × 0.156 × 0.3125 × 18 × UNC × 3A × 0.156
dNominal Diameter (in)5/16-18 UNC
lLength (in)1.375
sHex Socket Size (in)0.156
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
Thread SeriesUNC
MOQ2000
5/16-18 UNC × 1.5 × 0.156 × 0.3125 × 18 × UNC × 3A × 0.156
dNominal Diameter (in)5/16-18 UNC
lLength (in)1.5
sHex Socket Size (in)0.156
dBasic Major Diameter (in)0.3125
TPIThreads Per Inch18
Thread SeriesUNC
MOQ2000
Product details
- Description
- Flat point socket set screw manufactured to ASME B18.3. The screw has a hexagon socket drive and a flat point, with threads in UNC series and class 3A. Sizes range from #6-32 UNC to 3/4-10 UNC. Material is alloy steel, with blackened or plain finish. Minimum order quantities vary by size. For quotation, specify diameter, thread series, length, finish, and required quantity.
- Features
- Hexagon socket drive for internal wrenching · Flat point for contact on flat surfaces · UNC threads with class 3A fit · Available in sizes #6-32 UNC through 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 Flat Point Socket Set Screw ASME B18.3 do you supply?
Execution standard: ASME B18.3. The confirmed specification table covers 1–10 diameters and 0.25–1.75 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 set 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.
