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Socket Flat Countersunk Head Cap Screw ASME B18.3

A countersunk head with a hex socket that sits flush in a countersunk hole. The socket takes more tightening torque than a slotted or cross head. Install with a hex key, tightening until the head is flush with the surface. Typical uses include machine guards, jigs, fixtures and moulds.

In stockShips within 3 working daysMade to orderShips within 15 working days

#6-32 UNCAlloy Steel18 variantsH0.097max.J0.078A0.307max.Basic Major Diameter0.138
LengthinFinishStockMOQpcs≈ kg/ 1,000 pcsQuantitypcs
1/4BlackenedIn stock3,0001.12
1/4PlainIn stock3,0001.12
5/16BlackenedIn stock3,0001.21
5/16PlainIn stock3,0001.21
3/8BlackenedIn stock3,0001.30
3/8PlainIn stock3,0001.30
7/16BlackenedIn stock3,0001.39
7/16PlainIn stock3,0001.39
1/2BlackenedIn stock3,0001.47
1/2PlainIn stock3,0001.47
5/8BlackenedIn stock3,0001.65
5/8PlainIn stock3,0001.65
3/4BlackenedIn stock3,0001.82
3/4PlainIn stock3,0001.82
7/8BlackenedIn stock3,0002.00
7/8PlainIn stock3,0002.00
1BlackenedIn stock3,0002.17
1PlainIn stock3,0002.17
Need another length in #6-32 UNC?Made to order · ask for a price
#8-32 UNCAlloy Steel20 variantsH0.112max.J0.094A0.359max.Basic Major Diameter0.164
LengthinFinishStockMOQpcs≈ kg/ 1,000 pcsQuantitypcs
5/16BlackenedIn stock3,0001.88
5/16PlainIn stock3,0001.88
3/8BlackenedIn stock3,0002.01
3/8PlainIn stock3,0002.01
7/16BlackenedIn stock3,0002.14
7/16PlainIn stock3,0002.14
1/2BlackenedIn stock3,0002.27
1/2PlainIn stock3,0002.27
5/8BlackenedIn stock3,0002.53
5/8PlainIn stock3,0002.53
3/4BlackenedIn stock3,0002.79
3/4PlainIn stock3,0002.79
7/8BlackenedIn stock3,0003.05
7/8PlainIn stock3,0003.05
1BlackenedIn stock3,0003.31
1PlainIn stock3,0003.31
1-1/8BlackenedIn stock3,0003.57
1-1/8PlainIn stock3,0003.57
1-1/4BlackenedIn stock3,0003.83
1-1/4PlainIn stock3,0003.83
Need another length in #8-32 UNC?Made to order · ask for a price
#10-24 UNCAlloy Steel22 variantsH0.127max.J0.125A0.411max.Basic Major Diameter0.19
LengthinFinishStockMOQpcs≈ kg/ 1,000 pcsQuantitypcs
3/8BlackenedIn stock3,0002.82
3/8PlainIn stock3,0002.82
7/16BlackenedIn stock3,0002.99
7/16PlainIn stock3,0002.99
1/2BlackenedIn stock3,0003.16
1/2PlainIn stock3,0003.16
5/8BlackenedIn stock3,0003.49
5/8PlainIn stock3,0003.49
3/4BlackenedIn stock3,0003.83
3/4PlainIn stock3,0003.83
7/8BlackenedIn stock3,0004.17
7/8PlainIn stock3,0004.17
1BlackenedIn stock3,0004.50
1PlainIn stock3,0004.50
1-1/8BlackenedIn stock3,0004.84
1-1/8PlainIn stock3,0004.84
1-1/4BlackenedIn stock3,0005.17
1-1/4PlainIn stock3,0005.17
1-3/8BlackenedIn stock3,0005.51
1-3/8PlainIn stock3,0005.51
1-1/2BlackenedIn stock3,0005.84
1-1/2PlainIn stock3,0005.84
Need another length in #10-24 UNC?Made to order · ask for a price
1/4-20 UNCAlloy Steel22 variantsH0.161max.J0.156A0.531max.Basic Major Diameter0.25
LengthinFinishStockMOQpcs≈ kg/ 1,000 pcsQuantitypcs
1/2BlackenedIn stock2,0006.24
1/2PlainIn stock2,0006.24
5/8BlackenedIn stock2,0006.84
5/8PlainIn stock2,0006.84
3/4BlackenedIn stock2,0007.43
3/4PlainIn stock2,0007.43
7/8BlackenedIn stock2,0008.03
7/8PlainIn stock2,0008.03
1BlackenedIn stock2,0008.63
1PlainIn stock2,0008.63
1-1/8BlackenedIn stock2,0009.23
1-1/8PlainIn stock2,0009.23
1-1/4BlackenedIn stock2,0009.82
1-1/4PlainIn stock2,0009.82
1-3/8BlackenedIn stock2,00010.42
1-3/8PlainIn stock2,00010.42
1-1/2BlackenedIn stock2,00011.02
1-1/2PlainIn stock2,00011.02
1-3/4BlackenedIn stock2,00012.21
1-3/4PlainIn stock2,00012.21
2BlackenedIn stock2,00013.41
2PlainIn stock2,00013.41
Need another length in 1/4-20 UNC?Made to order · ask for a price
5/16-18 UNCAlloy Steel24 variantsH0.198max.J0.188A0.656max.Basic Major Diameter0.3125
LengthinFinishStockMOQpcs≈ kg/ 1,000 pcsQuantitypcs
5/8BlackenedIn stock2,00012.05
5/8PlainIn stock2,00012.05
3/4BlackenedIn stock2,00013.01
3/4PlainIn stock2,00013.01
7/8BlackenedIn stock2,00013.98
7/8PlainIn stock2,00013.98
1BlackenedIn stock2,00014.94
1PlainIn stock2,00014.94
1-1/8BlackenedIn stock2,00015.91
1-1/8PlainIn stock2,00015.91
1-1/4BlackenedIn stock2,00016.87
1-1/4PlainIn stock2,00016.87
1-3/8BlackenedIn stock2,00017.84
1-3/8PlainIn stock2,00017.84
1-1/2BlackenedIn stock2,00018.80
1-1/2PlainIn stock2,00018.80
1-3/4BlackenedIn stock2,00020.73
1-3/4PlainIn stock2,00020.73
2BlackenedIn stock2,00022.66
2PlainIn stock2,00022.66
2-1/4BlackenedIn stock2,00024.59
2-1/4PlainIn stock2,00024.59
2-1/2BlackenedIn stock2,00026.52
2-1/2PlainIn stock2,00026.52
Need another length in 5/16-18 UNC?Made to order · ask for a price
3/8-16 UNCAlloy Steel26 variantsH0.234max.J0.219A0.781max.Basic Major Diameter0.375
LengthinFinishStockMOQpcs≈ kg/ 1,000 pcsQuantitypcs
3/4BlackenedIn stock2,00020.57
3/4PlainIn stock2,00020.57
7/8BlackenedIn stock2,00021.98
7/8PlainIn stock2,00021.98
1BlackenedIn stock2,00023.40
1PlainIn stock2,00023.40
1-1/8BlackenedIn stock2,00024.81
1-1/8PlainIn stock2,00024.81
1-1/4BlackenedIn stock2,00026.22
1-1/4PlainIn stock2,00026.22
1-3/8BlackenedIn stock2,00027.63
1-3/8PlainIn stock2,00027.63
1-1/2BlackenedIn stock2,00029.05
1-1/2PlainIn stock2,00029.05
1-3/4BlackenedIn stock2,00031.87
1-3/4PlainIn stock2,00031.87
2BlackenedIn stock2,00034.70
2PlainIn stock2,00034.70
2-1/4BlackenedIn stock2,00037.52
2-1/4PlainIn stock2,00037.52
2-1/2BlackenedIn stock2,00040.34
2-1/2PlainIn stock2,00040.34
2-3/4BlackenedIn stock2,00043.17
2-3/4PlainIn stock2,00043.17
3BlackenedIn stock2,00045.99
3PlainIn stock2,00045.99
Need another length in 3/8-16 UNC?Made to order · ask for a price
1/2-13 UNCAlloy Steel22 variantsH0.251max.J0.312A0.938max.Basic Major Diameter0.5
LengthinFinishStockMOQpcs≈ kg/ 1,000 pcsQuantitypcs
1BlackenedIn stock1,50039.18
1PlainIn stock1,50039.18
1-1/8BlackenedIn stock1,50041.74
1-1/8PlainIn stock1,50041.74
1-1/4BlackenedIn stock1,50044.30
1-1/4PlainIn stock1,50044.30
1-3/8BlackenedIn stock1,50046.86
1-3/8PlainIn stock1,50046.86
1-1/2BlackenedIn stock1,50049.41
1-1/2PlainIn stock1,50049.41
1-3/4BlackenedIn stock1,50054.53
1-3/4PlainIn stock1,50054.53
2BlackenedIn stock1,50059.65
2PlainIn stock1,50059.65
2-1/4BlackenedIn stock1,50064.76
2-1/4PlainIn stock1,50064.76
2-1/2BlackenedIn stock1,50069.88
2-1/2PlainIn stock1,50069.88
2-3/4BlackenedIn stock1,50074.99
2-3/4PlainIn stock1,50074.99
3BlackenedIn stock1,50080.11
3PlainIn stock1,50080.11
Need another length in 1/2-13 UNC?Made to order · ask for a price
5/8-11 UNCAlloy Steel16 variantsH0.324max.J0.375A1.188max.Basic Major Diameter0.625
LengthinFinishStockMOQpcs≈ kg/ 1,000 pcsQuantitypcs
1-1/4BlackenedIn stock1,00079.21
1-1/4PlainIn stock1,00079.21
1-1/2BlackenedIn stock1,00087.30
1-1/2PlainIn stock1,00087.30
1-3/4BlackenedIn stock1,00095.39
1-3/4PlainIn stock1,00095.39
Need another length in 5/8-11 UNC?Made to order · ask for a price

184 combinations shown

Matching components

Hex Nut ASME B18.2.2Inch Hex NutASME B18.2.2 · 1/4-20UNC–7/8-9UNCHex Jam Nut ASME B18.2.2Inch Hex Jam NutASME B18.2.2 · 1/4-20UNC–7/8-9UNC

Order assurance

Reports & inspection

  • 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

  • Bulk carton packing
  • Small boxes with outer cartons
  • Palletized shipment
  • Fumigation-free pallets
  • Inner poly bags
  • Buyer branding and labels

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