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Socket Set Screws

Socket Set Screws

Certain applications require a screw that is buried completely in a tapped hole in one of the material surfaces. This is a job for a socket set screw. An important consideration when choosing a socket set screw is how it will interact with the material at the bottom of the hole. If the set screw is to “dig-in”, a point style which features minimal surface area works best. These point styles would include cup, cone or knurled cup. If minimal marring of the surface is required, flat, full dog or half dog would be the point style of choice. Cup point is the most common style in inventory at Nickel Systems.

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Specifications & Technical Data

Cup & Flat Point Dimensions

Nominal Size (Basic Screw Diameter) J
 T C
Nominal Hexagon Socket Size Minimum Key Engagement Cup and Flat Point Diameters
Hex Socket, TH Max Min
5 (0.1250) 1/16 0.062 0.080 0.067 0.057
6 (0.1380) 1/16 0.062 0.080 0.074 0.064
8 (0.1640) 5/64 0.078 0.090 0.087 0.076
10 (0.1900) 3/32 0.094 0.100 0.102 0.088
1/4 (0.2500) 1/8 0.125 0.125 0.132 0.118
5/16 (0.3125) 5/32 0.156 0.156 0.172 0.156
3/8 (0.3750) 3/16 0.188 0.188 0.212 0.194
7/16 (0.4375) 7/32 0.219 0.219 0.252 0.232
1/2 (0.5000) 1/4 0.250 0.250 0.291 0.270
5/8 (0.6250) 5/16 0.312 0.312 0.371 0.347
3/4 (0.7500) 3/8 0.375 0.375 0.450 0.425
7/8 (0.8750) 1/2 0.500 0.500 0.530 0.502
1 (1.0000) 9/16 0.562 0.562 0.609 0.579
1-1/8 (1.1250) 9/16 0.562 0.562 0.689 0.655
1-1/4 (1.2500) 5/8 0.625 0.625 0.767 0.733
1-3/8 (1.3750) 5/8 0.625 0.625 0.848 0.808
1-1/2 (1.5000) 3/4 0.750 0.750 0.926 0.886
1-3/4 (1.7500) 1 1.000 1.000 1.086 1.039
2 (2.000) 1 1.000 1.000 1.244 1.193

 

Cone & Oval Dimensions

Nominal Size (Basic Screw Diameter) J T R Y
Nominal Hexagon Socket Size Minimum Key Engagement  Basic Oval Point Radius Cone Point Angle 90 deg ± 2 deg for These Nominal Lengths or Longer: 118 deg ± 2 deg for Shorter Nominal
Hex Socket, TH
5 (0.1250) 1/16 0.062 0.080 0.094 0.19
6 (0.1380) 1/16 0.062 0.080 0.104 0.19
8 (0.1640) 5/64 0.078 0.090 0.123 0.25
10 (0.1900) 3/32 0.094 0.100 0.142 0.25
1/4 (0.2500) 1/8 0.125 0.125 0.188 0.31
5/16 (0.3125) 5/32 0.156 0.156 0.234 0.38
3/8 (0.3750) 3/16 0.188 0.188 0.281 0.44
7/16 (0.4375) 7/32 0.219 0.219 0.328 0.50
1/2 (0.5000) 1/4 0.250 0.250 0.375 0.57
5/8 (0.6250) 5/16 0.312 0.312 0.469 0.75
3/4 (0.7500) 3/8 0.375 0.375 0.562 0.88
7/8 (0.8750) 1/2 0.500 0.500 0.656 1.00
1 (1.0000) 9/16 0.562 0.562 0.750 1.13
1-1/8 (1.1250) 9/16 0.562 0.562 0.844 1.25
1-1/4 (1.2500) 5/8 0.625 0.625 0.938 1.50
1-3/8 (1.3750) 5/8 0.625 0.625 1.031 1.63
1-1/2 (1.5000) 3/4 0.750 0.750 1.125 1.75
1-3/4 (1.7500) 1 1.000 1.000 1.312 2.00
2 (2.000) 1 1.000 1.000 1.500 2.25

 

Half Dog Point Dimensions

Nominal Size (Basic Screw Diameter) J
 T P Q
Nominal Hexagon Socket Size Minimum Key Engagement Diameter Length
Hex Socket, TH Max Min Max Min
5 (0.1250) 1/16 0.062 0.080 0.083 0.078 0.033 0.027
6 (0.1380) 1/16 0.062 0.080 0.092 0.087 0.038 0.032
8 (0.1640) 5/64 0.078 0.090 0.109 0.103 0.043 0.037
10 (0.1900) 3/32 0.094 0.100 0.127 0.120 0.049 0.041
1/4 (0.2500) 1/8 0.125 0.125 0.156 0.149 0.067 0.059
5/16 (0.3125) 5/32 0.156 0.156 0.203 0.195 0.082 0.074
3/8 (0.3750) 3/16 0.188 0.188 0.250 0.241 0.099 0.089
7/16 (0.4375) 7/32 0.219 0.219 0.297 0.287 0.114 0.104
1/2 (0.5000) 1/4 0.250 0.250 0.344 0.334 0.130 0.120
5/8 (0.6250) 5/16 0.312 0.312 0.469 0.456 0.164 0.148
3/4 (0.7500) 3/8 0.375 0.375 0.562 0.549 0.196 0.180
7/8 (0.8750) 1/2 0.500 0.500 0.656 0.642 0.227 0.211
1 (1.0000) 9/16 0.562 0.562 0.750 0.734 0.260 0.240
1-1/8 (1.1250) 9/16 0.562 0.562 0.844 0.826 0.291 0.271
1-1/4 (1.2500) 5/8 0.625 0.625 0.938 0.920 0.323 0.303
1-3/8 (1.3750) 5/8 0.625 0.625 1.031 1.011 0.354 0.334
1-1/2 (1.5000) 3/4 0.750 0.750 1.125 1.105 0.385 0.365
1-3/4 (1.7500) 1 1.000 1.000 1.312 1.289 0.448 0.428
2 (2.000) 1 1.000 1.000 1.500 1.474 0.510 0.490

 

Socket Set Screw Specifications

  • Standard (ASME/ANSI)
    • ASME B18.3-2012
  • Metric (IFI)

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Socket Set Screws Available Materials

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Industries We Serve

Nickel Systems provides high quality exotic grade materials that hold up in the toughest, most severe heat and corrosive environments. With our large inventory of specialty fasteners in stock, we are always ready to answer the call to serve the most challenging applications.

Nickel Systems maintains an inventory of split lock washers in Hastelloy® (Alloys C276, C22, B2), Carpenter® 20 (Alloy 20), 18-8 and 316 Stainless. Current inventory includes 317L Stainless, K-Monel® (Alloy 500) and AL6XN®. Additionally, we can re-machine certain sizes to produce hi-collar lock washers for use with socket head cap screws.

Air Pollution Control
Chemical Processing
Electronics & Semi-conductors
Power Generation
Water Systems
Pulp & Paper Mills
Oil & Gas
Pumps & Seals
Aerospace
Valves
Glass Manufacturing

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