Hex Cap Screws 18-8 Stainless Steel

Hex Cap Screws 18-8 Stainless Steel


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Hex Cap Screws 18-8 Stainless Steel

18-8 stainless steel hex cap screws will have a typical composition of 18% chromium and 8% nickel. These percentages exist in 303, 304 and 305 series stainless steels so 18-8 is used at times to designate any and all of those alloy groups. 18-8 stainless steel offers good corrosion resistance and machines easily but will over time stain in coastal environments. They are also acceptable for use in ACQ pressure-treated lumber.

Hex Cap Screws 18-8 Stainless Steel
 
Hex Cap Screws 18-8 Stainless Steel
Nominal or
Basic
Diameter
Body DiameterWidth Across FlatsWidth Across
Corners
Head HeightThread Length
For Bolt Lengths
For
Screw
Lengths
≤ 6 in.
For
Screw
Lengths
> 6 in.
 Max.Min.BasicMax.MinMaxMinBasic.MaxMin.Ref.Ref
1/40.25000.25000.24507/160.4380.4280.5050.4885/320.1630.1500.7501.000
5/160.31250.31250.30651/20.5000.4890.5770.55713/640.2110.1950.8751.125
3/80.37500.37500.36909/160.5620.5510.6500.62815/640.2430.2261.0001.250
7/160.43750.43750.43055/80.6250.6120.7220.6989/320.2910.2721.1251.375
1/20.50000.50000.49303/40.7500.7360.8660.8405/160.3230.3021.2501.500
9/160.56250.56250.554513/160.8120.7980.9380.91023/640.3710.3481.3751.625
5/80.62500.62500.617015/160.9380.9221.0831.05125/640.4030.3781.5001.750
3/40.75000.75000.74101-1/81.1251.1001.2991.25415/320.4830.4551.7502.000
7/80.87500.87500.86601-5/161.3121.2851.5161.46535/640.5630.5312.0002.250
11.00001.00000.99001-1/21.5001.4691.7321.67539/640.6270.5912.2502.500
1-1/81.12501.12501.11401-11/161.6881.6311.9491.85911/160.7180.6582.5002.750
1-1/41.25001.25001.23901-7/81.8751.8122.1652.06625/320.8130.7492.7503.000
1-1/21.50001.50001.48802-1/42.2502.1752.5982.4801-5/160.9740.9023.2503.500

  • Finished Hex Nut
      
     

    Finished Hex Nuts 18-8 Stainless Steel

    18% Chromium, 8% Nickel 
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    Finished Hex Nuts in 18-8 stainless steel are designed for use with stainless steel bolts or screws with a specified minimum tensile strength equal or less than the specified proof stress of the mating nut. 18-8 nuts are made from one of the following austenitic alloys: 303, 303SE, 304, XM7, all of which are characterized as having a chromium content of 18% and nickel content of 8-10%. Hardness of Rockwell B95 - C32 for diameters 1/4 through 5/8. Rockwell B80 - C32 for diameters of 3/4 through 1 inch. Proof load of 100,000 psi for diameters 1/4 through 5/8 and 85,000 psi for diameters 3/4 through 1 inch.
  • Flat Washer
      
     

    Flat Washers 18-8 Stainless Steel

     
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    Designed for use with 18-8 stainless steel screws, bolts and nuts in general industrial applications where parts are subject to corrosion.