Hex Cap Screws 18-8 Stainless Steel 5/16-18"

5/16"-18 Stainless Steel Hex Cap Screws

Diameter - Thread Pitch: 5/16" - 18


  • 5/16"-18
  • Hexagon head designed to be driven by a wrench or socket
  • Also called hex cap bolts, hex bolts, tap bolts or hex cap screws
  • 18-8 Stainless steel hex cap screws offer protection from weather and corrosive environments
  • Rust resistant in freshwater environments
  • For saltwater environments use the 316 stainless steel version

A hex cap screw in smaller sizes may not have a shoulder. When a hex cap screw is fully threaded it can also be referred to as a tap bolt.

Hex Bolts are measured as: Diameter x Thread Pitch x Length from Under Head
FT: Fully Threaded
PT: Partially Threaded


**5/16"-18 Hex Cap Screws listed as PT, usually have a threaded portion of about 7/8".
However, this can vary slightly from manufacturer to manufacturer.

Select Products Below See Product Specifications

NA = "Not Sold In Single Quantity"

Size
Select Package Quantity
SubTotal
Hex Cap Screws 18-8 SS - 5/16-18 x 3/8" FT
SKU #87002
Hex Cap Screws 18-8 SS - 5/16-18 x 3/8" FT
SKU #87002
1
NA
25
$10.75 (0.43/ea)
100
$34.00 (0.34/ea)
1000
$310.00 (0.31/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 1/2" FT
SKU #87012
Hex Cap Screws 18-8 SS - 5/16-18 x 1/2" FT
SKU #87012
1
NA
25
$5.75 (0.23/ea)
100
$20.00 (0.2/ea)
1000
$180.00 (0.18/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 5/8" FT
SKU #87022
Hex Cap Screws 18-8 SS - 5/16-18 x 5/8" FT
SKU #87022
1
NA
25
$6.00 (0.24/ea)
100
$20.00 (0.2/ea)
1000
$180.00 (0.18/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 3/4" FT
SKU #87032
Hex Cap Screws 18-8 SS - 5/16-18 x 3/4" FT
SKU #87032
1
NA
25
$6.25 (0.25/ea)
100
$21.00 (0.21/ea)
1000
$190.00 (0.19/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 7/8" FT
SKU #87042
Hex Cap Screws 18-8 SS - 5/16-18 x 7/8" FT
SKU #87042
1
NA
25
$6.75 (0.27/ea)
100
$22.00 (0.22/ea)
1000
$200.00 (0.2/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 1" FT
SKU #87052
Hex Cap Screws 18-8 SS - 5/16-18 x 1" FT
SKU #87052
1
NA
25
$7.00 (0.28/ea)
100
$23.00 (0.23/ea)
1000
$210.00 (0.21/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 1-1/8" FT
SKU #87062
Hex Cap Screws 18-8 SS - 5/16-18 x 1-1/8" FT
SKU #87062
1
NA
25
$11.25 (0.45/ea)
100
$37.00 (0.37/ea)
1000
$330.00 (0.33/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 1-1/4" FT
SKU #87072
Hex Cap Screws 18-8 SS - 5/16-18 x 1-1/4" FT
SKU #87072
1
NA
25
$9.00 (0.36/ea)
100
$27.00 (0.27/ea)
1000
$240.00 (0.24/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 1-3/8" PT
SKU #87082
Hex Cap Screws 18-8 SS - 5/16-18 x 1-3/8" PT
SKU #87082
1
NA
25
$14.75 (0.59/ea)
100
$49.00 (0.49/ea)
1000
$440.00 (0.44/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 1-1/2" PT
SKU #87092
Hex Cap Screws 18-8 SS - 5/16-18 x 1-1/2" PT
SKU #87092
1
NA
25
$9.50 (0.38/ea)
100
$30.00 (0.3/ea)
1000
$270.00 (0.27/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 1-3/4" PT
SKU #87102
Hex Cap Screws 18-8 SS - 5/16-18 x 1-3/4" PT
SKU #87102
1
NA
25
$11.25 (0.45/ea)
100
$36.00 (0.36/ea)
1000
$320.00 (0.32/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 2" PT
SKU #87112
Hex Cap Screws 18-8 SS - 5/16-18 x 2" PT
SKU #87112
1
NA
25
$12.00 (0.48/ea)
100
$37.00 (0.37/ea)
1000
$330.00 (0.33/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 2-1/4" PT
SKU #87122
Hex Cap Screws 18-8 SS - 5/16-18 x 2-1/4" PT
SKU #87122
1
NA
25
$13.75 (0.55/ea)
100
$46.00 (0.46/ea)
1000
$420.00 (0.42/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 2-1/2" PT
SKU #87132
Hex Cap Screws 18-8 SS - 5/16-18 x 2-1/2" PT
SKU #87132
1
NA
25
$14.75 (0.59/ea)
100
$47.00 (0.47/ea)
1000
$420.00 (0.42/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 2-3/4" PT
SKU #87142
Hex Cap Screws 18-8 SS - 5/16-18 x 2-3/4" PT
SKU #87142
1
NA
25
$22.25 (0.89/ea)
100
$76.00 (0.76/ea)
1000
$680.00 (0.68/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 3" PT
SKU #87152
Hex Cap Screws 18-8 SS - 5/16-18 x 3" PT
SKU #87152
1
NA
25
$16.25 (0.65/ea)
100
$55.00 (0.55/ea)
1000
$500.00 (0.5/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 3-1/4" PT
SKU #87162
Hex Cap Screws 18-8 SS - 5/16-18 x 3-1/4" PT
SKU #87162
1
$0.80 (0.8/ea)
25
$18.00 (0.72/ea)
100
$67.00 (0.67/ea)
1000
$600.00 (0.6/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 3-1/2" PT
SKU #87172
Hex Cap Screws 18-8 SS - 5/16-18 x 3-1/2" PT
SKU #87172
1
$0.83 (0.83/ea)
25
$18.50 (0.74/ea)
100
$69.00 (0.69/ea)
1000
$620.00 (0.62/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 3-3/4" PT
SKU #87182
Hex Cap Screws 18-8 SS - 5/16-18 x 3-3/4" PT
SKU #87182
1
$1.26 (1.26/ea)
25
$28.25 (1.13/ea)
100
$106.00 (1.06/ea)
1000
$940.00 (0.94/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 4" PT
SKU #87192
Hex Cap Screws 18-8 SS - 5/16-18 x 4" PT
SKU #87192
1
$0.87 (0.87/ea)
25
$19.50 (0.78/ea)
100
$75.00 (0.75/ea)
1000
$670.00 (0.67/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 4-1/4" PT
SKU #87202
Hex Cap Screws 18-8 SS - 5/16-18 x 4-1/4" PT
SKU #87202
1
$1.08 (1.08/ea)
25
$24.25 (0.97/ea)
100
$94.00 (0.94/ea)
1000
$840.00 (0.84/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 4-1/2" PT
SKU #87212
Hex Cap Screws 18-8 SS - 5/16-18 x 4-1/2" PT
SKU #87212
1
$1.15 (1.15/ea)
25
$25.75 (1.03/ea)
100
$98.00 (0.98/ea)
1000
$880.00 (0.88/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 4-3/4" PT
SKU #87222
Hex Cap Screws 18-8 SS - 5/16-18 x 4-3/4" PT
SKU #87222
1
$1.26 (1.26/ea)
25
$31.00 (1.24/ea)
100
$118.00 (1.18/ea)
1000
$1,170.00 (1.17/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 5" PT
SKU #87232
Hex Cap Screws 18-8 SS - 5/16-18 x 5" PT
SKU #87232
1
$1.23 (1.23/ea)
25
$27.50 (1.1/ea)
100
$106.00 (1.06/ea)
1000
$950.00 (0.95/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 5-1/2" PT
SKU #87242
Hex Cap Screws 18-8 SS - 5/16-18 x 5-1/2" PT
SKU #87242
1
$1.47 (1.47/ea)
25
$33.00 (1.32/ea)
100
$129.00 (1.29/ea)
1000
$1,150.00 (1.15/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 6" PT
SKU #87252
Hex Cap Screws 18-8 SS - 5/16-18 x 6" PT
SKU #87252
1
$1.51 (1.51/ea)
25
$33.75 (1.35/ea)
100
$130.00 (1.3/ea)
1000
$1,160.00 (1.16/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 6-1/2" PT
SKU #87262
Hex Cap Screws 18-8 SS - 5/16-18 x 6-1/2" PT
SKU #87262
1
$5.00 (5/ea)
25
$114.50 (4.58/ea)
100
$450.00 (4.5/ea)
1000
$4,450.00 (4.45/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 7" PT
SKU #87272
Hex Cap Screws 18-8 SS - 5/16-18 x 7" PT
SKU #87272
1
$6.81 (6.81/ea)
25
$137.25 (5.49/ea)
100
$522.00 (5.22/ea)
1000
$5,190.00 (5.19/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 8" PT
SKU #87282
Hex Cap Screws 18-8 SS - 5/16-18 x 8" PT
SKU #87282
1
$8.25 (8.25/ea)
25
$150.75 (6.03/ea)
100
$573.00 (5.73/ea)
1000
$5,700.00 (5.7/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 9" PT
SKU #87292
Hex Cap Screws 18-8 SS - 5/16-18 x 9" PT
SKU #87292
1
$20.39 (20.39/ea)
25
$489.25 (19.57/ea)
100
$1,871.00 (18.71/ea)
1000
$18,700.00 (18.7/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 10" PT
SKU #87302
Hex Cap Screws 18-8 SS - 5/16-18 x 10" PT
SKU #87302
1
$15.94 (15.94/ea)
25
$321.75 (12.87/ea)
100
$1,277.00 (12.77/ea)
1000
$12,160.00 (12.16/ea)
Subtotal: $0.00 /
Hex Cap Screws 18-8 SS - 5/16-18 x 12" PT
SKU #87312
Hex Cap Screws 18-8 SS - 5/16-18 x 12" PT
SKU #87312
1
$19.67 (19.67/ea)
25
$406.00 (16.24/ea)
100
$1,613.00 (16.13/ea)
1000
$15,360.00 (15.36/ea)
Subtotal: $0.00 /

Frequently Used With

1
NA
25
$2.00 (0.08/ea)
100
$6.00 (0.06/ea)
1000
$40.00 (0.04/ea)
Subtotal: $0.00 /
1
NA
25
$2.25 (0.09/ea)
100
$7.00 (0.07/ea)
1000
$60.00 (0.06/ea)
Subtotal: $0.00 /

Product Specifications
ASME
B18.2.1
Color
Silver
Corrosion Resistant
Yes
Diameter
5/16"
Drive Style
External Hex
Grade
18-8
Head Height
Basic 13/16", Max 0.211 - Min 0.195
Head Height Max
0.211
Head Style
Hex
Material
Stainless Steel
Product Type
Hex Cap Screws
Standards Met
ASME B18.2.1
System of Measurement (Unit)
Inch
Thread Direction
Right Hand
Thread Pitch (Count)
18 Per Inch
Thread Standard
UNC
Thread Type
Coarse
Tolerance (IFI)
Actual measurements may vary slightly +/- depending on production run within IFI Tolerances
Width Across Corners
0.577
Wrench Size
1/2"