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

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
  • Called hex cap bolts or hex cap screws
  • 18-8 Stainless steel hex cap screws offer protection from weather and corrosive environments
  • Rust resistant in fresh water environments
  • For salt water environments use the 316 stainless steel version

Diameter x Thread Pitch x Length from Under Head
FT: Fully Threaded
PT: Partially Threaded

Select Products Below
Product Specifications
Across Flats (Width)
1/2", Max 0.50 - Min 0.489
ASME
B18.2.1
Body Diameter
5/16" (Max 0.3113 - Min 0.3026)
Color
Silver
Corrosion Resistant
Yes
Diameter
5/16"
Drive Style
External Hex
Head Height
Basic 13/16", Max 0.211 - Min 0.195
Head Height Max
0.211
Head Style
Hex
Material
Stainless Steel 18-8
Product Type
Hex Cap Screws
Standards Met
ASME B18.2.1
Thread Direction
Right Hand
Thread Pitch (Count)
18
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"
Select Products Below
Qty
Size
Select Package Quantity
SubTotal
5/16"-18 x 3/8" FT
SKU #87002
5/16"-18 x 3/8" FT
SKU #87002
1
$0.40 (0.40/ea)
25
$9.00 (0.36/ea)
100
$33.00 (0.33/ea)
1000
$300.00 (0.30/ea)
 
5/16"-18 x 1/2" FT
SKU #87012
5/16"-18 x 1/2" FT
SKU #87012
1
$0.15 (0.15/ea)
25
$2.75 (0.11/ea)
100
$10.00 (0.10/ea)
1000
$90.00 (0.09/ea)
 
5/16"-18 x 5/8" FT
SKU #87022
5/16"-18 x 5/8" FT
SKU #87022
1
$0.15 (0.15/ea)
25
$3.00 (0.12/ea)
100
$11.00 (0.11/ea)
1000
$100.00 (0.10/ea)
 
5/16"-18 x 3/4" FT
SKU #87032
5/16"-18 x 3/4" FT
SKU #87032
1
$0.15 (0.15/ea)
25
$3.25 (0.13/ea)
100
$11.00 (0.11/ea)
1000
$100.00 (0.10/ea)
 
5/16"-18 x 7/8" FT
SKU #87042
5/16"-18 x 7/8" FT
SKU #87042
1
$0.15 (0.15/ea)
25
$3.50 (0.14/ea)
100
$13.00 (0.13/ea)
1000
$110.00 (0.11/ea)
 
5/16"-18 x 1" FT
SKU #87052
5/16"-18 x 1" FT
SKU #87052
1
$0.16 (0.16/ea)
25
$3.50 (0.14/ea)
100
$13.00 (0.13/ea)
1000
$120.00 (0.12/ea)
 
5/16"-18 x 1-1/8" FT
SKU #87062
5/16"-18 x 1-1/8" FT
SKU #87062
1
$0.18 (0.18/ea)
25
$4.25 (0.17/ea)
100
$15.00 (0.15/ea)
1000
$140.00 (0.14/ea)
 
5/16"-18 x 1-1/4" FT
SKU #87072
5/16"-18 x 1-1/4" FT
SKU #87072
1
$0.19 (0.19/ea)
25
$4.25 (0.17/ea)
100
$15.00 (0.15/ea)
1000
$140.00 (0.14/ea)
 
5/16"-18 x 1-3/8" PT
SKU #87082
5/16"-18 x 1-3/8" PT
SKU #87082
1
$0.21 (0.21/ea)
25
$5.00 (0.20/ea)
100
$18.00 (0.18/ea)
1000
$160.00 (0.16/ea)
 
5/16"-18 x 1-1/2" PT
SKU #87092
5/16"-18 x 1-1/2" PT
SKU #87092
1
$0.21 (0.21/ea)
25
$5.00 (0.20/ea)
100
$18.00 (0.18/ea)
1000
$160.00 (0.16/ea)
 
5/16"-18 x 1-3/4" PT
SKU #87102
5/16"-18 x 1-3/4" PT
SKU #87102
1
$0.25 (0.25/ea)
25
$5.75 (0.23/ea)
100
$21.00 (0.21/ea)
1000
$190.00 (0.19/ea)
 
5/16"-18 x 2" PT
SKU #87112
5/16"-18 x 2" PT
SKU #87112
1
$0.27 (0.27/ea)
25
$6.25 (0.25/ea)
100
$23.00 (0.23/ea)
1000
$210.00 (0.21/ea)
 
5/16"-18 x 2-1/4" PT
SKU #87122
5/16"-18 x 2-1/4" PT
SKU #87122
1
$0.31 (0.31/ea)
25
$7.25 (0.29/ea)
100
$26.00 (0.26/ea)
1000
$230.00 (0.23/ea)
 
5/16"-18 x 2-1/2" PT
SKU #87132
5/16"-18 x 2-1/2" PT
SKU #87132
1
$0.33 (0.33/ea)
25
$7.50 (0.30/ea)
100
$28.00 (0.28/ea)
1000
$250.00 (0.25/ea)
 
5/16"-18 x 2-3/4" PT
SKU #87142
5/16"-18 x 2-3/4" PT
SKU #87142
1
$0.38 (0.38/ea)
25
$8.75 (0.35/ea)
100
$32.00 (0.32/ea)
1000
$290.00 (0.29/ea)
 
5/16"-18 x 3" PT
SKU #87152
5/16"-18 x 3" PT
SKU #87152
1
$0.39 (0.39/ea)
25
$9.00 (0.36/ea)
100
$33.00 (0.33/ea)
1000
$290.00 (0.29/ea)
 
5/16"-18 x 3-1/4" PT
SKU #87162
5/16"-18 x 3-1/4" PT
SKU #87162
1
$0.45 (0.45/ea)
25
$10.25 (0.41/ea)
100
$37.00 (0.37/ea)
1000
$330.00 (0.33/ea)
 
5/16"-18 x 3-1/2" PT
SKU #87172
5/16"-18 x 3-1/2" PT
SKU #87172
1
$0.46 (0.46/ea)
25
$10.75 (0.43/ea)
100
$39.00 (0.39/ea)
1000
$350.00 (0.35/ea)
 
5/16"-18 x 3-3/4" PT
SKU #87182
5/16"-18 x 3-3/4" PT
SKU #87182
1
$0.53 (0.53/ea)
25
$12.25 (0.49/ea)
100
$45.00 (0.45/ea)
1000
$400.00 (0.40/ea)
 
5/16"-18 x 4" PT
SKU #87192
5/16"-18 x 4" PT
SKU #87192
1
$0.54 (0.54/ea)
25
$12.25 (0.49/ea)
100
$45.00 (0.45/ea)
1000
$400.00 (0.40/ea)
 
5/16"-18 x 4-1/4" PT
SKU #87202
5/16"-18 x 4-1/4" PT
SKU #87202
1
$0.73 (0.73/ea)
25
$16.75 (0.67/ea)
100
$61.00 (0.61/ea)
1000
$540.00 (0.54/ea)
 
5/16"-18 x 4-1/2" PT
SKU #87212
5/16"-18 x 4-1/2" PT
SKU #87212
1
$0.65 (0.65/ea)
25
$15.00 (0.60/ea)
100
$54.00 (0.54/ea)
1000
$490.00 (0.49/ea)
 
5/16"-18 x 4-3/4" PT
SKU #87222
5/16"-18 x 4-3/4" PT
SKU #87222
1
$0.83 (0.83/ea)
25
$19.00 (0.76/ea)
100
$69.00 (0.69/ea)
1000
$620.00 (0.62/ea)
 
5/16"-18 x 5" PT
SKU #87232
5/16"-18 x 5" PT
SKU #87232
1
$0.72 (0.72/ea)
25
$16.50 (0.66/ea)
100
$60.00 (0.60/ea)
1000
$540.00 (0.54/ea)
 
5/16"-18 x 5-1/2" PT
SKU #87242
5/16"-18 x 5-1/2" PT
SKU #87242
1
$0.79 (0.79/ea)
25
$18.00 (0.72/ea)
100
$66.00 (0.66/ea)
1000
$590.00 (0.59/ea)
 
5/16"-18 x 6" PT
SKU #87252
5/16"-18 x 6" PT
SKU #87252
1
$0.86 (0.86/ea)
25
$19.50 (0.78/ea)
100
$71.00 (0.71/ea)
1000
$640.00 (0.64/ea)
 
5/16"-18 x 6-1/2" PT
SKU #87262
5/16"-18 x 6-1/2" PT
SKU #87262
1
$6.93 (6.93/ea)
25
$158.75 (6.35/ea)
100
$578.00 (5.78/ea)
1000
$5,200.00 (5.20/ea)
 
5/16"-18 x 7" PT
SKU #87272
5/16"-18 x 7" PT
SKU #87272
1
$7.59 (7.59/ea)
25
$174.00 (6.96/ea)
100
$633.00 (6.33/ea)
1000
$5,690.00 (5.69/ea)
 
5/16"-18 x 8" PT
SKU #87282
5/16"-18 x 8" PT
SKU #87282
1
$9.24 (9.24/ea)
25
$211.75 (8.47/ea)
100
$770.00 (7.70/ea)
1000
$6,930.00 (6.93/ea)
 
5/16"-18 x 9" PT
SKU #87292
5/16"-18 x 9" PT
SKU #87292
1
$13.20 (13.20/ea)
25
$302.50 (12.10/ea)
100
$1,100.00 (11.00/ea)
1000
$9,900.00 (9.90/ea)
 
5/16"-18 x 10" PT
SKU #87302
5/16"-18 x 10" PT
SKU #87302
1
$17.82 (17.82/ea)
25
$408.50 (16.34/ea)
100
$1,485.00 (14.85/ea)
1000
$13,370.00 (13.37/ea)
 
5/16"-18 x 12" PT
SKU #87312
5/16"-18 x 12" PT
SKU #87312
1
$22.94 (22.94/ea)
25
$525.50 (21.02/ea)
100
$1,911.00 (19.11/ea)
1000
$17,200.00 (17.20/ea)