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Hex Cap Screws, Stainless Steel 316, 5/16"-18 x 3/4, Full Thread

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
  • 316 Stainless Steel Hex Cap Screws are suitable for saltwater, marine and hash environment installations
  • Commonly used for:
    • Boats
    • Docks
    • Piers
    • Other harsh environments

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

**1/4"-20 Hex Cap Screws listed as PT, usually have a threaded portion of about 3/4".
However, this can vary slightly from manufacturer to manufacturer.

Product number: 640032
Print this page
Click on a size/sku in the table to view product-specific details and specifications.
FT = Full Thread (threaded the entire length)  ·  PT = Partial Thread (unthreaded shoulder below the head)

Specifications

  • Across Flats (Width): 1/2" (Max 0.500 - Min 0.489)
  • asme: B18.2.1
  • Color (Duplicate): Silver
  • Color: Silver
  • Condition: New
  • Corrosion Resistant: Yes
  • Diameter: 5/16"
  • Drive Style: External Hex
  • Head Type: Hex Head
  • Thread Direction: Right Hand
  • Thread Type: Coarse
  • Fit: 2A
  • FT = Full Thread: Yes
  • Grade: 316
  • Head Height: Basic 13/16", Max 0.211 - Min 0.195
  • Head Height Basic: 13/64"
  • Head Height Max: 0.211
  • Head Style: Hex
  • Length: 3/4
  • Marine Grade: Yes
  • Material (Duplicate): 316 Stainless Steel
  • Material: Stainless Steel
  • Overall Head Height: Basic 13/16", Max 0.211 - Min 0.195
  • Part Number: 787392572147
  • Pattern: Hex Cap Screws
  • Product Type: Hex Cap Screws
  • Size Type: Regular
  • Standards Met: ASME B18.2.1
  • System of Measurement: Inch
  • Thread Direction: Right Hand
  • Thread Pitch: 18 Per Inch
  • Thread Size: 5/16"-18
  • Thread Standard: UNC
  • Thread Type: Coarse
  • Tolerance (IFI): Actual measurements may vary slightly +/- depending on production run within IFI Tolerances
  • Weight: 1 lb
  • Width Across Corners: Max 0.577 - Min 0.577
  • Wrench Size: 1/2"

Frequently Used With

Hex Finish Nuts, Stainless Steel 316, 5/16"-18 (1/2" Flats x 17/64" Thick) Hex Finish Nuts, Stainless Steel 316, 5/16"-18 (1/2" Flats x 17/64" Thick)
Volume Pricing*
1
$0.16
($0.16/ea)
100
$9.00
($0.09/ea)
1000
$80.00
($0.08/ea)
$0.00
Fender Washers, Stainless Steel 316, (5/16" x 1-1/4") Fender Washers, Stainless Steel 316, (5/16" x 1-1/4")
Volume Pricing*
1
$0.66
($0.66/ea)
100
$54.00
($0.54/ea)
1000
$390.00
($0.39/ea)
$0.00
Flat Washers, Stainless Steel 316, 5/16" (0.343 ID x 3/4 OD x .050 THK) Flat Washers, Stainless Steel 316, 5/16" (0.343 ID x 3/4 OD x .050 THK)
Volume Pricing*
1
$0.09
($0.09/ea)
100
$7.00
($0.07/ea)
1000
$60.00
($0.06/ea)
$0.00
Lock Washers, Split Ring, Stainless Steel 316, 5/16" (0.314 ID x 0.583 OD x .078 THK) Lock Washers, Split Ring, Stainless Steel 316, 5/16" (0.314 ID x 0.583 OD x .078 THK)
Volume Pricing*
1
$0.12
($0.12/ea)
100
$7.00
($0.07/ea)
1000
$60.00
($0.06/ea)
$0.00
Nylon Lock Nuts, Stainless Steel 316, 5/16"-18 (502" Flats x .250" Thick) Nylon Lock Nuts, Stainless Steel 316, 5/16"-18 (502" Flats x .250" Thick)
Volume Pricing*
1
$0.30
($0.30/ea)
100
$26.00
($0.26/ea)
1000
$220.00
($0.22/ea)
$0.00
MRO Solution 2400, Marine Grade Anti-Seize Lubricant, 8 oz. MRO Solution 2400, Marine Grade Anti-Seize Lubricant, 8 oz.
Volume Pricing*
$20.03 ea.
$0.00
Select Size/SKU & Quantity
22 Available Sizes
SIZE/SKU Review Volume Pricing* Enter Any Qty
5/16"-18 x 1/2 FT
640012
1
$0.47 ($0.47/ea)
100
$26.00 ($0.26/ea)
1000
$230.00 ($0.23/ea)
$0.00
5/16"-18 x 5/8 FT
640022
1
$0.50 ($0.50/ea)
100
$29.00 ($0.29/ea)
1000
$250.00 ($0.25/ea)
$0.00
5/16"-18 x 3/4 FT
640032
1
$0.54 ($0.54/ea)
100
$34.00 ($0.34/ea)
1000
$300.00 ($0.30/ea)
$0.00
5/16"-18 x 7/8" FT
640042
1
$0.58 ($0.58/ea)
100
$41.00 ($0.41/ea)
1000
$360.00 ($0.36/ea)
$0.00
5/16"-18 x 1 FT
640052
1
$0.61 ($0.61/ea)
100
$42.00 ($0.42/ea)
1000
$370.00 ($0.37/ea)
$0.00
5/16"-18 x 1-1/4 FT
640072
1
$0.66 ($0.66/ea)
100
$47.00 ($0.47/ea)
1000
$410.00 ($0.41/ea)
$0.00
5/16"-18 x 1-3/8 PT
640082
1
$0.73 ($0.73/ea)
100
$51.00 ($0.51/ea)
1000
$450.00 ($0.45/ea)
$0.00
5/16"-18 x 1-1/2 PT
640092
1
$0.76 ($0.76/ea)
100
$52.00 ($0.52/ea)
1000
$460.00 ($0.46/ea)
$0.00
5/16"-18 x 1-3/4 PT
640102
1
$0.81 ($0.81/ea)
100
$57.00 ($0.57/ea)
1000
$510.00 ($0.51/ea)
$0.00
5/16"-18 x 2 PT
640112
1
$0.93 ($0.93/ea)
100
$68.00 ($0.68/ea)
1000
$600.00 ($0.60/ea)
$0.00
5/16"-18 x 2-1/4 PT
640122
1
$0.96 ($0.96/ea)
100
$71.00 ($0.71/ea)
1000
$620.00 ($0.62/ea)
$0.00
5/16"-18 x 2-1/2 PT
640132
1
$1.03 ($1.03/ea)
100
$75.00 ($0.75/ea)
1000
$660.00 ($0.66/ea)
$0.00
5/16"-18 x 2-3/4 PT
640142
1
$1.11 ($1.11/ea)
100
$83.00 ($0.83/ea)
1000
$730.00 ($0.73/ea)
$0.00
5/16"-18 x 3 PT
640152
1
$1.18 ($1.18/ea)
100
$88.00 ($0.88/ea)
1000
$780.00 ($0.78/ea)
$0.00
5/16"-18 x 3-1/4 PT
640162
1
$1.42 ($1.42/ea)
100
$108.00 ($1.08/ea)
1000
$950.00 ($0.95/ea)
$0.00
5/16"-18 x 3-1/2 PT
640172
1
$1.49 ($1.49/ea)
100
$112.00 ($1.12/ea)
1000
$980.00 ($0.98/ea)
$0.00
5/16"-18 x 3-3/4 PT
640182
1
$2.44 ($2.44/ea)
100
$185.00 ($1.85/ea)
1000
$1,630.00 ($1.63/ea)
$0.00
5/16"-18 x 4 PT
640192
1
$1.60 ($1.60/ea)
100
$130.00 ($1.30/ea)
1000
$1,080.00 ($1.08/ea)
$0.00
5/16"-18 x 4-1/2 PT
640212
1
$2.11 ($2.11/ea)
100
$160.00 ($1.60/ea)
1000
$1,410.00 ($1.41/ea)
$0.00
5/16"-18 x 5 PT
640222
1
$2.17 ($2.17/ea)
100
$166.00 ($1.66/ea)
1000
$1,460.00 ($1.46/ea)
$0.00
5/16"-18 x 5-1/2 PT
640232
1
$2.57 ($2.57/ea)
100
$185.00 ($1.85/ea)
1000
$1,630.00 ($1.63/ea)
$0.00
5/16"-18 x 6 PT
640242
1
$2.63 ($2.63/ea)
100
$194.00 ($1.94/ea)
1000
$1,710.00 ($1.71/ea)
$0.00

*Volume pricing available on select products. Products without quantity breaks are priced per unit.

Page Total: $0.00

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