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Carriage Bolts, Stainless Steel 18-8, 5/16"-18 x 5/8", Full Thread

Diameter - Thread Pitch: 5/16-18
  • Square section grips into the part being fixed (typically wood)
  • Carriage bolts are threaded all the way down to the square section beneath the head
  • Prevents the bolt from turning when the nut is tightened
  • 18-8 Stainless steel is corrosion and rust resistant
  • 18-8 Stainless steel is considered the fastener industry standard

5/16"-18 Carriage bolts have a domed or countersunk head, and the shank is topped by a short square section under the head.

All Carriage Bolts over 6" in length are Partially Threaded

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

Play video
How to Properly Install & Remove Carriage Bolts
Bolt Head Markings: What do they mean?
Product number: 77002
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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

  • Color: Silver
  • Condition: New
  • Corner Radius on Square: 0.031"
  • Corrosion Resistant: Yes
  • Diameter: 5/16"
  • Head Type: Dome Head
  • Thread Direction: Right Hand
  • Thread Type: Coarse
  • Filet Radius: 0.031
  • Fit: 2A
  • FT = Full Thread: Yes
  • Grade: 18-8
  • Head Height: Max 0.176 - Min 0.156
  • Head Height Max: 0.176
  • Head Diameter: Max 0.719 - Min 0.688
  • Head Style: Dome
  • Length: 5/8"
  • Material: Stainless Steel
  • Overall Head Height: Max 0.176 - Min 0.156
  • Part Number: 717029202802
  • Product Type: Carriage Bolt
  • Size Type: Regular
  • Square Neck Depth: Max 0.187 - Min 0.156
  • Square Neck Width: Max 0.324 - Min 0.307
  • 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

Frequently Used With

Flat Washers, Stainless Steel 304, 5/16" (.343 ID x 3/4 OD x .050 Thick) Flat Washers, Stainless Steel 304, 5/16" (.343 ID x 3/4 OD x .050 Thick)
SKU: 1000-105152
Volume Pricing*
1
$0.09
($0.09/ea)
100
$5.00
($0.05/ea)
1000
$40.00
($0.04/ea)
$0.00
Hex Finish Nuts, Stainless Steel 304, 5/16"-18 (1/2" Flats x 17/64" Thick) Hex Finish Nuts, Stainless Steel 304, 5/16"-18 (1/2" Flats x 17/64" Thick)
SKU: 123022
Volume Pricing*
1
$0.11
($0.11/ea)
100
$8.00
($0.08/ea)
1000
$60.00
($0.06/ea)
$0.00
MRO Solution 2400, Marine Grade Anti-Seize Lubricant, 8 oz. MRO Solution 2400, Marine Grade Anti-Seize Lubricant, 8 oz.
SKU: 1050-106
Volume Pricing*
$20.03 ea.
$0.00
Lock Washers, Split Ring, Stainless Steel 304, 5/16" (.314 ID x .583 OD x .078 Thick) Lock Washers, Split Ring, Stainless Steel 304, 5/16" (.314 ID x .583 OD x .078 Thick)
SKU: 108112
Volume Pricing*
1
$0.11
($0.11/ea)
100
$6.00
($0.06/ea)
1000
$50.00
($0.05/ea)
$0.00
Select Size/SKU & Quantity
24 Available Sizes
SIZE/SKU Review Volume Pricing* Enter Any Qty
5/16"-18 x 5/8" FT
77002
1
$0.35 ($0.35/ea)
100
$30.00 ($0.30/ea)
1000
$290.00 ($0.29/ea)
$0.00
5/16"-18 x 3/4" FT
77012
1
$0.31 ($0.31/ea)
100
$23.00 ($0.23/ea)
1000
$210.00 ($0.21/ea)
$0.00
5/16"-18 x 1" FT
77022
1
$0.34 ($0.34/ea)
100
$25.00 ($0.25/ea)
1000
$220.00 ($0.22/ea)
$0.00
5/16"-18 x 1-1/4" FT
77032
1
$0.40 ($0.40/ea)
100
$29.00 ($0.29/ea)
1000
$260.00 ($0.26/ea)
$0.00
5/16"-18 x 1-1/2" FT
77042
1
$0.42 ($0.42/ea)
100
$30.00 ($0.30/ea)
1000
$270.00 ($0.27/ea)
$0.00
5/16"-18 x 1-3/4" FT
77052
1
$0.46 ($0.46/ea)
100
$33.00 ($0.33/ea)
1000
$300.00 ($0.30/ea)
$0.00
5/16"-18 x 2" FT
77062
1
$0.50 ($0.50/ea)
100
$36.00 ($0.36/ea)
1000
$320.00 ($0.32/ea)
$0.00
5/16"-18 x 2-1/4" FT
77072
1
$0.48 ($0.48/ea)
100
$44.00 ($0.44/ea)
1000
$400.00 ($0.40/ea)
$0.00
5/16"-18 x 2-1/2" FT
77082
1
$0.60 ($0.60/ea)
100
$44.00 ($0.44/ea)
1000
$390.00 ($0.39/ea)
$0.00
5/16"-18 x 2-3/4" FT
77092
1
$0.64 ($0.64/ea)
100
$50.00 ($0.50/ea)
1000
$450.00 ($0.45/ea)
$0.00
5/16"-18 x 3" FT
77102
1
$0.66 ($0.66/ea)
100
$48.00 ($0.48/ea)
1000
$430.00 ($0.43/ea)
$0.00
5/16"-18 x 3-1/4" FT
77112
1
$0.70 ($0.70/ea)
100
$55.00 ($0.55/ea)
1000
$500.00 ($0.50/ea)
$0.00
5/16"-18 x 3-1/2" FT
77122
1
$0.80 ($0.80/ea)
100
$58.00 ($0.58/ea)
1000
$510.00 ($0.51/ea)
$0.00
5/16"-18 x 3-3/4" FT
77132
1
$0.88 ($0.88/ea)
100
$83.00 ($0.83/ea)
1000
$810.00 ($0.81/ea)
$0.00
5/16"-18 x 4" FT
77142
1
$1.00 ($1.00/ea)
100
$70.00 ($0.70/ea)
1000
$650.00 ($0.65/ea)
$0.00
5/16"-18 x 4-1/2" FT
77152
1
$1.10 ($1.10/ea)
100
$79.00 ($0.79/ea)
1000
$700.00 ($0.70/ea)
$0.00
5/16"-18 x 5" FT
77162
1
$1.27 ($1.27/ea)
100
$91.00 ($0.91/ea)
1000
$820.00 ($0.82/ea)
$0.00
5/16"-18 x 5-1/2" FT
77172
1
$1.35 ($1.35/ea)
100
$97.00 ($0.97/ea)
1000
$870.00 ($0.87/ea)
$0.00
5/16"-18 x 6" FT
77182
1
$1.78 ($1.78/ea)
100
$127.00 ($1.27/ea)
1000
$1,150.00 ($1.15/ea)
$0.00
5/16"-18 x 6-1/2" PT
77192
1
$7.69 ($7.69/ea)
100
$549.00 ($5.49/ea)
1000
$4,940.00 ($4.94/ea)
$0.00
5/16"-18 x 7" PT
77202
1
$5.05 ($5.05/ea)
100
$360.00 ($3.60/ea)
1000
$3,250.00 ($3.25/ea)
$0.00
5/16"-18 x 8" PT
77212
1
$6.32 ($6.32/ea)
100
$451.00 ($4.51/ea)
1000
$4,070.00 ($4.07/ea)
$0.00
5/16"-18 x 9" PT
77222
1
$13.20 ($13.20/ea)
100
$943.00 ($9.43/ea)
1000
$8,490.00 ($8.49/ea)
$0.00
5/16"-18 x 10" PT
77232
1
$13.72 ($13.72/ea)
100
$981.00 ($9.81/ea)
1000
$8,820.00 ($8.82/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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