5/16-18 Socket Head Screws 18-8 Stainless Steel

5/16"-18 Stainless Steel Socket Cap Screws

Screw Diameter - Thread Pitch: 5/16"-18


5/16"-18 Stainless steel Knurled Head socket cap screws are bolts or machine screws with a Hex or Allen drive style.

  • Commonly referred to as allen bolts, socket head cap screws, or socket head screws
  • Driven manually, or with a Hex Allen Bit or Key
  • Cylindrical head
  • 18-8 Stainless Steel offer the Fastener Industry standard for corrosion and rust resistance
  • Recommended for use in exterior applications, or those that are exposed to fresh water moisture
The term socket head cap screw typically refers to a type of threaded fastener whose head diameter is nominally 1.5 times or more that of the screw shank (major) diameter.


Sizes Listed As:
Diameter - Thread Pitch x Length from Underside of Head
FT = Full Thread
PT = Partial Thread

Select Products Below See Product Specifications

NA = "Not Sold In Single Quantity"

Size
Select Package Quantity
SubTotal
Socket Cap Screws 304 SS - 5/16-18 x 3/8 (FT)
SKU #3000002
Socket Cap Screws 304 SS - 5/16-18 x 3/8 (FT)
SKU #3000002
1
NA
25
$14.25 (0.57/ea)
100
$53.00 (0.53/ea)
1000
$510.00 (0.51/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 7/16 (FT)
SKU #300002
Socket Cap Screws 304 SS - 5/16-18 x 7/16 (FT)
SKU #300002
1
$3.34 (3.34/ea)
25
$80.00 (3.2/ea)
100
$308.00 (3.08/ea)
1000
$3,050.00 (3.05/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 1/2 (FT)
SKU #30002
Socket Cap Screws 304 SS - 5/16-18 x 1/2 (FT)
SKU #30002
1
NA
25
$7.00 (0.28/ea)
100
$25.00 (0.25/ea)
1000
$220.00 (0.22/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 5/8 (FT)
SKU #30012
Socket Cap Screws 304 SS - 5/16-18 x 5/8 (FT)
SKU #30012
1
NA
25
$7.50 (0.3/ea)
100
$25.00 (0.25/ea)
1000
$220.00 (0.22/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 3/4 (FT)
SKU #30022
Socket Cap Screws 304 SS - 5/16-18 x 3/4 (FT)
SKU #30022
1
NA
25
$7.75 (0.31/ea)
100
$25.00 (0.25/ea)
1000
$220.00 (0.22/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 7/8 (FT)
SKU #30032
Socket Cap Screws 304 SS - 5/16-18 x 7/8 (FT)
SKU #30032
1
NA
25
$8.75 (0.35/ea)
100
$28.00 (0.28/ea)
1000
$250.00 (0.25/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 1 (FT)
SKU #30042
Socket Cap Screws 304 SS - 5/16-18 x 1 (FT)
SKU #30042
1
NA
25
$8.75 (0.35/ea)
100
$29.00 (0.29/ea)
1000
$250.00 (0.25/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 1-1/8 (FT)
SKU #300502
Socket Cap Screws 304 SS - 5/16-18 x 1-1/8 (FT)
SKU #300502
1
NA
25
$12.50 (0.5/ea)
100
$48.00 (0.48/ea)
1000
$450.00 (0.45/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 1-1/4 (FT)
SKU #30052
Socket Cap Screws 304 SS - 5/16-18 x 1-1/4 (FT)
SKU #30052
1
NA
25
$11.00 (0.44/ea)
100
$33.00 (0.33/ea)
1000
$290.00 (0.29/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 1-3/8 (FT)
SKU #300602
Socket Cap Screws 304 SS - 5/16-18 x 1-3/8 (FT)
SKU #300602
1
NA
25
$15.25 (0.61/ea)
100
$59.00 (0.59/ea)
1000
$580.00 (0.58/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 1-1/2 (FT)
SKU #30062
Socket Cap Screws 304 SS - 5/16-18 x 1-1/2 (FT)
SKU #30062
1
NA
25
$11.25 (0.45/ea)
100
$36.00 (0.36/ea)
1000
$310.00 (0.31/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 1-3/4 (PT)
SKU #30072
Socket Cap Screws 304 SS - 5/16-18 x 1-3/4 (PT)
SKU #30072
1
$0.62 (0.62/ea)
25
$13.75 (0.55/ea)
100
$45.00 (0.45/ea)
1000
$390.00 (0.39/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 2 (PT)
SKU #30082
Socket Cap Screws 304 SS - 5/16-18 x 2 (PT)
SKU #30082
1
$0.71 (0.71/ea)
25
$17.00 (0.68/ea)
100
$53.00 (0.53/ea)
1000
$460.00 (0.46/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 2-1/4 (PT)
SKU #300902
Socket Cap Screws 304 SS - 5/16-18 x 2-1/4 (PT)
SKU #300902
1
$0.88 (0.88/ea)
25
$21.50 (0.86/ea)
100
$83.00 (0.83/ea)
1000
$810.00 (0.81/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 2-1/2 (PT)
SKU #30092
Socket Cap Screws 304 SS - 5/16-18 x 2-1/2 (PT)
SKU #30092
1
$0.91 (0.91/ea)
25
$22.00 (0.88/ea)
100
$66.00 (0.66/ea)
1000
$580.00 (0.58/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 2-3/4 (PT)
SKU #301002
Socket Cap Screws 304 SS - 5/16-18 x 2-3/4 (PT)
SKU #301002
1
$1.06 (1.06/ea)
25
$25.75 (1.03/ea)
100
$99.00 (0.99/ea)
1000
$970.00 (0.97/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 3 (PT)
SKU #30102
Socket Cap Screws 304 SS - 5/16-18 x 3 (PT)
SKU #30102
1
$1.44 (1.44/ea)
25
$31.25 (1.25/ea)
100
$102.00 (1.02/ea)
1000
$880.00 (0.88/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 3-1/4 (PT)
SKU #301102
Socket Cap Screws 304 SS - 5/16-18 x 3-1/4 (PT)
SKU #301102
1
$1.52 (1.52/ea)
25
$36.75 (1.47/ea)
100
$141.00 (1.41/ea)
1000
$1,390.00 (1.39/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 3-1/2 (PT)
SKU #30112
Socket Cap Screws 304 SS - 5/16-18 x 3-1/2 (PT)
SKU #30112
1
$2.27 (2.27/ea)
25
$50.00 (2/ea)
100
$178.00 (1.78/ea)
1000
$1,520.00 (1.52/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 4 (PT)
SKU #30122
Socket Cap Screws 304 SS - 5/16-18 x 4 (PT)
SKU #30122
1
$2.59 (2.59/ea)
25
$56.25 (2.25/ea)
100
$196.00 (1.96/ea)
1000
$1,680.00 (1.68/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 4-1/2 (PT)
SKU #30132
Socket Cap Screws 304 SS - 5/16-18 x 4-1/2 (PT)
SKU #30132
1
$2.83 (2.83/ea)
25
$62.50 (2.5/ea)
100
$214.00 (2.14/ea)
1000
$1,840.00 (1.84/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 5 (PT)
SKU #30142
Socket Cap Screws 304 SS - 5/16-18 x 5 (PT)
SKU #30142
1
$3.65 (3.65/ea)
25
$87.50 (3.5/ea)
100
$278.00 (2.78/ea)
1000
$2,380.00 (2.38/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 6 (PT)
SKU #30152
Socket Cap Screws 304 SS - 5/16-18 x 6 (PT)
SKU #30152
1
$4.11 (4.11/ea)
25
$93.75 (3.75/ea)
100
$308.00 (3.08/ea)
1000
$2,380.00 (2.38/ea)
Subtotal: $0.00 /
Socket Cap Screws 304 SS - 5/16-18 x 7 (PT)
SKU #30162
Socket Cap Screws 304 SS - 5/16-18 x 7 (PT)
SKU #30162
1
$9.13 (9.13/ea)
25
$212.50 (8.5/ea)
100
$736.00 (7.36/ea)
1000
$6,290.00 (6.29/ea)
Subtotal: $0.00 /

Frequently Used With

1
$3.15 (3.15/ea)
10
$29.80 (2.98/ea)
25
$72.75 (2.91/ea)
50
$129.50 (2.59/ea)
Subtotal: $0.00 /
1
$1.94 (1.94/ea)
25
$45.25 (1.81/ea)
100
$167.00 (1.67/ea)
1000
$1,530.00 (1.53/ea)
Subtotal: $0.00 /
1
$0.99 (0.99/ea)
25
$23.25 (0.93/ea)
100
$85.00 (0.85/ea)
1000
$780.00 (0.78/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
Chamfer on Radius
Max 0.008
Color
Silver
Corrosion Resistant
Yes
Diameter
5/16"
Drive Style
Internal Hex (Allen)
Grade
18-8
Head Diameter
Max 0.469 - Min 0.457
Head Height Max
0.312
Head Side Height
Min 0.281
Head Style
Socket Cap
Hex Drive
1/4"
Material
Stainless Steel
Overall Head Height
Max 0.312 - Min 0.306
Product Type
Socket Cap Screws
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