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Socket Cap Screws, Stainless Steel 18-8, 5/16"-18 x 4, Partial Thread

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

Product number: 30122
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

  • Chamfer on Radius: Max 0.008
  • Color (Duplicate): Silver
  • Color: Silver
  • Condition: New
  • Corrosion Resistant: Yes
  • Diameter: 5/16"
  • Drive Style: Internal Hex (Allen)
  • Head Type: Socket Head
  • Thread Direction: Right Hand
  • Thread Type: Coarse
  • Fit: 3A
  • FT = Full Thread: No
  • Grade: 18-8
  • Head Height: Max 0.312 - Min 0.306
  • Head Height Max: 0.312
  • Head Diameter: Max 0.469 - Min 0.457
  • Head Side Height: Min 0.281
  • Head Style: Socket Cap
  • Hex Drive: 1/4"
  • Length: 4
  • Material (Duplicate): 316 Stainless Steel
  • Material: Stainless Steel
  • Overall Head Height: Max 0.312 - Min 0.306
  • Part Number: 618930298352
  • Pattern: Hex Cap Screws
  • Product Type: Socket Cap Screws
  • Size System: US
  • Size Type: Regular
  • 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)
Volume Pricing*
1
$0.09
($0.09/ea)
100
$5.00
($0.05/ea)
1000
$40.00
($0.04/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)
Volume Pricing*
1
$0.11
($0.11/ea)
100
$6.00
($0.06/ea)
1000
$50.00
($0.05/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)
Volume Pricing*
1
$0.11
($0.11/ea)
100
$8.00
($0.08/ea)
1000
$60.00
($0.06/ea)
$0.00
Nylon Lock Nuts, Stainless Steel 304, 5/16-18 (.502 Flats x .359 Height) Nylon Lock Nuts, Stainless Steel 304, 5/16-18 (.502 Flats x .359 Height)
Volume Pricing*
1
$0.22
($0.22/ea)
100
$16.00
($0.16/ea)
1000
$140.00
($0.14/ea)
$0.00
Hex Socket Head Allen Power Bits, 1/4, Length 2" Hex Socket Head Allen Power Bits, 1/4, Length 2"
Volume Pricing*
1
$3.15
($3.15/ea)
10
$29.80
($2.98/ea)
50
$129.50
($2.59/ea)
$0.00
Hex Allen Key, Short Arm, Black Alloy Steel, 1/4" Hex Allen Key, Short Arm, Black Alloy Steel, 1/4"
Volume Pricing*
1
$1.16
($1.16/ea)
100
$87.00
($0.87/ea)
1000
$660.00
($0.66/ea)
$0.00
Select Size/SKU & Quantity
24 Available Sizes
SIZE/SKU Review Volume Pricing* Enter Any Qty
5/16"-18 x 3/8" FT
3000002
1
$0.59 ($0.59/ea)
100
$53.00 ($0.53/ea)
1000
$510.00 ($0.51/ea)
$0.00
5/16"-18 x 7/16" FT
300002
1
$0.32 ($0.32/ea)
100
$26.00 ($0.26/ea)
1000
$240.00 ($0.24/ea)
$0.00
5/16"-18 x 1/2" FT
30002
1
$0.32 ($0.32/ea)
100
$25.00 ($0.25/ea)
1000
$220.00 ($0.22/ea)
$0.00
5/16"-18 x 5/8" FT
30012
1
$0.32 ($0.32/ea)
100
$25.00 ($0.25/ea)
1000
$220.00 ($0.22/ea)
$0.00
5/16"-18 x 3/4" FT
30022
1
$0.33 ($0.33/ea)
100
$25.00 ($0.25/ea)
1000
$220.00 ($0.22/ea)
$0.00
5/16"-18 x 7/8" FT
30032
1
$0.38 ($0.38/ea)
100
$28.00 ($0.28/ea)
1000
$250.00 ($0.25/ea)
$0.00
5/16"-18 x 1" FT
30042
1
$0.40 ($0.40/ea)
100
$29.00 ($0.29/ea)
1000
$250.00 ($0.25/ea)
$0.00
5/16"-18 x 1-1/8" FT
300502
1
$0.45 ($0.45/ea)
100
$32.00 ($0.32/ea)
1000
$300.00 ($0.30/ea)
$0.00
5/16"-18 x 1-1/4" FT
30052
1
$0.45 ($0.45/ea)
100
$32.00 ($0.32/ea)
1000
$290.00 ($0.29/ea)
$0.00
5/16"-18 x 1-3/8" FT
300602
1
$0.45 ($0.45/ea)
100
$32.00 ($0.32/ea)
1000
$300.00 ($0.30/ea)
$0.00
5/16"-18 x 1-1/2" FT
30062
1
$0.50 ($0.50/ea)
100
$36.00 ($0.36/ea)
1000
$310.00 ($0.31/ea)
$0.00
5/16"-18 x 1-3/4" PT
30072
1
$0.62 ($0.62/ea)
100
$45.00 ($0.45/ea)
1000
$390.00 ($0.39/ea)
$0.00
5/16"-18 x 2" PT
30082
1
$0.71 ($0.71/ea)
100
$53.00 ($0.53/ea)
1000
$460.00 ($0.46/ea)
$0.00
5/16"-18 x 2-1/4" PT
300902
1
$0.71 ($0.71/ea)
100
$54.00 ($0.54/ea)
1000
$500.00 ($0.50/ea)
$0.00
5/16"-18 x 2-1/2" PT
30092
1
$0.91 ($0.91/ea)
100
$66.00 ($0.66/ea)
1000
$580.00 ($0.58/ea)
$0.00
5/16"-18 x 2-3/4" PT
301002
1
$0.91 ($0.91/ea)
100
$85.00 ($0.85/ea)
1000
$800.00 ($0.80/ea)
$0.00
5/16"-18 x 3" PT
30102
1
$1.44 ($1.44/ea)
100
$102.00 ($1.02/ea)
1000
$880.00 ($0.88/ea)
$0.00
5/16"-18 x 3-1/4" PT
301102
1
$2.27 ($2.27/ea)
100
$190.00 ($1.90/ea)
1000
$1,800.00 ($1.80/ea)
$0.00
5/16"-18 x 3-1/2" PT
30112
1
$2.27 ($2.27/ea)
100
$178.00 ($1.78/ea)
1000
$1,520.00 ($1.52/ea)
$0.00
5/16"-18 x 4" PT
30122
1
$2.59 ($2.59/ea)
100
$196.00 ($1.96/ea)
1000
$1,680.00 ($1.68/ea)
$0.00
5/16"-18 x 4-1/2" PT
30132
1
$2.83 ($2.83/ea)
100
$214.00 ($2.14/ea)
1000
$1,840.00 ($1.84/ea)
$0.00
5/16"-18 x 5" PT
30142
1
$3.65 ($3.65/ea)
100
$278.00 ($2.78/ea)
1000
$2,380.00 ($2.38/ea)
$0.00
5/16"-18 x 6" PT
30152
1
$4.11 ($4.11/ea)
100
$308.00 ($3.08/ea)
1000
$2,380.00 ($2.38/ea)
$0.00
5/16"-18 x 7" PT
30162
1
$9.13 ($9.13/ea)
100
$736.00 ($7.36/ea)
1000
$6,290.00 ($6.29/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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