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5/16-18 Hex Head Cap Screws 18-8 / 304 Grade Stainless Steel

  • Stainless Steel Hex Bolts Have a Hexagonal Head Used With a Wrench or a Socket.
  • Hex Head Cap Bolts are a Primary Fastener Type For Many Thru-Bolting Applications.
  • As a General Hex Cap Screw Rule: Thread Length is: 2X The Diameter Plus 1/2".
  • For Fully Threaded Hex Bolts Please View Our FULL THREAD Tap Bolt Category.
  • Made of 18-8 / 304 Grade Stainless Steel Which is an Austenitic Grade of Stainless Steel.
  • 5/16"-18 Right Hand, Coarse Thread, UNC
  • Please View Matching Nuts & Washers Below.  
  • CONTACT OUR SALES DEPARTMENT FOR BULK AND WHOLESALE PRICING.


Item # Image Description Price
BS5/16-18X.50BAG25
5/16-18 x 1/2
5/16-18 x 1/2" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$4.25

BS5/16-18X.63BAG25
5/16-18 x 5/8
5/16-18 x 5/8" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$4.50

BS5/16-18X.75BAG25
5/16-18 x 3/4
5/16-18 x 3/4" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$4.75

BS5/16-18X.87BAG25
5/16-18 x 7/8
5/16-18 x 7/8" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$5.25

BS5/16-18X100BAG25
5/16-18 x 1
5/16-18 x 1" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$5.50

BS5/16-18X125BAG25
5/16-18 x 1-1/4
5/16-18 x 1-1/4" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$5.75

BS5/16-18X150BAG25
5/16-18 x 1-1/2
5/16-18 x 1-1/2" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$6.25

BS5/16-18X175BAG25
5/16-18 x 1-3/4
5/16-18 x 1-3/4" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$6.75

BS5/16-18X200BAG25
5/16-18 x 2
5/16-18 x 2" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$7.25

BS5/16-18X225BAG25
5/16-18 x 2-1/4
5/16-18 x 2-1/4" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$7.75

BS5/16-18X250BAG25
5/16-18 x 2-1/2
5/16-18 x 2-1/2" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$7.75

BS5/16-18X275BAG25
5/16-18 x 2-3/4
5/16-18 x 2-3/4" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$8.00

BS5/16-18X300BAG25
5/16-18 x 3
5/16-18 x 3" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$8.00

BS5/16-18X325BAG25
5/16-18 x 3-1/4
5/16-18 x 3-1/4" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$8.50

BS5/16-18X350BAG10
5/16-18 x 3-1/2
5/16-18 x 3-1/2" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 10.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$8.50

BS5/16-18X400BAG10
5/16-18 x 4
5/16-18 x 4" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 10.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$5.75

BS5/16-18X425BAG10
5/16-18 x 4-1/4
5/16-18 x 4-1/4" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 10.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$6.25

BS5/16-18X450BAG10
5/16-18 x 4-1/2
5/16-18 x 4-1/2" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 10.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$6.75

BS5/16-18X500BAG10
5/16-18 x 5
5/16-18 x 5" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 10.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$7.25

BS5/16-18X550BAG10
5/16-18 x 5-1/2
5/16-18 x 5-1/2" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 10.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$8.25

BS5/16-18X600BAG10
5/16-18 x 6
5/16-18 x 6" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 10.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$9.25

BS5/16-18X700
5/16-18 x 7
5/16-18 x 7" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY THE PIECE.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$4.95

BS5/16-18X800
5/16-18 x 8
5/16-18 x 8" Hex Head Cap Bolts 18-8 / 304 Stainless Steel
  • SOLD BY THE PIECE.
  • Hex Head Cap Screws.
  • 18-8 / 304 Grade Stainless Steel.
  • 1/2" Wrench Size, 13/64" Head Height.
  • Contact Our Sales Department For Bulk Pricing.
$4.95

NHS5/16-18BAG25
5/16-18 Finish Hex Nuts 18-8 / 304 Stainless Steel
5/16-18 Finish Hex Nuts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • 5/16"-18 Coarse Thread Hex Nut,
  • 1/2" Flats-Wrench Size, 17/64" Thickness.
  • Made From 18-8 / 304 Stainless Steel.
  • Contact Our Sales Department For Bulk Pricing.
Special Pricing Available
$2.50

WFS5/16BAG
5/16
5/16" Flat Washers 18-8 / 304 Stainless Steel
  • SOLD IN BOXES OF 100.
  • 5/16" Standard Commercial Pattern Round Flat Washers.
  • Made From 18-8 / 304 Stainless Steel.
  • ID 0.343" OD 3/4" Thickness 0.050"
  • CONTACT OUR SALES DEPARTMENT FOR BULK PRICING.
Special Pricing Available
$4.75

NILS5/16-18BAG25
5/16-18 Nylon Insert Hex Lock Nuts 18-8 Stainless Steel
5/16-18 Nylon Insert Hex Lock Nuts 18-8 Stainless Steel
  • SOLD BY BAG OF 25.
  • 5/16"-18 Thread Nyloc Lock Nut
  • 1/2" Wrench Size.
  • Made From 18-8 / 304 Stainless Steel.
  • Contact Our Sales Department For Bulk Pricing.
Special Pricing Available
$4.25

NHCOUP5/16-18
5/16-18 Coupling Extention Nuts 18-8 / 304 Stainless Steel
5/16-18 Coupling Extention Nuts 18-8 / 304 Stainless Steel
  • SOLD BY THE PIECE.
  • Made From 18-8 / 304 Stainless Steel.
  • 7/16" Wrench Size
  • Length: 1"
  • Contact Our Sales Department For Bulk Pricing.
Special Pricing Available
$1.25

NILST5/16-18BAG25
5/16-18 THIN Nylon Insert Hex Jam Lock Nuts 18-8 / 304 Stainless Steel
5/16-18 THIN Nylon Insert Hex Jam Lock Nuts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Flats 0.502" Height 0.265"
  • 18-8 / 304 Grade Stainless Steel.
  • Contact Our Sales Department For Bulk Pricing.
Special Pricing Available
$6.25

WAN5/16-516BAG
5/16
5/16" AN Flat Washers 900 Series 18-8 / 304 Stainless Steel
  • SOLD BY THE BOX OF 100
  • 18-8 / 304 Stainless Steel
  • ID: .328
  • OD: .562
  • Thickness: 1/16"
  • AN960C516
Special Pricing Available
$4.50

WSAE5/16-812BAG
5/16
5/16" SAE Flat Washers 18-8 / 304 Stainless Steel
  • SOLD BY THE BOX OF 100 
  • 18-8 / 304 Stainless Steel
  • ID: .343
  • OD:  .687
  • Thickness: .051 - .080
  • SAE 15795-812
Special Pricing Available
$4.75

CHCSASST
Coarse Thread Hex Head Cap Screws, Nuts, Washers Assortment 18-8 Stainless Steel
Coarse Thread Hex Head Cap Screws, Nuts, Washers Assortment 18-8 Stainless Steel
  • Coarse Thread Hex Head Cap Screw Bolts, Nuts and Washers.
  • 198 Piece Assortment Kit Set In Clear Plastic Box.
  • 18-8 / 304 Stainless Steel.
  • Includes Sizes 1/4-20, 5/16-18, 3/8-16 
  • View Extended Info For Quantity.

 
$40.00

NHSCAP5/16-18BAG25
5/16-18 Hex Acorn Cap Nuts 18-8 / 304 Stainless Steel
5/16-18 Hex Acorn Cap Nuts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • 9/16" Wrench Size.
  • 17/32" Height Overall.
  • Made From 18-8 / 304 Stainless Steel.
  • Contact Our Sales Department For Bulk Pricing.
Special Pricing Available
$9.50

NWING5/16-18BAG25
5/16-18 Wing Nuts 18-8 / 304 Stainless Steel
5/16-18 Wing Nuts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • 18-8 / 304 Stainless Steel.
  • Wing Nut Span = 1.25 "
  • Contact Our Sales Department For Bulk Pricing.
Special Pricing Available
$6.75

NKLOCK5/16-18BAG25
5/16-18 Hex Kep K-Lock Nuts 18-8 / 304 Stainless Steel Keps
5/16-18 Hex Kep K-Lock Nuts 18-8 / 304 Stainless Steel Keps
  • SOLD BY BAG OF 25.
  • 1/2" Wrench Size.
  • 18-8 / 304 Grade Stainless Steel
  • Contact Our Sales Department For Bulk Pricing.
Special Pricing Available
$5.25

NHFLG5/16-18BAG25
5/16-18 Hex Serrated Flange Nuts 18-8 / 304 Stainless Steel
5/16-18 Hex Serrated Flange Nuts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • 18-8 / 304 Grade Stainless Steel.
  • Max Width Across Flats = .500
  • Contact Our Sales Department For Bulk Pricing.
Special Pricing Available
$7.00

NTEENUT5/16X3/8BAG10
5/16-18 x 3/8 T-Nuts 4 Prong 18-8 / 304 Stainless Steel Tee Nut
5/16-18 x 3/8 T-Nuts 4 Prong 18-8 / 304 Stainless Steel Tee Nut
  • SOLD BY BAG OF 10..
  • 3/8" Barrel Length
  • 4 Prongs
  • Made From 18-8 / 304 Grade Stainless Steel.
Special Pricing Available
$9.50

NJS5/16-18BAG25
5/16-18 Thin Hex Jam Nuts 18-8 / 304 Stainless Steel
5/16-18 Thin Hex Jam Nuts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • 1/2" Wrench Size
  • Thickness: 3/16"
  • Contact Our Sales Department For Bulk Pricing
Special Pricing Available
$4.50

NHHS5/16-18BAG25
5/16-18 Heavy Hex Finish Nuts 18-8 / 304 Stainless Steel
5/16-18 Heavy Hex Finish Nuts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Extra Thick Hex Finish Nuts
  • Flats 9/16" Height 19/64"
  • Made From 18-8 / 304 Stainless Steel.
  • Contact Our Sales Department For Bulk Pricing.
Special Pricing Available
$8.00

NILSDOM5/16-18BAG25
5/16-18 Lock Nuts Purple Insert - Waxed 18-8 / 304 Stainless Steel
5/16-18 Lock Nuts Purple Insert - Waxed 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • 18-8 / 304 Grade Stainlesss Steel
  • Waxed Lock Nut to Prevent Galling
  • 1/2" Wrench Size
  • Contact Our Sales Department for Bulk and Wholesale Pricing
Special Pricing Available
$8.25

WLS5/16BAG
5/16
5/16" Split Ring Lock Washers 18-8 / 304 Stainless Steel
  • SOLD IN BOXES OF 100.
  • 5/16" Medium Profile Split Ring Lock Washers.
  • Made From 18-8 / 304 Stainless Steel.
  • ID 0.314" OD 0.583" Thickness 0.078"
  • CONTACT OUR SALES DEPARTMENT FOR BULK PRICING.
Special Pricing Available
$5.00

WFDS5/16X125BAG25
5/16
5/16" x 1-1/4" Fender Washers 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Large OD Flat Fender Washers
  • Made From 18-8 / 304 Stainless Steel
  • Thickness: .050
  • CONTACT OUR SALES DEPARTMENT FOR BULK PRICING.
Special Pricing Available
$4.25

WFDS5/16X150BAG25
5/16
5/16" x 1-1/2" Fender Washers 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Large OD Flat Fender Washers
  • Made From 18-8 / 304 Stainless Steel
  • Thickness: .062
  • CONTACT OUR SALES DEPARTMENT FOR BULK PRICING.
Special Pricing Available
$5.00

WFDS5/16X200BAG25
5/16
5/16" x 2" Fender Washers 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Large OD Flat Fender Washers
  • Made From 18-8 / 304 Stainless Steel
  • Thickness: .062
  • CONTACT OUR SALES DEPARTMENT FOR BULK PRICING.
$10.00

WFSL5/16BAG25
5/16
5/16" x 7/8" Large OD Flat Washers 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • Made From 18-8 / 304 Stainless Steel.
  • 7/8" OD.
  •  CONTACT OUR SALES DEPARTMENT FOR BULK PRICING.
Special Pricing Available
$3.00

WINLW5/16BAG25
5/16
5/16" Internal Tooth Lock Washers 410 Stainless Steel
  • SOLD BY BAG OF 25.
  • 410 Grade Stainless Steel.
  • Serrated INTERNAL Tooth Star Washers. 
  • Please Contact Our Sales Department For Bulk Pricing.
Special Pricing Available
$7.25

WEXLW5/16BAG25
5/16
5/16" External Tooth Lock Washers 410 Stainless Steel
  • SOLD BY BAG OF 25.
  • 410 Grade Stainless Steel.
  • Serrated EXTERNAL Tooth Star Washers. 
  • Please Contact Our Sales Department For Bulk Pricing.
Special Pricing Available
$5.50

WNPW5/16BAG25
5/16
5/16" Neoprene Bonded Sealing Washers 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • 18-8 / 304 Stainless Steel.
  • Neoprene Backed EPDM Rubber Seal Washer
  • OD: .750"
  • Please Contact Our Sales Department For Bulk Pricing.
Special Pricing Available
$7.25