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5/16-18 Stainless Steel Phillips Flat Head Machine Screws

  • 18-8 Stainless Steel Includes 303 & 304 Grades
  • 5/16-18 Right Hand Thread, UNC 
  • Fully Threaded
  • Rust and Corrosion Resistant
  • Flat Head Machine Screws Are Designed To Sit Flush Once Installed 
  • Standards: ANSI B18.6.3
  • Please View Matching Nuts & Washers Below.


Item # Image Description Price
FHMSX5/16X.500BAG25
5/16-18 x 1/2
5/16-18 x 1/2" Phillips Flat Head Machine Screws 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • 18-8 / 304 Stainless Steel
  • Diameter - Thread Pitch: 5/16"-18
  • Fully Threaded
  • Phillips Drive Head #4
  • Contact Our Sales Department For Buld Pricing!
Special Pricing Available
$8.50

FHMSX5/16X.625BAG25
5/16-18 x 5/8
5/16-18 x 5/8" Phillips Flat Head Machine Screws 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25
  • #4 Phillips Drive
  • 5/16"-18 Thread Pitch
  • 18-8 / 304 Grade Stainless Steel.
  • Contact our Sales Department for Bulk Pricing.
    • Special Pricing Available
    $8.75

    FHMSX5/16X.750BAG25
    5/16-18 x 3/4
    5/16-18 x 3/4" Phillips Flat Head Machine Screws 18-8 / 304 Stainless Steel
    • SOLD BY BAG OF 25.
    • 18-8 / 304 Stainless Steel
    • Diameter - Thread Pitch: 5/16"-18
    • Fully Threaded
    • Phillips Drive Head #4
    • Contact Our Sales Department For Buld Pricing!
    Special Pricing Available
    $9.50

    FHMSX5/16X100BAG25
    5/16-18 x 1
    5/16-18 x 1" Phillips Flat Head Machine Screws 18-8 / 304 Stainless Steel
    • SOLD BY BAG OF 25.
    • 18-8 / 304 Stainless Steel
    • Diameter - Thread Pitch: 5/16"-18
    • Fully Threaded
    • Phillips Drive Head #4
    • Contact Our Sales Department For Buld Pricing!
    Special Pricing Available
    $9.75

    FHMSX5/16X125BAG25
    5/16-18 x 1-1/4
    5/16-18 x 1-1/4" Phillips Flat Head Machine Screws 18-8 / 304 Stainless Steel
    • SOLD BY BAG OF 25.
    • 18-8 / 304 Stainless Steel
    • Diameter - Thread Pitch: 5/16"-18
    • Fully Threaded
    • Phillips Drive Head #4
    • Contact Our Sales Department For Buld Pricing!
    Special Pricing Available
    $10.50

    FHMSX5/16X150BAG25
    5/16-18 x 1-1/2
    5/16-18 x 1-1/2" Phillips Flat Head Machine Screws 18-8 / 304 Stainless Steel
    • SOLD BY BAG OF 25.
    • 18-8 / 304 Stainless Steel
    • Diameter - Thread Pitch: 5/16"-18
    • Fully Threaded
    • Phillips Drive Head #4
    • Contact Our Sales Department For Buld Pricing!
    Special Pricing Available
    $11.50

    FHMSX5/16X175BAG25
    5/16-18 x 1-3/4
    5/16-18 x 1-3/4" Phillips Flat Head Machine Screws 18-8 / 304 Stainless Steel
    • SOLD BY BAG OF 25.
    • 18-8 / 304 Stainless Steel
    • Diameter - Thread Pitch: 5/16"-18
    • Fully Threaded
    • Phillips Drive Head #4
    • Contact Our Sales Department For Buld Pricing!
    Special Pricing Available
    $12.50

    FHMSX5/16X200BAG25
    5/16-18 x 2
    5/16-18 x 2" Phillips Flat Head Machine Screws 18-8 / 304 Stainless Steel
    • SOLD BY BAG OF 25.
    • 18-8 / 304 Stainless Steel
    • Diameter - Thread Pitch: 5/16"-18
    • Fully Threaded
    • Phillips Drive Head #4
    • Contact Our Sales Department For Buld Pricing!
    Special Pricing Available
    $14.50

    FHMSX5/16X225BAG25
    5/16-18 x 2-1/4
    5/16-18 x 2-1/4" Phillips Flat Head Machine Screws 18-8 / 304 Stainless Steel
    • SOLD BY BAG OF 25.
    • 18-8 / 304 Stainless Steel
    • Diameter - Thread Pitch: 5/16"-18
    • Fully Threaded
    • Phillips Drive Head #4
    • Contact Our Sales Department For Buld Pricing!
    Special Pricing Available
    $15.50

    FHMSX5/16X250BAG25
    5/16-18 x 2-1/2
    5/16-18 x 2-1/2" Phillips Flat Head Machine Screws 18-8 / 304 Stainless Steel
    • SOLD BY BAG OF 25.
    • 18-8 / 304 Stainless Steel
    • Diameter - Thread Pitch: 5/16"-18
    • Fully Threaded
    • Phillips Drive Head #4
    • Contact Our Sales Department For Buld Pricing!
    Special Pricing Available
    $16.50

    FHMSX5/16X300BAG10
    5/16-18 x 3
    5/16-18 x 3" Phillips Flat Head Machine Screws Stainless Steel
    • SOLD BY BAG OF 10.
    • 18-8 / 304 Stainless Steel
    • Diameter - Thread Pitch: 5/16"-18
    • Fully Threaded
    • Phillips Drive Head #4
    • Contact Our Sales Department For Buld Pricing!
    Special Pricing Available
    $11.25

    FHMSX5/16X350BAG10
    5/16-18 x 3-1/2
    5/16-18 x 3-1/2" Phillips Flat Head Machine Screws Stainless Steel
    • SOLD BY BAG OF 10.
    • 18-8 / 304 Stainless Steel
    • Diameter - Thread Pitch: 5/16"-18
    • Fully Threaded
    • Phillips Drive Head #4
    • Contact Our Sales Department For Buld Pricing!
    Special Pricing Available
    $12.50

    FHMSX5/16X400BAG10
    5/16-18 x 4
    5/16-18 x 4" Phillips Flat Head Machine Screws Stainless Steel
    • SOLD BY BAG OF 10.
    • 18-8 / 304 Stainless Steel
    • Diameter - Thread Pitch: 5/16"-18
    • Fully Threaded
    • Phillips Drive Head #4
    • Contact Our Sales Department For Buld Pricing!
    Special Pricing Available
    $14.50

    FHMSX5/16X500
    5/16-18 x 5
    5/16-18 x 5" Phillips Flat Head Machine Screws Stainless Steel
    • SOLD BY THE PIECE.
    • 18-8 / 304 Stainless Steel
    • Diameter - Thread Pitch: 5/16"-18
    • Fully Threaded
    • Phillips Drive Head #4
    • Contact Our Sales Department For Buld Pricing!
    Special Pricing Available
    $2.50

    FHMSX5/16X600
    5/16-18 x 6
    5/16-18 x 6" Phillips Flat Head Machine Screws Stainless Steel
    • SOLD BY THE PIECE.
    • 18-8 / 304 Stainless Steel
    • Diameter - Thread Pitch: 5/16"-18
    • Fully Threaded
    • Phillips Drive Head #4
    • Contact Our Sales Department For Buld Pricing!
    Special Pricing Available
    $3.75

    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

    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

    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

    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

    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

    WFIS5/16BAG25
    5/16 Cup Finishing Washers 18-8 / 304 Stainless Steel
    5/16 Cup Finishing Washers 18-8 / 304 Stainless Steel
    • SOLD BY BAG OF 25.
    • 18-8 / 304 Stainless Steel For Corrosion Resistance
    • ID: .344"
    • OD: .892"
    • Thickness: .161"
    Special Pricing Available
    $7.50

    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