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4-40 Flat Head Socket Cap Screws 18-8 / 304 Stainless Steel

  • Flat Head Socket Screws are Sometimes Called Flat Socket Head Cap Screw, Socket Screws, Allen Flat Socket Bolts or Flat Socket Machine Screw.
  • A Flat Socket Head Cap Screw is a Fastener Driven by a Socket Hex Allen Wrench.
  • The Hexagonal Drive or Hex Key L Wrench Allows For Stronger Tightening Compared to Screws that use a Phillips or Flat Head Screw Driver That Sometimes Tend To Strip The Head Of The Screw.
  • Flat Head Cap Screws are Made to Fit Flush When Installed.
  • We Carry Flat Socket Screw Bolts in 18-8 / 304 Stainless Steel Which Is More Corrosion Resistant.
  • These are the Most Popular Flat Head Socket Cap Allen Wrench Screws for Many Production Applications.
  • #4-40 Right Hand Thread, UNC
  • Please View Matching Nuts & Washers Below. 


Item # Image Description Price
FHSHCS440X.19BAG
4-40 x 3/16
4-40 x 3/16" Flat Socket Cap Screws 18-8 / 304 Stainless Steel
  • SOLD IN BOXES OF 100.
  • 18-8 / 304 Stainless Steel.
  • Flat Head Socket Cap Screws
  • Hex Key Size = 1/16"
  • Contact Our Sales Department For Bulk Pricing.
$5.00

FHSHCS440X.25BAG
4-40 x 1/4
4-40 x 1/4" Flat Socket Cap Screws 18-8 / 304 Stainless Steel
  • SOLD IN BOXES OF 100.
  • 18-8 / 304 Stainless Steel.
  • Flat Head Socket Cap Screws
  • Hex Key Size = 1/16"
  • Contact Our Sales Department For Bulk Pricing.
$5.25

FHSHCS440X.38BAG
4-40 x 3/8
4-40 x 3/8" Flat Socket Cap Screws 18-8 / 304 Stainless Steel
  • SOLD IN BOXES OF 100.
  • 18-8 / 304 Stainless Steel.
  • Flat Head Socket Cap Screws
  • Hex Key Size = 1/16"
  • Contact Our Sales Department For Bulk Pricing.
$5.50

FHSHCS440X.50BAG
4-40 x 1/2
4-40 x 1/2" Flat Socket Cap Screws 18-8 / 304 Stainless Steel
  • SOLD IN BOXES OF 100.
  • 18-8 / 304 Stainless Steel.
  • Flat Head Socket Cap Screws
  • Hex Key Size = 1/16"
  • Contact Our Sales Department For Bulk Pricing.
$5.75

FHSHCS440X.63BAG
4-40 x 5/8 Flat Socket Cap Screws 18-8 / 304 Stainless Steel
4-40 x 5/8 Flat Socket Cap Screws 18-8 / 304 Stainless Steel
  • SOLD IN BOXES OF 100.
  • 18-8 / 304 Stainless Steel.
  • Flat Head Socket Cap Screws
  • Hex Key Size = 1/16"
  • Contact Our Sales Department For Bulk Pricing.
$6.25

FHSHCS440X.75BAG
4-40 x 3/4
4-40 x 3/4" Flat Socket Cap Screws 18-8 / 304 Stainless Steel
  • SOLD IN BOXES OF 100.
  • 18-8 / 304 Stainless Steel.
  • Flat Head Socket Cap Screws
  • Hex Key Size = 1/16"
  • Contact Our Sales Department For Bulk Pricing.
$6.50

NHS4-40BAG
4-40 Finish Hex Machine Screw Nuts Stainless Steel
4-40 Finish Hex Machine Screw Nuts Stainless Steel
  • SOLD IN BOXES OF 100.
  • #4-40 Machine Nut 1/4" Wrench Size.
  • Thickness 3/32"
  • Made From 18-8 / 304 Stainless Steel.
  • Contact Our Sales Department For Bulk Pricing.
Special Pricing Available
$5.00

NILS4-40BAG
4-40 Nylon Insert Hex Lock Nuts 18-8 Stainless Steel
4-40 Nylon Insert Hex Lock Nuts 18-8 Stainless Steel
  • SOLD IN BOXES OF 100.
  • #4-40 Thread Nyloc Lock Nut
  • 1/4" Wrench Size.
  • Made From 18-8 / 304 Stainless Steel.
  • Contact Our Sales Department For Bulk Pricing.
$4.00

NKLOCK4-40BAG
4-40 Hex Kep K-Lock Nuts 18-8 / 304 Stainless Steel Keps
4-40 Hex Kep K-Lock Nuts 18-8 / 304 Stainless Steel Keps
  • SOLD IN BOXES OF 100.
  • 1/4" Wrench Size.
  • 18-8 / 304 Grade Stainless Steel
  • Contact Our Sales Department For Bulk Pricing.
$4.25

NILST4-40BAG
4-40 THIN Nylon Insert Hex Jam Lock Nuts 18-8 / 304 Stainless Steel
4-40 THIN Nylon Insert Hex Jam Lock Nuts 18-8 / 304 Stainless Steel
  • SOLD BY THE BOX OF 100.
  • Flats 0.251", Height 0.125"
  • 18-8 / 304 Grade Stainless Steel.
  • Contact Our Sales Department For Bulk Pricing.
Special Pricing Available
$5.00

WFS04BAG
#4 Flat Washers 18-8 / 304 Stainless Steel
#4 Flat Washers 18-8 / 304 Stainless Steel
  • SOLD IN BOXES OF 100.
  • #4 Standard Commercial Pattern Round Flat Washers.
  • Made From 18-8 / 304 Stainless Steel.
  • ID 0.125" OD 0.312" Thickness 0.031"
  • CONTACT OUR SALES DEPARTMENT FOR BULK PRICING.
$3.00

WLS04BAG
#4 Split Ring Lock Washers 18-8 / 304 Stainless Steel
#4 Split Ring Lock Washers 18-8 / 304 Stainless Steel
  • SOLD IN BOXES OF 100.
  • Medium Profile Split Ring Lock Washers.
  • Made From 18-8 / 304 Stainless Steel.
  • ID 0.114" OD 0.209" Thickness 0.025"
  • CONTACT OUR SALES DEPARTMENT FOR BULK PRICING.
Special Pricing Available
$3.00

WFIS04BAG
#4 Cup Finishing Washers 18-8 / 304 Stainless Steel
#4 Cup Finishing Washers 18-8 / 304 Stainless Steel
  • SOLD IN BOXES OF 100
  • 18-8 / 304 Stainless Steel For Corrosion Resistance
  • ID: .159"
  • OD: .379"
  • Thickness: .082"
Special Pricing Available
$2.75

WINLW04BAG
#4 Internal Tooth Lock Washers 410 Stainless Steel
#4 Internal Tooth Lock Washers 410 Stainless Steel
  • SOLD IN BOXES OF 100.
  • 410 Grade Stainless Steel.
  • Serrated INTERNAL Tooth Star Washers 
  • Please Contact Our Sales Department For Bulk Pricing.
$3.00

WSAE4-803BAG
#4 SAE Flat Washers 18-8 / 304 Stainless Steel
#4 SAE Flat Washers 18-8 / 304 Stainless Steel
  • SOLD BY THE BOX OF 100
  • 18-8 / 304 Stainless Steel
  • ID: .125
  • OD:  .250
  • Thickness: .017 - .028
  • SAE 15795-803
Special Pricing Available
$4.25

NHSCAP4-40BAG25
4-40 Hex Acorn Cap Nuts 18-8 / 304 Stainless Steel
4-40 Hex Acorn Cap Nuts 18-8 / 304 Stainless Steel
  • SOLD BY BAG OF 25.
  • 1/4" Wrench Size.
  • 1/4" Height Overall
  • Made From 18-8 / 304 Stainless Steel.
  • Contact Our Sales Department For Bulk Pricing.
Special Pricing Available
$7.50