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Tamper Proof Machine Screws, Star Pin-In Button Head, Stainless Steel 18-8, (T-8) #4-40 x 3/8

Diameter - Thread Pitch: #4-40

  • Tamper Proof Star Drive Size - T-8
  • Torx styled Star (with pin) drive add security to machine screws by using an uncommon drive
  • Less likely to strip than Phillips when installed correctly
  • Primarily for metal to metal applications
  • A machine screw is commonly identified by its small size
  • 18-8 Stainless steel is the fastener industry standard adding rust and corrosion resistance to an assembly

#4-40 Star with pin button head security machine screws are available in grade 18-8 stainless steel.

Product number: 840012
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Click on a size/sku in the table to view product-specific details and specifications.

Specifications

  • Color: Silver
  • Condition: New
  • Corrosion Resistant: Yes
  • Diameter: #4
  • Drive Style: Star (with Pin)
  • Head Type: Button Head
  • Tamper Proof: Yes
  • Thread Direction: Right Hand
  • Thread Type: Coarse
  • Fit: 2A
  • Grade: 18-8
  • Head Height Max: 0.06
  • Head Diameter: Max 0.208 - Min 0.200
  • Head Style: Button
  • Length: 3/8
  • Material: Stainless Steel
  • Overall Head Height: Max 0.060 - Min 0.055
  • Part Number: 618930280302
  • Product Type: Tamper Proof Machine Screws
  • Size Type: Regular
  • System of Measurement: Inch
  • Thread Direction: Right Hand
  • Thread Pitch: 40 Per Inch
  • Thread Size: #4-40
  • Thread Standard: UNC
  • Thread Type: Coarse
  • Tolerance (IFI): Actual measurements may vary slightly +/- depending on production run within IFI Tolerances
  • Star TP Drive: T-8
  • Weight: 1 lb
Select Size/SKU & Quantity
3 Available Sizes
SIZE/SKU Review Volume Pricing* Enter Any Qty
#4-40 x 1/4"
840002
1
$0.53 ($0.53/ea)
100
$48.00 ($0.48/ea)
1000
$450.00 ($0.45/ea)
$0.00
#4-40 x 3/8"
840012
1
$0.59 ($0.59/ea)
100
$56.00 ($0.56/ea)
1000
$520.00 ($0.52/ea)
$0.00
#4-40 x 1/2"
840022
1
$0.65 ($0.65/ea)
100
$59.00 ($0.59/ea)
1000
$580.00 ($0.58/ea)
$0.00

Frequently Used With

Flat Washers, Stainless Steel 304, #4 (.125 ID x .312 OD x .031 Thick) Flat Washers, Stainless Steel 304, #4 (.125 ID x .312 OD x .031 Thick)
Volume Pricing*
1
$0.07
($0.07/ea)
100
$2.00
($0.02/ea)
1000
$10.00
($0.01/ea)
$0.00
Lock Washers, Split Ring, Stainless Steel 304, #4 (.114 ID x .209 OD x .025 Thick) Lock Washers, Split Ring, Stainless Steel 304, #4 (.114 ID x .209 OD x .025 Thick)
Volume Pricing*
1
$0.07
($0.07/ea)
100
$3.00
($0.03/ea)
1000
$20.00
($0.02/ea)
$0.00
Hex Machine Nuts, Stainless Steel 304, #4-40 (1/4 Flats x 3/32 Thick) Hex Machine Nuts, Stainless Steel 304, #4-40 (1/4 Flats x 3/32 Thick)
Volume Pricing*
1
$0.07
($0.07/ea)
100
$4.00
($0.04/ea)
1000
$30.00
($0.03/ea)
$0.00
Nylon Lock Nuts, Stainless Steel 304, #4-40 (.251 Flats x .153 Height) Nylon Lock Nuts, Stainless Steel 304, #4-40 (.251 Flats x .153 Height)
Volume Pricing*
1
$0.07
($0.07/ea)
100
$4.00
($0.04/ea)
1000
$30.00
($0.03/ea)
$0.00
Tamper Proof Insert Bits, Star Drive 6-Lobe Torx, T-8 Tamper Proof Insert Bits, Star Drive 6-Lobe Torx, T-8
Volume Pricing*
1
$1.37
($1.37/ea)
100
$115.00
($1.15/ea)
1000
$1,110.00
($1.11/ea)
$0.00
Star Drive Tamper Proof T8 Round Blade Screwdriver Star Drive Tamper Proof T8 Round Blade Screwdriver
Volume Pricing*
$7.80 ea.
$0.00
MRO Solution 2400, Marine Grade Anti-Seize Lubricant, 8 oz. MRO Solution 2400, Marine Grade Anti-Seize Lubricant, 8 oz.
Volume Pricing*
$20.03 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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