1/4-20×7/8 Fillister Head Slotted Machine Screws 18-8 Stainless steel

100.00

1/4-20×7/8 Fillister Head Slotted Machine Screws 18-8 Stainless steel

The 1/4-20 × 7/8 inch Fillister Head Slotted Machine Screw is a corrosion-resistant threaded fastener designed for securing metal, plastic, wood, or composite components where a high-profile cylindrical head is preferred. The fillister head provides greater driving surface and increased head strength compared to a pan head, while the slotted drive allows installation using a standard flat-blade screwdriver.

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Description

Technical Specifications

Parameter Specification
Fastener Type Machine Screw
Thread Size 1/4-20 UNC
Thread Diameter 0.250 in (6.35 mm)
Thread Pitch 20 TPI (1.27 mm pitch)
Length 7/8 in (22.23 mm), measured from underside of head
Head Style Fillister Head
Drive Type Slotted
Thread Type Unified National Coarse (UNC)
Material 18-8 Austenitic Stainless Steel
Finish Plain, natural stainless steel
Corrosion Resistance Excellent for indoor and outdoor environments
Magnetic Properties Generally non-magnetic (may become slightly magnetic after cold working)
Standard Commonly manufactured to ASME B18.6.3 machine screw dimensions
Strength Comparable to ASTM F593 Group 1 (varies by manufacturer)

Material Properties (18-8 Stainless Steel)

  • Composition: Approximately 18% Chromium, 8% Nickel
  • Good resistance to rust, oxidation, and many chemicals
  • Suitable for humid, marine, and industrial environments
  • Operating temperature: Approximately −196°C to +870°C (application dependent)
  • Good mechanical strength and toughness

Fillister Head Features

  • Tall cylindrical head with a slightly rounded top
  • Deeper slot than standard round-head screws
  • Larger bearing surface than round-head screws
  • Provides increased tightening torque
  • Ideal where the screw head remains visible

Typical Applications

  • Electrical and electronic equipment
  • Industrial machinery
  • Aircraft ground support equipment
  • Control panels and enclosures
  • Instrument assemblies
  • Marine hardware
  • Laboratory equipment
  • Maintenance, repair, and overhaul (MRO)

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