You are here: Home > Screws > Screws, Machine

Machine Screws

Sort By:
Page of 5
10 M 5-0.8 x 40 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 10 M 5-0.8 x 40 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws

  • Zinc Plated

  • JIS B 1111

  • Diameter: M 5
  • Thread Pitch: 0.8

  • Length: 40mm

  • Head Diameter: 9mm

  • Head Height: 3.3mm

  • Drive Size: # 2

  • Thread Length: Full Thread

  • 10 Per Package
  • Package Price: $2.28
    Free Shipping
    10 M 5-0.8 x 45 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 10 M 5-0.8 x 45 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 5
  • Thread Pitch: 0.8
  • Length: 45mm
  • Head Diameter: 9mm
  • Head Height: 3.3mm
  • Drive Size: # 2
  • Thread Length: Full Thread
  • 10 Per Package
  • Package Price: $2.52
    Free Shipping
    25 M 5-0.8 x 8 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 25 M 5-0.8 x 8 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 5
  • Thread Pitch: 0.8
  • Length: 8mm
  • Head Diameter: 9mm
  • Head Height: 3.3mm
  • Drive Size: # 2
  • Thread Length: Full Thread
  • 25 Per Package
  • Package Price: $2.82
    Free Shipping
    25 M 5-0.8 x 10 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 25 M 5-0.8 x 10 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 5
  • Thread Pitch: 0.8
  • Length: 10mm
  • Head Diameter: 9mm
  • Head Height: 3.3mm
  • Drive Size: # 2
  • Thread Length: Full Thread
  • 25 Per Package
  • Package Price: $2.82
    Free Shipping
    25 M 5-0.8 x 12 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 25 M 5-0.8 x 12 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 5
  • Thread Pitch: 0.8
  • Length: 12mm
  • Head Diameter: 9mm
  • Head Height: 3.3mm
  • Drive Size: # 2
  • Thread Length: Full Thread
  • 25 Per Package
  • Package Price: $2.94
    Free Shipping
    10 M 6-1.0 x 25 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 10 M 6-1.0 x 25 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 6
  • Thread Pitch: 1.0
  • Length: 25mm
  • Head Diameter: 10.5mm
  • Head Height: 3.9mm
  • Drive Size: # 3
  • Thread Length: Full Thread
  • 10 Per Package
  • Package Price: $3.12
    Free Shipping
    25 M 5-0.8 x 5 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 25 M 5-0.8 x 5 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 5
  • Thread Pitch: 0.8
  • Length: 5mm
  • Head Diameter: 9mm
  • Head Height: 3.3mm
  • Drive Size: # 2
  • Thread Length: Full Thread
  • 25 Per Package
  • Package Price: $3.15
    Free Shipping
    25 M 5-0.8 x 6 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 25 M 5-0.8 x 6 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 5
  • Thread Pitch: 0.8
  • Length: 6mm
  • Head Diameter: 9mm
  • Head Height: 3.3mm
  • Drive Size: # 2
  • Thread Length: Full Thread
  • 25 Per Package
  • Package Price: $3.15
    Free Shipping
    10 M 6-1.0 x 30 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 10 M 6-1.0 x 30 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 6
  • Thread Pitch: 1.0
  • Length: 30mm
  • Head Diameter: 10.5mm
  • Head Height: 3.9mm
  • Drive Size: # 3
  • Thread Length: Full Thread
  • 10 Per Package
  • Package Price: $3.24
    Free Shipping
    25 M 5-0.8 x 14 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 25 M 5-0.8 x 14 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 5
  • Thread Pitch: 0.8
  • Length: 14mm
  • Head Diameter: 9mm
  • Head Height: 3.3mm
  • Drive Size: # 2
  • Thread Length: Full Thread
  • 25 Per Package
  • Package Price: $3.36
    Free Shipping
    10 M 6-1.0 x 35 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 10 M 6-1.0 x 35 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 6
  • Thread Pitch: 1.0
  • Length: 35mm
  • Head Diameter: 10.5mm
  • Head Height: 3.9mm
  • Drive Size: # 3
  • Thread Length: Full Thread
  • 10 Per Package
  • Package Price: $3.78
    Free Shipping
    6-32 X 1/2 Phillips Pan Head M.S. Zinc 6-32 X 1/2" Phillips Pan Head Machine Screws Zinc

  • #6-32 x 1/2"
  • Phillips Pan Head Machine Screws
  • Zinc
  • 100 Per Package

  • View Catalog Page

    Package Price: $3.88
    Free Shipping
    6-32 X 3/8 Phillips Pan Head M.S. Zinc 6-32 X 3/8" Phillips Pan Head Machine Screws Zinc

  • #6-32 x 3/8"
  • Phillips Pan Head Machine Screws
  • Zinc
  • 100 Per Package

  • View Catalog Page

    Package Price: $4.12
    Free Shipping
    6mm-1.00 X 12mm Phillips Pan Head Metric Machine Screw 6mm-1.00 X 12mm Phillips Pan Head Metric Machine Screw

  • Machine Screw
  • Screw Size : 6MM
  • Length : 16MM
  • Finish : Zinc
  • Head Style : Phillips Pan
  • 25 Per Package
  • Package Price: $4.12
    Free Shipping
    10 M 6-1.0 x 40 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 10 M 6-1.0 x 40 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 6
  • Thread Pitch: 1.0
  • Length: 40mm
  • Head Diameter: 10.5mm
  • Head Height: 3.9mm
  • Drive Size: # 3
  • Thread Length: Full Thread
  • 10 Per Package
  • Package Price: $4.14
    Free Shipping
    25 M 5-0.8 x 16 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 25 M 5-0.8 x 16 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 5
  • Thread Pitch: 0.8
  • Length: 16mm
  • Head Diameter: 9mm
  • Head Height: 3.3mm
  • Drive Size: # 2
  • Thread Length: Full Thread
  • 25 Per Package
  • Package Price: $4.32
    Free Shipping
    25 M 5-0.8 x 20 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 25 M 5-0.8 x 20 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 5
  • Thread Pitch: 0.8
  • Length: 20mm
  • Head Diameter: 9mm
  • Head Height: 3.3mm
  • Drive Size: # 2
  • Thread Length: Full Thread
  • 25 Per Package
  • Package Price: $4.35
    Free Shipping
    25 M 5-0.8 x 25 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 25 M 5-0.8 x 25 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 5
  • Thread Pitch: 0.8
  • Length: 25mm
  • Head Diameter: 9mm
  • Head Height: 3.3mm
  • Drive Size: # 2
  • Thread Length: Full Thread
  • 25 Per Package
  • Package Price: $4.35
    Free Shipping
    10 M 6-1.0 x 28 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 10 M 6-1.0 x 28 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 6
  • Thread Pitch: 1.0
  • Length: 28mm
  • Head Diameter: 10.5mm
  • Head Height: 3.9mm
  • Drive Size: # 3
  • Thread Length: Full Thread
  • 10 Per Package
  • Package Price: $4.44
    Free Shipping
    Din 85 - 4mm X 10mm Machine Screws 4mm X 10mm Slotted Pan Head Metric Machine Screws

  • Slotted Pan Head Metric Machine Screws
  • Zinc Plated
  • DIN 85
  • Thread: 4mm-.70
  • Length: 10mm
  • 25 Per Package

  • View Catalog Page

    Package Price: $4.61
    Free Shipping
    Din 963 - 4mm X 8mm Machine Screw 4mm X 8mm Slotted Flat Head Metric Machine Screw Din 963

  • Slotted Flat Head Metric Machine Screws
  • Diameter & Pitch: 4mm-.70
  • Length: 8mm
  • 25 Per Package

    View Catalog Page
  • Package Price: $4.66
    Free Shipping
    Phillips Round Head M.S. 6-32 X 1/2 Phillips Round Head M.S. 6-32 X 1/2

  • Phillips Round Head Machine Screw
  • Zinc Plated
  • Size: 6-32 x 1/2"
  • 100 Per Package

    View Catalog Page
  • Package Price: $4.66
    Free Shipping
    10 M 6-1.0 x 45 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 10 M 6-1.0 x 45 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 6
  • Thread Pitch: 1.0
  • Length: 45mm
  • Head Diameter: 10.5mm
  • Head Height: 3.9mm
  • Drive Size: # 3
  • Thread Length: Full Thread
  • 10 Per Package
  • Package Price: $4.74
    Free Shipping
    25 M 5-0.8 x 18 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 25 M 5-0.8 x 18 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 5
  • Thread Pitch: 0.8
  • Length: 18mm
  • Head Diameter: 9mm
  • Head Height: 3.3mm
  • Drive Size: # 2
  • Thread Length: Full Thread
  • 25 Per Package
  • Package Price: $4.80
    Free Shipping
    M5 - 0.8 x 10mm  Phillips Hex Head SEMS Screw, Class 8.8 M5 - 0.8 x 10mm Phillips Hex Head SEMS Screw Class 8.8

    Phillips Indented Hexagon Head Machine Screw Sems with Split Lock Washer and Flat Washer.

  • Yellow Zinc
  • Class 8.8
  • JIS B 1187
  • Diameter: M5
  • Thread Pitch: 0.8
  • Length: 10mm
  • Head Height: 3.5mm
  • Hex Width: 8mm
  • Drive Size: #2
  • Washer Diameter: 10mm
  • Fully Threaded
  • 25 Per Package
  • Package Price: $4.81
    Free Shipping
    6/32 X 3/8 Slotted Rd Hd Mach Sc. Zinc 6-32 X 3/8" Slotted Round Head Machine Screw Zinc

  • Slotted Round Head Machine Screws
  • Bright Zinc Chromate Finish
  • Size: 6-32 x 3/8"
  • 100 Per Package

  • View Catalog Page

    Package Price: $4.85
    Free Shipping
    10 M 6-1.0 x 50 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 10 M 6-1.0 x 50 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 6
  • Thread Pitch: 1.0
  • Length: 50mm
  • Head Diameter: 10.5mm
  • Head Height: 3.9mm
  • Drive Size: # 3
  • Thread Length: Full Thread
  • 10 Per Package
  • Package Price: $4.89
    Free Shipping
    8-32 X 1/2 Phillips Pan Head M.S. Zinc 8-32 X 1/2" Phillips Pan Head Machine Screws Zinc

  • #8-32 x 1/2"
  • Phillips Pan Head Machine Screws
  • Zinc
  • 100 Per Package

  • View Catalog Page

    Package Price: $4.95
    Free Shipping
    6 - 1.00 X 16mm Phillips Pan Head Machine Screws 6 - 1.00 X 16mm Phillips Pan Head Machine Screws

  • 6 - 1.00 x 16mm  
  • Phillips Pan Head Machine Screws
  • Zinc Finish
  • 50 Per Package

    Package Price: $4.99
    Free Shipping
  • 6 - 1.00 X 20mm Phillips Pan Head Machine Screws 6 - 1.00 X 20mm Phillips Pan Head Machine Screws

  • Phillips Pan Head Machine Screws
  • 6 - 1.00 x 20mm
  • Zinc Finish
  • 50 Per Package
  • Package Price: $4.99
    Free Shipping
    M4 - 0.7 x 14mm  Phillips / Hex Head SEMS Screw, Class 8.8 M4 - 0.7 x 14mm Phillips Hex Head SEMS Screw Class 8.8

    Phillips Indented Hexagon Head Machine Screw Sems with Split Lock Washer and Flat Washer.

  • Yellow Zinc
  • Class 8.8
  • JIS B 1187
  • Diameter: M4
  • Thread Pitch: 0.7
  • Length: 14mm
  • Head Height: 2.8mm
  • Hex Width: 7mm
  • Drive Size: #2
  • Washer Diameter: 9mm
  • Fully Threaded
  • 25 Per Package
  • Package Price: $4.99
    Free Shipping
    M6-1.0 X 16mm Black Zinc Phillips Pan Head Metric Machine Screws M6-1.0 X 16mm Black Zinc Phillips Pan Head Metric Machine Screws

  • 6mm-1.00 x 16mm
  • Phillips Pan Head Metric Machine Screws
  • Black Zinc
  • Class 4.8
  • Head Width: 12mm
  • Head Height: 4.6mm
  • DIN 7985 / ISO 7045
  • 25 Per Package

  • Package Price: $4.99
    Free Shipping
    25 M 6-1.0 x 10 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 25 M 6-1.0 x 10 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 6
  • Thread Pitch: 1.0
  • Length: 10mm
  • Head Diameter: 10.5mm
  • Head Height: 3.9mm
  • Drive Size: # 3
  • Thread Length: Full Thread
  • 25 Per Package
  • Package Price: $5.13
    Free Shipping
    25 M 6-1.0 x 12 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 25 M 6-1.0 x 12 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 6
  • Thread Pitch: 1.0
  • Length: 12mm
  • Head Diameter: 10.5mm
  • Head Height: 3.9mm
  • Drive Size: # 3
  • Thread Length: Full Thread
  • 25 Per Package
  • Package Price: $5.13
    Free Shipping
    25 M 6-1.0 x 16 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 25 M 6-1.0 x 16 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 6
  • Thread Pitch: 1.0
  • Length: 16mm
  • Head Diameter: 10.5mm
  • Head Height: 3.9mm
  • Drive Size: # 3
  • Thread Length: Full Thread
  • 25 Per Package
  • Package Price: $5.18
    Free Shipping
    6-32 X 3/4 Phillips Pan Head M.S. Zinc 6-32 X 3/4" Phillips Pan Head Machine Screws Zinc

  • #6-32 x 3/4"
  • Phillips Pan Head Machine Screws
  • Zinc
  • 100 Per Package

  • View Catalog Page

    Package Price: $5.19
    Free Shipping
    6-32 X 1/2 Slotted Round Hd Machine Screw Zinc 6-32 X 1/2" Slotted Round Head Machine Screw Zinc Chromate Finish

  • Slotted Round Head Machine Screws
  • Bright Zinc Chromate Finish
  • Size: 6-32 x 1/2"
  • 100 Per Package

  • View Catalog Page

    Package Price: $5.29
    Free Shipping
    8-32 X 3/4 Phillips Pan Head M.S. Zinc 8-32 X 3/4" Phillips Pan Head Machine Screws Zinc

  • #8-32 x 3/4"
  • Phillips Pan Head Machine Screws
  • Zinc
  • 100 Per Package

  • View Catalog Page

    Package Price: $5.29
    Free Shipping
    25 M 5-0.8 x 30 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 25 M 5-0.8 x 30 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 5
  • Thread Pitch: 0.8
  • Length: 30mm
  • Head Diameter: 9mm
  • Head Height: 3.3mm
  • Drive Size: # 2
  • Thread Length: Full Thread
  • 25 Per Package
  • Package Price: $5.31
    Free Shipping
    25 M 6-1.0 x 8 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 25 M 6-1.0 x 8 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 6
  • Thread Pitch: 1.0
  • Length: 8mm
  • Head Diameter: 10.5mm
  • Head Height: 3.9mm
  • Drive Size: # 3
  • Thread Length: Full Thread
  • 25 Per Package
  • Package Price: $5.31
    Free Shipping
    10 M 5-0.8 x 60 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 10 M 5-0.8 x 60 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 5
  • Thread Pitch: 0.8
  • Length: 60mm
  • Head Diameter: 9mm
  • Head Height: 3.3mm
  • Drive Size: # 2
  • Thread Length: Full Thread
  • 10 Per Package
  • Package Price: $5.40
    Free Shipping
    25 M 5-0.8 x 35 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111 25 M 5-0.8 x 35 Small Head Philips Pan Machine Screw, Steel Zinc. JIS B 1111

  • Small Head Philips Pan Machine Screws
  • Zinc Plated
  • JIS B 1111
  • Diameter: M 5
  • Thread Pitch: 0.8
  • Length: 35mm
  • Head Diameter: 9mm
  • Head Height: 3.3mm
  • Drive Size: # 2
  • Thread Length: Full Thread
  • 25 Per Package
  • Package Price: $5.46
    Free Shipping
    M4 - 0.7 x 8mm  Phillips / Hex Head SEMS Screw, Class 8.8 M4 - 0.7 x 8mm Phillips Hex Head SEMS Screw Class 8.8

    Phillips Indented Hexagon Head Machine Screw Sems with Split Lock Washer and Flat Washer.

  • Yellow Zinc
  • Class 8.8
  • JIS B 1187
  • Diameter: M4
  • Thread Pitch: 0.7
  • Length: 8mm
  • Head Height: 2.8mm
  • Hex Width: 7mm
  • Drive Size: #2
  • Washer Diameter: 9mm
  • Fully Threaded
  • 25 Per Package
  • Package Price: $5.49
    Free Shipping
    M4 - 0.7 x 12mm  Phillips / Hex Head SEMS Screw, Class 8.8 M4 - 0.7 x 12mm Phillips Hex Head SEMS Screw Class 8.8

    Phillips Indented Hexagon Head Machine Screw Sems with Split Lock Washer and Flat Washer.

  • Yellow Zinc
  • Class 8.8
  • JIS B 1187
  • Diameter: M4
  • Thread Pitch: 0.7
  • Length: 12mm
  • Head Height: 2.8mm
  • Hex Width: 7mm
  • Drive Size: #2
  • Washer Diameter: 9mm
  • Fully Threaded
  • 25 Per Package
  • Package Price: $5.49
    Free Shipping
    10-24 X 3/8 Phillips Pan Head M.S. Zinc 10-24 X 3/8" Phillips Pan Head Machine Screws Zinc

  • #10-24 x 3/8"
  • Phillips Pan Head Machine Screws
  • Zinc
  • 100 Per Package

  • View Catalog Page

    Package Price: $5.53
    Free Shipping
       
     

    Machine screws are uniformly threaded and intended to fit into uniformly threaded holes or nuts. Usually used to fasten components together in machines, appliances, tools and electronic devices, machine screws come in a number of materials, lengths, diameters, configurations and driver head styles. We carry a wide selection of machine bolts to make it easy for you to find just the right one. Flat head machine screws, for example, are the right choice when you need it to be flush with the surrounding surface. A pan head machine screw offers a rounded head that sits above the surface, higher than that of a truss screw. Our inventory includes an assortment of material and finish types, including steel zinc, yellow zinc, zinc-plated, bright zinc chromate and stainless steel machine screws. Some come with washers included. You can find small machine screws quite easily when you browse through Clips and Fasteners' extensive machine screw catalog.