20mm Caps

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Cap Neck Finish Guide

20mm caps and closures include 20mm Snap Seals for glass autosampler vials, 20mm aluminum seals, and both 20-400 and 20-415 thread finishes.

Caps and closures are measured using two numbers in the format of 20-400 or 20/400: the first number is the distance in millimeters from outer thread to outer thread when looking at the top of the container; the second is a reference to the design of the threads themselves. Review the image to the right in order to understand thread design, to assist you in selecting the correct cap for your bottle or container. Carefully review your container's threads before selecting a cap even if you know the first measurement; not all 20mm caps will fit a 20mm opening, due to the differences in thread types between manufacturers.

  • 20-400 unlined Hole Cap
    Part #: QP-CAP-00330-EA

    $0.29 $0.23
  • 20-400 Bottle Cap, Vinyl Lined
    Part #: QP-CAP-00147-EA

    $0.19 $0.16
  • 20-400 Black Bottle Cap, 14B Rubber Lined, Autoclavable
    Part #: QP-CAP-00474-EA

    $0.41 $0.32
  • 20-400 Green Thermoset Screw Caps, F217 & PTFE Liner, Each
    Part #: QP-272492

    $0.95 $0.79
  • WHEATON® 20-400 I-Loc Caps, PP Black, case/100
    Part #: WH-240676-01

    $65.00 $51.77
  • Nalgene 24-415 Septum Caps, Sterile, case/200
    Part #: NG-342178-0240

    $581.00 $450.18
  • 20-400 Ribbed Bottle Cap, Cone Lined
    Part #: QP-CAP-00143-EA

    $0.35 $0.28
  • Nalgene Amber PP Caps, 20-415, 12mm x 22mm, case/2000
    Part #: NG-362150-7200

    $593.00 $459.36
  • Nalgene Blue PP Caps, 20-415, 12mm x 22mm, case/2000
    Part #: NG-362150-6200

    $593.00 $459.36
  • Nalgene Green PP Caps, 12mm x 22mm, case/2000
    Part #: NG-362150-4200

    $593.00 $459.36