38-400 Caps

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Cap Neck Finish Guide

38mm caps and closures are designed specifically for bottles, jars and containers with a 38-400 thread finish.

Caps and closures are measured using two numbers in the format of 38-400 or 38/400: 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.

  • 38-400 Black Phenolic Ribbed Bottle Cap, Cone Lined
    Part #: QP-CAP-00224-EA

    $0.61 $0.47
  • 38-400 White Ribbed Cap, Foam Lined
    Part #: QP-CAP-00369-EA

    $0.16 $0.13
  • 38-400 White Metal Cap, Pulp Polyethylene Lined
    Part #: QP-CAP-00440-EA

    $0.33 $0.26
  • 38-400 Black Phenolic Bottle Cap, Solid Polyethylene Lined
    Part #: QP-CAP-00228-EA

    $0.51 $0.40
  • 38-400 White Metal Cap, Plastisol Lined
    Part #: QP-CAP-00441-EA

    $0.35 $0.28
  • 38-400 Green Thermoset Screw Caps, F217 & PTFE Liner, Each
    Part #: QP-CAP-00561-EA

    $1.25 $0.97
  • WHEATON® 38-400 PP Caps, White, Poly Vinyl Liner, case/72
    Part #: WH-239213

    $26.00 $20.96
  • 38-400 Black Ribbed Polypropylene unlined Cap
    Part #: QP-CAP-00367-EA

    $0.14 $0.11
  • 38-400 White Ribbed Polypropylene unlined Cap
    Part #: QP-CAP-00366-EA

    $0.14 $0.11
  • Spigot Closure, 38mm Quick Serve Tap for Cubitainers, each
    Part #: QP-PLA-03193-EA

    $8.00 $6.38
  • WHEATON® 38-400 PP Caps, White, Foamed Poly Liner, case/72
    Part #: WH-239285

    $27.00 $21.30
  • 38-400 Black Phenolic Bottle Cap, Aluminum Foil Liner
    Part #: QP-CAP-00227-EA

    $0.49 $0.38
  • 38-400 Black Phenolic Bottle Cap, Vinyl Lined
    Part #: QP-CAP-00230-EA

    $0.43 $0.34
  • 38-400 Green Thermoset Caps, F217 & PTFE Liner, case/500
    Part #: QP-CAP-00562

    $648.00 $537.56