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38-430 Caps

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Cap Neck Finish Guide

These 38mm caps and closures are designed specifically for bottles, jars and containers with a 38-430 thread finish.

Caps and closures are measured using two numbers in the format of 38-430 or 38/430: 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 38mm caps will fit a 38mm opening, due to the differences in thread types between manufacturers.

  • 38-430 Black Ribbed PP Cap, Unlined, Each
    Part #: QP-CAP-00378-EA

    $0.40
  • Replacement Screw Caps for 38-430 ECO Funnels
    Part #: EF-38-430-SCREWCAP

    $17.00 $14.30
  • 38-430 Black Phenolic Cap with PTFE /Rubber Liner, Each
    Part #: QP-CAP-00241-EA

    $6.00 $5.50
  • Nalgene® 342178-0384 Septum Caps, 38-430, Sterile, case/240
    Part #: NG-342178-0384

    $698.00 $585.80
  • WHEATON® 38-430 Starline PP Caps, case/72
    Part #: WH-239516

    $65.00 $59.83
  • 38mm PTFE 0.010" Disc (Packed in bags of 100), case/500
    Part #: QP-CAP-00524

    $437.00 $377.30
  • 7-Port Cap/ Filling Cap for Nalgene® 38-430 thread, Complete Kit
    Part #: WF-38-7KIT

    $214.00 $184.50
  • WHEATON® 38-430 Black Phenolic Caps, Foil Liner, case/200
    Part #: WH-240381

    $272.00 $234.90
  • WHEATON® 38-430 Black Phenolic Caps, Poly Liner, case/200
    Part #: WH-240081

    $259.00 $223.40