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MIL-DTL-38999 Dust Cap

MIL-DTL-38999 Dust Caps and Protective Covers

Read More »
10.07.2026
MIL-DTL-38999 vs MIL-DTL-5015

MIL-DTL-38999 vs MIL-DTL-5015: A Complete Circular Connector Comparison Guide

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09.07.2026
MIL-DTL-38999 Series III Backshell

MIL-DTL-38999 Series III Backshell: Complete Guide & Applications

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09.06.2026
MIL-DTL-83513 Connector

MIL-DTL-83513: Ultimate Guide to Micro-D Connectors and Specifications

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09.06.2026
MIL-DTL-26482

MIL-DTL-26482: Specifications, Series Comparison, and Selection Guide

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09.06.2026
Communications

MIL-Spec Connectors: The Complete Guide to Military Circular Connectors, Standards, Applications and Selection

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09.06.2026
J30J-15ZKP

J30J-15ZKP: Comprehensive Guide to Micro-D Connectors and Applications

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09.06.2026
MIL-DTL-5015

MIL-DTL-5015 Series: A Comprehensive Guide to Connectors and Specifications

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09.06.2026
MIL-DTL-38999-Series-I-Connectors

Electroless Nickel Plating: Processes, Properties, and Applications

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24.05.2026
D3899920KF11PN

Stainless Steel Passivated: Processes, Standards, and Applications

Read More »
24.05.2026
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Table of Contents

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  • What Is a MIL-DTL-38999 Dust Cap?
  • Why Do Unmated MIL-DTL-38999 Connectors Need Protective Covers?
    • Protection Against Dust and Contamination
    • Protection Against Moisture
    • Protection Against Mechanical Damage
    • Protection of Coupling Interfaces
  • MIL-DTL-38999 Dust Cap Types by Series
    • MIL-DTL-38999 Series I Dust Caps
    • MIL-DTL-38999 Series II Dust Caps
    • MIL-DTL-38999 Series III Dust Caps
    • MIL-DTL-38999 Series IV Dust Caps
  • Plug Covers vs Receptacle Covers
    • Plug Protective Cover
    • Receptacle Protective Cover
  • Common MIL-DTL-38999 Protective Cover Part Numbers
    • MS27501
    • MS27502
    • MS27510
    • MS27511
    • D38999/32
    • D38999/33
    • D38999/51
    • D38999/52
  • Materials and Finishes
    • Aluminum Alloy
    • Electroless Nickel
    • Cadmium-Based Finishes
    • Stainless Steel or Corrosion-Resistant Steel
    • Composite Materials
    • Match the Cover to the Application, Not Just the Color
  • Should the Dust Cap Finish Match the Connector?
  • Chain, Rope, Ring, and Lanyard Options
    • No Attachment
    • Chain Attachment
    • Chain with Ring
    • Rope or Flexible Retention
    • Attachment Length
  • How to Select the Correct MIL-DTL-38999 Dust Cap
    • Step 1: Identify the Connector Series
    • Step 2: Identify the Connector Half
    • Step 3: Confirm the Shell Size
    • Step 4: Select the Material and Finish
    • Step 5: Choose the Attachment Method
    • Step 6: Check Attachment Length
    • Step 7: Review the Operating Environment
    • Step 8: Confirm Documentation Requirements
  • Does Insert Arrangement Matter When Selecting a Dust Cap?
  • How to Read a MIL-DTL-38999 Protective Cover Part Number
    • MIL-DTL-38999 Series I Protective Cover Part Number
    • MIL-DTL-38999 Series II Protective Cover Part Number
    • MIL-DTL-38999 Series III Protective Cover Part Number
  • Dust Caps vs Backshells, Sealing Plugs, and Protective Boots
    • Dust Cap or Protective Cover
    • Backshell
    • Sealing Plug
    • Strain Relief Boot
    • Dummy Stowage Receptacle
  • Typical Applications
    • Aircraft and Aerospace Systems
    • Communication and Electronic Equipment
    • Rail and Transportation Equipment
    • Marine and Offshore Equipment
    • Industrial Automation
    • Test and Measurement Systems
    • Ground Support Equipment
  • Installation and Maintenance
    • Inspect the Connector First
    • Inspect the Gasket or Sealing Element
    • Fully Engage the Cover
    • Inspect the Chain or Retention Device
    • Keep the Inside of the Cover Clean
  • Common MIL-DTL-38999 Dust Cap Selection Mistakes
    • Mistake 1: Choosing by Diameter Only
    • Mistake 2: Confusing Plug and Receptacle Covers
    • Mistake 3: Ignoring Shell Size
    • Mistake 4: Selecting by Color
    • Mistake 5: Forgetting the Attachment Requirement
    • Mistake 6: Ignoring Chain Length
    • Mistake 7: Assuming All Compatible Parts Have the Same Compliance Status
    • Mistake 8: Treating a Dust Cap as a Backshell
  • Information to Provide When Requesting a Quote
  • Why Choose AVIA for MIL-DTL-38999 Protective Covers?
  • Frequently Asked Questions
    • What is the difference between a dust cap and a protective cover?
    • Are MIL-DTL-38999 dust caps required?
    • Which protective cover fits a D38999/20 receptacle?
    • Which protective cover fits a D38999/26 plug?
    • Can a Series I dust cap fit a Series II connector?
    • Does the insert arrangement affect dust cap selection?
    • Should the dust cap finish match the connector finish?
    • Are MIL-DTL-38999 dust caps waterproof?
    • Can one dust cap fit multiple MIL-DTL-38999 series?
    • Do protective covers come with chains?
    • How do I find the correct dust cap for an unknown connector?
  • Related Guides​
    • Related Connector Standards
    • Comparison Guides
  • Related Guides
→ Index
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