End caps and plugs are the cheapest insurance in a workshop. They protect threads, seal pipe ends and keep dirt out of fittings during storage and transport — for pennies per piece.
Common uses
- 1Protecting threads on bolts, studs and pipe fittings during shipping
- 2Sealing the ends of hydraulic hoses and brake lines during storage
- 3Masking machined surfaces, ports and bores during painting or blasting
- 4Capping unused ports on manifolds, tanks and test rigs
Advantages
- Very low cost — sold in bulk packs of hundreds
- Available in plastic (LDPE, vinyl) or rubber for different needs
- Fits a wide range of metric and imperial sizes
- Reusable in many cases — pull off, store, use again
Disadvantages
- Not pressure-rated — they're for protection, not live sealing
- Plastic caps can become brittle in UV or extreme heat
- Easy to lose during a job — keep a labelled bin near the bench
- Won't replace a proper threaded plug on a live hydraulic port
The bottom line
Treat end caps as standard issue, not an afterthought. A 50-fils cap on a stored hose fitting prevents a 500 AED contamination problem later.
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