Caplugs Caps, Plugs & Cross-Reference Parts

Caplugs, founded in 1948 and headquartered in Buffalo, New York, designs and molds protective caps, plugs, and masking products for industrial use. The company has been part of the Berwind Corporation portfolio since 2015 and remains active, with a catalog of more than 50,000 standard parts plus custom-molded components spanning protective caps and plugs, tubing, netting, containers, hose guards, spiral wrap, and the Shercon masking line. Northern Hydraulics supplies Caplugs protective caps, plugs, and masking parts for hydraulics applications and cross-references discontinued or specialized Caplugs part numbers to current equivalents.

Cross-Referencing Caplugs Parts

Most procurement questions on Caplugs hardware come down to one thing: which current part replaces an older or discontinued number. Caplugs holds backward compatibility across its hydraulics families, but several references have been superseded. The NAS831-10 threaded cap is discontinued and replaced by the EC-10. The military masking references MS90376 and AS90376 were both superseded by the SAE AS 85049/138 specification. If you have a Caplugs cap or plug that no longer appears in a current catalog, we match it to the active equivalent so the thread size, fitting profile, and material carry over.

We cross-reference by series prefix and size across the CD, PD, EC, T, SC, and VC families, and we handle obsolete or specialized references on the MIL/NAS side as well. Send the legacy Caplugs part number, the fitting it protects, and the quantity, and we return the current replacement and equivalent parts. To match a discontinued or specialized Caplugs part number, request a Caplugs cross-reference quote.

Caplugs Product Lines & Series

Caplugs organizes its hydraulics and general-protection hardware into series families, each tied to a fitting type, thread standard, or material:

• CD Series – threaded caps for flared JIC fittings
• PD Series – threaded plugs for flared JIC fittings
• EC Series – threaded connector caps (current replacement for NAS831 references)
• T Series – tapered caps and plugs
• SC Series – sleeve caps for tube ends; SC-SH Series Ultrabake high-temperature caps
• VC Series – round vinyl caps
• MJ Series – pull-tab caps
• BSP Series – threaded plugs to British Standard Pipe thread
• PTSP Series – service plugs
• ASC / ASP / EP Series – MIL/NAS-compliant caps and plugs
• TE Series – tube end plugs
• VRR / VRF / VOR Series – LoVen vinyl products
• Shercon masking products – high-temperature masking caps, plugs, and tape for coating and plating

If you need to confirm which series and size matches your fitting, send the dimensions and we will identify the part.