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Fittings, push lock and compression as used in centralized, automated lubrication systems, ranging from 4nn (5/32) to 10mm tube OD applications. Materials: brass and steel.

Olives, inserts & crimp nuts Straight compression & push lock Elbow compression & push lock Unions (repair) couplings
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Bulkhead compression Stud elbow - Cube adapters Hose end fittings Adapters (incl. JIC)

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Air fittings and adapters T-couplings Swivel couplings Grease fittings
Greaseable clevis pins
Several lubrication system brands in the marketplace use secondary tubing in the size of: 5/32", 4mm, 3/16", 5mm, 1/4" or 6mm. Lubecore uses 5mm OD nylon secondary tubing which in the market is sometimes referred to 3/16 because of its close proximity. However this is not to be confused with manufacturers using tubing which is exactly 3/16".
As a rule of thumb:
5mm compression fittings will compress sufficiently on 3/16" OD tubing. 3/16" OD fittings may be an extreme tight fit on 5mm tubing. Its recommended to avoid interchanging push-lock style fittings as a correct seal may not be achieved.
It is our experience that:
5/32" (3.96875mm) tube OD to 4mm compression fittings are interchangeable.
3/16" (4.7625mm) tube OD to 5mm compression fittings are interchangeable.
1/4" (6.35nn) tube OD to 6mm compression fittings are NOT interchangeable.

Note: Although this site differentiates between brass and steel fittings. Some steel fittings (up to 100 bar compression rating) are often used for nylon/plastic/PA tubing in lubrication systems. Higher pressure rated fittings (250bar or higher) may require inserts for tubing to crimp sufficiently.

Cannot find the appropriate thread in a 5mm compression fitting? Use olive/ferrule 20211 to adapt a 6mm to a 5mm compression fitting. (20211 is a brass adaptation ferrule for nylon tubing only)

BSP: 55 degree thread flank
NPTL 60 degree thread flank

BSP distinguishes between two types of threads. These are parallel threads (BSPP), which have a constant diameter, which are known a G threads, and taper threads (BSPT), whose diameter increases or decreases along the length of the thread, known as R threads.