Double headed fittings allow alternative or simultaneous greasing by means of two heads. They are made of zinc-plated steel and include a ball check to keep out dirt and debris.
1/4"-28 Taper Thread Fittings
Taper Thread Grease Fittings are used on cars, trucks and many types of industrial machinery. It is recommended that SAE-LT taper threads (Society of Automotive Engineers Lubrication Threads) be installed into straight holes with a 1/4''-28 UNF-3B straight-threaded hole.
Thread Forming Grease Fittings
Thread Forming Grease Fittings, a.k.a. "spin drive grease fittings" are used to save tapping cost and have special tapered drive threads that reshape the material in an untapped hole to provide a leak proof seal.
Stainless Steel Grease Fittings
Stainless Steel Grease Fittings are comprised of Type 303 stainless for fitting bodies, Type 440 stainless for balls and Type 302 stainless for tempered springs.
Leak Proof Grease Fittings
Leak proof Grease Fittings are a special purpose fitting for use in applications where a positive seal is essential.
Pressure Relief Grease Fittings
Pressure Relief Grease Fittings are commonly used on gear box housings and bearings such as king pins, universal joints, etc. where excessive lubricant pressures are not desirable.
Special Thread Grease Fittings
Special thread grease fittings are designed to fit into corresponding straight threaded holes and are available with special threads and sizes for special lubrication requirements.
Button Head Grease Fittings
Ball Type Grease Fittings
Brass Grease Fittings
Flush Type Grease Fittings
Grease fittings are permanently installed by a threaded connection, leaving a nipple connection that a grease gun attaches to. The pressure supplied by the grease gun forces a small captive bearing ball in the fitting to move back against the force of its retaining spring. The arrangement is thus essentially a valve that opens under pressure to allow lubricant to pass through a channel and be forced into the voids of the bearing. When the pressure ceases, the ball returns to its closed position. The ball excludes dirt and functions as a check valve to prevent grease escaping back out of the fitting. The ball is almost flush with the surface of the fitting so that it can be wiped clean to reduce the amount of debris carried with the grease into the bearing. The convex shape of the fitting allows the concave tip of the grease gun to seal against the fitting easily from many angles, yet with a sufficiently tight seal to force the pressured grease to move the ball and enter the fitting, rather than simply oozing past this temporary annular (ring-shaped) seal. Grease fittings are commonly made from zinc-plated steel, stainless steel, or brass.