Grease Fittings Sizes
A grease fitting or Zerk fitting is a lubrication fitting used in mechanical systems to add grease with a grease gun. The fitting is installed by a pipe thread connection leaving a nipple connection the grease gun attaches to. A spring-loaded steel ball is fitted to the internal side of the nipple inlet to exclude dirt intrusion and function as a shutoff valve to prevent grease escaping back out of the nipple. The ball is almost flush with the surface of the nipple so it can be wiped clean. Grease fittings are rarely found on consumer goods, appliances, or modern cars. They are commonly used on industrial equipment. Zerk fittings, also sometimes called Alemite fittings, are commonly found on marine engines. Besides providing fresh lubrication, pumping grease into a Zerk fitting on a boat motor or lower unit expels moisture that would otherwise cause corrosion. Oscar Zerk patented the Zerk fitting in January 1929
| 1/8"-PTF GREASE FITTINGS | | Description | FIG | A | B | X | Alemite # | Lincoln # | | 1/8"-PTF STRAIGHT SHORT | 1 | 9/16" | 15/64" | 7/16" | 1644-B | N/A | | 1/8"-PTF STRAIGHT | 1 | 21/32" | 1/4" | 7/16" | 1610-BL | 5000 | | 1/8"-PTF STRAIGHT WITH CAP | 1 | 25/32" | 9/32" | 9/16" | N/A | N/A | | 1/8"-PTF STRAIGHT, NO BALL | 1 | 21/32" | 1/4" | 7/16" | N/A | N/A | | 1/8"-PTF MEDIUM LONG | 4 | 1-1/4" | 25/32" | 7/16" | 1607-B | 5003 | | 1/8"-PTF LONG | 4 | 1-3/4" | 1-15/64" | 7/16" | 1669-B | 5007 | | 1/8"-PTF VERY LONG | 4 | 2-5/8" | 2-1/32" | 7/16" | 1684-B | 5009 | | 1/8"-PTF LONG THREAD | 4 | 3/4" | 11/32" | 7/16" | N/A | N/A | | 1/8"-NPTF INTERNAL THREAD | N/A | 1" | 5/16" | 1/2" | 1618-B | 5505 | | 1/8"-PTF STR. DUSTPROOF | N/A | 1" | 5/16" | 7/16" | 1958 | N/A | | 1/8"-PTF 30 DEGREE | 2 | 15/16" | 19/64" | 7/16" | 1611-B | 6004 | | 1/8"-PTF 30° MED.LONG | 2 | 2" | 1-1/4" | 7/16" | 1638-B | 5200 | | 1/8"-PTF 45 DEGREE | 2 | 27/32" | 19/64" | 7/16" | 1688-B | 5200 | | 1/8"-NPTF 45° FEMALE THRD | N/A | 1-1/8" | 13/32" | 7/16" | 1620-B | N/A | | 1/8"-PTF 65 DEGREE | 2 | 27/32" | 19/64" | 7/16" | 1612-B | 5300 | | 1/8"-PTF 65° MED. LONG | 2 | 1-7/32" | 9/16" | 7/16" | 1623-B | N/A | | 1/8"-PTF 65° VERY LONG | 2 | 2-3/4" | 2-1/4" | 3/8" | 1649 | N/A | | 1/8"-PTF 90 DEGREE | 3 | 53/64" | 19/64" | 7/16" | 1613-B | 5400 |
| 1/4"-28 TAPER THREAD GREASE FITTINGS | | Grease Fitting Description | FIG | A | B | X | Alemite # | Lincoln # | | 1/4"-28 SAE STRAIGHT | 1 | 35/64" | 3/16" | 5/16" | 1641-B | 5010 | | 1/4"-28 SAE LONG THREAD | 4 | 11/16" | 23/64" | 5/16" | 1652-B | 5013 | | 1/4"-28 SAE MEDIUM LONG | 4 | 31/32" | 5/8" | 5/16" | 1680-B | 5014 | | 1/4"-28 SAE LONG | 4 | 1-1/8" | 25/32" | 5/16" | 1698-B | 5017 | | 1/4"-28 STRAIGHT VERY LONG | 4 | 1-5/8" | 1" | 5/16" | 3014-B | N/A | | 1/4"-28 SAE 45 DEGREE | 2 | 27/32" | 7/32" | 3/8" | 1637-B1 | 5210 | | 1/4"-28 SAE 65 DEGREE | 2 | 3/4" | 7/32" | 3/8" | N/A | 5311 | | 1/4"-28 65° LONG THREAD | 2 | 13/16" | 19/64" | 3/8" | 3010-B1 | 700396 |
Pipe Thread Tap Drill Chart
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