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Grease Fittings

A grease fitting, grease Zerk fitting, or Alemite fitting is a metal fitting used in mechanical systems to feed lubricants, usually a lubricating grease, into a bearing under moderate to high pressure using a grease gun. We offer many vaieties of grease fittings avaiable from stock. Contact us for a quote.

How To Identify Grease Fitting Threads.
Grease fittings come in many different styles. There are two grease fittings that are very common. These are the 1/4″-28 thread and the 1/8″ NPT thread. However, there are other less common grease fitting threads in use. Here are some ways to identify the threads on your grease fittings.

Grease Fitting Gauge.
The easiest way to identify the thread on a grease fitting is to use a tool made specifically for this purpose, known as a Grease fitting thread gauges. Although convenient, you can identify your grease fitting thread without spending the money on this specialty tool.

Steps you may use without a grease fitting gauge.
To determine which grease fitting thread you have take three separate measurements and finding your thread on the chart below.



Straight or Tapered?
The first step in determining a grease fitting’s thread is to determine if the thread is straight or tapered. This is done by a visual check. Look carefully, a tapered thread is only tapered by about 3 degrees and is easy to miss if you aren’t careful.

Thread Pitch
A thread pitch gauge is the ideal. However, you can also compare the grease fitting threads to a known bolt thread, pipe thread, or another grease fitting. Place the known thread against the unknown thread. If the two threads engage, the thread is the same. If they do not, the thread is different.

Thread Diameter
The last measurement you need is the outer or major diameter of the thread. A set of calipers makes this an easy measurement to take.

American National Pipe Thread Code

PFP SAE short taper pipe thread
NPTF American National taper pipe thread for Dry-seal pressure-tight joints
NPSI American National straight intermediate pipe thread
NPSM American National straight pipe thread for mechanical joints
  • Straight

  • 45 Degree

  • 90 Degree

Grease Fittings SPECIFICATIONS

Button Head Fittings

1/8" PTF Fittings

Part Number

Style

Hex

Overall

Shank

1644

Straight

7/16

9/16

15/64

1610

Straight

7/16

11/16

19/64

1607

Straight

7/16

1-1/4

25/32

1669

Straight

7/16

1-3/4

1-17/64

1684

Straight

3/8

2-5/8

2-3/16

1618

Straight

1/2

1

9/32

1958

Straight

7/16

31/32

1/4

1611

30

7/16

29/32

19/64

1638

30

7/16

2-3/32

1-1/4

1688

45

7/16

57/64

1620

45

7/16

1-1/8

1612

65

7/16

27/32

1623

65

7/16

1-7/32

1649

65

3/8

2-3/4

1613

90

7/16

27/32

1606

90

7/16

1-13/16

369599

Straight

7/16

2-5/8

369608

65

7/16

29/32

36957

Double 70

1/2

27/32

1/8" PTF Fittings are used on industrial machines and heavy equipment

1/4-28" Taper Thread Fittings

Part Number

Style

Hex

Overall

Shank

1641

Straight

5/16

35/64

3/16

1652

Straight

5/16

11/16

23/64

1680

Straight

5/16

31/32

5/8

1698

Straight

5/16

1-1/8

25/32

3014

Straight

5/16

1-5/8

1

1637

45°

3/8

13/16

13/64

3010

65°

3/8

25/32

19/64

1911

90°

3/8

3/4

13/64

1/4"-28 Taper Thread Fittings are used on most cars and trucks, as well as many industrial machines. It is recommended that SAE-LT taper threads be assembled into 1/4"-28 UNF, Class 3B, straight threaded holes having a modified maximum minor diameter of 0.2151", to ensure 75% minimum thread height

Button Head Fittings

Part Number

Thread

Hex

Overall

Shank

A1184

1/8 PTF

5/8

3/4

11/32

A1186

1/4 NPTF

5/8

53/64

27/64

A1188

3/8 NPTF

3/4

61/64

31/64

A1190

1/2 NPTF

7/8

1-1/16

35/64

C69

1/8 NPTF

5/8

31/32

13/32

M1184

1/8 PTF

5/8

3/4

11/32

1823

1/4 NPTF

7/8

1-1/4

1/2

1822

3/8 NPTF

7/8

1-5/16

9/16

1820

1/2 NPTF

7/8

1-1/16

1/2

Standard Button Head Fittings are used in rugged applications such as heavy machinery, construction equipment and off road equipment.

1/8 PTF Stainless Fittings

Part Number

Style

Hex

Overall

Shank

1961S

Straight

7/16

.62

.25

1921S

30

7/16

1.25

.34

1922S

67.5

7/16

.95

.34

1923S

90

7/16

.82

.27

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Disclaimer

All the information provided in this section has been assembled with concern for accuracy. It is intended for advisory purposes only and use of this information is completely voluntary.