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What Temperature can a grease nipple withstand?

Possible problems associated with high temperatures are;

  • Plating: Parts are zinc plated and passivated with a yellow chromate film.  Zinc has a melting point of 420° C. The yellow chromate plating provides a self healing film. At elevated temperatures, >150°C,  the film starts to dry out and cracks, reducing the corrosion resistance but this is irrelevant if the base zinc has melted.
  • The body of the fitting is steel and should be ok at elevated temperatures, although if any chemical atmosphere is present, it may be detrimental and could possibly affect the corrosion resistance and case hardness.
  • The spring is stress relieved by us at about 450°C but only for a few moments. We cannot say if prolonged changes in temperature will be detrimental to the effectiveness of the spring especially if any other chemical atmosphere is involved.

What is a BP1?

  • A BP1 is the standard box used by Kingfisher.  It contains grease nipples and is sealed and clearly labelled for shipment.  There are 8 BP1s in one Export Carton.
  • Click on this packing link to see more details


What is grease viscocity?

The ability of any particular grease to be handled by grease pumps, grease dispensers, and other components in a automated greasing system depends on the grease viscosity (thickness). Grease is a mixture consisting of a natural or synthetic oil base combined with thickeners and additives. Grease viscosity depends on the amount and type of thickener(s) used as well as the viscosity of the base oil. The NLGI (National Grease Lubricating Institute) has established a scale of 000 to 6 representing very low to very high viscosity.

What does NLGI mean?

NLGI refers to the"“National Lubricating Grease Institute". This US industry body is chartered to develop and maintain standards for the grease industry. Their numbers range from 6 block grease to 000 very thin runny grease. NLGI 2 is a general all prupose viscocity of grease used in many applications.

NLGI Grade            Classification   Consisitency                            

      000                       445 - 475          Semifluid 
       00                        400 - 430          Semifluid 
         0                        355 - 385          Very Soft 
         1                        310 - 340          Soft 
         2                        265 - 295          Common Grease 
         3                        220 - 250          SemiHard 
         4                        175 - 205          Hard
         5                        130 - 160          Very Hard
         6                         85 - 115           Solid

The worked penetration values in the table are determined by the ASTM (American Society for Testing and Materials) testing methods. ASTM D 217 and D1403 are described as "Standard Test Methods for Cone Penetration of Lubricating Grease". To measure penetration, a cone of given material, weight, and finish is allowed to sink into a grease for 5 seconds at a standard temperature of 25°C (77°F). The depth, in tenths of a millimeter, to which the cone sinks into the grease is the penetration.

How do you measure case hardness?

Kingfisher steel hydraulic grease fittings are carbo nitride case hardened to meet the relevant grease fitting standards.

Surface hardness is measured using the appropriate hardness tester and is taken perpendicular to the surface of the fitting in the absence of any zinc plating.

Case depth is the measurement of TOTAL CASE DEPTH. This is the measurement from the surface to a depth where the material becomes indistinguishable from the core material. Across this layer the micro hardness will reduce and visible structure will change to a point where it becomes the same as the core material.

Effective case depth is not a suitable measurement for thin case carbo nitriding.

Why case-harden grease fittings?

Kingfisher steel hydraulic grease fittings are carbo nitride case hardened to meet the relevant grease fitting standards. Hydraulic grease fittings are case hardened to withstand the hardened steel jaws of the grease coupler which can exert large forces under high pressure. It also gives some protection against any abrasion the fitting maybe subject to in the field.

Stainless Steel

Stainless steel is the alloy result of adding nickel, chromium and other elements to iron. These elements inhibit corrosion from occurring to the metal, and make stainless steel a useful material
The 300 stainless steels have approximately 18 percent chromium and 8 percent nickel added. This makes it also known as 18-8 stainless steel. The 300 series has the best corrosion resistance of the different stainless steel grades. These different alloy variations affect corrosion resistance and ability to manufacture. This allows use of the 300 series for a variety of commercial applications.


303 Stainless

Type 303 is similar to both 304 and 316 grades of stainless steel. Its corrosion resistance is similar to 304 but not as resistant as type 316. Mechanical properties are similar, but the higher sulphur content in the 303 alloy allows easier machining of this grade than both 304 and 316.

Product that requires volume machining of large quantities to be produced at high quality and most  efficiently make type 303 a good choice.

303 is used in the manufacture of grease fittings, shafts, gears, threaded uses, aircraft fittings and bushings.


316 Stainless

This type of stainless steel has 16 to 18 percent chromium and 11 to 14 percent nickel and a minimum of 2 percent molybdenum. Molybdenum gives 316 additional resistance to corrosion making it useful in chemically hostile conditions. Uses for this grade of stainless steel is in the more corrosive conditions such as food processing, chemical processing, agricultural uses and the pulp and paper industry


Why no ball and spring?

The ball and spring prevent the ingress of dirt and other debris into the fitting.  There are low pressure applications when this is not a factor.  Particulalry if oil is used.  

Resin, concrete repairs and wood preservative application can demand a different configuration. Resins set quite quickly and often require that the flow is merely slowed down to reduce the seepage after injection to reduce cavitation before setting. 

Kingfisher produce special fittings with no balls and springs (click here for an example) but if a standard thread is required an unassembled body may be offered which has an un-peened lip. 

What is a Zerk? 

The patent for the Zerk fitting was granted to Oscar Zerk in January 1929 who was an employee of the Alemite Corporation USA.

for more information click wikipedia

Why stress relieve springs?

By heating the springs to 450 degrees C the wire retains its strength and the balls will always reseat even with very viscous grease.


What does Kingfisher Stock Classification of Parts mean?

Class 1 parts
These parts are in high demand and are widely used throughout the world. Kingfisher holds significant stocks and makes resources available to respond quickly. All materiel, machinery, steel, wire and balls are readily available to increase output if required.

Class 2 parts
Significant sales occasional volume demand and regularly sold so usually held in stock. All materiel, machinery, steel, wire and balls are readily available to increase output if required.

Class 3 parts
Sporadic sales may be manufactured against forward schedules. Less common types of thread stocks may be available however lead-time would often be required of 2-4 working weeks. All materiel, machinery, steel, wire and balls are readily available to increase output if required.

Class 4 parts
Low demand and made to order items. Some stocks may be available if production has over-run. All materiel, machinery, steel, wire and balls are usually available to increase output if required but exotic material if required may need to be purchased. Deliveries can vary depending on factors such as purchase items, the complexity of the part and the quantities required.

What is Monel?

Monel is a trademark of Special Metals Corporation for a series of nickel alloys, primarily composed of nickel (up to 67%) and copper, with some iron and other trace elements. Monel was named after company president Ambrose Monell, and patented in 1906

Compared to steel, Monel is very difficult to machine as it work-hardens very quickly. It needs to be turned and worked at slow speeds and low feed rates. It is resistant to corrosion and acids, and some alloys can withstand a fire in pure oxygen. It is commonly used in applications with highly corrosive conditions. Small additions of aluminium and titanium form an alloy (K-500) with the same corrosion resistance but with much greater strength due to gamma prime formation on aging. Monel is typically much more expensive than stainless steel.

Monel's corrosion resistance makes it ideal for marine applications such as piping systems, pump shafts, seawater valves, trolling wire, and strainer baskets. Some alloys are completely non-magnetic and are used for anchor cable aboard minesweepers,[4] housings for magnetic-field measurement equipment. In recreational boating, Monel wire is used to seize shackles for anchor rodes, Monel is used for water and fuel tanks, and for under water applications. It is also used for propeller shafts and for keel bolts.

However, because of the problem of electrolytic action in salt water (also known as Galvanic corrosion), in shipbuilding monel must be carefully insulated from other metals such as steel.

The New York Times of August 12, 1915 published an article about a 215 foot yacht, "the first ship that has ever been built with an entirely monel hull," that "went to pieces" in just six weeks and had to be scrapped, "on account of the disintegration of her bottom by electrical action." The yacht's steel skeleton deteriorated due to electrolytic interaction with the monel.
source Wikepedia July 2011

Whitworth threads - what are they?

British Standard Whitworth (BSW) is one of a number of imperial unit based screw thread standards which use the same bolt heads and nut hexagonal sizes, the others being British Standard Fine thread (BSF) and British Standard Cycle. These three are collectively called Whitworth threads.  

for more information on Whitworth threads click wikipedia


Tribology is the science and engineering of interacting surfaces in relative motion. It includes the study and application of the principles of friction, lubrication and wear. Tribology is a branch of mechanical engineering.

For more information on Tribology click wikipedia or Leeds University


The acronym ISIR is widely used and has disparate meaning. In manufacturing it stands for :
Initial Sample Inspection Report


The Production Part Approval Process (PPAP) provides customers with evidence that:

  • Component suppliers have understood their requirements.
  • The product meets the customers requirements.
  • The production process is capable of consistently producing conforming product.

for more information click wikipedia

Dryseal Threads?

National Pipe Taper Fuel (NPTF) also called Dryseal American National Standard Taper Pipe Thread, defined by ANSI B1.20.3, designed to provide a more leak-free seal without the use of teflon tape or other sealant compound. NPTF threads are the same basic shape but with crest and root heights adjusted for an interference fit, eliminating the spiral leakage path.

for  more information clcik wikipedia

What are the "R" series threads?

The "R" has been adopted by the German DIN standards and is an abbreviation of Rohrgewinde which is German for external Pipe (Tube) thread and is used to define a taper thread exactly the same as BSPT. e.g. R1/8" = 1/8" x 28 BSPT
When "G" is used instead of "R" the threads are external parallel BSPP (was BSPF)