Easy Greasing with the Macnaught K29 Flexigun

(Taken from Macnaught. Republished with permission. Edited for point of view, recency and relevance.)

Why choose the Macnaught K29 Flexigun? (See our comprehensive Grease Gun Guide for the full Macnaught range)

This top-of-the-line grease gun is a favourite among users because of its many features and benefits:

• Built tough, it’s confidently backed by Macnaught’s 10-year limited manufacturer’s warranty
• Unique flexible hose that allows you to reach tight spaces and awkward angles with ease
• Delivers grease quickly and efficiently
• Strong, die-cast head and heavy gauge steel barrel for reliable durability and long service life
• Gun is constructed with a heavy-duty aluminium head and reinforced trigger for durability
• Designed for true one-handed operation
• Can be converted to fit the Macnaught J3 grease pump
• Can fit 450-gram grease cartridges
• Bulk-fillable
• Built-in air bleed valve for easy priming
• Easy-to-use push-in handle
• Heavy-duty actuator
• Lockable follower and bleeder eliminates risk of air block for easy bleeding
• Service kits available
• Increased pressured can be produced by short strokes (low volume) or long strokes (high volume)
• Kits come with KY SUPERGRIP™ 3-jaw high pressure coupler*
• Fully repairable

*Comes bundled in the greasing kits

The Macnaught catalogue (page 4) also states that the K29 has “superior performance through unique short stroke piston design that builds pressure up to 10,000 psi (68,900 kPa).”

More features (page 14 of the international catalogue):

Built for versatility

The K29 Flexigun can be used with a wide range of lubricants, including:

• Standard grease
• Synthetic grease
• Semi-fluid lubricants

That makes it the best choice of grease gun for use cases in these settings:

• Agricultural
• Automotive
• Industrial
• Mining (“zinc model” for underground mines)
• Transport

Users swear by its durability

The Macnaught K29 Flexigun is built to last, but don’t take our word for it.

Just ask them:

(Taken from Macnaught’s Facebook post)

People can’t stop talking about it on Google Reviews as well:

Here’s the Macnaught K29 Flexigun in action:

Shop for Macnaught K29 grease guns.

Here’s the variant designed for underground mining.

You can also buy the basic greasing kit, which comes with an additional KY SUPERGRIP™ coupler and a 450-gram grease cartridge.

AIMS' Note on Safe Use of Lubricants

• Protective gear: Protect your skin and eyes! Wear chemical-resistant gloves to prevent skin irritation or absorption of chemicals. Safety glasses or goggles provide essential eye protection. Additionally, consider using a respirator if fumes are particularly strong or you are working for an extended period.
• Labels and instructions: Before using any product, carefully read the instructions and safety warnings on the label. Follow the specific guidelines for usage, proper handling and disposal. Check for ‘use by’ dates.
• Fire hazards: Many parts cleaners and lubricants are flammable. Keep them away from open flames, heat sources, and anything that could cause a spark. Store these products in a cool, dry location in their original containers, out of the reach of children and pets.
• Environment: Choose less toxic and environmentally friendly options whenever possible. Make sure there are no open flames or anything that can ignite flammable substances. Dispose of used products and empty containers responsibly according to the instructions or your local hazardous waste guidelines.
• Ventilation: When working with chemicals that release strong fumes, always work in a well-ventilated area, preferably outdoors or in an open area. If you are working indoors, make sure that the windows are open and consider using fans to increase airflow and disperse / vent out the fumes.

People Also Ask — Macnaught K29 Grease Gun

Q: What makes the Macnaught K29 FlexiGun different from standard grease guns?

The Macnaught K29 FlexiGun is a professional-grade lever grease gun featuring a flexible hose fitting (rather than a fixed rigid nozzle) that allows the coupler to reach grease nipples in confined or awkward positions — a common requirement in industrial maintenance. The K29 uses a heavy-duty lever action mechanism rated for high output per stroke, a sealed plunger system to prevent grease bypass and maintain prime, and a professional steel barrel. It accepts standard 400g grease cartridges and is designed for continuous maintenance use in harsh industrial environments.

Q: What grease cartridge size does the Macnaught K29 use?

The Macnaught K29 FlexiGun uses standard 400g (400cc) grease cartridges, which is the universal size for professional lever grease guns in Australia. These cartridges are available in a wide range of grease types — lithium-based general purpose, moly-fortified EP2, calcium sulphonate complex, and others — allowing the K29 to be used with whatever grease specification your machinery OEM requires. Bulk grease can also be loaded directly into the barrel using a suction fill or open-fill technique, which is more cost-effective for high-volume maintenance operations.

Q: How do I clear a blocked grease gun coupler?

A blocked coupler is usually caused by old hardened grease, contamination in the nipple, or a seized ball-check valve in the coupler itself. To clear: (1) disconnect the coupler from the nipple; (2) wipe the coupler tip and inspect for debris; (3) prime the gun with a short stroke to clear the line; (4) try applying to the nipple under lever pressure — sometimes the pressure itself clears a partially blocked nipple path. If the coupler hydraulic valve is seized, replace the coupler — they are inexpensive consumable items. For a completely seized nipple, a nipple extraction tool (nipple remover) is required before lubrication can proceed.

Q: What is the correct grease for bearings in Australian industrial applications?

The most widely used bearing grease in Australian industry is lithium complex or calcium sulphonate complex EP2 (NLGI Grade 2 Extreme Pressure). For most rolling element bearing applications up to 120°C and moderate loads, a quality EP2 lithium complex grease (e.g., Mobilux EP2, Shell Alvania EP2, CRC Bel-Ray) meets manufacturer requirements. For high-temperature bearings (120–180°C+), polyurea-based or calcium sulphonate complex greases provide superior oxidation stability. Always verify the grease type and interval against the bearing manufacturer's specification — mixing incompatible greases can destroy a bearing quickly.

Q: How much grease should I pump into a bearing during relubrication?

Over-greasing is one of the most common causes of bearing failure — excess grease churns, generates heat, degrades the lubricant, and can damage seals. As a general rule, the relubrication quantity for a rolling element bearing is approximately: G (grams) = 0.005 × D × B, where D = bearing outside diameter (mm) and B = bearing width (mm). For example, a 6205 bearing (OD 52mm, width 15mm): G = 0.005 × 52 × 15 = 3.9g — roughly 1–2 strokes of a standard grease gun. Verify the quantity against the OEM lubrication manual for critical equipment and use metered dispensing tools where precise volumes are important.