S-GFG Grease Filler Gun
The STAR S-GFG Grease Filler Gun is a hand-operated tool engineered specifically for refilling high-viscosity grease into Central Lubrication System (CLS) cylinders, grease gun barrels, and lubrication reservoirs. Unlike service grease guns that dispense grease into bearings and fittings, the S-GFG is a transfer and filling tool: it moves grease from bulk pails into the equipment that then does the greasing. The 700 cc bulk capacity and 57.15 mm (2-1/4") barrel accept standard 400 g (14 oz.) DIN 1284 Euro-Cartridges or bulk-packed grease from 5 kg, 15 kg, or 20 kg pails.
We at STAR engineer the S-GFG for maintenance teams that service centralised lubrication systems on CNC machines, excavators, production lines, progressive and single-line lubrication systems, wind turbines, and fleet vehicles. The zinc-plated steel construction resists corrosion in workshop and field environments. Available in three variants: S-GFG/M (Mini, 306 mm barrel) for compact reservoirs, S-GFG (Regular, 377 mm barrel) for standard CLS cylinders, and S-GFG/PL (Regular with Plug Cap) for sealed-reservoir applications. The filler gun eliminates the mess, air-pocket contamination, and grease waste associated with hand-packing bulk grease into grease gun barrels.
Rugged Build Quality
- Zinc-plated steel barrel and body for corrosion resistance. The entire barrel and body are zinc-electroplated, providing sacrificial corrosion protection that extends tool life in humid workshop environments, marine-adjacent service, and outdoor field conditions. Zinc plating prevents rust formation during storage between service cycles and resists chemical attack from grease solvents used during cleaning.
- 57.15 mm (2-1/4") barrel diameter for DIN 1284 Euro-Cartridge compatibility. The barrel bore matches the worldwide 14 oz. (400 g) DIN 1284 standard cartridge diameter, so the S-GFG accepts the same cartridges used across the full STAR lever-action and pistol-action grease gun range. For bulk filling, the 57.15 mm bore provides a 700 cc reservoir volume.
- 700 cc bulk capacity for high-volume CLS refill. A single fill of the S-GFG barrel holds enough grease to top up multiple CLS reservoir cylinders or refill several grease gun barrels without mid-job reloading. For centralised lubrication systems on CNC machines, excavators, and production-line equipment, the 700 cc capacity covers a typical reservoir top-up in one pass.
- 377 mm (14-27/32") barrel length on the regular model. The extended barrel length provides the internal volume for the full 700 cc bulk capacity and gives the operator leverage during the push-fill stroke. The S-GFG/M mini variant uses a shorter 306 mm (12-3/64") barrel for compact CLS reservoirs where the regular barrel is physically too long to fit.
- Cast aluminium adjusting flange for secure barrel-to-head connection. The adjusting flange locks the barrel to the head assembly with positive engagement, preventing barrel rotation during the fill stroke and maintaining seal integrity under the push pressure of high-viscosity grease transfer.
- Heavy-duty plunger rod with follower plate. The plunger rod and follower plate are sized for high-viscosity grease transfer (NLGI 2 and NLGI 3 grades). The follower plate maintains a positive seal against the barrel wall during the push stroke, preventing grease bypass and ensuring complete barrel evacuation without residual grease left behind.
- Machined non-return valve in the head. A precision-machined one-way valve prevents grease from flowing back into the barrel after each push stroke, so the transferred grease stays in the target reservoir or grease gun barrel without back-flow during the plunger reset.
- Rolled threads on the barrel-to-head joint. Rolled threads provide smooth, quick barrel removal for cleaning and cartridge loading. Work-hardened thread surfaces resist cross-threading and stripping across repeated disassembly cycles.
- Plug cap on the S-GFG/PL variant for sealed-reservoir applications. The plug cap seals the barrel outlet when the filler gun is not in use, preventing grease contamination from dust, debris, and moisture ingress during storage and transport. Essential for food-processing and pharmaceutical environments where contamination control is critical.
- Thread options: 1/8" BSPT, 1/8" NPT, M10x1, custom. The outlet thread matches standard grease gun filler nipples and CLS reservoir inlet fittings across European (BSPT), Americas (NPT), and metric (M10x1) standards. Custom thread specifications available for OEM orders.
How the S-GFG Works
The S-GFG is a transfer tool, not a service gun. It moves grease from a bulk source (pail or cartridge) into a target (CLS cylinder, grease gun barrel, or lubrication reservoir) in three steps: load the filler gun, connect to the target, and push-transfer the grease.
- Load the filler gun. Choose between two loading methods. For cartridge fill: unscrew the barrel from the head, insert a standard 400 g (14 oz.) DIN 1284 Euro-Cartridge nose-first, peel both seals, and reassemble. For bulk fill: retract the plunger rod fully, unscrew the barrel, dip the barrel mouth into a 5 kg, 15 kg, or 20 kg grease pail, and pack grease firmly against the sidewalls to fill the 700 cc reservoir without air pockets. The zinc-plated barrel gives good grip during the unscrew-and-reassemble steps.
- Connect to the target. Thread the filler gun outlet onto the target's filler nipple or inlet fitting. For CLS cylinder refill: connect to the reservoir's grease inlet port (typically 1/8" BSPT or M10x1 on European CLS systems). For grease gun barrel refill: connect to the grease gun's bulk-loader valve on the head. For reservoir top-up: connect to the reservoir's fill port. The machined non-return valve in the S-GFG head prevents back-flow during connection.
- Push-transfer the grease. Push the plunger rod forward with steady palm pressure. The follower plate drives the grease column through the non-return valve and into the target reservoir or barrel. Continue pushing until the target is full (indicated by increased resistance on the plunger rod as the target back-pressures). Disconnect, cap the outlet (S-GFG/PL variant), and store. One 700 cc fill typically covers a full CLS cylinder top-up or 1-2 grease gun barrel refills depending on the target gun's capacity.
The S-GFG eliminates the three main problems with hand-packing bulk grease: air pockets trapped during manual packing (which cause air-lock priming failures in the target grease gun), grease contamination from exposed surfaces during transfer, and grease waste from spillage during the packing process. For maintenance teams refilling multiple grease guns per shift or topping up CLS reservoirs on scheduled preventive maintenance cycles, the filler gun pays back through reduced air-lock troubleshooting time and reduced grease waste.
| Parameter | Value |
|---|---|
| Model | S-GFG (Regular) / S-GFG/M (Mini) / S-GFG/PL (Regular with Plug Cap) |
| Type | Manual Grease Filler Gun (Transfer Tool) |
| Mechanism | Hand Operated (Plunger Push) |
| Purpose | Refill CLS cylinders, grease gun barrels, lubrication reservoirs |
| Barrel Length (Regular / PL) | 14-27/32" (377 mm) |
| Barrel Length (Mini) | 12-3/64" (306 mm) |
| Barrel Diameter | 57.15 mm / 2-1/4" |
| Cartridge Capacity | 400 g (14 oz.) DIN 1284 Euro-Cartridge |
| Bulk Capacity | 700 cc |
| Material | Zinc-plated steel (barrel and body) |
| Head | Cast aluminium with adjusting flange |
| Non-Return Valve | Machined precision one-way valve |
| Plug Cap | Included on S-GFG/PL variant only |
| Thread Options | 1/8" BSPT / 1/8" NPT / M10x1 / Custom |
| Grease Compatibility | NLGI 1, NLGI 2, NLGI 3 (all standard chemistries) |
| Country of Origin | India (Made in Ludhiana, Punjab) |
| Certifications | ISO 9001:2015, CE, RoHS compliant |
| HS Code | 8205 |
| Warranty | 1 year against manufacturing defects |
| OEM / Private Label | Available (MOQ applies) |
The S-GFG is available in three variants. All share the same 57.15 mm barrel diameter, 700 cc bulk capacity, zinc-plated steel construction, and DIN 1284 cartridge compatibility. They differ in barrel length and outlet configuration.
For compact CLS reservoirs and tight-access refill points where the regular barrel is too long
Same 57.15 mm bore, 700 cc bulk, 400 g cartridge
Zinc-plated steel
Standard model for CLS cylinder refill, grease gun barrel refill, and reservoir top-up
57.15 mm bore, 700 cc bulk, 400 g cartridge
Zinc-plated steel
Same as S-GFG Regular plus sealed plug cap on outlet
Prevents contamination during storage and transport
For food-processing, pharmaceutical, and clean-room environments
Zinc-plated steel
Four engineering choices define the S-GFG as the professional grease filler gun for CLS refill and grease gun barrel loading.
The S-GFG targets maintenance teams that refill centralised lubrication systems, top up grease gun barrels from bulk pails, and service lubrication reservoirs on industrial, agricultural, construction, and fleet equipment.
Related Product Categories
Buying Guide: When the S-GFG is the Right Choice
The S-GFG is the correct tool when the maintenance workflow involves refilling CLS reservoirs, bulk-loading grease gun barrels from pails, or transferring grease into lubrication system cylinders. It is not a service grease gun (it does not grease bearings directly); it is the tool that fills the tools that do the greasing.
Pick the S-GFG for CLS refill and grease gun barrel loading
Maintenance teams servicing centralised lubrication systems on CNC machines, excavators, production lines, wind turbines, and fleet vehicles need a clean, sealed transfer path from bulk grease pail to CLS reservoir. The S-GFG provides that path without exposing the grease to workshop air, dust, or moisture. For workshops that bulk-fill multiple grease guns per shift, the filler gun eliminates the air-pocket priming failures that hand-packing causes.
S-GFG vs grease filler pump: which do I need?
A grease filler gun (S-GFG) is a portable handheld tool for refilling individual grease guns and small CLS reservoirs from a pail. A grease filler pump is a larger stationary or semi-portable device that mounts on a 5-gallon (25-50 lb) pail and pumps grease continuously into multiple guns or large reservoirs. Pick the S-GFG for portable, individual-gun refill and small CLS top-up; pick a filler pump for high-volume depot-style refill stations where multiple guns are reloaded per shift from a single mounted pail.
S-GFG vs hand-packing bulk grease: why use a filler gun?
Hand-packing bulk grease into a grease gun barrel (scooping from a pail with a spatula) introduces air pockets against the barrel sidewalls, exposes the grease to contamination from workshop air and debris, and wastes grease through spillage. The S-GFG's sealed plunger-driven transfer eliminates all three problems: no air pockets (solid grease column pushed through), no contamination (sealed path from barrel to outlet), and no spillage (contained transfer). The time saved on priming troubleshooting alone justifies the filler gun for any workshop that bulk-fills more than 2-3 grease guns per week.
Which variant: Mini, Regular, or Plug Cap?
Pick the S-GFG/M (Mini, 306 mm) when the CLS reservoir inlet is in a tight-access location where the regular 377 mm barrel physically cannot fit, or when the target reservoirs are compact (small CNC machines, small industrial equipment). Pick the S-GFG (Regular, 377 mm) for standard CLS cylinder refill on excavators, production lines, fleet vehicles, and general grease gun barrel loading. Pick the S-GFG/PL (Regular with Plug Cap) when the filler gun must be stored or transported with the outlet sealed to prevent contamination ingress; essential for food-processing, pharmaceutical, and clean-room environments where contamination control is a regulatory requirement.
For OEM and industrial-supply distributor trade
The S-GFG family is available for OEM and private-label manufacture for industrial-supply distributors, CLS equipment service networks, and lubrication-equipment wholesale trade. All three variants (Mini, Regular, Plug Cap) can be custom-branded with distributor logos, packaged for industrial retail or trade format, and supplied with custom thread specifications. Contact the STAR export team for distributor pricing, MOQ baseline, BSPT/NPT/M10x1 thread variants, carrying case options, and mixed-container consolidation with other STAR lubrication products.
Frequently Asked Questions: S-GFG Grease Filler Gun (CLS Refill, Grease Gun Barrel Loading)
What is a grease filler gun and how is it different from a regular grease gun?
A grease filler gun is a hand-operated transfer tool that moves grease from a bulk source (pail or cartridge) into a target (CLS cylinder, grease gun barrel, or lubrication reservoir). A regular grease gun dispenses grease into bearings and fittings at high pressure (6,000-12,000 PSI). The S-GFG does not grease bearings directly; it fills the tools and systems that do the greasing. The distinction matters because a filler gun is optimised for clean, air-pocket-free transfer at low pressure, while a service grease gun is optimised for high-pressure delivery through a coupler into a zerk fitting. Workshops need both: the filler gun to reload, and the service gun to dispense.
How does the S-GFG grease filler gun work?
Load the barrel with grease (from a 400 g cartridge or by bulk-packing from a pail), connect the outlet thread to the target's filler nipple or inlet port, and push the plunger rod forward with steady palm pressure. The follower plate drives the grease column through the machined non-return valve and into the target. The non-return valve prevents back-flow during the plunger reset. One 700 cc fill covers a full CLS cylinder top-up or 1-2 grease gun barrel refills depending on the target capacity. No trigger, no lever, no pump mechanism; the operator's palm pressure on the plunger rod is the driving force.
What is the difference between a grease filler gun and a grease filler pump?
A grease filler gun (S-GFG) is a portable handheld tool for refilling individual grease guns and small CLS reservoirs. A grease filler pump is a larger device that mounts on a 5-gallon (25-50 lb) pail and pumps grease continuously into multiple guns or large reservoirs. The filler gun is portable, requires no mounting, and works anywhere the operator can carry it. The filler pump is stationary or semi-portable, handles higher volumes, and is the correct choice for depot-style refill stations. Pick the S-GFG for field service, individual-gun refill, and small CLS top-up; pick a filler pump for high-volume workshop reload stations.
Can the S-GFG be used with standard 14 oz. (400 g) grease cartridges?
Yes. The 57.15 mm barrel diameter accepts standard 14 oz. (400 g) DIN 1284 Euro-Cartridge grease cartridges, the same cartridges used across the full STAR lever-action and pistol-action grease gun range. Cartridge loading is the cleaner option when the operator wants to avoid bulk-packing from a pail; the cartridge slides into the barrel nose-first with both seals peeled, and the filler gun is ready to transfer. For bulk loading, the same barrel accepts 700 cc of grease packed directly from a pail.
Why use a grease filler gun instead of hand-packing bulk grease?
Hand-packing introduces air pockets, exposes grease to contamination, and wastes grease through spillage. The S-GFG eliminates all three problems. Air pockets trapped during hand-packing are the primary cause of grease gun priming failure after bulk refill; the filler gun's plunger-driven transfer pushes a solid grease column without air voids. Contamination from workshop dust and moisture during open-air hand-packing degrades grease quality; the sealed transfer path keeps grease isolated. Spillage during scooping and packing wastes 5-15% of the grease per refill cycle; the contained transfer eliminates spillage entirely.
How do I prevent air locks when refilling a grease gun with the S-GFG?
The S-GFG's plunger-driven transfer inherently prevents air locks because it pushes a solid grease column into the target barrel without the air voids that hand-packing creates. For additional air-lock prevention: ensure the filler gun barrel is packed without air pockets during loading (push grease firmly against the sidewalls when bulk-filling), connect the filler gun outlet firmly to the target's filler nipple before pushing (no gap for air ingress), and push the plunger with steady continuous pressure rather than short jerky strokes. If the target grease gun still shows air-lock symptoms after filler-gun refill, the air is likely in the target gun's head or coupler path rather than in the barrel; prime the target gun normally using its air bleeder valve.
What is a Central Lubrication System and why does it need a filler gun?
A Central Lubrication System (CLS) is an automated or semi-automated system that distributes grease from a central reservoir to multiple lubrication points on a machine through a network of lines and metering valves. CLS systems are standard on CNC machines, excavators, production-line equipment, wind turbines, and heavy industrial machinery. The central reservoir needs periodic refilling with clean grease; the S-GFG provides the sealed transfer path from bulk pail to reservoir without contamination. Progressive lubrication systems, single-line systems, and dual-line systems all use central reservoirs that need the same refill approach. Without a filler gun, the alternative is hand-packing or using a pneumatic filler; the S-GFG is the portable manual option for field service and small-shop maintenance.
What industries use grease filler guns?
Any industry that operates centralised lubrication systems or bulk-fills grease guns from pails: manufacturing (CNC machines, production lines, conveyor systems), mining (excavator CLS, heavy-equipment central greasing), construction (fleet vehicle CLS, crane lubrication), agriculture (tractor and combine harvester CLS), wind energy (turbine nacelle CLS), food processing (sealed-reservoir CLS with food-grade grease), pharmaceutical (contamination-controlled CLS), marine (vessel deck equipment CLS), and automotive workshops (grease gun barrel reload stations). The S-GFG/PL plug-cap variant is specifically positioned for food-processing and pharmaceutical environments where contamination control is a regulatory requirement.
Is bulk grease cheaper than cartridges for grease gun refill?
Yes, significantly. Bulk grease from 5 kg, 15 kg, or 20 kg pails costs 40-60% less per kilogram than the same grease in 400 g cartridge format. The cost difference comes from cartridge packaging, individual sealing, and retail distribution margins. For workshops that use more than 2-3 cartridges per week, switching to bulk grease with a filler gun pays back the filler gun cost within weeks. The S-GFG makes bulk-to-gun transfer clean and air-pocket-free, which removes the main practical barrier to bulk grease adoption (the mess and priming failures of hand-packing).
Can I use the S-GFG to refill any brand of grease gun?
Yes, provided the target grease gun has a standard bulk-loader filler nipple on the head (1/8" BSPT, 1/8" NPT, or M10x1 thread). Most professional-grade lever-action and pistol-action grease guns from any manufacturer include a filler nipple for bulk loading. The S-GFG's outlet thread connects to this nipple and pushes grease directly into the target barrel. For grease guns without a filler nipple, the alternative is to unscrew the target barrel and pack grease directly from the S-GFG barrel into the target barrel mouth (barrel-to-barrel transfer).
How should I store the S-GFG between service cycles?
For storage under 30 days: leave grease in the barrel, cap the outlet (S-GFG/PL variant has a built-in plug cap; for S-GFG and S-GFG/M, use a thread cap), and store horizontally in a clean dry area. For storage over 30 days: empty the barrel, wipe the interior with a lint-free rag dampened in mineral spirits, dry completely, lightly grease the plunger-rod seal, cap the outlet, and store horizontally. The zinc-plated finish provides corrosion protection during storage but benefits from dry conditions. Never store with the barrel pointing up (grease settles away from the outlet and air rises to the transfer path). For seasonal maintenance schedules (quarterly CLS refill), the 30-day storage protocol is typically sufficient between service cycles.
How do I clean the S-GFG when switching grease types?
Unscrew the barrel from the head, push the plunger rod to evacuate residual grease, wipe the barrel interior with a lint-free rag dampened in mineral spirits, flush the head and non-return valve with mineral spirits, dry all components completely, and reassemble. Cross-contamination between incompatible grease chemistries (lithium + calcium, lithium + polyurea) causes hard deposits that can clog the non-return valve and block the transfer path. For workshops that rotate between different grease types for different CLS systems, maintaining separate dedicated filler guns per chemistry is the safest approach; if a single filler gun must serve multiple chemistries, thorough solvent flushing between changes is mandatory.
What PPE should I wear when using the S-GFG?
Safety glasses (ANSI Z87.1+ rated), nitrile chemical-resistant gloves, and long sleeves at minimum. The S-GFG operates at low transfer pressure (palm-push only, no mechanical advantage multiplier), so high-pressure injection injury risk is minimal compared with service grease guns at 6,000-12,000 PSI. The primary PPE concern is grease contact with skin and eyes during loading and cleaning. For food-grade grease applications, additional PPE per the grease manufacturer's MSDS may be required. Always depressurise the filler gun (disconnect from target, release plunger pressure) before disassembly or cleaning.
Is the S-GFG available for OEM and private-label orders?
Yes. All three variants (S-GFG/M, S-GFG, S-GFG/PL) are available for OEM and private-label manufacture with custom branding, packaging design, thread specifications, and carrying case options. MOQ applies as the baseline for the filler gun family. Shipping is sea freight to major industrial-supply hub ports worldwide. Global export destinations span Europe, UK, Middle East, Africa, South America, and Asia Pacific markets. Contact the STAR export team for distributor pricing, lead times, catalogue requests, and packaging specifications.
Why Global Buyers Trust STAR
We at STAR have manufactured lubrication equipment in our ISO 9001:2015 certified workshop in Ludhiana, Punjab, India since 1980. The S-GFG Grease Filler Gun ships with full export documentation and STAR industrial-supply distributor partner programme documentation. STAR authorized distributor network covers 27+ countries with documented export experience across European, Middle Eastern, African, Latin American, Asian, and Oceania markets.