Hitachi
Hitachi 981840 Hammer Grease 0.30g Tube
★★★★★
Keep your Hitachi rotary hammer running at spec — this OEM-formulated grease protects the internal impact mechanism where friction wear starts.
$12.52*
View on Amazon
✓ In Stock on Amazon.com
*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.
Affiliate Disclosure: Studio Supplies may earn a commission from qualifying purchases made through links on this page, at no additional cost to you. This helps support our editorial team.
Notice a mistake? Let Us Know
Overview
Key Features
Hitachi Power Tools has renamed to Metabo HPT. Same great tools, with only a new name.
Designed to the highest standards
Rigorously tested for both performance and durability
30-Day Warranty
Specifications
Brand
Hitachi / Metabo HPT
Model
981840
Type
Hammer Grease
Quantity
0.30g tube
Application
Rotary and demolition hammer internal mechanisms
Warranty
30 days
Pros & Cons
👍 Pros
- Factory-formulated specifically for Hitachi/Metabo HPT hammer mechanisms, meaning the viscosity and additive package are matched to the operating temperature and impact loads those internal components generate.
- OEM Hitachi/Metabo HPT formulation is matched to the operating temperatures and material tolerances of compatible rotary hammer mechanisms — not a generic substitute that approximates the specification
- Single-service tube sizing provides precise application quantity, preventing over-greasing which causes mechanism drag and heat buildup in rotary hammer internals
- Single-application 0.30g tube sizing matches the OEM-specified service quantity, eliminating guesswork about how much to apply during a scheduled internal maintenance service.
- Using genuine OEM grease during warranty-period maintenance avoids the argument that an aftermarket substitute caused a mechanical failure — a practical protection when a tool is still under manufacturer coverage.
- Genuine OEM part approach ensures viscosity and additive package match what the tool was originally designed to use at the factory
- Small enough to store inside a tool bag alongside the rotary hammer so the next service requires no separate supply run
- The specialized formulation resists breakdown under the rapid, repetitive impact cycles inside rotary hammer mechanisms, where general-purpose grease would separate or carbonize faster.
- Genuine Hitachi/Metabo HPT accessories ensure material compatibility with the seals and internal polymers in the hammer mechanism, reducing risk of seal swelling or accelerated wear from incompatible additives.
- 30-day warranty provides recourse for defective product
👎 Cons
- The 0.30g tube is a very small quantity — barely enough for a single service application — so there is no economy of scale benefit and no leftover supply for future maintenance without purchasing another tube.
- At 0.30g, this is a single-application quantity — technicians servicing multiple tools in one session need to order several tubes ahead of the service day
- Compatibility is limited to Hitachi and Metabo HPT rotary hammers — it is not a valid substitute for grease specifications on tools from other manufacturers
- The 30-day warranty is unusually short for a maintenance consumable, providing essentially no meaningful coverage window for a product that is applied once and consumed immediately upon use.
- No detailed application instructions are included with the product listing — users unfamiliar with hammer mechanism disassembly must locate the tool's service manual separately before they can apply the grease correctly.
- No applicator tip or brush is included — precise delivery to internal mechanism components requires a small tool or pick to reach recessed areas correctly
- The small tube format is not cost-effective for shops doing fleet maintenance at volume — bulk service kits through Metabo HPT service distributors may be more economical per gram
- Availability of this specific OEM part number can be inconsistent through retail channels, meaning a planned maintenance service may be delayed waiting for stock if not ordered in advance.
- Only compatible with Hitachi/Metabo HPT hammer tools — it has no value for owners of other power tool brands, making it a strictly single-brand consumable with no cross-platform utility.
- The 30-day warranty window is short relative to the service interval of a consumable used to extend a tool's operational lifespan
Frequently Asked Questions
Which specific Hitachi/Metabo HPT tools is this grease designed for, and can it be used in non-hammer tools?
This grease is formulated specifically for Hitachi (now Metabo HPT) hammer mechanisms — rotary hammers and demolition hammers that use a piston-and-striker internal drive system. It is not a general-purpose grease and should not be substituted into drill chucks, angle grinder gear cases, or other tool types where a different lubricant specification is required.
Which tools is this hammer grease designed for?
The 981840 is formulated specifically for Hitachi and Metabo HPT rotary hammers. It is intended for the internal hammer mechanism components — not as a general-purpose bearing grease or gear lubricant for other tool types.
Is 0.30g enough for a full service application?
Yes — the 0.30g tube is sized as a single-service application. It contains the precise quantity needed for a standard lubrication service on the internal mechanism of compatible rotary hammers. It is not a bulk supply; stock multiple tubes if you service tools frequently.
How often should this grease be applied to a rotary hammer during normal use?
Hitachi/Metabo HPT recommends regreasing the hammer mechanism at the service intervals specified in the tool's manual — typically after a set number of operating hours or during any disassembly for maintenance. The 0.30g tube is sized for a single application of the internal mechanism rather than ongoing top-up lubrication.
Is the 0.30g tube sufficient for one full service application, or will I need multiple tubes?
The 0.30g tube contains the quantity Hitachi specifies for one internal mechanism regreasing on the models it is designed for. For tools with larger hammer mechanisms or if grease is being applied to multiple points per service, check the tool's service manual for the correct volume — you may need more than one tube.
Can I use this grease on Bosch or Makita rotary hammers?
Not recommended. This is Hitachi/Metabo HPT factory-specified grease matched to the material tolerances of their mechanisms. Hammer mechanism compositions and clearances vary between manufacturers — use the lubricant specified by each tool's manufacturer.
How frequently should rotary hammer mechanisms be re-greased?
High-use tools on concrete and masonry benefit from inspection and re-greasing every 6–12 months under heavy use. Consult the specific tool's service manual for the manufacturer's recommended interval, as it varies by model and use intensity.
Can aftermarket or hardware store grease be substituted for this product in Hitachi hammer tools?
Technically, any grease can be applied, but aftermarket substitutions risk using incompatible viscosity grades or additives that degrade under the high-temperature, high-impact conditions inside a rotary hammer mechanism. Using the factory-specified grease maintains performance standards and is the only defensible choice if the tool is under warranty.
Does the 30-day warranty on this product cover the grease tube itself or the tool it is applied to?
The 30-day warranty covers the grease product itself — defects in packaging or product integrity. It does not extend coverage to the tool the grease is applied to, which is governed by the tool's own separate warranty terms.
Will using non-OEM grease void the warranty on a Hitachi rotary hammer still under coverage?
Using non-specified lubricants may affect warranty claims. Using the correct OEM-specified grease like the 981840 is the safest approach for tools still within their warranty period.
Related Products
