The Britool Hallmark HMAOF21 21 Piece Aluminium Oil Filter Cap Wrench Set is a comprehensive professional automotive service kit designed for removing a wide range of compatible oil filters and oil filter housings.
The set contains 21 aluminium alloy cap-type oil filter wrenches, covering diameters from 64mm to 101mm with a wide selection of flute configurations.
Unlike thinner pressed-steel filter wrench designs, these cap wrenches are manufactured from aluminium alloy, providing a strong and rigid tool while helping to minimise the risk of damage to compatible filter housings when the correct size is selected.
The aluminium construction is considerably stronger than typical black 7 and 16-gauge steel versions, making the set particularly suitable for professional automotive workshop use.
The cap wrenches feature a 1/2" square drive and the set is additionally supplied with a hex wrench and strap wrench for increased versatility.
Everything is organised in a dedicated blow-moulded storage case for convenient workshop storage and transportation.
Please note: This set forms part of the Britool Hallmark range, but the individual tools themselves are not Britool Hallmark branded.
Key Features
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Part of the Britool Hallmark professional automotive range
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Britool Hallmark reference: HMAOF21
- 21-piece aluminium oil filter cap wrench set
- 1/2" square drive
- Cap-type oil filter wrench design
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Sizes covering 64mm to 101mm
- Wide selection of flute configurations
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Manufactured from aluminium alloy
- Strong and rigid construction
- Designed to help minimise damage to compatible filter housings
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Stronger than typical black 7 and 16-gauge steel versions
- Suitable for a broad range of vehicle oil filters and filter housings
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Includes hex wrench
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Includes strap wrench
- Suitable for professional automotive servicing
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Supplied in a blow-moulded storage case
- Individual tools within the set are not branded
21 Aluminium Oil Filter Cap Wrenches
The set includes the following oil filter cap wrench sizes and flute configurations:
- 64mm – 14 flute
- 67mm – 14 flute
- 73mm – 14 flute
- 73mm – 15 flute
- 73mm – 30 flute
- 74mm – 14 flute
- 74mm – 15 flute
- 74mm – 8 flute
- 75mm – 15 flute
- 76mm – 12 flute
- 78.5mm – 15 flute
- 78mm – 15 flute
- 84mm – 18 flute
- 86mm – 14 flute
- 89mm – 15 flute
- 91mm – 12 flute
- 91mm – 15 flute
- 91mm – 15 flute – Toyota / Nissan application
- 92mm – 15 flute
- 95mm – 15 flute
- 101mm – 15 flute
This updated specification provides 21 individual cap wrenches, with multiple diameter and flute combinations to suit a broad range of compatible oil filters and filter housings.
Diameter and Flute Selection
Selecting the correct oil filter cap wrench requires matching both the diameter and flute count of the filter or filter housing.
The flute count refers to the number of faces or engagement points around the circumference of the filter.
For example, this set contains several different 74mm options:
- 74mm – 8 flute
- 74mm – 14 flute
- 74mm – 15 flute
Although all three have a nominal 74mm diameter, their different flute configurations mean they are intended to engage with different filter profiles.
Likewise, the set includes several 91mm configurations, including 12-flute and 15-flute versions.
Always check both the diameter and number of flutes before selecting the wrench.
Toyota / Nissan 91mm 15-Flute Wrench
The supplied specification identifies one of the 91mm 15-flute cap wrenches specifically for Toyota / Nissan applications.
A second 91mm 15-flute wrench is also included in the supplied size specification.
Vehicle applications can vary according to model, engine, year and filter manufacturer, so compatibility should always be confirmed against the actual filter or filter housing before use.
Aluminium Alloy Construction
The cap wrenches are manufactured from aluminium alloy, providing a strong yet relatively lightweight construction for professional workshop use.
Compared with thinner pressed-steel cap wrenches, the rigid aluminium construction provides positive engagement with a correctly matched filter housing while helping to minimise the possibility of distortion.
The aluminium construction also helps reduce the risk of damage to compatible filter housings when the correct size and flute profile are used.
1/2" Square Drive
The cap-type oil filter wrenches feature a 1/2" square drive, allowing them to be operated using a suitable 1/2" drive ratchet, extension bar or other appropriate hand-drive tool.
Extension bars can be particularly useful where an oil filter or filter housing is positioned deeper within the engine compartment.
Excessive leverage should always be avoided, particularly when working with plastic or composite filter housings.
Hex Wrench and Strap Wrench Included
In addition to the aluminium cap wrenches, the set is supplied with a:
The strap wrench provides an alternative method of gripping compatible filters where a conventional cap wrench is not suitable.
This additional equipment increases the versatility of the HMAOF21 for workshops servicing different vehicle makes, models and filter designs.
Professional Automotive Applications
The Britool Hallmark HMAOF21 is suitable for applications including:
- Engine oil and filter servicing
- Oil filter removal
- Cartridge oil filter housing removal
- Compatible spin-on filter removal
- Routine vehicle servicing
- Professional automotive workshops
- Independent garages
- Service centres
- Fleet maintenance
- Mobile mechanics
- Vehicle restoration
- Home workshops
- General automotive maintenance
Blow-Moulded Storage Case
The complete set is supplied in a blow-moulded storage case.
Dedicated storage positions keep the different filter wrench sizes organised and make it easier to select the required diameter and flute configuration during servicing.
The case also provides convenient storage and transportation while helping ensure the complete set remains together between jobs.
The Britool Hallmark Range
The Britool Hallmark range was developed by Britool in the 1980s for the automotive aftermarket and has been a long-established choice for professional workshop users.
The range covers a wide selection of automotive hand tools, socketry and specialist servicing equipment intended for professional maintenance and repair applications.
Although the HMAOF21 is supplied as part of the Britool Hallmark range, the individual tools within this particular set are not themselves Britool Hallmark branded.
This is an important distinction for buyers specifically looking for individually stamped or marked Britool Hallmark tools.
The Britool Hallmark guarantee covers defects in materials and/or workmanship when tools are used for the purpose for which they were designed and for their expected service life.
The guarantee does not extend to fair wear and tear, moving parts or consumable components, and applicable warranty terms and conditions apply.
Important Information
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Range: Britool Hallmark
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Reference: HMAOF21
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Product type: Aluminium Oil Filter Cap Wrench Set
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Number of cap wrenches: 21
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Size range: 64mm to 101mm
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Material: Aluminium alloy
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Drive size: 1/2" square drive
- Includes multiple diameter and flute combinations
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Includes hex wrench
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Includes strap wrench
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Supplied in blow-moulded storage case
- Individual tools are not Britool Hallmark branded
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Always match both the diameter and flute count to the filter or housing
- Vehicle compatibility can vary by model, engine, year and filter manufacturer
- Never force an incorrectly sized cap wrench onto a filter housing
- Take particular care when working with plastic or composite filter housings
- Avoid excessive leverage during filter housing removal
- When refitting reusable filter housings or caps, follow the vehicle manufacturer's specified tightening procedure and torque setting
