The Benchmark Abrasives BM-M38_1 cut-off wheel mandrel turns compatible straight die grinders into a compact cutting setup for small-diameter bonded abrasive wheels. Its 1/4" shank fits compatible die grinder collets, while the included mounting options allow you to run cut-off wheels with either 3/8" or 1/4" arbors.
This mandrel is the connecting accessory for many of our smaller Type 1 cut-off wheels, giving fabricators, mechanics, welders, and maintenance professionals a practical way to reach confined areas where a conventional angle grinder is too large. Pair it with the correct Benchmark Abrasives cut-off wheel for tight-access cutting, trimming, fabrication, and repair work.
For an all-Benchmark setup, the BM-M38_1 can be paired with the Benchmark Abrasives straight pneumatic die grinder and compatible 1/4" or 3/8" arbor cut-off wheels. Always match the complete setup to the wheel's diameter and maximum RPM requirements and use appropriate guarding for bonded abrasive cutting.
Quantity: 1 Mandrel
Product Specifications
Specification
Details
Product Type
Cut-Off Wheel Mandrel
Model / SKU
BM-M38_1
Shank Diameter
1/4"
Wheel Arbor Options
1/4" & 3/8"
3/8" Mounting Head
For wheels with 3/8" arbor
1/4" Mounting Head
For wheels with 1/4" arbor
Maximum RPM
25,000
Quantity
1 Mandrel
Product Features
1/4" shank for compatible straight die grinder collets
Mounts cut-off wheels with 3/8" or 1/4" arbors
Two wheel-mounting options in one compact accessory
Ideal for creating a compact straight die grinder cutting setup
Useful for tight-access fabrication, maintenance, and repair work
Compatible with many Benchmark Abrasives small-diameter Type 1 cut-off wheels
Lightweight, straightforward mounting design
Applications
Best For:
Mounting 3/8" arbor cut-off wheels
Mounting 1/4" arbor cut-off wheels
Tight-access metal cutting
Fabrication and welding
Automotive and equipment repair
Maintenance work
Trimming fasteners and small metal components
Machine Compatibility
Designed for straight die grinders with a compatible 1/4" collet when the complete tool, mandrel, wheel, speed, and guarding setup is appropriate for bonded abrasive cutting.
Compatible examples include:
Benchmark Abrasives Straight Pneumatic Die Grinder
Other compatible straight die grinders with a 1/4" collet and appropriate cutting-wheel setup
The BM-M38_1 provides the mechanical connection between the grinder and wheel, but mandrel fit alone does not determine whether a specific wheel is appropriate for a machine. Always verify the wheel diameter, wheel maximum RPM, grinder speed, mounting configuration, and guarding before use.
Compatible Cut-Off Wheels
Use the appropriate mounting option for the wheel arbor:
3/8" mounting option: For Benchmark Abrasives cut-off wheels with a 3/8" arbor
1/4" mounting option: For compatible cut-off wheels with a 1/4" arbor
Always use the mounting head that matches the wheel's arbor exactly.
Safety Tips
Confirm the wheel arbor matches the correct mandrel mounting option before installation.
Never exceed the lower of the mandrel's 25,000 RPM limit and the wheel's maximum RPM.
Use a grinder whose maximum rated speed does not exceed either the wheel or mandrel rating.
Use only wheels suitable for the complete machine and mandrel setup.
Keep all required machine guards in place.
Secure the wheel correctly before operation.
Inspect the mandrel, mounting hardware, and wheel before every use.
Do not use cracked, chipped, damaged, or improperly mounted cut-off wheels.
Use cut-off wheels for edge cutting only unless the exact wheel is specifically approved for another operation.
Wear appropriate eye and face protection, hearing protection, gloves, and other PPE required for the application.
The Benchmark Abrasives BM-M38_1 cut-off wheel mandrel turns compatible straight die grinders into a compact cutting setup for small-diameter bonded abrasive wheels. Its 1/4" shank fits compatible die grinder collets, while the included mounting options allow you to run cut-off wheels with either 3/8" or 1/4" arbors.
This mandrel is the connecting accessory for many of our smaller Type 1 cut-off wheels, giving fabricators, mechanics, welders, and maintenance professionals a practical way to reach confined areas where a conventional angle grinder is too large. Pair it with the correct Benchmark Abrasives cut-off wheel for tight-access cutting, trimming, fabrication, and repair work.
For an all-Benchmark setup, the BM-M38_1 can be paired with the Benchmark Abrasives straight pneumatic die grinder and compatible 1/4" or 3/8" arbor cut-off wheels. Always match the complete setup to the wheel's diameter and maximum RPM requirements and use appropriate guarding for bonded abrasive cutting.
Quantity: 1 Mandrel
Product Specifications
Specification
Details
Product Type
Cut-Off Wheel Mandrel
Model / SKU
BM-M38_1
Shank Diameter
1/4"
Wheel Arbor Options
1/4" & 3/8"
3/8" Mounting Head
For wheels with 3/8" arbor
1/4" Mounting Head
For wheels with 1/4" arbor
Maximum RPM
25,000
Quantity
1 Mandrel
Product Features
1/4" shank for compatible straight die grinder collets
Mounts cut-off wheels with 3/8" or 1/4" arbors
Two wheel-mounting options in one compact accessory
Ideal for creating a compact straight die grinder cutting setup
Useful for tight-access fabrication, maintenance, and repair work
Compatible with many Benchmark Abrasives small-diameter Type 1 cut-off wheels
Lightweight, straightforward mounting design
Applications
Best For:
Mounting 3/8" arbor cut-off wheels
Mounting 1/4" arbor cut-off wheels
Tight-access metal cutting
Fabrication and welding
Automotive and equipment repair
Maintenance work
Trimming fasteners and small metal components
Machine Compatibility
Designed for straight die grinders with a compatible 1/4" collet when the complete tool, mandrel, wheel, speed, and guarding setup is appropriate for bonded abrasive cutting.
Compatible examples include:
Benchmark Abrasives Straight Pneumatic Die Grinder
Other compatible straight die grinders with a 1/4" collet and appropriate cutting-wheel setup
The BM-M38_1 provides the mechanical connection between the grinder and wheel, but mandrel fit alone does not determine whether a specific wheel is appropriate for a machine. Always verify the wheel diameter, wheel maximum RPM, grinder speed, mounting configuration, and guarding before use.
Compatible Cut-Off Wheels
Use the appropriate mounting option for the wheel arbor:
3/8" mounting option: For Benchmark Abrasives cut-off wheels with a 3/8" arbor
1/4" mounting option: For compatible cut-off wheels with a 1/4" arbor
Always use the mounting head that matches the wheel's arbor exactly.
Safety Tips
Confirm the wheel arbor matches the correct mandrel mounting option before installation.
Never exceed the lower of the mandrel's 25,000 RPM limit and the wheel's maximum RPM.
Use a grinder whose maximum rated speed does not exceed either the wheel or mandrel rating.
Use only wheels suitable for the complete machine and mandrel setup.
Keep all required machine guards in place.
Secure the wheel correctly before operation.
Inspect the mandrel, mounting hardware, and wheel before every use.
Do not use cracked, chipped, damaged, or improperly mounted cut-off wheels.
Use cut-off wheels for edge cutting only unless the exact wheel is specifically approved for another operation.
Wear appropriate eye and face protection, hearing protection, gloves, and other PPE required for the application.
Frequently Asked Questions
The mandrel includes mounting options for cut-off wheels with either a 3/8" or 1/4" arbor.
The BM-M38_1 has a 1/4" shank for compatible straight die grinder collets.
Yes. The BM-M38_1 is the appropriate mandrel for mounting compatible 1/4" or 3/8" arbor cut-off wheels on the Benchmark Abrasives Straight Pneumatic Die Grinder when the complete setup meets the wheel's speed and guarding requirements.
Many of our smaller Type 1 cut-off wheels with 3/8" arbors use the BM-M38_1. Always confirm the arbor size of the specific wheel before mounting.
25,000 RPM. If the wheel has a lower rating, the lower limit applies to the complete setup.
No. Match the wheel diameter to both the machine and mandrel instructions, and use the required guard. A matching arbor size alone does not make every wheel size suitable.
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