100-Piece 4-1/2" T29 High Density Zirconia Flap Disc Bundle + FREE Angle Grinder
Holiday Bundle — Get the $83.99 Benchmark Abrasives 4-1/2" Angle Grinder FREE
Stock the shop with 100 of our premium 4-1/2" x 7/8" T29 high density zirconia flap discs and get the Benchmark Abrasives 4-1/2" Corded Angle Grinder to run them FREE. This limited holiday bundle includes four essential grits for everything from aggressive stock removal and weld grinding to blending and finer surface finishing — all at the same price as the 100 flap discs alone.
The bundle includes 30 discs each in 40, 60, and 80 grit, plus 10 discs in 120 grit, giving you a practical assortment for multiple stages of grinding and finishing. These High Density flap discs are manufactured with premium European zirconia abrasive cloth and contain approximately 40% more abrasive material than our regular-density flap discs. The thicker Jumbo construction provides increased usable abrasive while the layered flap design continually exposes fresh zirconia grain as the disc wears.
The included Benchmark Abrasives 4-1/2" Corded Angle Grinder delivers 11,000 RPM from a powerful 7-amp motor, giving you a complete grinding system ready for fabrication, weld cleanup, bead grinding, blending, shaping, and finishing right out of the box.
Holiday Bundle Price: $251.90
Combined Individual Value: $335.89
You Save: $83.99 — The 4-1/2" Angle Grinder Is FREE
Bundle Contents
100 Total High Density Zirconia Flap Discs:
30 × 40 Grit — Aggressive grinding and heavy stock removal
30 × 60 Grit — General-purpose grinding and weld blending
High Density construction provides increased usable abrasive
Layered flap design wears gradually while exposing fresh abrasive
X-weight polycotton backing provides strength and flexibility
13,300 RPM maximum operating speed
T29 angled-face design for efficient grinding on flat surfaces
Designed for use on 4-1/2" and compatible 5" angle grinders
Benchmark Abrasives 4-1/2" Corded Angle Grinder
Powerful 7-amp motor
11,000 RPM operating speed
120V corded design for consistent power
Compact 4-1/2" grinder platform
Standard 5/8"-11 threaded spindle
6.5-foot power cord
Rugged housing for demanding shop and fabrication environments
Compatible with Benchmark Abrasives flap discs, grinding wheels, cut-off wheels, and other properly rated accessories
Spanner wrench and replacement brushes included
Applications & Performance
This holiday bundle is built for welders, fabricators, metalworkers, maintenance departments, automotive professionals, contractors, and anyone who uses flap discs regularly and wants a complete grinding setup with plenty of abrasive inventory on hand.
Zirconia grain is self-sharpening and performs particularly well under the heat and pressure generated during metal grinding. As worn abrasive fractures away, fresh cutting edges are exposed to maintain consistent performance.
T29 Angled Face — When Should I Use It?
These flap discs use a T29 angled-face profile.
T29 flap discs are preferred for grinding broad, flat surfaces because the angled flap arrangement lets the operator approach the workpiece at a more natural grinding angle while maintaining strong abrasive contact.
They are an excellent choice for:
Grinding bead welds
Flat plate fabrication
Removing weld buildup
Beveling edges
Heavy stock removal
Blending flat welded assemblies
Surface preparation on flat steel
General fabrication work
For contoured, curved, or non-flat surfaces such as fence posts, pipe, tubing, gates, and railings, a T27 flat-face flap disc is typically the better choice.
Materials
Steel, Iron & Specialty Alloys
Cast Iron
Steel
Stainless Steel
Titanium
Nickel Alloys
Wrought Iron
Non-Ferrous Metals
Copper
Other Materials
Fiberglass
Plastic
Hard Rubber
Wood
Stone
Machine Compatibility
The grinder you need is included with this bundle.
Compatible examples include:
Benchmark Abrasives 4-1/2" Corded Angle Grinder — INCLUDED FREE
Compatible 4-1/2" angle grinders
Compatible 5" angle grinders using a 7/8" arbor mounting system
The flap discs are rated to a maximum of 13,300 RPM, while the included Benchmark Abrasives grinder operates at 11,000 RPM, keeping the machine within the rated operating speed of the discs.
The flap discs use a 7/8" arbor opening and mount using the grinder's appropriate backing flange and retaining nut.
Keep all machine guards properly installed and positioned during use.
Inspect flap discs before each use. Do not use discs that are damaged, cracked, excessively worn, wet, or otherwise compromised.
Confirm that the flap disc's maximum RPM meets or exceeds the operating speed of the grinder.
Never exceed the flap disc's 13,300 RPM maximum speed.
Disconnect the grinder from its power source before installing, removing, or changing flap discs.
Make sure the flap disc is properly seated and securely mounted before operation.
Allow the grinder to reach full operating speed before contacting the workpiece.
Maintain control of the grinder with both hands during operation.
Use moderate pressure and allow the abrasive to perform the cutting.
Excessive pressure can generate unnecessary heat, increase wear, and reduce grinding efficiency.
For lighter stock removal or finer blending, use a lighter touch or feathered grinding approach.
Direct sparks and grinding debris away from yourself, other people, and combustible materials.
Use these flap discs for dry applications only.
Read and follow the grinder manufacturer's operating and safety instructions before use.
Frequently Asked Questions
Yes. During this holiday promotion, you pay the selling price of the 100 High Density Zirconia Flap Discs and receive the Benchmark Abrasives 4-1/2" Corded Angle Grinder at no additional cost.
The bundle contains 100 total flap discs:
30 × 40 Grit
30 × 60 Grit
30 × 80 Grit
10 × 120 Grit
This gives you a useful assortment covering aggressive stock removal through finer blending and finishing.
The assortment is based on the same proven grit mix used in our mixed-grit High Density Zirconia Flap Disc pack.
The heavier concentration of 40, 60, and 80 grit gives you more discs for the grinding and blending stages where flap discs typically see the most use, while still providing 120 grit for finer finishing work.
No. These are our High Density / Jumbo Zirconia Flap Discs.
They contain approximately 40% more abrasive material than our regular-density flap discs, creating a thicker disc with more usable abrasive for extended grinding life.
Zirconia is a durable, self-sharpening abrasive grain designed to perform well under the heat and pressure generated during grinding.
As the abrasive wears, the zirconia grain fractures to expose fresh cutting edges, helping maintain consistent stock removal throughout the life of the disc.
40 grit provides the most aggressive material removal in the bundle.
60 grit delivers strong cutting action with improved control and is an excellent general-purpose grinding grit.
80 grit provides smoother blending and surface refinement.
120 grit produces the finest finish in the bundle and is intended for lighter blending and finishing.
The T29 design has an angled face that helps the operator approach broad, flat surfaces more ergonomically.
This makes T29 flap discs particularly effective for grinding bead welds, blending flat welded assemblies, beveling, and performing heavy stock removal on flat metal surfaces.
T29 flap discs have an angled face and are generally preferred for broad, flat surfaces such as plate steel and bead welds.
T27 flap discs have a flatter profile and are generally preferred for contoured or non-flat surfaces such as pipe, tubing, fence posts, gates, railings, and similar shapes.
Yes. The 4-1/2" x 7/8" flap discs are compatible with the included Benchmark Abrasives 4-1/2" Corded Angle Grinder when properly mounted using the grinder's flange and retaining nut.
Yes. The included grinder operates at 11,000 RPM, while the flap discs are rated for a maximum speed of 13,300 RPM.
Yes, if the grinder is approved for 4-1/2" flap discs, has the correct guard and 7/8" bore mounting hardware, and has a maximum no-load speed no higher than 13,300 RPM. Check the tool instructions before using them on a 5" grinder.
The Benchmark Abrasives 4-1/2" Corded Angle Grinder can run a wide range of compatible accessories, including:
Flap discs
Cut-off wheels
Grinding wheels
Surface preparation wheels
Stripping products
Wire wheels and brushes
Other properly sized and speed-rated angle grinder accessories
Match the accessory diameter, mounting hardware, guard, and maximum RPM to the grinder and its operating instructions.
Yes. This is a limited holiday bundle, combining 100 T29 High Density Zirconia Flap Discs with a FREE Benchmark Abrasives 4-1/2" Corded Angle Grinder while the promotion is available.
100-Piece 4-1/2" T29 High Density Zirconia Flap Disc Bundle + FREE Angle Grinder
Holiday Bundle — Get the $83.99 Benchmark Abrasives 4-1/2" Angle Grinder FREE
Stock the shop with 100 of our premium 4-1/2" x 7/8" T29 high density zirconia flap discs and get the Benchmark Abrasives 4-1/2" Corded Angle Grinder to run them FREE. This limited holiday bundle includes four essential grits for everything from aggressive stock removal and weld grinding to blending and finer surface finishing — all at the same price as the 100 flap discs alone.
The bundle includes 30 discs each in 40, 60, and 80 grit, plus 10 discs in 120 grit, giving you a practical assortment for multiple stages of grinding and finishing. These High Density flap discs are manufactured with premium European zirconia abrasive cloth and contain approximately 40% more abrasive material than our regular-density flap discs. The thicker Jumbo construction provides increased usable abrasive while the layered flap design continually exposes fresh zirconia grain as the disc wears.
The included Benchmark Abrasives 4-1/2" Corded Angle Grinder delivers 11,000 RPM from a powerful 7-amp motor, giving you a complete grinding system ready for fabrication, weld cleanup, bead grinding, blending, shaping, and finishing right out of the box.
Holiday Bundle Price: $251.90
Combined Individual Value: $335.89
You Save: $83.99 — The 4-1/2" Angle Grinder Is FREE
Bundle Contents
100 Total High Density Zirconia Flap Discs:
30 × 40 Grit — Aggressive grinding and heavy stock removal
30 × 60 Grit — General-purpose grinding and weld blending
High Density construction provides increased usable abrasive
Layered flap design wears gradually while exposing fresh abrasive
X-weight polycotton backing provides strength and flexibility
13,300 RPM maximum operating speed
T29 angled-face design for efficient grinding on flat surfaces
Designed for use on 4-1/2" and compatible 5" angle grinders
Benchmark Abrasives 4-1/2" Corded Angle Grinder
Powerful 7-amp motor
11,000 RPM operating speed
120V corded design for consistent power
Compact 4-1/2" grinder platform
Standard 5/8"-11 threaded spindle
6.5-foot power cord
Rugged housing for demanding shop and fabrication environments
Compatible with Benchmark Abrasives flap discs, grinding wheels, cut-off wheels, and other properly rated accessories
Spanner wrench and replacement brushes included
Applications & Performance
This holiday bundle is built for welders, fabricators, metalworkers, maintenance departments, automotive professionals, contractors, and anyone who uses flap discs regularly and wants a complete grinding setup with plenty of abrasive inventory on hand.
Zirconia grain is self-sharpening and performs particularly well under the heat and pressure generated during metal grinding. As worn abrasive fractures away, fresh cutting edges are exposed to maintain consistent performance.
T29 Angled Face — When Should I Use It?
These flap discs use a T29 angled-face profile.
T29 flap discs are preferred for grinding broad, flat surfaces because the angled flap arrangement lets the operator approach the workpiece at a more natural grinding angle while maintaining strong abrasive contact.
They are an excellent choice for:
Grinding bead welds
Flat plate fabrication
Removing weld buildup
Beveling edges
Heavy stock removal
Blending flat welded assemblies
Surface preparation on flat steel
General fabrication work
For contoured, curved, or non-flat surfaces such as fence posts, pipe, tubing, gates, and railings, a T27 flat-face flap disc is typically the better choice.
Materials
Steel, Iron & Specialty Alloys
Cast Iron
Steel
Stainless Steel
Titanium
Nickel Alloys
Wrought Iron
Non-Ferrous Metals
Copper
Other Materials
Fiberglass
Plastic
Hard Rubber
Wood
Stone
Machine Compatibility
The grinder you need is included with this bundle.
Compatible examples include:
Benchmark Abrasives 4-1/2" Corded Angle Grinder — INCLUDED FREE
Compatible 4-1/2" angle grinders
Compatible 5" angle grinders using a 7/8" arbor mounting system
The flap discs are rated to a maximum of 13,300 RPM, while the included Benchmark Abrasives grinder operates at 11,000 RPM, keeping the machine within the rated operating speed of the discs.
The flap discs use a 7/8" arbor opening and mount using the grinder's appropriate backing flange and retaining nut.
Keep all machine guards properly installed and positioned during use.
Inspect flap discs before each use. Do not use discs that are damaged, cracked, excessively worn, wet, or otherwise compromised.
Confirm that the flap disc's maximum RPM meets or exceeds the operating speed of the grinder.
Never exceed the flap disc's 13,300 RPM maximum speed.
Disconnect the grinder from its power source before installing, removing, or changing flap discs.
Make sure the flap disc is properly seated and securely mounted before operation.
Allow the grinder to reach full operating speed before contacting the workpiece.
Maintain control of the grinder with both hands during operation.
Use moderate pressure and allow the abrasive to perform the cutting.
Excessive pressure can generate unnecessary heat, increase wear, and reduce grinding efficiency.
For lighter stock removal or finer blending, use a lighter touch or feathered grinding approach.
Direct sparks and grinding debris away from yourself, other people, and combustible materials.
Use these flap discs for dry applications only.
Read and follow the grinder manufacturer's operating and safety instructions before use.
Frequently Asked Questions
Yes. During this holiday promotion, you pay the selling price of the 100 High Density Zirconia Flap Discs and receive the Benchmark Abrasives 4-1/2" Corded Angle Grinder at no additional cost.
The bundle contains 100 total flap discs:
30 × 40 Grit
30 × 60 Grit
30 × 80 Grit
10 × 120 Grit
This gives you a useful assortment covering aggressive stock removal through finer blending and finishing.
The assortment is based on the same proven grit mix used in our mixed-grit High Density Zirconia Flap Disc pack.
The heavier concentration of 40, 60, and 80 grit gives you more discs for the grinding and blending stages where flap discs typically see the most use, while still providing 120 grit for finer finishing work.
No. These are our High Density / Jumbo Zirconia Flap Discs.
They contain approximately 40% more abrasive material than our regular-density flap discs, creating a thicker disc with more usable abrasive for extended grinding life.
Zirconia is a durable, self-sharpening abrasive grain designed to perform well under the heat and pressure generated during grinding.
As the abrasive wears, the zirconia grain fractures to expose fresh cutting edges, helping maintain consistent stock removal throughout the life of the disc.
40 grit provides the most aggressive material removal in the bundle.
60 grit delivers strong cutting action with improved control and is an excellent general-purpose grinding grit.
80 grit provides smoother blending and surface refinement.
120 grit produces the finest finish in the bundle and is intended for lighter blending and finishing.
The T29 design has an angled face that helps the operator approach broad, flat surfaces more ergonomically.
This makes T29 flap discs particularly effective for grinding bead welds, blending flat welded assemblies, beveling, and performing heavy stock removal on flat metal surfaces.
T29 flap discs have an angled face and are generally preferred for broad, flat surfaces such as plate steel and bead welds.
T27 flap discs have a flatter profile and are generally preferred for contoured or non-flat surfaces such as pipe, tubing, fence posts, gates, railings, and similar shapes.
Yes. The 4-1/2" x 7/8" flap discs are compatible with the included Benchmark Abrasives 4-1/2" Corded Angle Grinder when properly mounted using the grinder's flange and retaining nut.
Yes. The included grinder operates at 11,000 RPM, while the flap discs are rated for a maximum speed of 13,300 RPM.
Yes, if the grinder is approved for 4-1/2" flap discs, has the correct guard and 7/8" bore mounting hardware, and has a maximum no-load speed no higher than 13,300 RPM. Check the tool instructions before using them on a 5" grinder.
The Benchmark Abrasives 4-1/2" Corded Angle Grinder can run a wide range of compatible accessories, including:
Flap discs
Cut-off wheels
Grinding wheels
Surface preparation wheels
Stripping products
Wire wheels and brushes
Other properly sized and speed-rated angle grinder accessories
Match the accessory diameter, mounting hardware, guard, and maximum RPM to the grinder and its operating instructions.
Yes. This is a limited holiday bundle, combining 100 T29 High Density Zirconia Flap Discs with a FREE Benchmark Abrasives 4-1/2" Corded Angle Grinder while the promotion is available.
SHIPPING
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You read that right, Free shipping on orders over $100 + Orders placed before 12 noon PST = SHIP SAME DAY!
Orders placed after noon will ship the following day.
Standard FREE shipping is UPS Ground or USPS priority depending on size and weight. Most customers receive
their order within 3-5 days from date of purchase. Faster shipping options available for additional charge.
Free shipping not available on international orders. Free shipping will only be available to orders being
delivered within the lower 48 states.
Refund
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