Klingspor SMT 624 Supra Flap Disc 120 Grit | 125mm x 22.23mm | 322776 | Box of 5

Professional Zirconia Alumina P120 Flap Discs for Fine Grinding, Weld Blending and Surface Finishing on Steel & Stainless Steel

Supply Solutions Group supplies Klingspor SMT 624 Supra Flap Discs – 120 Grit – 125mm x 22.3mm – Box of 5 (322776) for fabrication, welding, engineering, mining, construction, manufacturing, maintenance and professional metalworking applications throughout Australia.

The Klingspor SMT 624 Supra is a professional abrasive mop/flap disc designed for grinding and finishing steel and stainless steel. The P120 version is one of the finer grades in the SMT 624 range, making it particularly useful for surface refinement, fine weld blending and reducing scratch patterns left by coarser abrasives.

Catalogue number 322776 is the:

125mm Diameter × 22.23mm Bore × P120 Grit

version of the SMT 624 Supra.

Klingspor specifies the disc with zirconia alumina abrasive grain, a glass-fibre backing plate and a 12° convex design. The manufacturer rates catalogue number 322776 to a maximum peripheral speed of 80m/s and maximum rotational speed of 12,250 RPM.

The P120 grit provides a finer abrasive action than the P40, P60 and P80 variants, making it well suited to applications where surface quality and controlled material removal are more important than aggressive stock removal.

This Supply Solutions Group listing contains:

1 Box × 5 Klingspor SMT 624 Supra P120 Flap Discs – 125mm x 22.3mm – 322776.

As an Indigenous-owned industrial supplier and procurement partner, Supply Solutions Group provides Klingspor abrasives, flap discs, cutting wheels, grinding discs, spindle flap wheels, surface-conditioning products, PPE and industrial consumables backed by responsive customer service, procurement support and Australia-wide business supply capability.

Product Type

• Product Type: Abrasive Flap Disc / Abrasive Mop Disc

• Brand: Klingspor

• Series: SMT 624 Supra

• Catalogue Number: 322776

• Performance Class: Supra

• Abrasive Grain: Zirconia Alumina

• Grit: P120 / 120 Grit

• Diameter: 125mm

• Bore: 22.23mm

• Commercial Bore Description: 22.3mm

• Design: Convex

• Convex Angle: 12°

• Backing Plate: Glass Fibre

• Maximum Speed: 12,250 RPM

• Maximum Peripheral Speed: 80m/s

• Suitable Materials: Steel & Stainless Steel

• Supply Solutions Group Pack Quantity: 5 Discs

Key Features

• Genuine Klingspor abrasive product

• SMT 624 Supra professional range

• Catalogue number 322776

• Fine P120 abrasive grade

• 125mm diameter

• 22.23mm manufacturer-specified bore

• Zirconia alumina abrasive grain

• Glass-fibre backing plate

• 12° convex design

• Controlled material removal

• Fine surface refinement

• Suitable for weld blending

• Suitable for smoothing grinding marks

• Suitable for edge finishing

• Suitable for surface preparation

• Suitable for steel

• Suitable for stainless steel

• Maximum 12,250 RPM

• Maximum peripheral speed 80m/s

• Box of 5

Technical Specifications

Specification	Details
Brand	Klingspor
Product	Abrasive Mop / Flap Disc
Series	SMT 624 Supra
Catalogue Number	322776
Performance Class	Supra
Abrasive Grain	Zirconia Alumina
Grit	P120
Diameter	125mm
Bore	22.23mm
Commercial Bore Description	22.3mm
Design	Convex
Convex Angle	12°
Backing Plate	Glass Fibre
Maximum Peripheral Speed	80m/s
Maximum RPM	12,250 RPM
Suitable for Steel	Yes
Suitable for Stainless Steel	Yes
Supply Solutions Group Pack	5 Discs

Klingspor identifies the SMT 624 Supra as a zirconia alumina abrasive mop disc with a glass-fibre backing plate for demanding grinding applications on steel and stainless steel.

Typical Applications

• Fine weld blending

• Weld seam refinement

• Surface finishing

• Surface preparation

• Refining P40, P60 or P80 grinding marks

• Edge finishing

• Light grinding

• Steel fabrication

• Stainless-steel fabrication

• Metal finishing

• Fabrication repairs

• Preparing surfaces before coating

• Preparing components for finer finishing

• General workshop maintenance

Suitable Industries

• Welding and fabrication

• Engineering

• Mining and resources

• Construction

• Manufacturing

• Stainless-steel fabrication

• Structural steel

• Metal fabrication

• Industrial maintenance

• Automotive

• Transport

• Infrastructure

• Utilities

• Mechanical workshops

• Trades and contracting

Why Choose Klingspor SMT 624 Supra 120 Grit?

The SMT 624 Supra P120 is particularly useful when a finer finish and controlled abrasive action are required.

Compared with coarser SMT 624 grades, P120 removes material more gradually and leaves a finer scratch pattern.

This makes it suitable for:

• Final-stage flap-disc finishing

• Refining welds

• Smoothing surfaces after coarser grinding

• Preparing metal before coating

• Improving surface consistency

• Light edge finishing

The SMT 624 combines this finer abrasive grade with Klingspor's professional Supra-class flap-disc construction.

Zirconia Alumina Abrasive Grain

The SMT 624 uses:

Zirconia Alumina

abrasive grain.

Zirconia alumina is designed for demanding metalworking applications and provides a useful combination of cutting performance and abrasive service life.

The SMT 624 is specifically suited to:

Steel and Stainless Steel.

P120 Fine Grit

Catalogue number 322776 uses:

P120 Grit

making it the finest commonly listed grit in the 125mm SMT 624 Supra range.

P120 is particularly useful for:

• Fine surface refinement

• Smoothing previous abrasive scratches

• Weld blending

• Light deburring

• Preparing surfaces before painting or coating

• Finishing fabricated components

It is intended for substantially finer work than coarse P40 or P60 abrasives.

Comparing SMT 624 Grits

The appropriate grit depends on the required removal rate and finish:

Grit	Typical Use
P40	Aggressive grinding and heavy stock removal
P60	General grinding and intermediate blending
P80	Surface refinement and weld blending
P120	Fine finishing and final surface refinement

A progressive abrasive sequence can be used where a workpiece requires both significant initial material removal and a finer final finish.

125mm Diameter

Each disc measures:

125mm Diameter

making it suitable for compatible 125mm angle grinders.

The grinder must operate within the disc's rated speed and use the correct mounting arrangement.

22.23mm Bore

Klingspor's precise bore specification is:

22.23mm

while the product is commonly commercially described as:

22.3mm.

The two descriptions refer to the same nominal grinder mounting size in this listing.

Always confirm compatibility with the intended grinder before use.

12° Convex Design

The SMT 624 Supra uses a:

12° Convex Profile.

A convex flap disc concentrates abrasive contact compared with a flat configuration, making the format particularly useful for processing:

• Weld seams

• Edges

• Bevelled surfaces

• Fabricated joints

• Smaller contact areas

With the P120 abrasive grade, this geometry combines controlled finishing with the accessibility of a convex disc.

Glass-Fibre Backing Plate

The SMT 624 uses a:

Glass-Fibre Backing Plate.

The backing plate supports the overlapping abrasive flaps and provides stability during grinding and finishing operations.

Fine Weld Blending

The P120 version is particularly useful when welds have already undergone heavier grinding.

For example, a fabrication process may progress through:

P40 → P60 → P80 → P120

depending on the initial condition of the weld and required final surface.

Not every application requires every grit. The appropriate abrasive sequence depends on material, surface condition and required finish.

Surface Refinement

Where aggressive stock removal is no longer required, P120 allows the operator to focus on improving the surface.

Typical applications include:

• Reducing visible grinding scratches

• Blending adjoining surfaces

• Refining welded joints

• Preparing surfaces for subsequent finishing

• Producing a more consistent appearance

Steel Applications

The SMT 624 Supra is suitable for:

Steel.

Typical steel applications include:

• Fabricated components

• Welded assemblies

• Structural steel

• Plate

• Profiles

• General workshop components

Stainless Steel Applications

Klingspor also specifies the SMT 624 Supra for:

Stainless Steel.

Typical uses include weld blending, edge refinement and general surface finishing.

Where cross-contamination is a concern, dedicated abrasives and tools should be maintained according to workplace stainless-steel fabrication procedures.

Maximum 12,250 RPM

For the 125mm SMT 624 Supra, the maximum operating speed is:

12,250 RPM

with a maximum peripheral speed of:

80m/s.

Never operate an abrasive disc above its marked maximum permissible speed.

Angle Grinder Compatibility

The SMT 624 Supra 125 x 22.23mm is intended for compatible angle-grinder applications.

Before mounting, confirm:

• 125mm grinder capacity

• Bore and spindle compatibility

• Correct flange arrangement

• Grinder speed

• Guard installation

• Disc condition

Always follow both the abrasive manufacturer's and power-tool manufacturer's operating instructions.

Box of 5

This Supply Solutions Group listing contains:

5 × Klingspor SMT 624 Supra P120 Flap Discs – 322776.

The five-disc configuration provides a practical procurement quantity for:

• Fabrication workshops

• Engineering departments

• Maintenance crews

• Mobile tradespeople

• Manufacturing facilities

• Site stores

Higher quantities can be arranged for regular industrial consumption.

Safety Considerations

Powered grinding can generate:

• Sparks

• Metal particles

• Abrasive fragments

• Dust

• Heat

• Significant noise

Appropriate workplace controls and PPE should be selected according to the task.

PPE may include:

• Safety glasses or goggles

• Face protection

• Hearing protection

• Appropriate gloves

• Protective clothing

• Safety footwear

• Respiratory protection where required

Always inspect abrasive products before use and follow the manufacturer's safety instructions.

Storage & Handling

For best abrasive condition:

• Store in a clean, dry environment

• Protect from moisture

• Avoid excessive heat

• Do not bend or crush discs

• Keep discs appropriately packaged

• Inspect before mounting

• Never use visibly damaged abrasive products

• Follow Klingspor's storage and handling recommendations

Why Buy from Supply Solutions Group?

Supply Solutions Group supplies professional abrasives, grinding products, fabrication supplies, PPE and industrial consumables to organisations throughout Australia.

Benefits of Partnering with Supply Solutions Group

• Australia-wide business supply capability

• Indigenous-owned business

• Klingspor abrasives

• SMT 624 Supra flap discs

• Zirconia alumina abrasives

• P40, P60, P80 and P120 finishing options

• Cutting discs

• Grinding discs

• Spindle flap wheels

• Surface-conditioning products

• Sanding products

• Welding consumables

• Fabrication supplies

• Angle-grinder accessories

• Safety eyewear

• Face protection

• Hearing protection

• Respiratory PPE

• Mining consumables

• Construction supplies

• Manufacturing supplies

• Industrial consumables

• Procurement consolidation

• Trade account options

• Bulk purchasing solutions

• Product sourcing assistance

• Responsive customer service

• Recurring commercial supply arrangements

Frequently Asked Questions

What is Klingspor 322776?
It is the Klingspor SMT 624 Supra P120 flap disc measuring 125mm x 22.23mm.

What grit is catalogue number 322776?
P120 / 120 grit.

What size is the disc?
125mm diameter x 22.23mm bore.

Why is the listing described as 22.3mm?
22.3mm is a rounded commercial description of the 22.23mm nominal bore.

What abrasive grain does the SMT 624 Supra use?
Zirconia alumina.

What backing plate does it use?
Glass fibre.

What is P120 suitable for?
P120 is particularly suited to fine surface refinement, weld blending, reducing coarser abrasive marks and preparing metal for subsequent finishing.

Is P120 finer than P80?
Yes. P120 produces a finer scratch pattern and generally removes material less aggressively than P80.

Is P120 finer than P60?
Yes.

Is P120 finer than P40?
Yes. P120 is substantially finer than P40.

Is it suitable for aggressive weld removal?
P120 is primarily a finishing grade. For substantial weld or stock removal, a coarser grade such as P40 or P60 would generally be more appropriate.

Is it suitable for steel?
Yes. Klingspor specifies the SMT 624 Supra for steel.

Is it suitable for stainless steel?
Yes.

Can it be used for weld blending?
Yes. The P120 grade is particularly useful for fine weld-area refinement after heavier grinding has been completed.

Is the SMT 624 Supra convex?
Yes. It uses a convex configuration.

What is the convex angle?
12°.

What is the maximum operating speed?
12,250 RPM / 80m/s.

How many discs are included in this listing?
5 discs.

Is 322776 part of the same range as 322772, 322774 and 322775?
Yes. These catalogue numbers are part of the 125 x 22.23mm SMT 624 Supra range:

• 322772 – P40

• 322774 – P60

• 322775 – P80

• 322776 – P120

Which SMT 624 grit is best for heavy material removal?
A coarse grade such as P40 is better suited to aggressive stock removal than P120.

Which SMT 624 grit is best for finer finishing?
Of the P40, P60, P80 and P120 options, P120 provides the finest finish.

Can Supply Solutions Group provide multiple SMT 624 grit grades?
Yes. Supply Solutions Group can assist with different SMT 624 grit grades to support staged grinding and finishing processes.

Can Supply Solutions Group provide bulk or recurring quantities?
Yes. Bulk and ongoing procurement arrangements are available for fabricators, manufacturers, engineering workshops, mine sites, construction businesses and industrial maintenance operations.