Flap Discs - Welding and Fabrication

Flap discs are coated-abrasive grinding and finishing tools used in shipyards, onboard workshops, and marine fabrication. They are suitable for weld blending, edge preparation, rust removal, and surface finishing on steel, stainless steel, and aluminum.

ProShipWorks provides end-to-end support to source and supply Flap Discs for marine vessels, ship operators, industrial facilities, maintenance teams and procurement departments.

Last updated: October 11, 2026

Product Information

Product Name	Flap Discs
Product Category	Welding and Fabrication
Product Reference	1258
Brands / Manufacturers	3M, Norton, Klingspor, PFERD, TYROLIT
Unit of Measure	Piece

Key Features

Key Feature
1. Layered abrasive flaps provide grinding and finishing in one operation
2. Available with zirconia alumina or ceramic abrasive grains
3. Commonly supplied in conical Type 29 and flat Type 27 designs
4. Suitable for weld dressing, deburring, and surface preparation
5. Available in multiple diameters, grits, and backing materials

Applications of Flap Discs

Application
1. Grinding and blending marine structural welds
2. Removing rust, scale, paint, and surface defects
3. Preparing steel, stainless steel, and aluminum surfaces for coating or welding

Models & Manufacturers

Model	Manufacturer
Cubitron II Flap Disc 967A	3M
Blaze R980P Flap Disc	Norton
SMT 850 plus	Klingspor
POLIFAN Z SG	PFERD
Lamel Disc Premium	TYROLIT

Technical Specifications

Model	Specification	Value	Unit
Cubitron II Flap Disc 967A	Abrasive grain	Precision-shaped ceramic alumina	—
Blaze R980P Flap Disc	Abrasive grain	Ceramic alumina	—
SMT 850 plus	Abrasive grain	Zirconia alumina	—
POLIFAN Z SG	Abrasive grain	Ceramic alumina	—
General marine flap disc	Common diameters	100, 115, 125, flap discs	mm
General marine flap disc	Common grits	40, 60, 80, 120	—
General marine flap disc	Mounting thread	22.23 mm bore or M14 threaded hub, depending on design	—

Standards, Certifications & Class Approval

Review the available standards and approval information relevant to the product. Actual certification, material traceability, inspection and classification requirements depend on the product type, intended application and purchasing specification.

Applicable Standards & Certification	Flap discs are commonly manufactured and tested in accordance with EN 13743 for coated abrasive products on backing. ANSI B7.7 may apply in North American markets. The exact standard depends on the manufacturer and supply region.
Class Approval	Flap discs are generally consumable workshop tools and do not normally carry separate DNV, ABS, Lloyd's Register, BV, or ClassNK type approval. Shipyard and vessel use should follow the equipment maker's requirements and applicable safety procedures.

Installation, Maintenance & Safety Information

Installation Notes	Select the correct disc diameter, abrasive type, grit, bore, and maximum RPM for the angle grinder. Fit the disc in the specified direction if marked, tighten the flange correctly, and verify that the grinder guard is installed. Do not exceed the disc's marked maximum speed.
Maintenance Tips	Store discs dry and flat or in their original packaging, away from moisture, heat, and chemicals. Inspect before use for damaged flaps, cracks, deformation, or a damaged backing. Replace worn or contaminated discs and do not dress or modify them.
Safety Notes	Wear eye and face protection, hearing protection, gloves, safety footwear, and suitable respiratory protection. Use the correct guard and maintain a firm two-handed grip. Keep personnel clear of sparks and workpiece fragments, and remove combustible materials from the work area.