3M™ Cubitron™ 3 Flap Disc, 4 1/2 in x 7/8 in, T27, 1169F (10-Pack)
3M™ Cubitron™ 3 Flap Disc, 4 1/2 in x 7/8 in, T27, 1169F (10-Pack)
Roll over image to zoom in Click on image to zoom
3M™ Cubitron™ 3 Flap Disc, 4 1/2 in x 7/8 in, T27, 1169F (10-Pack)3M™ Cubitron™ 3 Flap Disc, 4 1/2 in x 7/8 in, T27, 1169F (10-Pack)

3M™ Cubitron™ 3 Flap Disc, 4 1/2 in x 7/8 in, T27, 1169F (10-Pack)

Fireball ToolSKU: FB-3M-7100380474-10BDK
Pack: 10pc
Price:
$65 USD $82 USD
4-1/2"
DIAMETER
40+
GRIT
T27
FLAT DISC TYPE
13,300
MAX RPM

Performance vs. Other Discs

FIREBALL TOOL’S OWN INDEPENDENT TESTING — 39 FLAP DISCS, GRAVITY-DROP GRINDING RIG
3M's claim: more material removed vs. 3M Cubitron™ II 969F 40++49%
Fireball's 4 lb cold test: material removed vs. Cubitron™ II (41" vs 19")2.2x
Total material removed vs. average of all 39 discs tested2x+
4 lb Cold Test — Material Removed Over Time
tap the dots
0" 10" 20" 30" 40" 0m 5m 10m 15m 20m Grinding time (minutes) Material removed (in) glazed, 19" still cutting, 41"
2m, 6"
6m, 13.5"
8m, 16"
10m, 17.5"
11.5m, 18.5"
13m, 19"
1m, 3"
8m, 20"
12m, 28"
16m, 35"
20m, 41"
0m, 0" (both)
4m, 10.5" (both)
Cubitron™ 3 Cubitron™ II
Where It Lands Among 39 Discs Tested
tap the dots
0" 10" 20" 30" 40" 50" $0 $5 $10 $15 $20 Cost per disc (USD) Total material removed (in) group average, ~9" Cubitron™ 3 — 47.5"
$4.43, 12.1"
$4.55, 8.2"
$1.59, 8.3"
$10.17, 12.8"
$9.85, 11.8"
$7.16, 11"
$1.50, 13.2"
$7.63, 12.7"
$1.60, 2"
$1.76, 7.1"
$6.78, 9.8"
$7.69, 6.9"
$6.80, 12"
$2.72, 17.5"
$7.84, 16.3"
$2.89, 5.9"
$4.06, 9.1"
$8.15, 11.5"
$3.62, 5"
$3.31, 15.3"
$2.11, 10.5"
$7.29, 2.6"
$5.70, 16.3"
$2.96, 7.9"
$5.05, 5.8"
$7.59, 9.8"
$0.80, 12.9"
$8.31, 15.1"
$11.55, 12.7"
$6.00, 3.5"
$8.08, 7.1"
$3.60, 3.5"
$1.44, 6.8"
$10.91, 2"
$0.80, 10.2"
$11.56, 13.8"
$2.48, 2.4"
$7.00, 6.4"
$8.20, 47.5"
Cubitron™ 3 in red; the surrounding cloud is a stylized view of the other 38 discs Fireball has run through its testing rig.
8 lb hot test — still cutting aggressively deep into the run, on Fireball's own testing rig.
Mid-cut close-up — the flap disc at work during the 4 lb hot test.
Precision-Shaped Grain — the curved-side ceramic grain up close, exposing fresh cutting points as it wears.
Fresh off the rig — the 3M™ Cubitron™ 3 1169F flap disc among Fireball's other 38 tested discs.
Under Fireball's toughest test condition (8 lb load, added heat), the Cubitron™ 3 ran the full 20 minutes and removed nearly 90" of material — about 3x the scale of Fireball's original test graph — while the Cubitron™ II burned up around the 4-minute mark.

Features & Benefits

Precision-Shaped Grain with curved sides continuously fractures into new sharp points, exposing fresh mineral for a consistent, aggressive cut through the full life of the disc.
Individual flap construction breaks down evenly, delivering longer, more consistent performance than solid abrasive discs.
Removes up to 49% more material than 3M's previous-generation Cubitron™ II 969F 40+ on carbon steel -- a claim Fireball Tool's own independent testing confirmed and, in several test conditions, exceeded.
Across 39 flap discs on Fireball's testing rig (ranging $2–$20+ per disc), the Cubitron™ 3 removed more than double the average material of the group tested -- outperforming several discs that cost 2–3x as much.
Built-in grinding aid formulated for stainless steel and heat-sensitive alloys — contaminant-free and INOX compliant.
Tough polyester backing resists tearing under heavy grinding pressure.

Recommended Applications

Weld grinding, beveling, deburring, blending, finishing, surface preparation, scale and weld-spatter removal, and edge/contour work on:
Carbon Steel
Stainless Steel
Heat-Sensitive Alloys
Good to know: this is a genuinely aggressive, high-removal-rate disc. Fireball's own testing found it excels at medium-to-heavy pressure grinding where fast material removal is the goal; for very light-pressure or fine-finish work, a less aggressive disc may suit the job better.

Full Specifications

Brand / Line
3M™ Cubitron™ 3
3M Product Number
1169F
3M ID / UPC
7100380474 / 00068060118226
Overall Diameter
4-1/2 in (114.3 mm)
Center Hole (Arbor)
7/8 in (22.23 mm)
Grit
40+ (coarse)
Disc Type / Shape
T27 – Flat (for grinding angles 0°–15°)
Abrasive Mineral
Alumina zirconia — 3M Precision-Shaped Grain, curved-side design
Backing Material
Durable polyester
Max Operating Speed
13,300 RPM / 80 m/s
Pack Quantity
10 discs per pack
Country of Origin
Made in USA with globally sourced materials
Performance figures above are drawn from 3M's published claim and from Fireball Tool's own independent grinding-rig testing (see our video review, "Is 3M Letting Welders Down With This New Disc?"), not third-party lab certification.

You may also like

Recently viewed