APS BlackSteel brake discs are state-of-the-art CNC machined from a one-piece forging.
When the metal is forged, it creates a directional grain flow that follows the contour of the disc. This allows for a much stronger disc that has a reduced risk of the cracking and catastrophic failures associated with inferior welded designs.

The APS proprietary heat treatment has a two-fold purpose. The heat treatment strengthens the steel by bonding the carbon, oxygen and nitrogen in the top layer of the metal. This is not a coating that can wear off, as the steel itself is transformed. The heat treatment gives the steel its black appearance and provides the surface with a high resistance to the corrosion and oxidation associated with the extreme thermal cycling experienced in aircraft braking systems. This makes it an excellent choice for agricultural aircraft that work in a harsh, chemical environment, as well as for anyone who leaves their aircraft outside most of the time.

The APS164-02504 Brake Disc fits the following aircraft:
Cessna:

337 (1965 to 1966, 337-001 thru 337-0525) equipped with 30-61 Brake Assembly
337A (1965 to 1966, 337-001 thru 337-0525) equipped with 30-61 Brake Assembly
337B (1967, 337-0526 thru 337-0619) equipped with 30-61A Brake Assembly
337B thru D (337-0620 thru 337-1193) equipped with 30-61D Brake Assembly
Cirrus Design Corp.:

Sr-22 (1740 and on) equipped with 30-233B Brake Assembly
Columbia Aircraft:

Columbia Model 300 equipped with 30-233A Brake Assembly
Partenavia:

P.68 equipped with 30-61E Brake Assembly
P.68B equipped with 30-61E Brake Assembly
P.68C equipped with 30-61E Brake Assembly
P.68c-TC equipped with 30-61E Brake Assembly
Raytheon Aircraft Company:

G33 (Cd-1272 thru 1304, Ce-301 thru 634, Cj-31 thru 124, d-9193 thru 9861, e-1 thru 824) equipped with 30-54 Brake Assembly
F33A (Cd-1272 thru 1304, Ce-301 thru 634, Cj-31 thru 124, d-9193 thru 9861, e-1 thru 824) equipped with 30-54 Brake Assembly
F33C (Cd-1272 thru 1304, Ce-301 thru 634, Cj-31 thru 124, d-9193 thru 9861, e-1 thru 824) equipped with 30-54 Brake Assembly
V35BTC (Cd-1272 thru 1304, Ce-301 thru 634, Cj-31 thru 124, d-9193 thru 9861, e-1 thru 824) equipped with 30-54 Brake Assembly
36 (Cd-1272 thru 1304, Ce-301 thru 634, Cj-31 thru 124, d-9193 thru 9861, e-1 thru 824) equipped with 30-54 Brake Assembly
76 equipped with 30-54B Brake Assembly
RFB Rhein-Flugzeugbau GmbH:

RFB 400/600 Fantrainer equipped with 30-61E Brake Assembly
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Product Attributes:

Applicable Regions: ALL

Brand: Aviation Products Systems

Bundle Description: N/A

California Prop 65 Warning: N/A

Compatible Make: VARIOUS

Compatible Model: VARIOUS

Country/Region Of Manufacture: United States

Custom Bundle: No

Manufacturer Part Number: APS164-02504

Modification Description: N/A

Weight (lbs.): 750.00 lb

Length (in.): 8

Width (in.): 6

Height (in.): 3