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Product materials
and grades

API standard and other materials, each identified by API symbol with stated ball and seat hardness. Select a family to see full specifications.

Ball: 52 – 56
Seat: 52 – 56

Stainless Steel

API A1 — the standard corrosion-resistant ball and seat material.

B1B2

Ball: 53 – 63 RC
Seat: 50 – 57 RC

API B1/B2 — cast or powder metal, for wear and corrosion service.

Ball: 88 – 89.0 RA
Seat: 88.0 – 89.5 RA

API C1 — tungsten carbide with a cobalt binder.

Ball: 89 – 90.5 RA
Seat: 87.5 – 89 RA

API C2 — tungsten carbide with a nickel binder.

Ball: 89.0 – 90.5 RA
Seat: Not offered

API C3 — tungsten and titanium carbide with a cobalt binder. Ball only.

Si3N4

Hardness: 88.0 – 89.0 RA

Non-metallic ceramic ball and seat material.

Mg-PSZ

Hardness: 80 – 84 RA

Magnesia partially-stabilized zirconia ceramic.

Call the sales desk with your application and size — we will match the material and quote it on the spot.