Boride AS-9 Narrow Sharpening Stone Narrow bonded aluminum oxide stone with excellent performance and low loading for sharpening knives on Hapstone sharpeners. Series AS-9 stones AS-9 series stones are made of aluminum oxide and were originally intended for metal treatment after electric spark machining. Performance Low loading Due to their excellent performance and weak loading, AS-9 stones became popular for sharpening knives. Format Narrow 12 mm profile This narrow format is useful for more focused sharpening work while keeping the standard 6 mm abrasive thickness. This offers a longer life cycle. Maintenance Lapping and minor surface marks Boride stones may have saw strokes on the working surface, lacquer residues, or small chips at corners and edges no larger than 1 mm. These minor marks are eliminated during stone preparation. Additional lapping can be performed with loose silicon carbide powder or a diamond lapping plate. Lubricants Use with water or oil-based lubricants Boride stones can be used with water, soapy water, Boride Bori-Lube, or a water solution of dipropylene glycol. WD-40, refined olive oil, and oleic acid are options for experienced users only. Preparation Soak or apply oil lightly When using water, soak the stone for 1–2 minutes. When using oil, apply 1–2 drops to the surface and spread evenly. If the stone absorbs the honing oil, use a larger amount of oil. Specifications Stone size6” × 1/2” × 1/4” (152 × 12 × 6 mm) Total size6.3” × 1/2” × 1/3” (160 × 12 × 9 mm) Weight1.6 oz (83 g) AbrasiveAluminum Oxide BinderVitrified BlankAluminum blank Working withOil Country of originUSA Stone typeStone mounted on a 45° beveled blank .r2-case-apple{color:#191919;line-height:1.5} .r2-case-apple *,.r2-case-apple *::before,.r2-case-apple *::after{box-sizing:border-box;font-family:inherit!important} .r2-case-apple img{display:block;width:100%;height:auto;border:0;border-radius:24px} .r2-case-apple section{margin:0 0 20px} .r2-hero{text-align:center;padding:12px 0 4px} .r2-hero-copy{max-width:760px;margin:0 auto 18px} .r2-hero-media{max-width:520px;margin:0 auto} .r2-hero h1{margin:0 0 12px;font-weight:700;letter-spacing:-0.02em;font-family:'Montserrat',sans-serif!important} @media(min-width:575px){ body .r2-case-apple .r2-hero .r2-hero-copy h1.hero-text{font-size:36px!important;line-height:50px!important} } .r2-subtitle{max-width:720px;margin:0 auto;font-size:19px;line-height:1.4;color:#6e6e73} .r2-case-apple .r2-feature-card p.r2-card-label, .r2-case-apple .r2-split-copy p.r2-card-label, .r2-case-apple .r2-dark-copy p.r2-card-label{ margin:0 0 8px; font-size:12px!important; font-weight:700!important; letter-spacing:.06em!important; text-transform:uppercase; color:#6e6e73!important; font-family:'Montserrat',sans-serif!important; } .r2-card-label.light{color:rgba(255,255,255,.72)!important} .r2-feature-grid{display:grid;gap:16px} .r2-feature-grid-3{grid-template-columns:repeat(3,1fr)} .r2-feature-grid-2{grid-template-columns:repeat(2,1fr)} .r2-feature-card{ background:#f5f5f7; border-radius:24px; padding:24px; } .r2-feature-card h2, .r2-split-copy h2{ margin:0 0 8px; font-size:26px; font-weight:700; padding-bottom:0!important; } .r2-split-copy h2{font-size:28px} .r2-feature-card p, .r2-split-copy p{ margin:0; font-size:16px; line-height:1.45; color:#373e48; } .r2-feature-card p + p, .r2-split-copy p + p{margin-top:10px} .r2-split{ display:grid; grid-template-columns:1fr; gap:24px; align-items:center; background:#fbfbfd; border-radius:28px; padding:28px; } .r2-split-media{max-width:420px;margin:0 auto} .r2-dark-card{background:#191919;color:#fff;border-radius:28px;padding:28px} .r2-dark-card-soft{border-radius:32px} .r2-dark-copy{margin-bottom:18px} .r2-spec-grid{display:grid;gap:16px} .r2-spec-grid-2{grid-template-columns:repeat(2,1fr)} .r2-spec-item{ background:rgba(255,255,255,.06); border-radius:18px; padding:18px; } .r2-spec-lines{ display:flex; flex-direction:column; gap:8px; } .r2-spec-lines div{ display:flex; justify-content:space-between; align-items:flex-start; gap:12px; } .r2-spec-lines span{ font-size:13px; line-height:1.4; color:rgba(255,255,255,.75); white-space:nowrap; flex:0 0 auto; } .r2-spec-lines b{ font-size:14px; line-height:1.45; font-weight:600; color:#fff; text-align:right; flex:1 1 auto; min-width:0; word-break:break-word; overflow-wrap:anywhere; } @media(max-width:989px){ .r2-feature-grid-3, .r2-feature-grid-2, .r2-spec-grid-2{ grid-template-columns:1fr; } } @media(max-width:749px){ .r2-feature-card, .r2-split, .r2-dark-card{ padding:18px; } .r2-spec-lines div{ display:grid; grid-template-columns:1fr; gap:3px; align-items:start; } .r2-spec-lines span{ font-size:12px; line-height:1.35; white-space:normal; } .r2-spec-lines b{ font-size:14px; line-height:1.4; text-align:left; white-space:normal; word-break:break-word; overflow-wrap:anywhere; } .r2-subtitle{font-size:17px} }
