⚠️ BEYOND D-Clamp Holders Use 0° Negative Relief Inserts (CN / DN / SN INSERT families per ISO 1832)

The D-clamp (Position 1 = "D" letter) catalog of BEYOND external turning holders uses 0° negative relief inserts by default — Position 4 = "N" on the tool holder code (e.g., DCLNR2020K12 = D + C + L + N + R). The N letter designates 0° negative insert geometry, per ISO 1832.

Per ISO 1832, the 2-letter sub-menu family prefix = shape + relief letter. For BEYOND D-Clamp External Holders:

• CN INSERT — CNMG / CNMM / CNGA — 80° rhombic, 0° negative — paired with C-shape D-clamp holders (DCLNR/L, DCBNR/L, DCSNR/L) · 7+4+2+2+2+2 = 19 SKUs
• DN INSERT — DNMG / DNMM / DNGA / DNMX — 55° rhombic, 0° negative — paired with D-shape D-clamp holders (DDJNL, DDQNR) · 3 SKUs
• SN INSERT — SNMG / SNMM / SNGA — 90° square, 0° negative — paired with Square D-clamp holders (DSBNR/L, DSSNR/L, DSKNR, DSDNN) · 16 SKUs

Why this matters: The "D-clamp" mechanism is independent from the insert relief. Always verify Position 4 of the tool holder code matches your insert series (N = negative CNMG/DNMG/SNMG). Pairing a negative-insert holder with positive inserts (DCMT/DCTT etc., 7° relief) causes insert-pocket mismatch and breakage risk.

BEYOND-Original D-Clamp Tool Holders from Hangzhou, China

All 43 D-Clamp BEYOND external tool holders in this catalog are 100% genuine BEYOND — manufactured by BEYOND in Hangzhou, China. Each holder is CNC-machined from premium alloy steel (DIN 1.3343 / AISI M2 equivalent), heat-treated to HRC 60-62, and precision-ground for shank and pocket tolerances within ±0.01mm. Every tool holder follows the BEYOND 9-position code structure: a 5-letter prefix identifying fastening mode (Position 1 = D = dual clamping), insert shape (Position 2), approach angle (Position 3), relief angle (Position 4 = N = 0° negative), and hand direction (Position 5), followed by a 4-digit shank spec identifying shank height, width, total length, and insert IC code.

About BEYOND Double Clamp External Tool Holders

Position 1 = "D" designates the dual-clamp (top + side) fastening method — the most secure locking mechanism for heavy interrupted cuts, which provides redundant clamping force: the top clamp presses the insert down into the seat, while the side clamp prevents rotational shifting under heavy tangential loads.

This catalog contains 43 unique BEYOND dual-clamp tool holder specifications across 16 5-letter codes, 4 ISO 1832 negative-insert families, and 3 insert shapes (C/D/S).

BEYOND 9-Position Tool Holder Code Structure (per official catalog diagram):

Why BEYOND D-Clamp External Holders?

Dual-clamp (D) holders combine top-clamp (pressing insert down into seat) with side-clamp (preventing rotational shifting) — together they provide redundant locking force that survives the highest interrupted-cut loads, forged-skin removal, and high-feed roughing where single-clamp holders would fail.

Compared to BEYOND's screw-clamp (S) and multi-lock (M) systems, D-clamp offers:

• Highest clamping force — dual clamping surface × 2 = redundant security
• Fast insert indexing — clamp releases with single lever (vs. unscrewing for S-clamp)
• Best chip evacuation — side clamp doesn't block chip flow path like top-clamp does
• Compatibility with negative inserts — most D-clamp holders use 0° negative CNMG/DNMG/SNMG inserts, the strongest cutting edge geometry

Trade-offs: D-clamp is heavier (more mass) than screw-clamp, and the clamping mechanism can't accommodate inserts with very thick chip-breaker geometries. Best for: heavy roughing, interrupted cuts, forged-skin removal, scale removal. Not best for: finishing, fine profiling.

Featured BEYOND D-Clamp External Holders

Top 8 5-letter codes by SKU count. Click any code to view the dedicated product page, or scroll down for the complete 43-SKU catalog.

Browse by 5-Letter Code (43 Products in 16 Codes)

Click each code to expand and view individual product URLs grouped by ISO 1832 insert family.

Complete 43-Product Catalog

Every BEYOND Double Clamp External Holder currently in stock — sortable by 5-letter code, insert shape, and ISO 1832 family.

Frequently Asked Questions