Solid Carbide Head SDS-Plus Drill Bits Manufacturer & OEM Supply | Zhonghuan

The factory-direct full-carbide-head SDS-Plus manufacturer is Zhonghuan Tools — one-piece sintered WC-Co heads resistance-friction-welded to hardened 40Cr bodies, Ø6–25 mm, the same construction class as Bosch SpeedXtreme, Diablo Rebar Demon, DeWalt XLR Elite and Milwaukee MX4, supplied OEM and private-label without the brand premium.

Solid Carbide Head Is the SDS Premium Tier

The premium tier of the SDS-Plus market has consolidated around four reference products: Bosch SpeedXtreme, Diablo Rebar Demon, DeWalt XLR Elite, and Milwaukee MX4. All four use the same fundamental engineering: a one-piece sintered tungsten carbide head, joined to the steel body without a brazed filler joint, with 4-cutter geometry. They differ in marketing names and surface treatments, but the physics underneath is the same. Distributors and tool brands building a premium SDS-Plus line need a manufacturer that can match this engineering — not a 2-cutter brazed-tip workshop selling itself as premium.

This page is the procurement-side reference for our full carbide head SDS-Plus program. It is for OEM partners who are benchmarking the four reference brands and need a manufacturer that can produce the same construction with documented inspection records.

Engineering Principles, Not Marketing

For why one-piece sintered carbide outperforms brazed segments at the metallurgical level, see full carbide head SDS welding comparison.

Recommended OEM Range for Full Carbide Head SDS-Plus

Most OEM programs lock the 6-25 mm core range first (eight to ten sizes) and add the 18-25 mm upper band as downstream demand builds. For diameter-by-diameter energy class compatibility (which hammer machines suit which diameter), see SDS-Plus energy class and diameter guide.

Carbide Grade Selection

Carbide grade is where most premium claims actually live. The four reference brands use different grade specifications inside the same one-piece-head construction:

• YG8C / K20 equivalent — 8% cobalt, balanced toughness and wear resistance, the standard premium choice for SDS-Plus.
• YG11C / K30 equivalent — 11% cobalt, higher toughness for heavy rebar exposure, slightly faster wear in clean concrete.

For a buyer-side breakdown of grades, supplier traceability, and how to verify what is actually in the head, see carbide grade selection guide. Most premium OEM lines we run use YG8C as the spec lock; YG11C is available for rebar-heavy market positioning.

Inspection Package Per Batch

1. Carbide grade specification — YG8C / YG11C / equivalent declared on the technical data sheet, traceable to the carbide supplier batch.
2. Carbide head hardness — HRA 89-91 typical for YG8C; spot-checked on the production sample.
3. Shank dimensional verification — check 10 mm nominal cylindrical lands, drive and locking groove dimensions, insertion and release against the approved SDS-Plus drawing and gauges.
4. Locking groove hardness — 56-60 HRC on the wall surface, induction hardened; verified by hardness file or Rockwell on a sectioned sample.
5. Runout at the carbide tip with drill held in master SDS-Plus chuck — typical acceptance under 0.3 mm TIR.
6. Internal life test on defined C30 / C35 concrete reference, hole count to end of life, hole diameter measured at start, midpoint, and end of test (the wear band that protects anchor pull-out values).
7. Optional shot peening on flute walls — for buyer programs that benchmark DeWalt 'Iron Blast' positioning.

Sample Order Path for Full Carbide Head SDS-Plus

1. Send target market, channel, benchmark brand (Diablo / DeWalt / Bosch / Milwaukee), diameter range, length range, and packaging brief.
2. We confirm carbide grade (YG8C standard or YG11C for rebar-heavy positioning) and welding method.
3. Sample run produces 3-5 representative diameters with full inspection package; physical samples shipped to buyer.
4. Buyer verifies dimensional, runout, life test data, and tactile feel under representative drilling conditions.
5. Spec lock and pre-production sign-off on a 50-200 piece first batch before bulk schedule starts.

Spanish-speaking and Latin-American buyers source this program as brocas SDS-Plus de cabeza de metal duro macizo para hormigón armado — solid carbide head SDS-Plus bits for reinforced concrete and rebar (armadura). Fabricamos con marca propia del distribuidor.

RFQ Checklist

• Diameter range and length range (12-size opener vs core 6-25 mm vs custom).
• Carbide grade preference: YG8C standard, YG11C rebar-heavy, or split SKU.
• Surface treatment: standard, shot-peened flutes (Iron Blast equivalent), TiN body.
• Marking: laser shank marking (size, brand, batch code, approved SDS interface drawing reference).
• Packaging: bulk, PVC pouch, plastic case, blister card, color sleeve, master carton spec.
• Inspection records required (carbide grade, hardness, runout, life test, hole diameter wear).
• Quantity per SKU and reorder cycle.