Question 1

When should I use SDS-Max TCT core bits instead of SDS-Plus?

Accepted Answer

SDS-Max TCT core bits live in the heavy wall hole cutting and structural penetration channel above the SDS-Plus volume range. Typical SDS-Max applications: large AC main line penetrations (Ø100–150 mm), commercial plumbing throughway (Ø80–125 mm), industrial conduit and dust extraction ducting (Ø100–150 mm), and any wall hole that requires the higher torque and impact energy of an SDS-Max rotary hammer (Bosch GBH 8-45 / 11-26, DeWalt D25762, Hilti TE 60/70/80, Makita HM/HR41 class).

Question 2

What diameters define the SDS-Max TCT volume range?

Accepted Answer

The SDS-Max TCT MEP volume backbone is Ø65, 80, 100, 125, 150 mm. Below Ø65 mm, SDS-Plus is the right tool — the lighter rig handles smaller diameters more efficiently. Above Ø150 mm, the diamond core bit category (wet coring on a dedicated rig) typically takes over for hard substrate; SDS-Max TCT continues up to Ø200 mm for soft brick and aerated concrete on the heavier hammer rigs.

Question 3

What carbide grade for SDS-Max TCT impact use?

Accepted Answer

YG11C or YG8C — the same cobalt-rich impact-grade carbide families as SDS-Plus, with YG11C preferred for the heavier SDS-Max impact cycle on harder substrates. The SDS-Max rig delivers more impact energy per cycle than SDS-Plus, so the bit needs more cobalt-rich toughness to survive sustained operation without tooth chipping. Documentation per production lot is the standard QC requirement.

Question 4

How does SDS-Max TCT body construction differ from SDS-Plus?

Accepted Answer

Two main differences: (1) wall thickness — SDS-Max bits use heavier tube wall to handle the larger diameter and higher torque load, typically 4–6 mm wall vs 2–3 mm on SDS-Plus; (2) tooth count — SDS-Max bits typically run 6–10 teeth around the circumference depending on diameter, vs 4–6 on SDS-Plus. The body steel grade is usually 42CrMo4 for SDS-Max vs 40Cr for SDS-Plus, reflecting the heavier mechanical load. Heat treatment hardness range stays similar in the 35–45 HRC range on the tube body.

Question 5

Can SDS-Max TCT core bits handle reinforced concrete?

Accepted Answer

Light reinforced concrete with thin rebar — yes, with reduced service life. Heavy structural reinforced concrete with #4 / #5 rebar density — no, diamond core bits are required. TCT teeth chip on rebar contact regardless of carbide grade; the impact mechanism that works in brick and hollow block does not transfer to reinforced concrete cutting. For structural penetration through reinforced concrete, switch to wet diamond core bits on a dedicated coring rig. See our TCT vs diamond core bit comparison for the full decision matrix.

Spec Area	Zhonghuan OEM Standard
Carbide grade	YG11C preferred, YG8C acceptable — cobalt-rich, coarse grain, impact-optimized
Brazing process	Vacuum brazing at 1040 °C, controlled atmosphere, process documentation per lot
Body steel	42CrMo4 heat-treated 35–45 HRC, harder shank end with mill certificate
Shank	SDS-Max per ISO 6296 / DIN 8517 dimensional compliance
Wall thickness	4–6 mm tube wall — heavier than SDS-Plus to handle SDS-Max impact and torque
Tooth count	6 teeth (Ø65–80 mm), 8 teeth (Ø100–125 mm), 10 teeth (Ø150+ mm)
Diameter range	Ø65, 80, 100, 125, 150 mm volume backbone; Ø75, 90, 110, 200 mm available on request
Tube cutting depth	100 mm and 150 mm standard; 200 mm and 300 mm for thick wall and chimney work

Stage	Deliverable
1. Benchmark selection	Buyer specifies brand reference, target substrate, diameter range
2. Spec lock	Engineering spec sheet — carbide grade, brazing, body steel, tooth count, wall thickness
3. Sample drilling test	Witness test in target substrate with hole count and tooth wear measurement
4. Packaging proof	Printed sample of color box, blister, or industrial bulk pack
5. First production lot	Material certificates and process documentation per QC
6. Repeat orders	Same locked spec; per-lot QC documentation continues

SDS-Max TCT Core Bit Manufacturer & OEM Supplier | Zhonghuan

The SDS-Max TCT Heavy MEP Channel

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