Question 1

What are your packaging conditions?

Accepted Answer

PDC cutters and small accessories are packed in plastic boxes with reinforced export-grade cartons. PDC bits, tricone bits, and other medium-weight drilling tools are secured in cartons with outer wooden cases. Drilling rigs and heavy mechanical equipment use steel frame reinforcement plus wooden case outer packaging — all with moisture-proof lining and foam inserts for impact protection during international transit. If you hold a legally registered patent or trademark, we can package goods in your branded packaging upon receipt of authorization documentation.

Question 2

What are your payment terms?

Accepted Answer

We offer flexible payment structures to accommodate different procurement models: full payment before production, or 50% deposit before production with the remaining balance due before shipment. Before final payment, we provide photos and inspection documentation of completed products and packaging for your review. For repeat customers and established partnerships, customized payment terms can be discussed.

Question 3

What are your delivery terms?

Accepted Answer

We support the full range of Incoterms: EXW (Ex Works), FOB (Free On Board), FCA (Free Carrier), CFR (Cost and Freight), CIF (Cost Insurance and Freight), DAP (Delivered at Place), and DDP (Delivered Duty Paid). For bulk drilling equipment orders, we recommend CIF or DDP terms for streamlined customs clearance. Our logistics team coordinates with major international freight forwarders to optimize container loading and shipping routes for drilling tools and machinery.

Question 4

What is your typical delivery time?

Accepted Answer

Production cycles depend on product type and order volume. Standard catalog PDC bits and tricone bits typically ship within 5-15 working days. Custom-designed bits, large-diameter drilling tools, and drilling rigs may require 15-25 working days depending on engineering review and manufacturing complexity. Repeat orders of standard products can be expedited to 10-15 working days. We provide an estimated production schedule with your quotation.

Question 5

Can you produce based on samples or technical drawings?

Accepted Answer

Yes. We manufacture drilling tools to your provided samples, technical drawings, or CAD specifications. Our engineering team reviews each design against the target formation parameters (hardness, abrasiveness, drilling depth) before production to ensure the tool configuration is viable. For reverse-engineering from physical samples, we perform dimensional analysis, material identification, and cutter profiling before quoting.

Question 6

What is your sample policy?

Accepted Answer

We can provide samples for product evaluation and quality verification. Sample fees and courier charges are covered by the buyer. For standard catalog items, sample preparation typically takes 3-7 working days. Sample fees for standard products are credited toward your first production order. For fully custom designs, sample costs include engineering and tooling setup.

Question 7

Do you test all goods before delivery?

Accepted Answer

Yes, 100% testing before shipment. Our quality control process covers three stages: incoming raw material inspection (alloy composition verification, tungsten carbide grade confirmation), in-process inspection at each manufacturing stage (brazing temperature monitoring, cutter alignment measurement, dimensional tolerance checking), and final outgoing inspection before packaging (visual examination, gauge diameter verification, thread compatibility testing). PDC bits undergo diamond layer hardness verification (HRA 78-90 / HV 7500-10000+) and bond integrity testing between the diamond table and carbide substrate. Each shipment includes documented inspection records.

Question 8

How to establish long-term business relationships with SUNGOOD TECH?

Accepted Answer

We build lasting partnerships through three commitments: (1) consistent product quality with competitive factory-direct pricing — our customers benefit from manufacturing cost advantages without compromising on material or process standards; (2) technical partnership — our engineering team provides drilling parameter recommendations and tool selection guidance as a value-added service, not just as a supplier; (3) transparent communication — from quotation to delivery, we treat every customer as a long-term partner, regardless of order size or country of origin. We have supplied drilling contractors in over 30 countries across the Middle East, Africa, Southeast Asia, and South America.

Question 9

What is the typical service life of a PDC drill bit?

Accepted Answer

The service life depends on formation hardness, drilling parameters, and bit design. In soft to medium formations (Mohs 2-5), a well-manufactured PDC bit typically drills 200-800 meters before requiring replacement. In medium-hard to hard formations (Mohs 5-8), the range decreases to 100-400 meters. Proper weight on bit (WOB) and rotational speed (RPM) optimization can extend service life by 20-35%. Regular post-run inspection helps identify abnormal wear patterns early, reducing premature failure and total drilling cost.

Question 10

How do I choose between a 4-blade and 6-blade PDC drill bit?

Accepted Answer

4-blade PDC bits are engineered for soft to medium-hard formations (Mohs 2-5), delivering faster penetration rates with lower torque requirements. They perform well in water well drilling and shallow oil and gas applications. 6-blade PDC bits are built for medium-hard to hard formations (Mohs 5-8), offering greater durability and borehole stability at the cost of slightly slower ROP. The higher blade count distributes cutting forces across more contact points, reducing individual cutter loading and extending bit life in abrasive conditions. Match blade count to your target formation hardness for optimal balance between penetration speed and bit longevity.

Question 11

What is the difference between steel body and matrix body PDC bits?

Accepted Answer

Steel body bits are machined from high-strength alloy steel, offering lower manufacturing cost, easier repairability, and good performance in large-diameter applications (12-1/4 inch and above). They can be rebuilt multiple times, reducing total cost of ownership for repeat-use scenarios. Matrix body bits are formed by sintering tungsten carbide powder in a mold, providing superior erosion resistance in abrasive formations. The matrix material maintains its profile longer in directional drilling applications where borehole wall contact is continuous. Matrix body bits generally last longer in hard-rock and geothermal drilling scenarios, while steel body bits remain cost-competitive for water well and shallow oil and gas operations.

Question 12

What types of PDC cutters does SUNGOOD TECH supply?

Accepted Answer

We supply three main PDC cutter profiles optimized for different formation types. Flat-top cutters: designed for soft formations (Mohs 2-5), providing maximum cutting aggression and fastest ROP. Arc-shaped (convex) cutters: engineered for medium to hard formations (Mohs 5-8), offering 20-35% longer service life through improved impact resistance while maintaining cutting efficiency. Concave cutters: specialized for hard formations (Mohs 6+) and directional drilling, where the concave face promotes chip evacuation and reduces balling in sticky formations. The industry-standard 1308 size (13 mm diameter, 8 mm total thickness) is our most commonly stocked PDC cutter specification. Diamond coating technology is available for enhanced wear resistance in highly abrasive formations.

Question 13

How do I read a tricone bit IADC code?

Accepted Answer

The IADC classification code for tricone bits uses 3 digits plus an optional 4th letter. The first digit indicates formation hardness and tooth type: 1-3 for steel tooth bits (1 for softest formations, 3 for hardest), and 4-8 for tungsten carbide insert (TCI) bits (4 for softest, 8 for hardest). The second digit (range 1-4) provides hardness subdivision within that category. The third digit describes bearing configuration: 1-3 for open bearing designs, 4-7 for sealed bearing systems. The optional 4th letter indicates special features — A for air drilling, B for special seal, C for center jet, D for deviation control, G for extra gauge protection, H for horizontal drilling, M for downhole motor application. Example: IADC 637 identifies a TCI bit for hard formations with sealed journal bearings and gauge protection, commonly specified for copper porphyry mining and hard-rock exploration drilling.

Question 14

What is the difference between steel tooth and TCI tricone bits?

Accepted Answer

Steel tooth (milled tooth) bits have cutting teeth machined directly from the cone forging material. They are cost-effective for softer formations where impact toughness matters more than abrasion resistance, and are commonly used in water well drilling, shallow oil and gas wells, and soft-formation mining. TCI (tungsten carbide insert) bits use individually pressed and sintered carbide inserts as cutting elements. The inserts far outlast milled teeth in medium to hard abrasive formations, making TCI bits the standard choice for deep oil and gas wells, hard-rock mining exploration, and geothermal drilling. TCI bits also maintain gauge diameter better over the run, which is critical in directional and horizontal drilling applications.

Question 15

What applications are DTH hammers best suited for?

Accepted Answer

DTH (Down-the-Hole) hammers deliver pneumatic percussion energy directly to the bit at the bottom of the hole, minimizing energy loss compared to top-hammer systems. This makes them ideal for hard-rock drilling applications including mining blast holes, water well drilling through granite and basalt formations, geothermal boreholes, and construction foundation drilling. DTH systems maintain consistent penetration rates even at depths exceeding 200 meters, where top-hammer drilling efficiency drops significantly. SUNGOOD TECH supplies DTH hammers in standard shank configurations with matching bits from 3 to 12 inches in diameter. Common shank types include DHD, COP, and SD series, compatible with major global hammer brands.

Question 16

Does SUNGOOD TECH provide full OEM and ODM customization?

Accepted Answer

Yes. We offer complete OEM and ODM services across our entire drilling tool product line. Customization options include: PDC cutter arrangement and blade count configuration, body material selection (alloy steel or matrix), gauge protection design (natural diamond, TSP, or tungsten carbide inserts), nozzle configuration for hydraulic optimization, private labeling with custom-branded packaging, and thread connection adaptation to regional standards (API Reg, API IF, BECO, and others). Our engineering team reviews each custom specification against the target formation parameters before production to verify design viability and recommend optimizations based on field experience.

Question 17

What are your minimum order quantities and lead times for custom products?

Accepted Answer

MOQ varies by product category and customization complexity. Standard catalog PDC bits and tricone bits typically have flexible minimums suitable for trial orders and small drilling contractors. Fully custom designs with new mold or engineering development require larger minimum production batches. Typical production lead time is 15-25 working days after order confirmation and technical drawing approval. For repeat orders of standard products, lead time can be shortened to 10-15 working days. We recommend contacting our sales team with your target specifications for a detailed quotation including MOQ and delivery schedule.

Question 18

What quality control system does SUNGOOD TECH maintain?

Accepted Answer

Our multi-stage quality system covers the full manufacturing chain. Stage 1 — incoming material inspection: alloy composition verification via spectrometry, carbide grade and grain size confirmation, diamond table thickness measurement. Stage 2 — in-process monitoring: brazing temperature control and joint integrity testing, cutter alignment and exposure height measurement, dimensional tolerance verification at each machining step. Stage 3 — final outgoing inspection: 100% visual inspection under magnification, gauge diameter and thread gauge verification, hardness testing (PDC diamond layer HRA 78-90 / HV 7500-10000+), and bond integrity verification. Each production batch is accompanied by documented quality records traceable to raw material heat numbers and operator identification.

Question 19

What shipping and logistics support do you provide for international orders?

Accepted Answer

For international drilling equipment orders, we coordinate with major freight forwarders serving the Middle East, Africa, Southeast Asia, and South America. Standard ocean freight uses 20-foot or 40-foot containers with optimized palletizing for drilling tools. Packaging uses export-grade wooden cases with moisture-proof barrier lining and custom foam inserts shaped to each tool profile. For urgent requirements, air freight and express courier options are available. We provide container loading plans, packing lists with HS codes, and shipping documentation support. For large-scale projects, we can arrange partial shipments to align with your project drilling schedule.

Question 20

How can I request a quotation or technical consultation?

Accepted Answer

Contact our engineering and sales team at yanceychang@zzsungood.com. For an accurate quotation, please include: target formation type and hardness range, planned hole diameter and depth, drilling method (rotary, DTH, directional), rig specifications if available, estimated order quantity, and delivery destination. For technical consultation, our engineers will recommend the optimal tool configuration based on your drilling parameters at no cost. Typical response time is within 1 business day for technical inquiries and 1-2 business days for formal quotations with detailed specifications.

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