Direct Factory Catalogue
High-Performance Annular Cutters & Industrial Hole Production Bits
Manufactured to rigid DIN 338 and DIN 1897 machining standards, our complete core drilling lineup combines heat-treated high-speed cobalt metallurgy with CNC precision geometry.
SUBORUI 1/4 Inch HSS Fully Ground Titanium Coated Metal Hex Shank Twist Drill Bit
BORUI Manufacturer D338 M35 Hss 5% Cobalt Steel 118 Degree Imperial Bohrer Drill Bit
BORUI 12-80MM Hole Saw Drill Bit Set HSS Hole Cutter for Stainless Steel, Iron, Metal
SUBORUI OEM Factory 3pcs 20mm 25mm 32mm Hex Shank M42 Bi-Metal Hole Saw Cutter Set
SUBORUI DIN338 Fully Ground Titanium 1-20mm Tin Coated HSS M2 6542 Metal Twist Drill Bits
SUBORUI 125mm Fine Abrasive Segmented Cup Diamond Grinding Disc for Granite Marble
SUBORUI Custom Industrial Metric Straight Flute 4-12mm HSS 4241 Unibit Step Drill Bit
Industry White Paper
Engineering Core Drilling Solutions for the Bristol Industrial Ecosystem
From maritime heavy structural retrofits at the Port of Avonmouth to complex aerodynamic tooling in the Filton aerospace corridor, High-Speed Steel (HSS) annular cutters provide clean kerf cuts, low machine vibration, and prolonged tool lifecycles.
Avonmouth & Royal Portbury Docks
Ship maintenance, harbour crane servicing, and marine container refurbishments demand heavy portable magnetic drilling. Our M2 and M35 cobalt annular cutters prevent work hardening in structural S275 and marine-grade S355 structural plates exposed to maritime humidity.
Filton Advanced Manufacturing & Aerospace
Precision jig fabrications, assembly jigs, and ground support equipment (GSE) require tight-tolerance hole making with minimal peripheral burring. Fully ground HSS geometry eliminates secondary deburring on aluminium 7075 and high-tensile steel frame assemblies.
South West Infrastructure & Rail Retrofit
Connecting the Severn Tunnel rail expansion and highway upgrades along the M4/M5 junction requires fast, consistent on-site steel hole cutting. Our 3/4" Weldon and universal quick-change shanks integrate effortlessly with leading portable magnetic drill rigs.
| Steel Grade | Composition (W/Mo/V/Co) | Hardness (HRC) | Thermal Shock Resistance | Best Match Application in Bristol Area |
|---|---|---|---|---|
| HSS M2 (6542) | W6Mo5Cr4V2 | 63 – 65 HRC | Up to 550°C | Structural framing, general warehouse erection, mild structural steel (S275). |
| HSS M35 (Co 5%) | W6Mo5Cr4V2Co5 | 65 – 67 HRC | Up to 620°C | Marine grade steel (S355JR), hard rail joints, stainless plate (304/316L). |
| HSS M42 (Co 8%) | W2Mo9Cr4VCo8 | 67 – 69 HRC | Up to 660°C | Hardened wear plates, offshore brackets, high-tensile alloy assemblies. |
| TCT Tungsten Tip | Fine Carbide Inserts | 89 – 91 HRA | Extreme Heat | High-throughput automatic CNC plate drills & aged iron girders. |
Procurement Insights
Regional Sourcing Trends Across South West England
Understanding shifting procurement dynamics in the UK engineering and construction equipment market.
Tier-1 Vendor Consolidation
Contractors in Bristol, Avonmouth, and Gloucester are streamlining tool replenishment, replacing middle-tier UK brand repackagers by sourcing direct from verified OEM factories with ISO9001 and Intertek audits to capture up to 35% margin relief.
Shift from Twist Drills to Annular Cutters
On-site structural drilling requires reduced power demand and weight. Annular core cutters only remove the perimeter of the hole, requiring 60% less thrust and cut times up to 3x faster than conventional twist drill bits on beams thicker than 15mm.
Consumable Life Cycle Predictability
Fabrication shops rely heavily on tooth geometry consistency. Sub-standard brazing or erratic flute grinding causes premature tooth chipping. Factory-direct fully ground annular cutters ensure identical runout (<0.02mm) across repeat replenishment runs.
Why Choose Jiangsu WRD Tools
19 Years of Cutting Tool Engineering & Export Authority
Founded in March 2007 in Danbei Town, Danyang, Jiangsu WRD Tools operates a 12,000 m² integrated production hub dedicated to high-precision hole drilling technology.
19+
Years Toolmaking Legacy
12,000m²
Modern Production Facility
90M
Annual Bit Capacity
20+
Export Destination Nations
Intertek On-Site Verified Facility
Our raw material incoming lab, computerized heat treatment facilities, runout testing stations, and batch packing setups have been rigorously audited on-site by Intertek Group, guaranteeing genuine metallurgical integrity.
Tier-1 OEM / ODM Brand Vendor
We supply private-label cutting products and sets to leading global brand distributors across Germany, the USA, Switzerland, and the UK, meeting high-standard tensile, torsional, and longevity benchmarks.
Full Process CNC Flute Grinding
Every cutter undergoes automated 5-axis CNC relief, flute, and clearance grinding. We hold exacting diametrical tolerance within +0.02mm, ensuring clean slug ejection and zero chatter in high-feed jobs.
Procurement Guidance
Frequently Asked Questions by Bristol & UK Importers
Key metallurgical, delivery, logistics, and customization details for tool distributor shortlisting.
What shank types do your HSS annular cutters feature to match UK magnetic drill brands? +
Our standard production includes 19.05mm (3/4") Weldon shanks with dual flat clamping, universal shanks (one-touch compatible with Nitto Kohki and Weldon arbors), and Fein Quick-In rapid-clamping shanks. This ensures 100% mechanical compatibility with magnetic drills commonly used in Bristol, such as Rotabroach, Evolution, Magtron, Fein, and Hougen.
When should Bristol workshops choose HSS M2 over M35 5% Cobalt annular cutters? +
HSS M2 (Grade 6542) is cost-effective and reliable for carbon steel, mild structural beam (S275), non-ferrous alloys, and plates under 400 HB hardness. For work along Avonmouth docks or chemical plants handling marine 316 stainless steel, Hardox, or hardened railway track joints, M35 (5% Cobalt) is essential to preserve hardness above 600°C and prevent tooth premature softening.
What is the minimum order quantity (MOQ) and lead time for shipments to South West UK ports? +
For standard annular cutter sizes (12mm to 65mm cutting diameter in 30mm/50mm depth of cut), the MOQ is 10 to 50 pieces per size. Custom laser marked or bespoke packaging kits have an MOQ of 100 sets. Production runs take 20 to 30 days, followed by direct sea freight from Shanghai/Ningbo to Southampton or Bristol Avonmouth Docks (approx. 28–35 days voyage).
Can you support custom laser branding, private labeling, and custom kit cases? +
Yes. We provide complete OEM/ODM services. We laser-etch your company name, tool sizes, and batch numbers directly on the tool shanks. Custom blow-moulded plastic carry cases, heavy-duty aluminium cases, pilot ejector pins, and branded UK retail carton sleeve designs can be manufactured to your brand specifications.
How does your factory ensure concentricity and eliminate slug ejection jamming? +
Slug sticking is primarily caused by improper internal tapered wall relief. Our cutters use a proprietary internal taper clearance geometry ground on automatic multi-axis CNC grinders. Every batch is verified using optical comparators and test-drilled with spring-loaded pilot pins on 25mm structural steel to ensure clean, immediate core slug ejection.
Partner with an Intertek-Verified OEM Annular Cutter Factory
Whether you need standard Weldon shank M2 broach cutters, M35 cobalt hole cutters for stainless structural welding, or customized private-label kits for UK distribution, our engineering team responds with complete drawings and CIF Bristol quotation within 24 hours.