Blind Hole Cylinder Sleeves
- Material Range: Carbon, alloy, and stainless steels (AISI 4140, 4340, 316L, 304L, 42CrMo, 34CrNiMo6, S45C).
- Size Capability: Produced strictly per customer drawings; outer diameter ≤ 800 mm, bore depth ≤ 500 mm typical.
- Certificates: ISO 9001, PED, and SGS approved.
- Reports Supplied: Hardness, UT/MT, mechanical, and dimensional reports with each batch.
Technical Specifications
| Parameter | Specification |
| Material | Carbon Steel / Alloy Steel / Stainless Steel / Nickel Alloys |
| Grades | AISI 4340, AISI 4140, 42CrMo, S45C, 100Cr6, 34CrNiMo6, 316L, 304L |
| Standard | DIN / GB / JIS / BA / ANSI |
| Outer Diameter | Up to 800 mm (custom) |
| Bore Depth | 30 – 500 mm (blind hole) |
| Forging Method | Open Die / Free Forging |
| Heat Treatment | Quenched & Tempered / Normalized |
| Surface | Bright Machined / As Forged |
| Tolerance | ±0.02 mm (machined) |
| Inspection | UT / MT / Hardness / Dimension |
| Certification | ISO 9001, PED, SGS |
Customization & OEM Service
- Produce per customer drawings and tolerance requests.
- Choose steel grade, forging standard, and heat-treatment method.
- Define outer diameter, wall thickness, and blind bore depth.
- Specify surface condition (as-forged or machined).
- Provide machining, drilling, and thread finishing.
- Deliver full documentation and material traceability.
- Support sample and mass production orders.
Applications
- Hydraulic and pneumatic cylinder bodies
- Pressure vessel covers and housings
- Bearing bushings and sleeves
- Oil & gas equipment and flanges
- Mining, marine, and construction machinery
Manufacturing Capabilities
Forging Facilities
- 6300T / 3150T / 2000T free hydraulic presses.
- 5T, 3T, 2T, 1T, 750kg, 560kg electro-hydraulic hammers.
Heating Treatment Facilities
- RTX-9 series trolley furnaces in multiple sizes (5.5–8 m chamber length).
- RJ-9-850KW vertical furnace with 15 m depth.
- RTX-12-350KW high-temperature trolley furnace.
Machining Facilities
- CNC machines (max 32-ton load).
- Heavy-duty lathes and vertical mills (up to 70 tons).
- Gantry milling machines, deep-hole boring machines, grinding and turning centers.
Testing & Quality Control
- Spectrum analysis for chemical composition.
- Ultrasonic, non-destructive, and metallographic testing.
- Mechanical property test machines for yield, tensile, hardness.
Production Process
- Raw Material Selection: Use first-grade ingot steel, inspect chemical composition.
- Forging: Heat to precise temperature, perform open die or die forging.
- Heat Treatment: Quenching, tempering, or normalizing to meet mechanical targets.
- Machining: CNC turning, boring, milling, grinding, and drilling to precision ±0.01 mm.
- Inspection: Each shaft tested via 100% ultrasonic, hardness, and tensile checks.
- Packaging & Delivery: Anti-corrosion coating, safe transport packaging, global logistics support.
Additional Value-added Services
- Quench-and-temper heat treating
- Rough and finish turning
- Ultrasonic and mechanical testing
- Dimensional inspection reports
- Customized design and programming support
Quality Assurance
- Each forging carries a test bar for mechanical testing.
- 100% ultrasonic and visual inspection before shipment.
- Hardness, tensile, and metallographic verification.
- Compliance with ASTM, DIN, GB, and EN standards.
Why Choose Boberry
Integrated Production
Complete forging-to-machining production line ensures precision and fast delivery.
Advanced Equipment
Heavy-duty forging presses and CNC systems handle large, complex mechanical component geometries.
Certified Assurance
Certified production with ISO9001, PED, SGS compliance and global OEM support.
Logistics & Delivery
Lead Time: 15–30 days (urgent) / 30–45 days (normal).
Monthly Capacity: 500–1000 tons.
Packing: Wooden crates, steel frames, or per client request.
Shipment: By Sea (recommended, saves cost for forging parts) / By Air (fast but expensive).
Payment Terms: 30% deposit with balance via B/L copy; or 100% L/C at sight.
Delivery Terms: FOB, CIF, CNF.
Monthly Capacity: 500–1000 tons.
Packing: Wooden crates, steel frames, or per client request.
Shipment: By Sea (recommended, saves cost for forging parts) / By Air (fast but expensive).
Payment Terms: 30% deposit with balance via B/L copy; or 100% L/C at sight.
Delivery Terms: FOB, CIF, CNF.