Products Description

Connecting shank type fine boring tools adopt high-precision split modular connection structure, matched with sensitive and stable micron fine adjustment boring head. The boring head and connecting shank are used in split combination, with tight and firm rigid connection, ultra-high overall concentricity, and no dimensional deviation after long-time cutting. Users can freely select long and short connecting shanks according to processing depth, flexibly extend processing stroke, easily adapt to diverse complex inner hole conditions including shallow holes, ordinary holes and long-overhang deep cavities, and effectively expand the application range of single tool set.
The tool body is integrally quenched and precisely ground from alloy steel, with excellent bending and compression resistance as well as outstanding anti-vibration performance. Stable smooth long-distance deep hole cutting effectively eliminates chatter marks and surface defects, greatly improving inner wall finish quality. The fine adjustment scale is clear and precise, without backlash or rebound, realizing strict accurate size control and stable consistent mass production. Standard universal connecting interface fits mainstream CNC equipment, easy assembly and strong interchangeability simplify debugging procedures. Widely used in high-precision inner hole boring of CNC machining centers for mold industry, auto parts, hydraulic valves, construction machinery housings and other fields.


CNC flexible boring tool	Connecting Fine Boring Tool Series

Technical Features

Product Core Advantages & Cost-Saving Practical Highlights

Flexible Combined Connecting Shank

Freely matched with long and short connecting rods, extending processing depth as required. No need to replace the whole tool set, greatly reducing tool procurement costs and adapting to complex working conditions.

High-Precision Concentric Connection Structure

Closely positioned connection part with minimal concentricity error. No eccentricity or vibration in long-overhang cutting, effectively improving hole accuracy and surface finish.

High Rigidity & Stable Anti-Vibration Cutting

Integral quenched alloy steel body with strong connection rigidity. Effectively suppresses cutting resonance, stable long-distance deep hole processing and reduces scrap loss.

Universal Interchangeable Standard Interface

Standardized connecting interface, strong interchangeability between boring head and shank. Quick tool setting saves debugging time and greatly improves machining efficiency.

Application Fields

Widely Adaptable Industries & Various Processing Working Conditions

Micro Precision Component Machining

High-precision boring for slender inner holes of micro shafts, pins and small hardware parts, strictly controlling fitting tolerance of micro holes.

Electronic & Communication Parts Processing

Precision finishing of small deep holes in sensor cavities, precision valve sleeves and electronic structural parts, meeting miniaturized high-precision processing requirements of electronic products.

Small Precision Mold Cavity Machining

Deep hole boring for micro mold inserts and small mold cavities. Compact shank structure goes deep into micro cavities, ensuring stable mass production accuracy of small mold holes.

Thin-Wall Slender Pipe Machining

Small-diameter processing for thin-wall sleeves and slender pipes. Tungsten steel anti-vibration body avoids thin-wall deformation, stably guaranteeing geometric tolerance integrity of small holes.

Main Technical Parameters

Type	Boring Range φ(Dmm)	Adapter Size	Shank Diameter D	Tool Diameter d	Total Length L	Effective Length L2	Compatible Insert
SDJ20	20-28	LBK1	φ11	φ19	51	38	Universal TPGH09
SDJ25	25-47	LBK2	φ14	φ24	58	42	Universal TPGH09
SDJ32	32-66	LBK3	φ18	φ31	68	48	Universal TPGH09
SDJ40	40-78	LBK4	φ22	φ39	81	57	Universal TPGH09
SDJ52	52-108	LBK5	φ28	φ50	99	69	Universal TPGH09
SDJ68	68-114	LBK6	φ36	φ63	123	83	Universal TPGH09
SDJ114	114-200	LBK6	φ36	φ63	123	83	Universal TPGH09

Note

The above models and lengths support customized effective length configurations: 4x, 5x for integrated high-speed steel tools; 6x, 8x, 10x for tungsten steel tools. Please consult local distributors for detailed parameters.
Example: SDJ0809-GT-120L, Total length 120mm - Shank clamping length 40mm = Effective machining depth 80mm.Effective length 80mm + Shank clamping length 40mm = Total length 120mm.

FAQ

Common Existing Problems & Processing Troubles In Boring Industry

Q: Q1: Non-standard messy shank interfaces cannot match extension bars, severely limiting small-diameter deep hole processing conditions?

A: A1: Traditional small-diameter boring tools have irregular shank specifications, incompatible with universal LBK interfaces and unable to extend processing depth freely. SDJ-LBK adopts standard LBK shanks, flexibly matching extended anti-vibration bars and fully covering all slender small-hole working conditions.

Q: Q2: Low rigidity of ordinary steel shanks causes vibration and chatter marks, frequent out-of-tolerance small-hole accuracy and finish quality?

A: A2: Ordinary carbon steel shanks have poor anti-vibration performance, strong resonance in long-distance slender hole cutting leads to massive defective products. Our tungsten steel tool head + high-rigidity precision shank effectively suppresses vibration and reduces scrap loss greatly.

Q: Q3: Fixed integrated shanks have single length, unable to adapt shallow and deep small holes, resulting in huge tool inventory and high costs?

A: A3: Traditional integrated boring tools have fixed length, requiring separate tool stock for different holes with high capital occupation. Split SDJ-LBK structure supports free length combination, one tool set adapts all conditions and greatly cuts inventory costs.

Q: Q4: Poor concentricity between tool head and shank causes clamping eccentricity, poor batch hole consistency and high rework rate?

A: A4: Old non-standard shanks have rough positioning and large connection clearance, leading to continuous dimensional drift in long processing. Precision fitting LBK shank structure ensures ultra-high clamping concentricity and stable consistent batch dimensional accuracy.

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