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OEM Custom Precision Turned Stainless Steel Dual-Thread Hanger Bolt Manufacturer, Factory
Product Description
Product Overview & Application Architecture
Shenzhen Sunmy Hardware Co., Ltd. supplies custom stainless steel dual-thread hanger bolts for timber-to-metal connections, mounting brackets and project-specific fastening assemblies. One end has a machine thread for a mating nut or tapped component; the other has a pointed coarse wood thread for engagement in a suitable timber substrate. CNC turning and secondary operations support non-standard lengths, flange dimensions and drive features. Solar mounting applications can be evaluated against the customer's assembly design, installation conditions and validation requirements.
The illustrated configuration combines a machine-thread end, an internal six-lobe drive recess, external hexagonal wrench flats, an integral seating flange and a coarse pointed thread. Thread lengths, flange position, wrench access and drive geometry can be adjusted to match your mating components. This is a made-to-order component, not a fixed catalogue size. Final material, finish, thread engagement and acceptance criteria are confirmed on the approved production drawing.
OEM/ODM CUSTOM MANUFACTURING: Geometry, thread combinations, drive type, material, finish and quantity can be tailored to your drawings or samples. Standard sizes below are reference options, not a fixed catalogue range. Final specifications and acceptance criteria are agreed before production.
Manufacturing Process & Engineering Insights
CNC Turning & Datum Control
For machined configurations, bar stock is turned to the required shank, flange and transition diameters. Workholding and tool access are reviewed to control the relationships between both thread sections. Swiss-type or conventional CNC turning is selected for the actual geometry and order volume, with secondary setups planned around the critical datums.
Hexalobular Drive Recess Machining
The internal six-lobe recess is produced using a suitable broaching or machining method. Recess profile, depth, tool engagement and remaining wall section are reviewed together. The required drive designation, matching bit and inspection method are agreed before manufacture.
Hexagonal Wrench Flats & Seating Flange
Wrench flats and the flange are manufactured to the specified across-flats size, thickness and axial position. Their relationship to the threads is checked so the installer can access the drive and counter-hold the fastener. The flange provides a seating feature; any sealing function depends on the specified assembly.
Thread Specifications & Quality Control
Each end has its own thread specification. Diameter, pitch, engagement length, runout and root transitions are reviewed before choosing the thread-making process. Mating threads are checked with suitable gauges; the wood-thread profile and point follow the approved drawing. Pilot-hole and embedment requirements belong in the installation specification.
Deburring, Cleaning & Surface Treatment
Thread starts, flange edges and the drive opening are deburred without changing functional geometry. Cleaning, stainless steel passivation or another compatible finish is specified for the selected material. When ASTM A967/A967M is requested, agree the treatment and acceptance method. Required corrosion testing is defined by its method, duration and acceptance criteria.
Technical Specifications & Manufacturing Capabilities
| Parameter | Technical Specification / Reference Options | Customization Capability |
|---|---|---|
| Product Name | Custom Stainless Steel Dual-Thread Hanger Bolt | Made to customer drawings or samples |
| Manufacturing Process | CNC turning with thread, drive and hex-feature machining as required | Process and tooling selected after drawing and volume review |
| Material Options | Stainless steel 304, 316, 316L, 303 or 410; carbon steel or brass by request | Grade, condition and required property class specified separately |
| Machine-Thread End | Metric examples: M6, M8, M10, M12. UNC examples: 1/4"-20, 5/16"-18, 3/8"-16 | Metric coarse/fine, UNC/UNF or custom profile; pitch, length and class per drawing |
| Wood-Thread End | Pointed coarse wood/lag thread; pitch and point geometry per approved design | Custom major/core diameters, thread length, transition and engagement requirements |
| Drive System | Internal hexalobular six-lobe recess with external hexagonal wrench flats | Recess size/depth, across-flats width and alternative drive forms per drawing |
| Shoulder / Flange | Integral seating flange with adjacent wrench section | Custom flange diameter, thickness and position; washer or seal interface by design |
| Dimensional Requirements | Critical dimensions, datum relationships and general tolerances per approved drawing | Identify thread alignment, seating, edge and drive requirements before quotation |
| Surface Finish | Plain cleaned, stainless passivation or electropolishing; other finishes by material | Specify appearance, finish thickness where applicable and corrosion-test criteria |
| Inspection Plan | Dimensional, thread and visual checks with suitable gauges or measurement methods | Sampling, first-article checks, test scope and reporting agreed with the order |
| Documentation & Compliance | Material, inspection and treatment records to agreed scope | Certification, regulatory declarations and PPAP requests reviewed before acceptance |
| Production Volume & Lead Time | Prototype, pilot and repeat-order quantities; project-specific MOQ | Sample, tooling, finishing and batch delivery schedules confirmed in the quotation |
Core Engineering Advantages & Buyer Value Proposition
Integrated Geometry for Custom Assemblies
The flange, wrench flats and two threaded ends can be incorporated into one machined component. This allows their dimensions to be coordinated on a single drawing. Required tensile, shear and installation performance are specified separately and verified to the agreed plan.
Two Accessible Drive Interfaces
A six-lobe socket and external wrench flats provide alternative tool access and a counter-holding position. Drive engagement, installation torque and tool clearance are matched to the selected bit, wrench and mating hardware during assembly review.
Project-Specific Seating & Seal Interfaces
Flange diameter, thickness and seating position can be matched to a bracket, washer or specified elastomeric seal. The flange alone does not make a roof penetration watertight. Seal material, compression and installation details must be approved as part of the mounting system.
Material & Finish Matched to Service Conditions
Customers can specify the stainless steel grade, material condition and finish for the intended environment. Mechanical-property and corrosion requirements are agreed separately. Requested corrosion testing is defined by its method, duration and acceptance criteria for the supplied configuration.
Coordinated Multi-Process Supply
Sunmy can coordinate turned fasteners with CNC-machined brackets, stamped baseplates, cast components and molded parts for the same project. Supply scope, interface dimensions, inspection responsibilities and delivery requirements are agreed together, giving buyers one point of contact for the specified mechanical components.
Technical FAQ for International B2B Buyers
Q1: Can Sunmy customize both threads, drive details and overall geometry?
A1: Yes. We manufacture to customer drawings or develop an agreed drawing from a physical sample. Overall length, machine-thread diameter and pitch, wood-thread profile, thread lengths, flange dimensions, hex width and drive recess can all be customized. Send STEP or IGES files with a dimensioned PDF or DXF drawing, material requirements, mating-part details and quantities. The listed options are examples, not limits on your design.
Q2: What material and inspection documents can be included with an order?
A2: Agree the documentation package when requesting the quotation. It can include available material certificates, dimensional and thread inspection records, and finishing records. EN 10204 3.1 documents, mechanical-property tests, corrosion tests or customer approval submissions require scope and availability confirmation. A material grade such as 304 or 316 does not by itself establish a finished-fastener property class such as A2-70 or A4-80.
Q3: How are sample and production lead times confirmed?
A3: Lead time is confirmed after reviewing the drawing, material availability, thread tooling, finishing and inspection requirements. The quotation separates sample preparation, any dedicated tooling and repeat production. Samples are checked against agreed acceptance criteria before the approved drawing and process are released for the next production stage.
Q4: Do you support prototypes, pilot quantities and repeat orders?
A4: Yes. Prototype, pilot and repeat-production quantities can be reviewed as separate stages. MOQ and tiered pricing depend on material sourcing, tooling, setup and finishing rather than one fixed quantity for every custom fastener. Send your drawing or sample details with the first-order quantity and expected repeat demand for a project-specific manufacturing proposal.
Q5: What surface finishing and corrosion passivation standards can be specified?
A5: We provide plain cleaned, stainless passivation (such as ASTM A967/A967M standards) or electropolishing. Specific corrosion testing, method parameters, exposure duration and acceptance criteria can be defined and verified prior to production according to your project's environmental conditions.
Q6: Does the integral flange provide a watertight roof seal on its own?
A6: No, the flange provides a structural seating feature; it alone does not make a roof penetration watertight. Seal material, compression and installation gaskets must be approved and integrated as part of the overall mounting assembly design to guarantee leak-free performance.
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