What is your minimum order quantity for custom parts?

We support single-piece prototypes and low-volume runs through CNC machining, 3D printing and urethane casting, and scale to mass production through die casting, injection molding and stamping. Share your target quantity and our engineers will recommend the most cost-effective process.

What tolerances can Sunmy Hardware hold?

Standard CNC tolerances are ±0.01 mm, and critical features can be held down to ±0.005 mm. Dimensions are verified with CMM inspection and documented in FAI reports before shipment.

How do you protect my drawings and intellectual property?

We sign a Non-Disclosure Agreement with you by email before collecting any 3D or CAD files. You work directly with the factory, so your data is never handed off to brokers.

Which quality documents are available with shipments?

Material certificates, RoHS compliance documents, First Article Inspection (FAI) reports and CMM dimensional reports can be supplied per project.

Which manufacturing processes are done in-house?

CNC machining and stamping are performed in our own facilities. Casting and surface finishing are completed by audited partners. All final quality control, CMM inspection and FAI are executed in-house by Sunmy engineers before global shipping.

Which CAD file formats do you accept?

We accept STEP, IGES, STL, DWG/DXF and PDF 2D drawings. Physical samples can also be reverse-engineered.

OEM Custom Precision Turned Stainless Steel Dual Thread Hanger Bolt Manufacturer Wholesale Factory Direct Double Threaded Fastener Supplier

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.

Separate Thread 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 & 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 treatments and passivation standards can be specified?

A5: We support plain cleaned, stainless steel passivation, and electropolishing. When specific standards such as ASTM A967/A967M are requested, the treatment and acceptance criteria must be defined and agreed prior to production. Salt spray and corrosion testing parameters are established based on your application demands.

Q6: How is thread quality controlled for both ends of the hanger bolt?

A6: Each threaded section is governed by distinct specifications. Machine threads are verified using thread gauges according to drawing specifications. Wood threads follow custom major/core profile checks. Datum relationships between the dual threads, shank, and flange are verified during intermediate CNC setups.

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OEM Custom Precision Turned Stainless Steel Dual-Thread Hanger Bolt Manufacturer, Factory

Product Description

Product Overview & Application Architecture

Manufacturing Process & Engineering Insights

Technical Specifications & Manufacturing Capabilities

Core Engineering Advantages & Buyer Value Proposition

Technical FAQ for International B2B Buyers