Custom Black Long Hex Socket Screws Manufacturer
Shi Shi Tong manufactures long hex socket screws to customer specifications. Custom head dimensions, shank geometry and thread lengths help the screw fit the joint; the black finish is selected for the material and operating conditions. Our support covers drawing review, tooling and sample planning, batch manufacturing and inspection.
- Socket cap, button and countersunk head configurations
- Full thread, partial thread and custom plain shanks
- Metric and inch thread projects assessed from the drawing
- Black finish options matched to the material and operating conditions
Black Long Socket Screws for Custom Assemblies
These screws combine an internal hex drive with a machine thread and an extended shank.
The head, plain-shank section and threaded section are configured around the seating surface, clamping distance and mating thread.
“Socket” here means the hexagonal recess used by an Allen key. The product is intended for mechanical assemblies rather than wall-socket or switch-faceplate installation.
Selection Considerations
- Head envelope and tool access
- Clamping distance and thread fit
- Material and strength requirements
- Black finish and test criteria
Choose the Head That Fits the Assembly
Start with the seating surface and the space available for the head and installation tool. The same nominal thread can require different head dimensions, recess depths and length references.
Long Socket Head Cap Screws
A cylindrical head with an internal hex recess suits joints where the head can remain above the seating surface. Head diameter, head height and usable socket depth determine how the screw fits the surrounding components and tool.
Long Button Head Socket Screws
A rounded, lower-profile head is a useful starting point when a conventional cap head projects too far above the assembly. The broader head outline and available socket engagement should be considered together with the required tightening torque.
Head geometry reference; finish is specified separately.
Long Countersunk Socket Screws
A countersunk head is a drawing-based option for a prepared seating surface that needs a flush screw head. The head angle, seating depth and recess geometry must match the component; the drawing also establishes whether length includes the head.
Need a Different Head or Shank?
Low-profile heads, modified bearing surfaces, specified plain-shank diameters and special end features can be assessed against your drawing. These are custom design options rather than a fixed stock range.
Custom Dimensions, Threads and Shank Details
Length alone does not define a long socket screw. Thread engagement, the clamped stack and the unthreaded portion all contribute to the specification. Shi Shi Tong reviews these features together so that the manufacturing and inspection requirements follow the intended joint.
| Configuration | Selection Basis |
|---|---|
| Overall long-screw assessment scope: M1.4–M12; lengths 2–2000 mm | This is a company-wide long-screw range. The feasible hex socket configuration depends on head geometry, material, length-to-diameter ratio, tolerances and process. |
| Metric and inch threads | The drawing identifies pitch or TPI, tolerance class and mating thread. |
| Full thread, partial thread or specified effective thread length | Match the thread to the engagement zone and the plain shank to its assembly function. |
| Cap, button, countersunk or drawing-defined low-profile heads | Define the seating surface and head envelope. |
| Internal hex drive | Define the hex size and usable recess depth. |
| Specified shank diameters and drawing-defined secondary features | Review locating, clearance, transition and end geometry separately from the nominal thread size. |
| Material grade and condition | The material must suit the selected geometry and finish. |
| Mechanical requirements reviewed by project | The forming route and heat treatment must support the strength class. |
| Material-compatible surface treatment with an agreed appearance | Coating allowance and finished thread fit are part of the specification. |
| Drawing dimensions, thread gauges, socket dimensions and project tests | Agree the critical features, measurement methods and acceptance criteria. |
| Quantity, schedule and packing | Identify repeat-order controls and delivery requirements. |
Full Thread or Partial Thread?
Full Thread
Choose a fully threaded layout when the joint needs threads along most of the usable length. Check the engagement zone and any contact with clearance holes or supporting components before fixing the thread coverage.
Partial Thread
A partially threaded layout provides a defined plain-shank section before the engagement zone. Specify the shank diameter, thread start and effective thread length so that the screw matches the clamped stack.
Match the Black Finish to the Material
The desired black appearance can be achieved through different treatment routes. Material, strength, coating thickness and exposure conditions determine which route belongs in the specification. A photo can show the appearance, but it cannot identify the treatment or establish corrosion performance.
Carbon and alloy steel
Black zinc; suitable black zinc-nickel or electrophoretic systems. Strength requirement, pretreatment, coating allowance, friction and the required corrosion test.
Austenitic stainless steel
Suitable QPQ, high-temperature blackening or electrophoretic routes; black plated systems require additional review. Exact grade, process compatibility, appearance, functional surfaces and finished dimensions.
Hardenable stainless steel
Suitable high-temperature blackening or electrophoretic routes. Material grade, heat-treatment sequence, mechanical requirements and surface condition.
Aluminum
Black anodizing on an appropriate alloy and condition. Alloy, temper, film thickness, color sample and dimensional allowance. Aluminum screw projects are currently assessed as machined parts; black anodizing is selected for the confirmed alloy and condition.
Copper and copper alloys
Suitable black nickel or black zinc systems. Pretreatment, adhesion, coating thickness and any conductivity or appearance requirement.
Finished Dimensions and Appearance
Coating allowance affects thread fit, shank clearance and the usable socket opening. The inspection plan identifies which features are checked after treatment. An approved appearance sample can also establish the required color and gloss.
Define Performance Separately from Color
Outdoor or corrosive service requires a defined substrate, treatment system and test specification. For high-strength steel, zinc-based plating routes also require assessment of hydrogen-embrittlement controls and any applicable baking requirements.
Engineering Support for the Complete Screw
Custom length, a shallow head, a special thread position and a black finish can interact in the same part. Shi Shi Tong assesses the complete design instead of treating each request as an isolated option.
Fit the Tool and the Seating Surface
Limited headroom can prevent a screw head from seating or an Allen key from engaging fully. Head diameter, head height, bearing surface and socket depth need to work together within the available space.
Put the Thread Where the Joint Needs It
Overall length alone does not define the joint. The thread must engage the mating part while the plain shank clears or locates the components in the assembly.
Keep the Finish in the Dimensional Plan
A black finish is part of the screw specification. The material, coating thickness and treatment route need to be considered alongside thread fit, socket engagement and appearance.
From Drawing to Repeat Orders
1. Drawing and Assembly Review: Define the head, drive, shank, thread and installation requirements from the drawing and mating parts.
2. Process Planning: Select the forming route, thread-making sequence, secondary operations and inspection points for the specified design and material.
3. Sample Validation: Check the agreed dimensions and assembly features, then submit samples for approval.
4. Repeat-Order Control: Keep the approved drawing revision, material and finish requirements, inspection records and batch identification connected to the order.
Manufacturing and Inspection for Long Hex Socket Screws
Shi Shi Tong has manufactured screws since 1998. Our Shenzhen operation brings together drawing review, process development, sample validation and project-specific inspection under ISO 9001 quality management. For long hex socket screws, the production plan connects the head and recess geometry, shank, thread and surface-treatment requirements.
The forming or machining route is material-specific. Aluminum screw projects are assessed through machining rather than cold heading.
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Multi-station forming Supports designs that need a progressive forming sequence for the head or shank.
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Open-die forming A length-specific option for suitable extra-long screw designs.
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Thread rolling Produces the specified external thread, effective thread length and fit.
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CNC secondary machining Completes agreed local features and dimensions where the selected route requires machining.
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Surface-treatment coordination Connects the material, appearance and functional requirements to the selected treatment and finished-part checks.
The selected operations and their sequence depend on the design; a custom screw does not automatically require every process listed.
Inspection Focused on the Functional Features
Measurement methods, sampling requirements and acceptance criteria are agreed for the order.
Head and internal hex
Head diameter and height, hex across-flats size, recess depth and visual condition.
Length and shank
Agreed length reference, plain-shank diameter, thread length and other critical drawing dimensions.
Thread & Material
Pitch, tolerance requirements and GO/NO-GO gauging. Material verification, hardness or torque testing as required.
Finished surface
Appearance, dimensional allowance and any agreed treatment or corrosion-test requirements.
Browse Questions
- How is the length of a long hex socket screw specified?
- Can you assess an M6 × 80 mm black socket screw?
- What should I consider for outdoor use?
- Does a black finish identify the coating or corrosion resistance?
- Can a long socket screw be made to a high-strength requirement?
- What affects the quotation, sample plan and production schedule?
Ordering and Selection Questions
How is the length of a long hex socket screw specified?
Use the length reference shown on the drawing. Socket cap and button head screws are normally dimensioned from beneath the head to the end. A countersunk configuration normally includes the head in the length reference, but the applicable drawing or standard takes priority.
Also distinguish total screw length, usable thread length and the plain-shank section. These dimensions answer different assembly questions. The overall company range shown in the specification table is an assessment boundary, not a stock list of every possible combination.
Can you assess an M6 × 80 mm black socket screw?
Yes. Send the drawing for an engineering assessment. M6 × 200 mm is a starting point for discussion; feasibility depends on the material, head and socket geometry, shank dimensions, thread length, finish and inspection requirements.
What should I consider for outdoor use?
Start with the exposure conditions: moisture, salt, chemicals, temperature, contact with other metals and the possibility of coating damage. Then compare a suitable material and treatment system against a defined acceptance requirement.
The material-specific finish options above provide discussion starting points. Outdoor durability cannot be inferred from a black color or from an unspecified salt-spray number, and laboratory test hours should not be converted directly into service-life promises.
Does a black finish identify the coating or corrosion resistance?
No. Similar black appearances can result from different surface-treatment systems. The finish specification needs the treatment name, base material, appearance requirements and any agreed performance test.
An approved color sample can help control appearance between orders. If corrosion testing is required, the method, sample condition and failure criteria are agreed separately. Photo matching alone does not identify the coating or validate its performance.
Can a long socket screw be made to a high-strength requirement?
High-strength projects are assessed against the material, screw dimensions, head and socket geometry, heat-treatment route and applicable test requirements. A property class is not automatically available in every extra-long configuration.
For zinc-based plated systems, pretreatment and hydrogen-embrittlement controls are also part of the process review. The required mechanical properties and test basis should be settled before the appearance treatment is selected.
What affects the quotation, sample plan and production schedule?
The main factors are part geometry, material availability, existing or new tooling, thread coverage, secondary operations, surface treatment, inspection requirements and quantity. A change in one of these factors can change the manufacturing route even when diameter and length remain the same.
Shi Shi Tong reviews these factors before confirming commercial terms. Share the current drawing revision, expected order quantity and any sample or delivery requirement. For a repeat order, identify whether dimensions, material, treatment or acceptance criteria have changed since the approved version.
Discuss Your Black Long Hex Socket Screw
Send your drawing or sample information and estimated quantity. We will review the screw configuration, manufacturing route, inspection needs and quotation requirements with you.
Contact Information
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info@fastenbydesign.com
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13143444311
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Building 9, Tantou First Industrial Zone, Songgang Street, Bao’an District, Shenzhen, Guangdong, China
