Screws
Long Screw
Accurate Fastners manufactures and supplies Long Screws suitable for industrial assemblies requiring extended fastening reach. Material grades and size specifications are confirmed directly with the sales team on enquiry.
- Standard
- —
- Grades
- On enquiry
- Size
- M4–8 mm
- Length
- Up to 150 mm
Verification note: Listed in the brochure as "Long Screw" without grade or size data. Specifications require confirmation.
Overview
What is the Long Screw?
A long screw is a threaded fastener distinguished by a shaft length that significantly exceeds that of a standard screw of the same diameter. This extended geometry allows it to pass through multiple components, thick substrates, or stacked layers in an assembly, creating a secure mechanical connection where shorter fasteners would be insufficient. The term 'long screw' is generally applied across several head styles and drive types, making it a versatile category rather than a single fixed product.
The defining structural characteristic of a long screw is the ratio of its shank length to its thread diameter. Depending on head type, the screw may feature a fully threaded shank or a partially threaded shank with a smooth grip section near the head. The grip section, when present, resists shear forces within the joint, while the threaded portion engages the receiving material. Drive formats may include slotted, Phillips, hexagonal or other configurations depending on the application requirement.
Long screws are commonly produced to dimensional and mechanical standards such as IS, BS, or DIN, which govern thread form, pitch, head dimensions, and mechanical properties. At Accurate Fastners, the quality control team performs checks during both procurement of raw materials and at the delivery stage, aiming to ensure dimensional consistency. Because specifications such as grade, head type, thread form, and length for this product require confirmation, customers are encouraged to discuss their precise requirements with the sales team before ordering.
In Depth
Product description
Construction and Geometry
Long screws are characterised by a threaded cylindrical shank, an engaging drive head, and a length that may range well beyond standard catalogue screws of the same nominal diameter. The thread form—whether metric coarse, metric fine, or unified—defines the helix angle and pitch, which in turn influence how the fastener advances per revolution and how it distributes clamping load across the engaged threads.
Head geometry varies considerably within this category. Countersunk heads allow a flush or sub-flush finish, pan and cheese heads sit proud of the surface and distribute load over a broader bearing area, while hexagonal heads facilitate higher installation torque using spanners. The interaction between head style and the mating component's countersink or clearance hole is an important detail to confirm when specifying a long screw for any given assembly.
Functional Behaviour in an Assembly
When tightened, a long screw generates a clamping force that holds the assembled components together through friction and thread engagement. The extended length means that a greater proportion of the shank may pass through clearance holes in one or more intermediate components before threading into the receiving substrate or a nut. This geometry may help maintain alignment across layered assemblies, particularly where multiple panels or brackets must be clamped simultaneously.
The grip length—the unthreaded portion of the shank between the head and the threaded section—plays an important mechanical role. It typically occupies the clearance holes of the through-components, preventing those components from being damaged by thread engagement and allowing the joint to be designed so that clamping force, rather than thread friction alone, holds the members together. Selecting the correct grip length relative to the combined thickness of through-components is therefore a practical assembly consideration.
How Long Screws Differ from Similar Fasteners
Long screws are often distinguished from bolts by the absence of a nut in many applications: the screw threads directly into a tapped hole or a self-contained insert. They differ from studs, which are headless and threaded at both ends, and from thread bars, which are continuously threaded rod stock cut to length. The head and drive feature on a long screw allows it to be driven from one side without access to the opposite face of the assembly.
Compared to short screws of identical diameter and thread form, a long screw provides deeper thread engagement in the receiving material, which may be relevant where the substrate material has lower pull-out resistance, such as aluminium, thermoplastics, or thin-walled sections. The appropriate length is typically determined by the required depth of thread engagement, the combined thickness of the clamped materials, and any design allowances specified in the relevant standard.
Material & Grade
Material and grade information
Material grades and specific alloy designations for this product must be confirmed with the Accurate Fastners sales team, as no grade data has been published in the current brochure listing. Generally, stainless steel grades used in industrial screws may include austenitic grades such as SS 304 and SS 316. SS 304 is commonly used in general indoor or mildly corrosive environments, while SS 316 typically offers improved resistance to chlorides due to its molybdenum content. SS 202 is sometimes selected for cost-sensitive applications with moderate corrosion exposure.
For any specific application, the grade selection may depend on the operating environment, the nature of the substances the fastener contacts, the mechanical load requirements, and compatibility with the mating component material to avoid galvanic corrosion. Accurate Fastners sources raw materials from established suppliers and carries out quality checks during procurement. Customers should share their environmental and load conditions when requesting a quotation so that the most appropriate material can be recommended by the technical sales team.
Grades shown are those documented for this product in the Accurate Fastners brochure. General material notes are guidance only; confirm grade selection for your environment.
Technical Data
Technical specifications
| Product type | Screw – Long Screw |
|---|---|
| Material | To be confirmed on enquiry |
| Material grade | To be confirmed on enquiry |
| Nominal diameter / size | M4–8 mm |
| Length | Up to 150 mm |
| Head / form | Various |
Sizes
Available sizes
Documented size range
M4–8 mm
Documented length range
Up to 150 mm
Individual sizes within the documented range, thread pitches and lengths are confirmed at quotation stage.
Applications
Industrial applications
Solar Energy Structures
Long screws may be used to fasten mounting rails, brackets, and panel frames in solar energy installations, where extended fastening depth through thick aluminium extrusions or structural sections is commonly required.
Food and Beverage Machinery
In food and beverage equipment, long screws in suitable stainless steel grades may help secure panels, guards, and structural members where corrosion resistance and cleanability are practical considerations for the assembly.
Pharmaceutical Machinery
Long screws may assist in assembling pharmaceutical processing equipment enclosures and frames, where fasteners must pass through multiple structural layers and material compatibility with hygienic operating environments is a relevant selection factor.
LED Lighting Fixtures
Extended-length screws are sometimes used in LED lighting assemblies to secure heat sinks, driver housings, or mounting arms to structural supports, particularly where the combined component thickness exceeds standard screw lengths.
Submersible Pump Assemblies
Long screws may be used in submersible pump housings and casing assemblies to clamp thick sections securely, with stainless steel grades potentially offering durability in wet or submerged service environments.
Features & Selection
Features and selection considerations
Design features
Extended Shank Length
The defining feature of a long screw is its shaft length, which allows it to span multiple components or thick substrates in a single fastener, reducing the need for intermediate connectors or spacers.
Various Head Types Available
Accurate Fastners lists long screws with various head types, allowing selection of countersunk, pan, hexagonal, or other profiles to suit the specific installation geometry and drive tool requirements.
Defined Thread Engagement
The threaded portion of the shank provides controlled engagement in the receiving material or nut, with thread pitch and form chosen to suit the load conditions and the material into which the screw drives.
Quality-Checked Raw Materials
Accurate Fastners' quality control team performs checks during raw material procurement, aiming to maintain dimensional consistency and material integrity before screws reach the production and despatch stages.
Standard-Compliant Manufacture
Long screws from Accurate Fastners are produced in accordance with recognised standards such as IS, BS, or DIN where applicable, supporting dimensional interchangeability with other compliant components in an assembly.
Before you order
Length and Grip Specification
Confirm the total clamped thickness of all through-components and add the required thread engagement depth in the receiving material. Share both dimensions when enquiring so the appropriate overall screw length can be recommended.
Thread Form and Pitch
Specify whether metric coarse, metric fine, or another thread system is required, and confirm the nominal diameter. Mismatched thread forms between the screw and receiving hole may prevent correct assembly or compromise joint integrity.
Material Grade and Environment
Describe the operating environment, including exposure to moisture, chemicals, or food-grade requirements. The sales team can then advise which stainless steel grade may be appropriate, as grade data for this product is confirmed on enquiry.
Quantity and Documentation
Provide the required quantity and indicate whether material test reports, dimensional inspection records, or compliance documentation to a particular standard are needed, as these details may affect lead time and order processing.
FAQs
Frequently asked questions
What industries are Accurate Fastners long screws typically supplied to?
Long screws from Accurate Fastners have been supplied for use in solar energy, food and beverage machinery, pharmaceutical equipment, LED lighting, and submersible pump assemblies, among other industrial sectors served by the company.
Which material grades are available for long screws?
Grade data for this product is not published in the current brochure and must be confirmed with the sales team. Please contact Accurate Fastners via the enquiry form, email export@accuratefastners.com, or WhatsApp to discuss your material requirements.
What size range do your long screws come in?
Sizes for long screws are confirmed on enquiry, as they are not listed in the current published data. Share your nominal diameter, required length, and thread pitch with the team to receive accurate availability and lead-time information.
To which standards are the long screws manufactured?
Accurate Fastners' fastener range is produced in compliance with standards such as IS, BS, and DIN where applicable. The specific standard relevant to your long screw can be discussed with the sales team when you raise an enquiry.
Do long screws require a nut or additional hardware?
Long screws may be used with a nut and washer combination or may thread directly into a tapped hole or insert, depending on the joint design. Related items such as stainless steel nuts and washers are available from Accurate Fastners' broader product range.
How do I request a quotation for long screws?
You may submit a request through the enquiry form on this website, send your specifications by email to export@accuratefastners.com, or reach the team via WhatsApp. Please include thread form, diameter, required length, grade preference, and quantity when enquiring.
Related Products
Complementary fasteners
- DIN 912304 · 316 · 202
DIN 912 Socket Head Cap Screw (Allen Cap Screw)
Size: M3 – M16
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