Top 9 Long Screw Manufacturers in the World (2026 Guide)

For precision stainless socket screws, start with AMPG’s dimensional catalogue. For drawing-defined small-diameter extra-long fasteners, examine Shi Shi Tong’s engineering scope. For cold-forged metric flange designs, review WAS SHENG’s LO-01 offering. This guide compares 9 manufacturers with official long-screw evidence, while showing what each buyer still needs to verify.

The right long screw manufacturer depends on the joint: a machine-threaded screw crossing a metal assembly, an extended socket fastener, and a building screw are different purchasing requirements. Compare suppliers using the approved drawing and intended application, rather than length alone.

Scope: headed fastening screws and relevant custom long-bolt configurations. Ball screws, lead screws for motion, screw conveyors and long screwdrivers are outside this comparison. Leland is included as a building/industrial option and is labelled separately from machine-screw specialists.

How this shortlist was selected

The selected companies publish long-screw products and identifiable company information. The comparison prioritises product fit, technical detail and the manufacturing route relevant to an RFQ. It is an editorial shortlist, not a market-share or revenue ranking.

Published limits are company-reported and apply only within the conditions of the quoted product. Inclusion does not establish stock, delivery time, certification coverage or suitability for your assembly. Publisher disclosure: this guide appears on Shi Shi Tong’s website, and Shi Shi Tong is included in the comparison. Official pages were checked on 14 October 2026.

Compare long screw manufacturers at a glance

A larger advertised maximum is not proof of a better screw: it must be achievable at the required diameter, material, thread zone and tolerance.

1. AMPG

Operating and manufacturing base: Indianapolis, Indiana, United States

Best considered for: Precision stainless socket head screws

AMPG is a useful first option for buyers who need long stainless socket head cap screws with an inch-based specification. Its official catalog identifies extra-long, partially threaded versions in 18-8 and 316 stainless steel, with Class 3A thread fit and an under-head length datum.

The catalog describes CNC Swiss-lathe manufacture and special-order lengths up to 60 inches (1524 mm). That is a stated production capability, rather than evidence that every diameter and length is held in stock.

Buyer check: Ask AMPG to confirm the exact thread size, minimum thread length, straightness requirement and current availability. Its catalog gives buyers a more concrete starting point than a general custom-fastener enquiry.

Official sources: Long-screw product evidence · Company / location evidence · Homepage

2. Shi Shi Tong

Manufacturing base: Shenzhen, Guangdong, China

Best considered for: Drawing-defined small-diameter extra-long screws

Shi Shi Tong manufactures drawing-defined long and extra-long screws, including machine, socket and Phillips configurations. Its official long-screw page gives an evaluation range of M1.4–M12 and overall lengths up to 2000 mm, subject to the complete geometry, material, tolerance and manufacturing review.

The page explains that cold heading, multi-station forming, open-die forming, thread rolling and selected secondary machining are considered according to the design. It also presents a company-reported M6 × 272 mm socket head screw project for a battery-pack assembly.

Buyer check: Submit the complete drawing, thread zone, shank dimensions and inspection requirements. The advertised maximum length does not mean every diameter, material and tolerance combination is feasible.

Official sources: Long-screw product evidence · Company / location evidence · Homepage

3. WAS SHENG

Operating base: New Taipei City, Taiwan

Best considered for: Cold-forged metric hex flange configurations

WAS SHENG lists a specific LO-01 hex flange head metric extra-long screw rather than relying only on a broad fastener category. Its official product page describes cold forging with optional secondary machining, drilling and slot cutting.

The material choices include carbon and alloy steels, several stainless grades, brass, copper and aluminium. The company’s listed office is in New Taipei City; this address should not be treated as proof that every production operation takes place there.

Buyer check: For an LO-01 quotation, specify the head bearing surface, unthreaded shank, thread coverage and finished length. Request the manufacturing location and the achievable dimensional limits for the quoted version; the product page does not publish a universal maximum length.

Official sources: Long-screw product evidence · Company / location evidence · Homepage

4. Heatfastener

Company base: Shenzhen, Guangdong, China

Best considered for: Custom head, drive, material and thread combinations

Heatfastener, identified on its website as Shenzhen Heat Hardware Co., Ltd., has a dedicated long-screw product page. It describes Phillips, socket and slotted drive options, with stainless steel, carbon steel, alloy steel and other material choices.

Its published long-screw offering includes customised head, thread and length combinations, and advertises lengths up to 1990 mm. Those figures should be used to start a feasibility discussion, with the full drawing supplied before a production commitment.

Buyer check: Check the permitted diameter-to-length combination, full versus partial threading, material condition and inspection plan. Ask for current, entity-specific quality documentation rather than relying on older certification wording on the product page.

Official sources: Long-screw product evidence · Company / location evidence · Homepage

5. Taicang Jukairui Fasteners

Operating base: Taicang, Suzhou, Jiangsu, China

Best considered for: Extended socket screws and flange bolts

Taicang Jukairui’s official site presents long bolts and extra-long screws as core products. Its cylindrical-head hex-socket extension-screw page identifies alloy steel or stainless steel, a socket drive and customer-defined length.

The catalogue also separates extended hex-socket bolts, flange bolts and long hex-socket screws. That makes it a relevant candidate when the required head form is already decided and buyers want a drawing-based quotation.

Buyer check: Confirm the legal company name used in the quotation: the English website uses more than one transliteration. Also verify the applicable strength class, finished thread fit and coating. The public page does not establish a fixed maximum length or current stock.

Official sources: Long-screw product evidence · Company / location evidence · Homepage

6. Leland Industries

Head office and manufacturing base: Toronto, Ontario, Canada

Best considered for: Long screws for building and industrial programmes

Leland provides a different procurement route from the precision machine-screw specialists above. Its official announcement states that it manufactures screws of 1/4-inch diameter and lengths up to 12 inches. Its website places its head office and manufacturing plant in Toronto.

The wider product range serves agricultural storage, metal buildings and industrial applications. For buyers working with construction-related assemblies, its domestic North American manufacturing and coating options are relevant points to investigate.

Buyer check: The announcement does not identify the thread, point or head for every long-screw configuration. Request a product drawing and applicable installation or test documentation. Do not treat its building fasteners as automatic substitutes for machine-threaded screws in tapped metal parts.

Official sources: Long-screw product evidence · Company / location evidence · Homepage

7. HKTL Fastener / TONGLIN

Company and manufacturing locations: Hong Kong company address; mainland China manufacturing facility reported

Best considered for: Custom long screws for deep-hole connections

HKTL Fastener, branded as TONGLIN, identifies long screws for deep-hole connections on its screw product page. It lists carbon steel, stainless steel and alloy steel, with cold heading and turning among the manufacturing processes.

The site gives a Hong Kong company address and states that HK TONGLIN INTERNATIONAL LIMITED operates its own processing factory in mainland China. These are separate location claims; the Hong Kong address is not evidence of a Hong Kong screw factory.

Buyer check: The published length description is “several hundred millimetres”, without a precise size matrix. Ask for the manufacturing site, achievable finished length and drawing-specific mechanical requirements. Compare its quotation with the exact material and thread specification, not a generic strength label.

Official sources: Long-screw product evidence · Company / location evidence · Homepage

8. TYF / Guangdong Taiyuanfeng

Factory and contact location: Yangjiang, Guangdong, China

Best considered for: Custom long knurled socket head screws

TYF’s official catalogue includes Long Knurled Socket Head Cap Screws. The company identifies itself as Guangdong Taiyuanfeng Metal Products Co., Ltd., with a Yangjiang factory and a drawing-based custom-fastener offering.

The product page discusses adjustable thread size, shank length, shoulder form and end details. Its general screw category describes cold heading, closed-die forming and thread rolling, giving buyers an identifiable manufacturing route to discuss.

Buyer check: Ask for the actual part drawing and sample before interpreting the knurled-head description. A socket head and a hand-operated thumb screw have different installation requirements. The public product page does not establish a maximum length, torque rating or stock position for the named part.

Official sources: Long-screw product evidence · Company / location evidence · Homepage

9. Prince Fastener

Sales/contact office: Shanghai, China

Best considered for: Custom screw programmes with varied head and thread forms

Prince Fastener explicitly includes long screws in its custom screw range, alongside machine, shoulder and special screws. Its official page lists configurable head styles, thread forms and surface treatments, supporting a custom-programme enquiry.

The contact page lists an office in Shanghai. That establishes a contact location; it does not identify the factory that will make a particular long-screw order. Its long-screw evidence is broader and less dimensional than AMPG’s catalogue or WAS SHENG’s LO-01 page.

Buyer check: Use Prince for a comparative RFQ when several custom geometries must be consolidated. Require confirmation of the producing factory, material grade, length capability and sample-inspection plan. No universal maximum length or ready-stock claim is made here.

Official sources: Long-screw product evidence · Company / location evidence · Homepage

Match the supplier to the assembly

Precision metal assemblies: compare AMPG’s catalogue dimensions with the drawing-based routes from Shi Shi Tong and WAS SHENG. A catalogue part is useful when its head, thread fit and shank already match; custom production is worth evaluating when they do not.

Extended socket and special geometries: include Jukairui, Heatfastener and HKTL in the RFQ where their published configurations match. For a knurled socket-head design, TYF provides a named product to discuss. Prince is a broader custom-programme option; require a factory and dimensional confirmation.

Building and industrial fixing: investigate Leland’s stated 1/4-inch long-screw capability. Ask which head, thread and point belong to the quoted product. Installation and load documentation must match the intended substrate and application.

What to put in a long-screw RFQ

Send all candidates the same specification so that quotes describe the same finished part. A drawing-based quotation should resolve the following before tooling or production is authorised:

• Nominal diameter and thread system, pitch or threads per inch, thread fit and effective threaded length.
• Overall or under-head length datum, unthreaded shank diameter, head geometry, drive and end features.
• Exact material grade and condition, applicable mechanical requirements and surface finish.
• Drawing-defined straightness/runout, dimensional tolerances, inspection references and acceptance criteria.
• Quantity, sample requirements, tooling ownership, producing legal entity and manufacturing location.
• Packaging that protects long shanks and threads, delivery terms, batch traceability and change-control expectations.

Approve samples against the drawing and the actual mating components before repeat production. Where the assembly is safety-critical, have the responsible engineer define the load, tightening and validation requirements. A published length range is not an engineering approval.

For a drawing review with the publisher, see custom long-screw options, learn about Shi Shi Tong, or send project requirements.

Frequently asked questions

What qualifies as a long screw?

There is no universal length threshold across all diameters and applications. For procurement, define the required reach and complete fastening geometry. A long machine screw, a structural wood screw and a ball screw should not be specified as interchangeable products.

Which manufacturer advertises the longest screws here?

Shi Shi Tong evaluates lengths up to 2000 mm, Heatfastener advertises up to 1990 mm, and AMPG describes special-order lengths up to 60 inches (1524 mm). These company-reported figures use different product scopes; they cannot be treated as like-for-like guarantees.

Are all these companies local to my country?

No. This is a worldwide shortlist. The location labels distinguish a company office from a manufacturing base. Ask for the producing factory, shipping origin, import terms and any verified local support relevant to your order.

Can I use a building screw in place of a long machine screw?

Only when the complete application specification permits it. A machine-threaded fastener for a tapped metal part and a screw intended to form or cut into a substrate use different mating conditions. Select the product by thread, material, joint and validation requirements.

What should I verify before placing a bulk order?

Confirm the drawing revision, producing entity, material documentation, sample results, inspection plan and delivery terms. Request current certificates only where required, checking that their scope covers the relevant site and process. Do not infer qualification from a homepage badge alone.

Choose a documented manufacturing route

Start with the suppliers whose published product evidence is closest to your drawing. Resolve thread coverage, head geometry, material and straightness in the RFQ, then compare sample results and the production plan. A useful shortlist narrows the enquiry; the approved part and verified supplier process determine the purchasing decision.