Wholesale

Screw Sleeve Adapter Nut

-- Steady & Reliable Manufacturer --

Product Overview

This sleeve nut has internal threads at both ends, so it can join two threaded rods, studs or bolts end-to-end, or extend a bolt's reach through a panel or spacer. It functions as a coupling point rather than a reducer, letting two separate threaded parts be connected into one continuous fastening run.

We supply this sleeve nut to furniture hardware buyers extending leg bolts, and to general machinery and fixture builders who need to join threaded rod sections or connect two studs in a confined assembly space.

Specifications

ItemDetail
MaterialCarbon steel (zinc plated), 300 series stainless steel, or brass
DesignInternal thread at both ends, same or different sizes
Thread Size RangeM4 – M16 internal; other sizes on request
Body StyleRound barrel or hex body
Length OptionsShort coupling length through extended standoff lengths
Surface FinishZinc plate, passivated (stainless), or natural brass
Same/Different Size OptionEqual-thread coupling or stepped (different size each end)
PackagingPoly bag, inner box, export carton

Application Fields

  • ✓Extending furniture leg bolts
  • ✓Joining threaded rod sections end-to-end
  • ✓Connecting two studs or screws in confined assembly spaces
  • ✓Cabinet leveling foot extensions
  • ✓Machine fixture and jig assembly requiring a coupling point
  • ✓General maintenance repair joining two shorter bolts into one run

Key Advantages

  • Joins two threaded parts end-to-end, which is useful when a single bolt of the needed length is not available.
  • Available in equal-size or stepped thread combinations, so it can couple matching or different fastener sizes.
  • Round or hex body options let the buyer choose between a discreet appearance or wrench-driven installation.
  • Standard and extended lengths cover both a simple coupling and a longer standoff requirement.
  • Stainless and plated steel options match the sleeve's corrosion resistance to indoor or outdoor use.
Company Profile
Dongtai Jinzhize Metal Products Co., Ltd.
Dongtai Jinzhize Metal Products Co., Ltd.
As Screw Sleeve Adapter Nut Manufacturer and Screw Sleeve Adapter Nut Factory, Dongtai Jinzhize Metal Products Co., Ltd. is a specialized manufacturing facility dedicated to threaded connection products for the automotive and aerospace sectors. We primarily produce Helical Wire Inserts, Self-Tapping Inserts, Key Locking Inserts, Threaded Adapters, Oil Plugs, as well as matching installation taps and tools. Established in 2015, the company operates from a 10,000-square-meter-owned manufacturing plant equipped with hundreds of machine tools and automated production systems. Through years of development, we have built an experienced team of design, development, and production specialists, complemented by a rigorous quality management system and comprehensive after-sales service mechanism. Our products are widely utilized in the automotive industry (including engines and transmissions for both passenger and commercial vehicles), the aerospace industry, and rail vehicle manufacturing. With an annual output value of 153 million RMB in 2024, we possess the capability for a large-scale, stable supply. We are committed to providing customers with highly consistent, traceable products and reliable service support.
HISTORY
Evelopment Path
2015
The company was established, identifying threaded connection metal products as its core focus. It concentrated on the R&D and production of thread inserts and supporting tools, laid out related products, deeply cultivated the automotive and aviation fields, and built an initial production and product framework.

2016
Started the construction of its own factory, introduced machine tools and equipment, set up an initial team, completed small-batch trial production of core products, expanded nearby customers, and achieved initial breakthroughs in production capacity.

2017
Optimized product processes, conducted special R&D on products adapted for the automotive field, increased equipment investment, standardized procedures and established quality inspection processes, improved product qualification rates, and accumulated experience in supporting automotive components.

2018
Obtained ISO 9001 quality management system certification, improved the full-process quality control mechanism, enhanced product consistency and reliability, strengthened competitiveness, and expanded high-quality customer resources.

2019
Expanded the factory, added automated equipment to increase production capacity; set up R&D and production teams, promoted the R&D of non-standard customized products, optimized after-sales processes, and built an initial after-sales system.

2020
Expanded the core automotive industry market, initiated cooperation in the aviation and rail vehicle fields; optimized supply chain management to respond to raw material fluctuations and ensure stable production.

2021
Introduced digital production management tools to promote the upgrading of production automation; deepened cooperation with leading automotive component enterprises, optimized product structure and enriched product specifications.

2022
Put a 10,000-square-meter factory into use, equipped with hundreds of automated equipment to achieve large-scale production; optimized the full industrial chain process, improved after-sales services, and provided customized solutions.

2023
Developed thread inserts adapted for new energy vehicles, promoted the precision upgrading of products to meet aviation scenario requirements; initiated the construction of a quality traceability system and increased production capacity and market share.

2024
The output value reached 153 million yuan, with an annual production of 100 million automotive engine thread inserts and 50 million oil plugs; products were widely used in multiple fields, forming a traceable supply system and becoming a high-quality supplier in the segment.

2025
Promoted high-end system certification in the automotive and aviation fields; deepened digital transformation, improved production efficiency, shortened delivery cycles, and strengthened collaborative supply capacity.

2026
Developed special alloy thread inserts and expanded high-end segmented markets; improved green manufacturing, expanded overseas markets, promoted brand upgrading, and transformed into an integrated solution provider.

Corporate Highlights
Documenting the daily life and growth of Jinzhize—from production sites and quality inspections to training sessions and exhibition communications.
Every photo bears witness to our professionalism and collaboration.
  • Dongtai Jinzhize Metal Products Co., Ltd.
  • Dongtai Jinzhize Metal Products Co., Ltd.
  • Dongtai Jinzhize Metal Products Co., Ltd.
  • Dongtai Jinzhize Metal Products Co., Ltd.

Equipment & Tooling

We are equipped with comprehensive production facilities covering forming, machining, wire cutting, grinding, cleaning, assembly, and packaging. We enhance processing consistency through the management of tooling fixtures, cutting tools, and process parameters. Capable of quickly organizing process integration and production scheduling based on diverse product and order requirements, we ensure a stable production rhythm and reliable delivery.