Wholesale

UNF Fine Pitch Wire Thread Insert

-- Steady & Reliable Manufacturer --

Product Overview

This insert is wound and ground to Unified Fine (UNF) thread pitch, giving finer thread engagement than the equivalent UNC size for applications where preload stability, precise adjustment, or a shallower thread depth is required. It is offered in both free-running and screw-lock configurations across common UNF callouts.

We supply this size range to buyers whose drawings specify UNF wire thread inserts directly, including hydraulic and pneumatic fitting bodies, optical and instrument housings, and aerospace hardware where the mating fastener is already a UNF part.

Specifications

Item Detail
Material 300 series stainless steel; phosphor bronze on request
Standard NASM8846, MIL-I-45914, IFI-536 (UNF series)
Thread Size Range #4-48 UNF – 1"-20 UNF; other UNF sizes on request
Type Free running and screw lock
Length Options 1D, 1.5D, 2D, 2.5D, 3D
Surface Finish Passivated, phosphate & oil, or silver plate
Pitch Tolerance Class 2B / 3B thread fit per ASME B1.1
Packaging Poly bag → inner box → export carton; reels for automatic feeders

Application Fields

  • ✓Hydraulic and pneumatic fitting bodies
  • ✓Optical and precision instrument housings
  • ✓Aerospace hardware using UNF fastener callouts
  • ✓Test equipment and lab instrumentation
  • ✓Fine-adjustment mechanical assemblies
  • ✓Defense and firearms-related hardware

Key Advantages

  • Finer thread engagement gives more consistent preload and less backlash than a coarser UNC thread at the same nominal diameter.
  • Matches UNF fastener hardware already specified on the drawing, avoiding a thread-series mismatch during assembly.
  • Available in the same free-running and screw-lock options as our UNC range, so locking performance is not traded off for pitch.
  • Suited to thinner wall sections, where a UNC coarse thread would remove too much surrounding material.
  • Consistent Class 2B/3B fit reduces rejection rates at incoming inspection.

Payment & Shipping

Payment Terms

  • T/T, L/C, PayPal and Trade Assurance accepted
  • 30% deposit, balance before shipment for new accounts
  • Sample orders can be paid by PayPal or courier freight-collect

Shipping & Packaging

  • Common UNF sizes: 7–15 days; less common sizes: 20–30 days
  • Sea freight for bulk orders, air freight for urgent restocks
  • Express courier available for sample and trial quantities
  • Reel packaging available for automatic feeder installation lines

If a specific UNF callout from your drawing is not listed, send us the size and we will confirm feasibility and lead time.

Frequently Asked Questions

  • Q: Do you stock UNF sizes or are they made to order?
  • A: Common UNF sizes are kept in stock; less common sizes are produced to order with a slightly longer lead time.
  • Q: What is the practical difference between a UNF and a UNC insert of the same nominal diameter?
  • A: The UNF insert has a finer pitch, which generally gives steadier preload and finer adjustment, while the UNC insert removes less material per thread and installs faster.
  • Q: Can UNF inserts be supplied in the screw-lock type as well?
  • A: Yes, UNF inserts are available in both free-running and screw-lock configurations.
  • Q: What thread class tolerance do these inserts hold?
  • A: They are held to a Class 2B/3B fit per ASME B1.1 unless a different class is specified.
  • Q: Can you match a specific UNF callout from our drawing that isn't listed here?
  • A: Yes, send us the exact thread callout and we will confirm whether it is a stock or made-to-order size.
Company Profile
Dongtai Jinzhize Metal Products Co., Ltd.
Dongtai Jinzhize Metal Products Co., Ltd.
As UNF Fine Pitch Wire Thread Insert Manufacturer and UNF Fine Pitch Wire Thread Insert 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.

Related Products

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.

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