--- title: "Stainless Steel Key Locking Threaded Inserts with Threads Unc 1 / 4-20" description: "Stainless Steel Key Locking Threaded Inserts with Threads Unc 1 / 4-20 — Thread Repair & Solid Threaded Inserts. MOQ 1 piece, US$0.06 – 0.18." url: https://engineeringhardware.com/product/stainless-steel-key-locking-threaded-inserts-with-threads-unc-1-4-20/ source: Engineering Hardware & Fasteners --- # Stainless Steel Key Locking Threaded Inserts with Threads Unc 1 / 4-20 [![Stainless Steel Key Locking Threaded Inserts with Threads Unc 1 / 4-20](https://img.engineeringhardware.com/Stainless-Steel-Key-Locking-Threaded-Inserts-with-Threads-Unc-1-4-20.webp)](https://img.engineeringhardware.com/Stainless-Steel-Key-Locking-Threaded-Inserts-with-Threads-Unc-1-4-20.webp) - Standard & made-to-drawing parts - Checked before shipping - Air, sea & express delivery [Threaded Inserts & Clinch Fasteners › Thread Repair & Solid Threaded Inserts](https://engineeringhardware.com/fastener-products/threaded-inserts-clinch-fasteners/thread-repair-solid-threaded-inserts/) Updated 2026-11-04 · [Markdown version](https://engineeringhardware.com/product/stainless-steel-key-locking-threaded-inserts-with-threads-unc-1-4-20.md) Model no. **M1.2-M100** | **US$0.18**1–9 pieces | **US$0.11**10–99 pieces | **US$0.096**100–999 pieces | **US$0.06**1,000+ pieces | | --- | --- | --- | --- | MOQ 1 piece · Final price confirmed in your quote - **Material:** Stainless Steel - **Surface Finishing:** Zinc Plated - **Customized:** Customized - **Precision Grade:** 6h - **Length:** Customizable - **Temperature Tolerance:** 932fahrenheit-1382fahrenheit Get a quote [WhatsApp](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20Stainless%20Steel%20Key%20Locking%20Threaded%20Inserts%20with%20Threads%20Unc%201%20%2F%204-20%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fstainless-steel-key-locking-threaded-inserts-with-threads-unc-1-4-20%2F) Specifications are as listed for this product. Engineering Hardware & Fasteners confirms ratings, mating parts, compatibility, packing and lead time with you before you order. ## Specifications | Customization | Available | | --- | --- | | Material | Stainless Steel | | Type | Common | | Model NO. | M1.2-M100 | | Usage | Building, Machinery, Medical, Rocket, Shipping, Chemical | | Rotation Direction | Right Rotation | | Surface Finishing | Zinc Plated | | Certification | ISO, RoHS | | Customized | Customized | | Precision Grade | 6h | | Length | Customizable | | Installation Handle | Have | | Temperature Tolerance | 932fahrenheit-1382fahrenheit | | Transport Package | PE Bags+Cartons+Pallets | | Specification | Package 30cm x 26cm x 18cm | | Origin | China | | HS Code | 7318190000 | | Production Capacity | 3000000 Pieces/Day | | Category | [Thread Repair & Solid Threaded Inserts](https://engineeringhardware.com/fastener-products/threaded-inserts-clinch-fasteners/thread-repair-solid-threaded-inserts/) | ## Technical parameters | | Number of coil turns of the thread insert | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | | Specification | 1D | 1.5D | 2D | 2.5D | 3D | Outer diameter before installation | Drill bit diameter | | St1.6×0.35 | 3.1 | 4.5 | 6.2 | | | 2.1~2.3 | 1.6 | | St2×0.4 | 3.2 | 5.3 | 7.4 | 9.5 | 11.6 | 2.5~2.8 | 2.1 | | St2.5×0.45 | 3.6 | 5.9 | 8.2 | 10.5 | 12.8 | 3.2~3.5 | 2.6 | | St3×0.5 | 4.2 | 6.8 | 9.4 | 12 | 14.6 | 3.7~4.0 | 3.1 | | St4×0.7 | 4 | 6.6 | 9.1 | 11.7 | 14.2 | 5.0~5.3 | 4.2 | | St5×0.8 | 4.4 | 7.1 | 9.9 | 12.6 | 15.3 | 6.3~6.6 | 5.2 | | St6×1.0 | 4.3 | 6.9 | 9.6 | 12.2 | 14.9 | 7.5~7.9 | 6.3 | | St8×1.25 | 4.8 | 7.7 | 10.6 | 13.5 | 16.5 | 9.8~10.1 | 8.3 | | St10×1.5 | 5 | 8.1 | 11.2 | 14.2 | 17.3 | 12~12.5 | 10.4 | | St12×1.75 | 5.3 | 8.4 | 11.6 | 14.8 | 18 | 14.3~14.8 | 12.4 | | St14×2 | 5.4 | 8.7 | 11.9 | 15.2 | 18.40 | 16.7~17.2 | 14.5 | | St16×2 | 6.3 | 10.00 | 13.7 | 17.5 | 21.2 | 18.8~19.4 | 16.5 | ## Description Stainless Steel Key Locking Threaded Inserts with Threads Unc 1 / 4-20 is part of our thread repair & solid threaded inserts range (Threaded Inserts & Clinch Fasteners). ### Key details - **Type:** Common - **Material:** Stainless Steel - **Length:** Customizable - **Certification:** ISO, RoHS - **Usage:** Building, Machinery, Medical, Rocket, Shipping, Chemical - **Rotation Direction:** Right Rotation - **Surface Finishing:** Zinc Plated - **Precision Grade:** 6h Available configurations include material, surface finishing, customized, precision grade and length. Custom sizes, threads, materials, grades, platings and packaging can be quoted on request. ### Ordering through Engineering Hardware & Fasteners Minimum order is 1 piece at US$0.06 – 0.18 per piece. Send one inquiry with the part number, quantity and destination, and Engineering Hardware & Fasteners confirms size, thread, material, grade, finish, price, lead time and shipping, checks the goods before dispatch and ships them to you. ## Frequently asked questions ### What is the minimum order quantity (MOQ) for Stainless Steel Key Locking Threaded Inserts with Threads Unc 1 / 4-20? The listed minimum order is 1 piece, at US$0.06 – 0.18 per piece. Smaller trial quantities or samples can be requested in your inquiry; Engineering Hardware & Fasteners confirms what is possible for your size. ### How does the price change with quantity? Volume pricing: US$0.18 for 1–9 pieces; US$0.11 for 10–99 pieces; US$0.096 for 100–999 pieces; US$0.06 for 1,000+ pieces. Final prices depend on size, material, finish and packing and are confirmed in your quote. ### What are the main specifications of Stainless Steel Key Locking Threaded Inserts with Threads Unc 1 / 4-20? Type: Common; Material: Stainless Steel; Length: Customizable; Certification: ISO, RoHS; Usage: Building, Machinery, Medical, Rocket, Shipping, Chemical; Rotation Direction: Right Rotation. The full specification table and any technical parameter tables are listed on this page. ### Can this product be customized (OEM)? Listed configurations include material, surface finishing, customized, precision grade and length. Size, thread, length, material and grade, surface finish, head marking, packaging and labels can be quoted to your specification or drawing. ### What is the lead time and how is it shipped? Lead time depends on quantity and customization and is confirmed in your quote. Engineering Hardware & Fasteners checks the goods before dispatch and ships by express, air or sea; mixed orders can be consolidated in one shipment. ### Which other thread repair & solid threaded inserts are available? The Thread Repair & Solid Threaded Inserts category lists 961 products in different sizes, materials and finishes: [https://engineeringhardware.com/fastener-products/threaded-inserts-clinch-fasteners/thread-repair-solid-threaded-inserts/](https://engineeringhardware.com/fastener-products/threaded-inserts-clinch-fasteners/thread-repair-solid-threaded-inserts/) How we work ## Specified, checked and shipped by Engineering Hardware & Fasteners Engineering Hardware & Fasteners supplies bolts, screws, nuts, washers, anchors, rivets and fastening hardware to equipment makers, contractors, distributors and maintenance teams. Orders go through one controlled process: size, thread, material, grade and finish confirmed, samples approved, dimensions, thread fit and plating checked before packing, then packed for export — standard or made to drawing. - DIN, ISO, ASTM, ANSI, JIS and GB standard parts - Non-standard parts made to your drawing - Dimensions, thread gauges and plating checked before packing - Export cartons and pallets, consolidated mixed orders - Samples available for approval before mass production [![Production floor](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-01-production-floor-1024x683.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-01-production-floor.webp) Production floor [![Inspection bench](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-02-inspection-bench-768x512.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-02-inspection-bench.webp) Inspection bench [![Sorting & packing](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-03-sorting-and-packing-768x512.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-03-sorting-and-packing.webp) Sorting & packing [![Parts warehouse](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-04-parts-warehouse-768x512.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-04-parts-warehouse.webp) Parts warehouse [![Sample review](https://engineeringhardware.com/wp-content/uploads/2026/11/office-02-office-sample-review-768x512.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/office-02-office-sample-review.webp) Sample review [![Sales office](https://engineeringhardware.com/wp-content/uploads/2026/11/office-01-daily-sales-office-768x512.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/office-01-daily-sales-office.webp) Sales office [More about us →](https://engineeringhardware.com/about/) · [Request a sample or custom quote →](https://engineeringhardware.com/contact/) ## Request a quote for this product ## Related products [All Thread Repair & Solid Threaded Inserts →](https://engineeringhardware.com/fastener-products/threaded-inserts-clinch-fasteners/thread-repair-solid-threaded-inserts/) [![M2/M3/M4/M5/M6/M8 Zinc Plated Slotted Thread Sleeve Screw Self Tapping Threaded Insert](https://img.engineeringhardware.com/M2-M3-M4-M5-M6-M8-Zinc-Plated-Slotted-Thread-Sleeve-Screw-Self-Tapping-Threaded-Insert.webp)](https://engineeringhardware.com/product/m2-m3-m4-m5-m6-m8-zinc-plated-slotted-thread-sleeve-screw-self-tapping-threaded/) Thread Repair & Solid Threaded Inserts ### [M2/M3/M4/M5/M6/M8 Zinc Plated Slotted Thread Sleeve Screw Self Tapping Threaded Insert](https://engineeringhardware.com/product/m2-m3-m4-m5-m6-m8-zinc-plated-slotted-thread-sleeve-screw-self-tapping-threaded/) Round Head · DIN, GB, ANSI, BSW, JIS, GOST **US$0.0144 – 0.024**MOQ 10,000 pieces [![Fasteners Key Locking Insert 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