--- title: "Square Nut Spring Nut Block Nut with Spring Leaf" description: "Square Nut Spring Nut Block Nut with Spring Leaf — Nylon-Insert & All-Metal Lock Nuts. Material: Carbon Steel, Standard: DIN, GB. MOQ 1 piece, US$0.24 – 0.26." url: https://engineeringhardware.com/product/square-nut-spring-nut-block-nut-with-spring-leaf/ source: Engineering Hardware & Fasteners --- # Square Nut Spring Nut Block Nut with Spring Leaf [![Square Nut Spring Nut Block Nut with Spring Leaf](https://img.engineeringhardware.com/Square-Nut-Spring-Nut-Block-Nut-with-Spring-Leaf.webp)](https://img.engineeringhardware.com/Square-Nut-Spring-Nut-Block-Nut-with-Spring-Leaf.webp) - Standard & made-to-drawing parts - Checked before shipping - Air, sea & express delivery [Nuts › Nylon-Insert & All-Metal Lock Nuts](https://engineeringhardware.com/fastener-products/nuts/nylon-insert-all-metal-lock-nuts/) Updated 2026-11-04 · [Markdown version](https://engineeringhardware.com/product/square-nut-spring-nut-block-nut-with-spring-leaf.md) Model no. **F3601-M8** US$0.24 – 0.26 / piece MOQ 1 piece · Final price confirmed in your quote - **Material:** Carbon Steel - **Head Style:** Round - **Standard:** DIN, GB - **Grade:** 8.8 Get a quote [WhatsApp](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20Square%20Nut%20Spring%20Nut%20Block%20Nut%20with%20Spring%20Leaf%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fsquare-nut-spring-nut-block-nut-with-spring-leaf%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 | Carbon Steel | | Type | Round Head | | Model NO. | F3601-M8 | | Connection | Common Bolt | | Head Style | Round | | Standard | DIN, GB | | Grade | 8.8 | | Transport Package | Bag | | Specification | SGS | | Origin | China | | HS Code | 76042900 | | Production Capacity | 50000 PCS/Year | | P/N--JM | F3601-M8 | | Category | [Nylon-Insert & All-Metal Lock Nuts](https://engineeringhardware.com/fastener-products/nuts/nylon-insert-all-metal-lock-nuts/) | ## Technical parameters | Item | Spring Leaf Block / Roll-In T Slot Leaf Nut | | --- | --- | | P/N--JM: | F3601-M8 | | Material | Steel | | Slot | 10mm | | Surface treatment | Zinc Plating | | Thread | M8 | | Used for | 4545 | | Port | Shenzhen | | Payment terms | T/T,Paypal,Western Union | | Description | Spring block are used for low and mediu-duty applications. It can be inserted at the connection spot. A small spring leaf on the rear side keeps the block in the secured locked positional... | ## Description Square Nut Spring Nut Block Nut with Spring Leaf is part of our nylon-insert & all-metal lock nuts range (Nuts). ### Key details - **Type:** Round Head - **Standard:** DIN, GB - **Material:** Carbon Steel - **Grade:** 8.8 - **Head Style:** Round - **Connection:** Common Bolt - **P/N–JM:** F3601-M8 Available configurations include material, head style, standard and grade. 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$0.24 – 0.26 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 Square Nut Spring Nut Block Nut with Spring Leaf? The listed minimum order is 1 piece, at US$0.24 – 0.26 per piece. Smaller trial quantities or samples can be requested in your inquiry; Engineering Hardware & Fasteners confirms what is possible for your size. ### What are the main specifications of Square Nut Spring Nut Block Nut with Spring Leaf? Type: Round Head; Standard: DIN, GB; Material: Carbon Steel; Grade: 8.8; Head Style: Round; Connection: Common Bolt. The full specification table and any technical parameter tables are listed on this page. ### Can this product be customized (OEM)? Listed configurations include material, head style, standard and grade. 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 nylon-insert & all-metal lock nuts are available? The Nylon-Insert & All-Metal Lock Nuts category lists 2,493 products in different sizes, materials and finishes: [https://engineeringhardware.com/fastener-products/nuts/nylon-insert-all-metal-lock-nuts/](https://engineeringhardware.com/fastener-products/nuts/nylon-insert-all-metal-lock-nuts/) 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 Nylon-Insert & All-Metal Lock Nuts →](https://engineeringhardware.com/fastener-products/nuts/nylon-insert-all-metal-lock-nuts/) [![High Quality Lock Nut DIN6923 Carbon Steel Zinc Plated Hex Head Serrated Spinlock Flange Nut](https://img.engineeringhardware.com/High-Quality-Lock-Nut-DIN6923-Carbon-Steel-Zinc-Plated-Hex-Head-Serrated-Spinlock-Flange-Nut.webp)](https://engineeringhardware.com/product/high-quality-lock-nut-din6923-carbon-steel-zinc-plated-hex-head-serrated-spinlock/) Nylon-Insert & All-Metal Lock Nuts ### [High Quality Lock Nut DIN6923 Carbon Steel Zinc Plated Hex Head Serrated Spinlock Flange Nut](https://engineeringhardware.com/product/high-quality-lock-nut-din6923-carbon-steel-zinc-plated-hex-head-serrated-spinlock/) Round Head · DIN, ANSI, GB, JIS, GOST, BSW **US$0.036 – 0.36**MOQ 1,000 pieces [![M3 M4 M5 M6 M8 304 Stainless Steel Multi Tooth K-Lock 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