--- title: "Black Oxide Coated Heavy Hex Bolts" description: "Black Oxide Coated Heavy Hex Bolts — Structural & Heavy Hex Bolts. Material: Carbon Steel. MOQ 10,000 pieces, US$0.12 – 1.20." url: https://engineeringhardware.com/product/black-oxide-coated-heavy-hex-bolts/ source: Engineering Hardware & Fasteners --- # Black Oxide Coated Heavy Hex Bolts [![Black Oxide Coated Heavy Hex Bolts](https://img.engineeringhardware.com/Black-Oxide-Coated-Heavy-Hex-Bolts.webp)](https://img.engineeringhardware.com/Black-Oxide-Coated-Heavy-Hex-Bolts.webp) - Standard & made-to-drawing parts - Checked before shipping - Air, sea & express delivery [Bolts › Structural & Heavy Hex Bolts](https://engineeringhardware.com/fastener-products/bolts/structural-heavy-hex-bolts/) Updated 2026-11-04 · [Markdown version](https://engineeringhardware.com/product/black-oxide-coated-heavy-hex-bolts.md) Model no. **ASTM A325** US$0.12 – 1.20 / piece MOQ 10,000 pieces · Final price confirmed in your quote - **Material:** Carbon Steel - **Head Style:** Hexagonal - **Finish:** Black - **Packing:** Cartons+Plastic Bags - **Head Type:** Hexagon Flange Head - **Surface Treatment:** Black Oxide Get a quote [WhatsApp](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20Black%20Oxide%20Coated%20Heavy%20Hex%20Bolts%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fblack-oxide-coated-heavy-hex-bolts%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 | Hexagon Head | | Model NO. | ASTM A325 | | Head Style | Hexagonal | | Application | Machinery, Chemical Industry, Environmental, Building | | Finish | Black | | Packing | Cartons+Plastic Bags | | Head Type | Hexagon Flange Head | | Surface Treatment | Black Oxide | | Origin | Zhejiang, China | | Production Capacity | 100000 Piece/Pieces Per Month | | Category | [Structural & Heavy Hex Bolts](https://engineeringhardware.com/fastener-products/bolts/structural-heavy-hex-bolts/) | ## Technical parameters | item | value | | --- | --- | | Finish | Plain | | Material | Steel | | Place of Origin | China | | | Zhejiang | | Model Number | ASTM A325 | | Surface treatment | Black Oxide | | Application | Industry | | Packing | Cartons+plastic Bags | | Head type | Hexagon Flange Head | ## Description Black Oxide Coated Heavy Hex Bolts is part of our structural & heavy hex bolts range (Bolts). ### Key details - **Type:** Hexagon Head - **Material:** Carbon Steel - **Head Type:** Hexagon Flange Head - **Head Style:** Hexagonal - **Surface Treatment:** Black Oxide - **Finish:** Black - **Application:** Machinery, Chemical Industry, Environmental, Building - **Packing:** Cartons+Plastic Bags Available configurations include material, head style, finish, packing and head type. Custom sizes, threads, materials, grades, platings and packaging can be quoted on request. ### Ordering through Engineering Hardware & Fasteners Minimum order is 10,000 pieces at US$0.12 – 1.20 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 Black Oxide Coated Heavy Hex Bolts? The listed minimum order is 10,000 pieces, at US$0.12 – 1.20 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 Black Oxide Coated Heavy Hex Bolts? Type: Hexagon Head; Material: Carbon Steel; Head Type: Hexagon Flange Head; Head Style: Hexagonal; Surface Treatment: Black Oxide; Finish: Black. 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, finish, packing and head type. 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 structural & heavy hex bolts are available? The Structural & Heavy Hex Bolts category lists 2,565 products in different sizes, materials and finishes: [https://engineeringhardware.com/fastener-products/bolts/structural-heavy-hex-bolts/](https://engineeringhardware.com/fastener-products/bolts/structural-heavy-hex-bolts/) 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 Structural & Heavy Hex Bolts →](https://engineeringhardware.com/fastener-products/bolts/structural-heavy-hex-bolts/) [![Black Oxide Finish Hsfg Bolt F10t F8t Screws Used for Steel Structures](https://img.engineeringhardware.com/Black-Oxide-Finish-Hsfg-Bolt-F10t-F8t-Screws-Used-for-Steel-Structures.webp)](https://engineeringhardware.com/product/black-oxide-finish-hsfg-bolt-f10t-f8t-screws-used-for-steel-structures/) Structural & Heavy Hex Bolts ### [Black Oxide Finish Hsfg Bolt F10t F8t Screws Used for Steel Structures](https://engineeringhardware.com/product/black-oxide-finish-hsfg-bolt-f10t-f8t-screws-used-for-steel-structures/) Hexagon Head · DIN, ANSI, GB, JIS **US$0.24 – 1.80**MOQ 1,000 sets [![China Factory Supply Mild Steel High Strengthstainless Steel Hex Socket Head Cap Screw DIN912 for Machinery Allen 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Hardware Fastener](https://img.engineeringhardware.com/High-Strength-Hex-Head-Bolt-DIN933-Full-Thread-Carbon-Steel-Zinc-Plated-Hexagonal-Bolt-Industrial-Hardware-Fastener.webp)](https://engineeringhardware.com/product/high-strength-hex-head-bolt-din933-full-thread-carbon-steel-zinc-plated-hexagonal/) Structural & Heavy Hex Bolts ### [High Strength Hex Head Bolt DIN933 Full Thread Carbon Steel Zinc Plated Hexagonal Bolt Industrial Hardware Fastener](https://engineeringhardware.com/product/high-strength-hex-head-bolt-din933-full-thread-carbon-steel-zinc-plated-hexagonal/) Customized · DIN, ANSI, GB, JIS, BSW, GOST **US$0.012**MOQ 1,000 pieces **US$0.12 – 1.20**MOQ 10,000 piecesGet a quote[WA](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20Black%20Oxide%20Coated%20Heavy%20Hex%20Bolts%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fblack-oxide-coated-heavy-hex-bolts%2F)