--- title: "Structural Tc Bolt – Round Head – ASTM" description: "Structural Tc Bolt – Round Head – ASTM — Structural & Heavy Hex Bolts. MOQ 5,000 boxes, US$0.012 – 1.20." url: https://engineeringhardware.com/product/structural-tc-bolt-round-head-astm/ source: Engineering Hardware & Fasteners --- # Structural Tc Bolt – Round Head – ASTM [![Structural Tc Bolt – Round Head – ASTM](https://img.engineeringhardware.com/Structural-Tc-Bolt-Round-Head-ASTM.webp)](https://img.engineeringhardware.com/Structural-Tc-Bolt-Round-Head-ASTM.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/structural-tc-bolt-round-head-astm.md) Model no. **twist off bolt hex bolt** US$0.012 – 1.20 / box MOQ 5,000 boxes · Final price confirmed in your quote - **Head Style:** Round - **Standard:** DIN, GB - **Grade:** 10.9 - **Surface Treatment:** Galvanized/Colored Zinc/Blue and White Zinc/Origi - **Package Size:** 32.00cm * 20.00cm * 15.00cm - **Material:** Carbon Steel - **Standard products:** 5-7 days - **Custom orders:** 15-25 days Get a quote [WhatsApp](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20Structural%20Tc%20Bolt%20%26%238211%3B%20Round%20Head%20%26%238211%3B%20ASTM%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fstructural-tc-bolt-round-head-astm%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 | Model NO. | twist off bolt hex bolt | | --- | --- | | Connection | Common Bolt | | Head Style | Round | | Standard | DIN, GB | | Grade | 10.9 | | Application | Machinery, Chemical Industry, Building | | OEM | Available | | Surface Treatment | Galvanized/Colored Zinc/Blue and White Zinc/Origi | | Delivery Date | Within 7 Days If in Stock | | Supply Ability | 10000000 Piece/Pieces Per Day | | Transport Package | Carton with Pallet | | Specification | M16-M36 | | Origin | China | | HS Code | 7318159001 | | Production Capacity | 5billion/Year | | Package Size | 32.00cm * 20.00cm * 15.00cm | | Package Gross Weight | 18.000kg | | Customization | Available | | Material | Carbon Steel | | Type | Hexagon Head | | Shipping Cost | Contact the supplier about freight and estimated delivery time. | | Please provide | Product specifications ( | | We accept | 30% deposit + 70% balance | | We offer multiple options | Sea shipping (FCL/LCL) - most economical | | Standard products | 5-7 days | | Custom orders | 15-25 days | | Category | [Structural & Heavy Hex Bolts](https://engineeringhardware.com/fastener-products/bolts/structural-heavy-hex-bolts/) | ## Technical parameters | Material | Carbon Steel | | --- | --- | | Type | TC bolts | | Finish | Black Coating. HDG.Dacromet.Zinc Coat | | Place of Origin | China | | Size | M12-M36 | | Length | 40mm-320mm | | Measurement system | Metric, Imperial (Inch) | | HS Code | 7318159001 | ## Description Structural Tc Bolt – Round Head – ASTM is part of our structural & heavy hex bolts range (Bolts). ### Key details - **Type:** Hexagon Head - **Standard:** DIN, GB - **Material:** Carbon Steel - **Grade:** 10.9 - **Head Style:** Round - **Surface Treatment:** Galvanized/Colored Zinc/Blue and White Zinc/Origi - **Connection:** Common Bolt - **Application:** Machinery, Chemical Industry, Building Available configurations include head style, standard, grade, surface treatment and package size. Custom sizes, threads, materials, grades, platings and packaging can be quoted on request. ### Ordering through Engineering Hardware & Fasteners Minimum order is 5,000 boxes at US$0.012 – 1.20 per box. 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 Structural Tc Bolt – Round Head – ASTM? The listed minimum order is 5,000 boxes, at US$0.012 – 1.20 per box. 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 Structural Tc Bolt – Round Head – ASTM? Type: Hexagon Head; Standard: DIN, GB; Material: Carbon Steel; Grade: 10.9; Head Style: Round; Surface Treatment: Galvanized/Colored Zinc/Blue and White Zinc/Origi. The full specification table and any technical parameter tables are listed on this page. ### Can this product be customized (OEM)? Listed configurations include head style, standard, grade, surface treatment and package size. 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/) [![ASTM A490/A325/F3125 Type-1 Heavy Hex Structural Bolts, Hexagon Structure Bolts M12-M36, High Strength Carbon Steel Bolts](https://img.engineeringhardware.com/ASTM-A490-A325-F3125-Type-1-Heavy-Hex-Structural-Bolts-Hexagon-Structure-Bolts-M12-M36-High-Strength-Carbon-Steel-Bolts.webp)](https://engineeringhardware.com/product/astm-a490-a325-f3125-type-1-heavy-hex-structural-bolts-hexagon-structure-bolts-m12/) Structural & Heavy Hex Bolts ### [ASTM A490/A325/F3125 Type-1 Heavy Hex Structural Bolts, Hexagon Structure Bolts M12-M36, High Strength Carbon Steel Bolts](https://engineeringhardware.com/product/astm-a490-a325-f3125-type-1-heavy-hex-structural-bolts-hexagon-structure-bolts-m12/) Hexagon Head · DIN, ANSI, GB, JIS, BSW **US$0.12**MOQ 1 piece [![A490 DIN 6927 Hex Flange Bolt and Nut for Structural Bolting](https://img.engineeringhardware.com/A490-DIN-6927-Hex-Flange-Bolt-and-Nut-for-Structural-Bolting.webp)](https://engineeringhardware.com/product/a490-din-6927-hex-flange-bolt-and-nut-for-structural-bolting/) Structural & Heavy Hex Bolts ### [A490 DIN 6927 Hex Flange Bolt and Nut for Structural Bolting](https://engineeringhardware.com/product/a490-din-6927-hex-flange-bolt-and-nut-for-structural-bolting/) Hexagon Head · DIN, ANSI, GB, JIS, BSW, GOST **US$0.096 – 0.14**MOQ 10,000 pieces [![Custom High-Strength Carbon Steel Railway Rails Fishtail Bolt Fish Bolt](https://img.engineeringhardware.com/Custom-High-Strength-Carbon-Steel-Railway-Rails-Fishtail-Bolt-Fish-Bolt.webp)](https://engineeringhardware.com/product/custom-high-strength-carbon-steel-railway-rails-fishtail-bolt-fish-bolt/) Structural & Heavy Hex Bolts ### [Custom High-Strength Carbon Steel Railway Rails Fishtail Bolt Fish 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M10](https://img.engineeringhardware.com/High-Strength-Full-Thread-Hexagonal-Bolt-Stainless-Steel-Fastener-M6-M8-M10.webp)](https://engineeringhardware.com/product/high-strength-full-thread-hexagonal-bolt-stainless-steel-fastener-m6-m8-m10/) Structural & Heavy Hex Bolts ### [High-Strength Full Thread Hexagonal Bolt Stainless Steel Fastener M6 M8 M10](https://engineeringhardware.com/product/high-strength-full-thread-hexagonal-bolt-stainless-steel-fastener-m6-m8-m10/) Hexagon Head With Flange · DIN, GB, ANSI, BSW, JIS, GOST **US$0.024 – 0.036**MOQ 10,000 pieces **US$0.012 – 1.20**MOQ 5,000 boxesGet a quote[WA](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20Structural%20Tc%20Bolt%20%26%238211%3B%20Round%20Head%20%26%238211%3B%20ASTM%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fstructural-tc-bolt-round-head-astm%2F)