--- title: "Black High Strength Hex Socket Bolt/Galvanized / Stainless Steel Round Head Hex Socket Bolt" description: "Black High Strength Hex Socket Bolt/Galvanized / Stainless Steel Round Head Hex Socket B… — Structural & Heavy Hex Bolts. MOQ 5,000 pieces, US$0.012 – 0.12." url: https://engineeringhardware.com/product/black-high-strength-hex-socket-bolt-galvanized-stainless-steel-round-head-hex-socket/ source: Engineering Hardware & Fasteners --- # Black High Strength Hex Socket Bolt/Galvanized / Stainless Steel Round Head Hex Socket Bolt [![Black High Strength Hex Socket Bolt/Galvanized / Stainless Steel Round Head Hex Socket Bolt](https://img.engineeringhardware.com/Black-High-Strength-Hex-Socket-Bolt-Galvanized-Stainless-Steel-Round-Head-Hex-Socket-Bolt.webp)](https://img.engineeringhardware.com/Black-High-Strength-Hex-Socket-Bolt-Galvanized-Stainless-Steel-Round-Head-Hex-Socket-Bolt.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-high-strength-hex-socket-bolt-galvanized-stainless-steel-round-head-hex-socket.md) Model no. **M3-M20** US$0.012 – 0.12 / piece MOQ 5,000 pieces · Final price confirmed in your quote - **Material:** Stainless Steel - **Head Style:** Round - **Standard:** DIN, ANSI, GB, JIS, BSW, GOST - **Grade:** 12.9 - **Finish:** Polishing - **Carbon Steel Grade:** 4.8 6.8 8.8 10.9 12.9 - **Bolt Material:** Carbon Steel, Stainless Steel, High Carbon Steel - **Surface Coating:** Galvanized / Hot DIP Galvanized / Black 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%20High%20Strength%20Hex%20Socket%20Bolt%2FGalvanized%20%2F%20Stainless%20Steel%20Round%20Head%20Hex%20Socket%20Bolt%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fblack-high-strength-hex-socket-bolt-galvanized-stainless-steel-round-head-hex-socket%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 | Round Head | | Model NO. | M3-M20 | | Connection | Hinged Bolts | | Head Style | Round | | Standard | DIN, ANSI, GB, JIS, BSW, GOST | | Grade | 12.9 | | Application | Machinery, Chemical Industry, Environmental, Building | | Finish | Polishing | | Carbon Steel Grade | 4.8 6.8 8.8 10.9 12.9 | | Bolt Material | Carbon Steel, Stainless Steel, High Carbon Steel | | Surface Coating | Galvanized / Hot DIP Galvanized / Black | | Transport Package | Export Packing | | Specification | Can be customized | | Origin | Hebei | | HS Code | 7318151090 | | Production Capacity | 100000000 | | Category | [Structural & Heavy Hex Bolts](https://engineeringhardware.com/fastener-products/bolts/structural-heavy-hex-bolts/) | ## Technical parameters | specification table | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Stainless steel hexagon bolt | | | | | | | | | | Screw diametet ( d) | Coarse thread distance ( P ) | Head outside diameter (dk) | Head thickness (k) | Hexagon opposite side (s) | Hexagonal hole depth ( t ) | | | | | max | min | max | min | max | min | min | | | | :mm | | | | | | | | | | M1.4 | 0.3 | 2.74 | 2.46 | 1.4 | 1.26 | 1.36 | 1.32 | 0.6 | | M1.6 | 0.35 | 3.14 | 2.86 | 1.6 | 1.46 | 1.56 | 1.52 | 0.7 | | M2 | 0.4 | 3.98 | 3.62 | 2 | 1.86 | 1.56 | 1.52 | 1 | | M2.5 | 0.45 | 4.68 | 4.32 | 2.5 | 2.36 | 2.06 | 2.02 | 1.1 | | M3 | 0.5 | 5.68 | 5.32 | 3 | 2.86 | 2.58 | 2.52 | 1.3 | | M4 | 0.7 | 7.22 | 6.78 | 4 | 3.82 | 3.08 | 3.02 | 2 | | M5 | 0.8 | 8.72 | 8.28 | 5 | 4.82 | 4.095 | 4.02 | 2.5 | | M6 | 1 | 10.22 | 9.78 | 6 | 5.7 | 5.14 | 5.02 | 3 | | M8 | 1.25 | 13.27 | 12.73 | 8 | 7.64 | 6.14 | 6.02 | 4 | | M10 | 1.5 | 16.27 | 15.73 | 10 | 9.64 | 8.175 | 8.025 | 5 | | M12 | 1.75 | 18.27 | 17.73 | 12 | 11.57 | 10.18 | 10.03 | 6 | | M14 | 2 | 21.33 | 20.67 | 14 | 12.57 | 12.21 | 12.03 | 7 | | M16 | 2 | 24.33 | 23.67 | 16 | 15.57 | 14.21 | 14.03 | 8 | | M18 | 2.5 | 27.33 | 26.67 | 18 | 17.57 | 14.21 | 14.03 | 9 | | M20 | 2.5 | 30.33 | 19.67 | 20 | 19.48 | 17.23 | 17.05 | 10 | | M22 | 2.5 | 33.39 | 32.61 | 22 | 21.48 | 17.23 | 17.05 | 11 | | M24 | 3 | 36.36 | 35.61 | 24 | 23.48 | 19.28 | 19.07 | 12 | | M27 | 3 | 40.39 | 39.61 | 27 | 26.48 | 19.28 | 19.07 | 13.5 | | M30 | 3.5 | 45.39 | 44.61 | 30 | 29.48 | 22.28 | 22.07 | 15.6 | ## Description Black High Strength Hex Socket Bolt/Galvanized / Stainless Steel Round Head Hex Socket Bolt is part of our structural & heavy hex bolts range (Bolts). ### Key details - **Type:** Round Head - **Standard:** DIN, ANSI, GB, JIS, BSW, GOST - **Material:** Stainless Steel - **Grade:** 12.9 - **Head Style:** Round - **Finish:** Polishing - **Connection:** Hinged Bolts - **Application:** Machinery, Chemical Industry, Environmental, Building Available configurations include material, head style, standard, grade and finish. Custom sizes, threads, materials, grades, platings and packaging can be quoted on request. ### Ordering through Engineering Hardware & Fasteners Minimum order is 5,000 pieces at US$0.012 – 0.12 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 High Strength Hex Socket Bolt/Galvanized / Stainless Steel Round Head Hex Socket Bolt? The listed minimum order is 5,000 pieces, at US$0.012 – 0.12 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 High Strength Hex Socket Bolt/Galvanized / Stainless Steel Round Head Hex Socket Bolt? Type: Round Head; Standard: DIN, ANSI, GB, JIS, BSW, GOST; Material: Stainless Steel; Grade: 12.9; Head Style: Round; Finish: Polishing. 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, grade and finish. 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/) [![High Strength 10.9 Grade, 12.9 Grade Counter Sink Bolt Head Screw with Serrated](https://img.engineeringhardware.com/High-Strength-10-9-Grade-12-9-Grade-Counter-Sink-Bolt-Head-Screw-with-Serrated.webp)](https://engineeringhardware.com/product/high-strength-10-9-grade-12-9-grade-counter-sink-bolt-head-screw-with-serrated/) Structural & Heavy Hex Bolts ### [High Strength 10.9 Grade, 12.9 Grade Counter Sink Bolt Head Screw with Serrated](https://engineeringhardware.com/product/high-strength-10-9-grade-12-9-grade-counter-sink-bolt-head-screw-with-serrated/) Round Head · DIN, GB, ANSI, BSW, JIS **US$1,200 – 2,400**MOQ 1 ton [![M10~M120, 3/8″~5″ Carbon Steel, Alloy Stainless Corrugated High-Strength Bolts for Steel 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[Weather Resistant High-Strength Weather Resistant Half Threaded Bolt](https://engineeringhardware.com/product/weather-resistant-high-strength-weather-resistant-half-threaded-bolt/) Hexagon Head · DIN **US$0.12 – 1.20**MOQ 1 piece **US$0.012 – 0.12**MOQ 5,000 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%20High%20Strength%20Hex%20Socket%20Bolt%2FGalvanized%20%2F%20Stainless%20Steel%20Round%20Head%20Hex%20Socket%20Bolt%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fblack-high-strength-hex-socket-bolt-galvanized-stainless-steel-round-head-hex-socket%2F)