--- title: "Blackened / Round Cup Half Round Head Hexagon Socket Bolt" description: "Blackened / Round Cup Half Round Head Hexagon Socket Bolt — Hex-Head Bolts. MOQ 10,000 pieces, US$0.078 – 0.12." url: https://engineeringhardware.com/product/blackened-round-cup-half-round-head-hexagon-socket-bolt/ source: Engineering Hardware & Fasteners --- # Blackened / Round Cup Half Round Head Hexagon Socket Bolt [![Blackened / Round Cup Half Round Head Hexagon Socket Bolt](https://img.engineeringhardware.com/Blackened-Round-Cup-Half-Round-Head-Hexagon-Socket-Bolt.webp)](https://img.engineeringhardware.com/Blackened-Round-Cup-Half-Round-Head-Hexagon-Socket-Bolt.webp) - Standard & made-to-drawing parts - Checked before shipping - Air, sea & express delivery [Bolts › Hex-Head Bolts](https://engineeringhardware.com/fastener-products/bolts/hex-head-bolts/) Updated 2026-11-04 · [Markdown version](https://engineeringhardware.com/product/blackened-round-cup-half-round-head-hexagon-socket-bolt.md) Model no. **M4*40** US$0.078 – 0.12 / piece MOQ 10,000 pieces · Final price confirmed in your quote - **Head Style:** Round - **Standard:** DIN, GB, ANSI, BSW, JIS - **Grade:** 4.8 - **Head Type:** Phillips /Slotted /Hex /Round /Torx - **Surface Treatment:** Plain /Galvanized /Passivation /Dacromet - **Finish:** Baking Paint /Nylok Precote /Electrophoresis Black - **Package Size:** 23.00cm * 19.00cm * 23.00cm - **Material:** Carbon Steel Get a quote [WhatsApp](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20Blackened%20%2F%20Round%20Cup%20Half%20Round%20Head%20Hexagon%20Socket%20Bolt%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fblackened-round-cup-half-round-head-hexagon-socket-bolt%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. | M4*40 | | --- | --- | | Groove | Hexagon | | Connection | Common Bolt | | Head Style | Round | | Standard | DIN, GB, ANSI, BSW, JIS | | Grade | 4.8 | | Shipping Cost | to Be Negotiated | | Samples | to Be Negotiated | | Delivery Time | 20-30 Days | | Head Type | Phillips /Slotted /Hex /Round /Torx | | Certification | ISO9001, SGS | | Surface Treatment | Plain /Galvanized /Passivation /Dacromet | | Finish | Baking Paint /Nylok Precote /Electrophoresis Black | | Class/Gread | 3.6,4.8,5.6,6.8,8.8,9.8,10.9,12.9 | | Transport Package | Plastic Bag/Boxs /Cartons/Pallets/Customize | | Specification | M4*40 | | Origin | China | | Production Capacity | 50000000 PCS/Year | | Package Size | 23.00cm * 19.00cm * 23.00cm | | Package Gross Weight | 25.000kg | | Customization | Available | | Material | Carbon Steel | | Type | Fillister/Cup Head | | Shipping Cost | Contact the supplier about freight and estimated delivery time. | | Category | [Hex-Head Bolts](https://engineeringhardware.com/fastener-products/bolts/hex-head-bolts/) | ## Technical parameters | Item | Blackened / Round Cup Half Round Head Hexagon Socket Bolt | | --- | --- | | Head Type | Fillister/Cup Head | | Drive Style | Hexagon socket | | Material | Carbon Steel | | Finish | Blackening/Blackened finished | | Available Raw Material | Carbon steel | | Alloy steel | | | Stainless steel | | | Brass, Bronze, Aluminum | | | Standard | DIN,ANSI,ASTM,JIS,GB,ISO,NON-STANDARD | | Grade | 3.6/4.8/5.6 /6.8/8.8/9.8/10.9/12.9 | | Surface finishing | PlainGalvanized (various of color) ,Zinc-Plated (various of color)Nickel- Plated, Chrome-Plated, Oxide BlackPassivation, Dacromet, Nylok Precote,Baking Paint/Stoving Varnish,Electrophoresis Black | | Heat Treatment | Carburization or tempering or high-frequency quenching | | Packing | Plastic Bag/Boxes /Cartons/Pallets/Customize, or customer request | ## Description Blackened / Round Cup Half Round Head Hexagon Socket Bolt is part of our hex-head bolts range (Bolts). ### Key details - **Type:** Fillister/Cup Head - **Standard:** DIN, GB, ANSI, BSW, JIS - **Material:** Carbon Steel - **Grade:** 4.8 - **Head Type:** Phillips /Slotted /Hex /Round /Torx - **Head Style:** Round - **Groove:** Hexagon - **Surface Treatment:** Plain /Galvanized /Passivation /Dacromet Available configurations include head style, standard, grade, head type and surface treatment. 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$0.078 – 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 Blackened / Round Cup Half Round Head Hexagon Socket Bolt? The listed minimum order is 10,000 pieces, at US$0.078 – 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 Blackened / Round Cup Half Round Head Hexagon Socket Bolt? Type: Fillister/Cup Head; Standard: DIN, GB, ANSI, BSW, JIS; Material: Carbon Steel; Grade: 4.8; Head Type: Phillips /Slotted /Hex /Round /Torx; Head Style: Round. 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, head type and surface treatment. 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 hex-head bolts are available? The Hex-Head Bolts category lists 8,449 products in different sizes, materials and finishes: [https://engineeringhardware.com/fastener-products/bolts/hex-head-bolts/](https://engineeringhardware.com/fastener-products/bolts/hex-head-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 Hex-Head Bolts →](https://engineeringhardware.com/fastener-products/bolts/hex-head-bolts/) [![High Quality GB/T 5783-2000 Hex Bolt with All Thread](https://img.engineeringhardware.com/High-Quality-GB-T-5783-2000-Hex-Bolt-with-All-Thread.webp)](https://engineeringhardware.com/product/high-quality-gb-t-5783-2000-hex-bolt-with-all-thread/) Hex-Head Bolts ### [High Quality GB/T 5783-2000 Hex Bolt with All Thread](https://engineeringhardware.com/product/high-quality-gb-t-5783-2000-hex-bolt-with-all-thread/) Hexagon Head · DIN, ANSI **US$0.12**MOQ 1,000 pieces [![China Fastener Factory Sale Carbon Steel GB30 Hex Bolt for Building with Carbon 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[High Quality DIN933 Black M6 M12 Hexagonal Head Bolt Fastener](https://engineeringhardware.com/product/high-quality-din933-black-m6-m12-hexagonal-head-bolt-fastener/) Hexagon Head · Steel **US$0.012**MOQ 1,000 pieces **US$0.078 – 0.12**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%20Blackened%20%2F%20Round%20Cup%20Half%20Round%20Head%20Hexagon%20Socket%20Bolt%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fblackened-round-cup-half-round-head-hexagon-socket-bolt%2F)