--- title: "Steel Grade 8.8 Flat Head Socket Cap Screw Countersunk Bolts Black Oxidation Made in China" description: "Steel Grade 8.8 Flat Head Socket Cap Screw Countersunk Bolts Black Oxidation Made in China — Countersunk, Plow & Elevator Bolts. MOQ 10,000 pieces, US$0.024." url: https://engineeringhardware.com/product/steel-grade-8-8-flat-head-socket-cap-screw-countersunk-bolts-black-oxidation-made-in/ source: Engineering Hardware & Fasteners --- # Steel Grade 8.8 Flat Head Socket Cap Screw Countersunk Bolts Black Oxidation Made in China [![Steel Grade 8.8 Flat Head Socket Cap Screw Countersunk Bolts Black Oxidation Made in China](https://img.engineeringhardware.com/Steel-Grade-8-8-Flat-Head-Socket-Cap-Screw-Countersunk-Bolts-Black-Oxidation-Made-in-China.webp)](https://img.engineeringhardware.com/Steel-Grade-8-8-Flat-Head-Socket-Cap-Screw-Countersunk-Bolts-Black-Oxidation-Made-in-China.webp) - Standard & made-to-drawing parts - Checked before shipping - Air, sea & express delivery [Bolts › Countersunk, Plow & Elevator Bolts](https://engineeringhardware.com/fastener-products/bolts/countersunk-plow-elevator-bolts/) Updated 2026-11-03 · [Markdown version](https://engineeringhardware.com/product/steel-grade-8-8-flat-head-socket-cap-screw-countersunk-bolts-black-oxidation-made-in.md) US$0.024 / piece MOQ 10,000 pieces · Final price confirmed in your quote - **Material:** Carbon Steel - **Head Style:** Socket - **Standard:** DIN, ANSI, GB, JIS, BSW, GOST - **Grade:** 8.8 - **Finish:** Black - **Customized:** Support (Size/Grade/Surface/Head/Driver etc.) - **Package Size:** 26.00cm * 26.00cm * 10.00cm Get a quote [WhatsApp](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20Steel%20Grade%208.8%20Flat%20Head%20Socket%20Cap%20Screw%20Countersunk%20Bolts%20Black%20Oxidation%20Made%20in%20China%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fsteel-grade-8-8-flat-head-socket-cap-screw-countersunk-bolts-black-oxidation-made-in%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 | Countersunk Head | | Connection | Common Bolt | | Head Style | Socket | | Standard | DIN, ANSI, GB, JIS, BSW, GOST | | Grade | 8.8 | | Application | Machinery, Chemical Industry, Environmental, Building | | Finish | Black | | Service | Customized | | Customized | Support (Size/Grade/Surface/Head/Driver etc.) | | OEM ODM | Yes | | Transport Package | 26 * 26 * 10 Cartons in Bulk | | Specification | M3~M100 | | Origin | Made in China | | HS Code | 7315189001 | | Production Capacity | 220mpieces/Year | | Package Size | 26.00cm * 26.00cm * 10.00cm | | Package Gross Weight | 21.000kg | | Carton Box | Put into small boxes, then into the carton. The size of the small box can be customized. | | Category | [Countersunk, Plow & Elevator Bolts](https://engineeringhardware.com/fastener-products/bolts/countersunk-plow-elevator-bolts/) | ## Technical parameters | Product name | Socket countersunk head screws | | --- | --- | | Material | carbon steel, alloy steel, stainless steel, brass, aluminum, etc. | | Specifications | M5 X 10 or Customized | | Surface Treatment | Plain, Polished, Black, Phosphating and Blackening,Zinc Plated (white/blue/yellow),Nickel Plated, Chrome Plated, Dacromet,HDG (hot dip galvanizing),Greencate (powder zincification / sherardizing) | | Technology | Cold forging, Hot forming, Machining, Heat treatment, Staming, etc | | Grade | 4.8, 6.8, 8.8, 10.9, 12.9 / A2-50, A2-70, A4-70, A4-80HV100-140, HV150-200, HV200-300 | | Executive Standard | DIN, ANSI/ASTM, IFI, BS, GB, ISO, JIS, BA, etc. / Customized | | Package | Carton bulk, Carton box, Pallet, etc. | | Estimated delivery time | Negotiation required | | logistics mode | Cusomized | | LOGO customization | support | | Outer packaging customization | support | | Screw Thread | M3 | M4 | M5 | M6 | M8 | M10 | M12 | (M14) | M16 | M20 | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | d | | | | | | | | | | | | | | P | Pitch | | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 | | b | ref. | | 18 | 20 | 22 | 24 | 28 | 32 | 36 | 40 | 44 | 52 | | dk | theor. | max | 6.72 | 8.96 | 11.2 | 13.44 | 17.92 | 22.4 | 26.88 | 30.8 | 33.6 | 40.32 | | actual | min | 5.54 | 7.53 | 9.43 | 11.34 | 15.24 | 19.22 | 23.12 | 26.52 | 29.01 | 36.05 | | | ds | max | | 3 | 4 | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 20 | | min | | 2.86 | 3.82 | 4.82 | 5.82 | 7.78 | 9.78 | 11.73 | 13.73 | 15.73 | 19.67 | | | e | min | | 2.3 | 2.87 | 3.44 | 4.58 | 5.72 | 6.86 | 9.15 | 11.43 | 11.43 | 13.72 | | k | max | | 1.86 | 2.48 | 3.1 | 3.72 | 4.96 | 6.2 | 7.44 | 8.4 | 8.8 | 10.16 | | s | Nominal Size | | 2 | 2.5 | 3 | 4 | 5 | 6 | 8 | 10 | 10 | 12 | | max | 12.9 | 2.045 | 2.56 | 3.071 | 4.084 | 5.084 | 6.095 | 8.115 | 10.115 | 10.115 | 12.142 | | | Other property class | 2.06 | 2.58 | 3.08 | 4.095 | 5.14 | 6.14 | 8.175 | 10.175 | 10.175 | 12.212 | | | | min | | 2.02 | 2.52 | 3.02 | 4.02 | 5.02 | 6.02 | 8.025 | 10.025 | 10.025 | 12.032 | | | t | min | | 1.1 | 1.5 | 1.9 | 2.2 | 3 | 3.6 | 4.3 | 4.5 | 4.8 | 5.6 | | Minimum tensile load(N)-8.8 | | 3220 | 5620 | 9080 | 12900 | 23400 | 37100 | 53900 | 73600 | 100000 | 162000 | | | Minimum tensile load(N)-10.9 | | 4180 | 7300 | 11800 | 16700 | 30500 | 48200 | 70200 | 96000 | 130000 | 204000 | | | Minimum tensile load(N)-12.9 | | 4910 | 8560 | 13800 | 19600 | 35700 | 56600 | 82400 | 112000 | 154000 | 239000 | | | ,emin=1.14smin | | | | | | | | | | | | | | ,80% of the values specified in ISO 898-1 | | | | | | | | | | | | | ## Description Steel Grade 8.8 Flat Head Socket Cap Screw Countersunk Bolts Black Oxidation Made in China is part of our countersunk, plow & elevator bolts range (Bolts). ### Key details - **Type:** Countersunk Head - **Standard:** DIN, ANSI, GB, JIS, BSW, GOST - **Material:** Carbon Steel - **Grade:** 8.8 - **Head Style:** Socket - **Finish:** Black - **Connection:** Common Bolt - **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 10,000 pieces at US$0.024 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 Steel Grade 8.8 Flat Head Socket Cap Screw Countersunk Bolts Black Oxidation Made in China? The listed minimum order is 10,000 pieces, at US$0.024 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 Steel Grade 8.8 Flat Head Socket Cap Screw Countersunk Bolts Black Oxidation Made in China? Type: Countersunk Head; Standard: DIN, ANSI, GB, JIS, BSW, GOST; Material: Carbon Steel; Grade: 8.8; Head Style: Socket; 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, 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 countersunk, plow & elevator bolts are available? The Countersunk, Plow & Elevator Bolts category lists 533 products in different sizes, materials and finishes: [https://engineeringhardware.com/fastener-products/bolts/countersunk-plow-elevator-bolts/](https://engineeringhardware.com/fastener-products/bolts/countersunk-plow-elevator-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 & 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custom quote →](https://engineeringhardware.com/contact/) ## Request a quote for this product ## Related products [All Countersunk, Plow & Elevator Bolts →](https://engineeringhardware.com/fastener-products/bolts/countersunk-plow-elevator-bolts/) [![Two Triangular Fangs Flat Countersunk Elevator Bolts](https://img.engineeringhardware.com/Two-Triangular-Fangs-Flat-Countersunk-Elevator-Bolts.webp)](https://engineeringhardware.com/product/two-triangular-fangs-flat-countersunk-elevator-bolts/) Countersunk, Plow & Elevator Bolts ### [Two Triangular Fangs Flat Countersunk Elevator Bolts](https://engineeringhardware.com/product/two-triangular-fangs-flat-countersunk-elevator-bolts/) Hexagon Head · DIN **US$0.12 – 3.59**MOQ 100 sets [![DIN7991 A2-70 Hexagon Socket Countersunk Head Screws Flat Head Bolt Hex Socket Csk Head Machine 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