--- title: "Gr4.8 Blue Galvanized Square Head Set Screw" description: "Gr4.8 Blue Galvanized Square Head Set Screw — Set, Grub & Socket Set Screws. MOQ 500 pieces, US$1.20 – 1.68." url: https://engineeringhardware.com/product/gr4-8-blue-galvanized-square-head-set-screw-2/ source: Engineering Hardware & Fasteners --- # Gr4.8 Blue Galvanized Square Head Set Screw [![Gr4.8 Blue Galvanized Square Head Set Screw](https://img.engineeringhardware.com/Gr4-8-Blue-Galvanized-Square-Head-Set-Screw-2.webp)](https://img.engineeringhardware.com/Gr4-8-Blue-Galvanized-Square-Head-Set-Screw-2.webp) - Standard & made-to-drawing parts - Checked before shipping - Air, sea & express delivery [Screws › Set, Grub & Socket Set Screws](https://engineeringhardware.com/fastener-products/screws/set-grub-socket-set-screws/) Updated 2026-11-04 · [Markdown version](https://engineeringhardware.com/product/gr4-8-blue-galvanized-square-head-set-screw-2.md) Model no. **bolt** US$1.20 – 1.68 / piece MOQ 500 pieces · Final price confirmed in your quote - **Aluminum grade:** 6061, 6063 Get a quote [WhatsApp](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20Gr4.8%20Blue%20Galvanized%20Square%20Head%20Set%20Screw%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fgr4-8-blue-galvanized-square-head-set-screw-2%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 | | --- | --- | | Transport Package | Cartons | | Specification | M6 M8 M10 M12 | | Model NO. | bolt | | Origin | Ningbo, Zhejiang | | HS Code | 8483109000 | | Production Capacity | 50000pieces/Yeae | | Carbon steel | 10#, 18#, 1018, 22#, 1022, 40Cr, 45#, 1045, 50#, 55#, 60#, 65Mn, 70#, 72B, 80#, 82B | | Alloy Structure Steel | B7, 20CrMo, 42Crmo, SCM415, SCM440, 4140 | | High-carbon chromium bearing steel | GCr15, 52100, SUJ2 | | Free-cutting steel | 12L14, 12L15 | | Stainless steel | 1Cr13, 2Cr13, 3Cr13, 4Cr13, 1Cr17, SUS410, SUS420, SUS430, SUS416, SUS440C, 17-4, 17-4PH, 130M, 200, 201, 202, 205, 303, 303Cu, 304, 316, 316L | | Aluminum grade | 6061, 6063 | | Brass | Hpb58-2.5 (C38000), Hpb59-1 (C37710), Hpb61-1 (C37100), Hpb62-0.8 (C35000), Hpb63-0.1 (C34900), Hpb63-3 (C34500), H60, H62, H63, H65 | | Category | [Set, Grub & Socket Set Screws](https://engineeringhardware.com/fastener-products/screws/set-grub-socket-set-screws/) | ## Technical parameters | Application | motor or electric motor | Certification | ISO | | --- | --- | --- | --- | | Material | carbon steel(According to Drawing) | Type | Motor shaft | | Size | According to Drawing | Diameter | 6-50mm | | Diameter Tolerance | 0.005mm | Length | 5-800mm | | Roughness | Ra0.05 | Transport Package | Plastic Bags Inside and Standard Cartons Outside | | Hardness | HRC | Origin | Ningbo, Zhejiang | | Material | Carbon steel: 10#, 18#, 1018, 22#, 1022, 40Cr, 45#, 1045, 50#, 55#, 60#, 65Mn, 70#, 72B, 80#, 82B Alloy Structure Steel: B7, 20CrMo, 42Crmo, SCM415, SCM440, 4140 High-carbon chromium bearing steel: GCr15, 52100, SUJ2 Free-cutting steel: 12L14, 12L15 Stainless steel: 1Cr13, 2Cr13, 3Cr13, 4Cr13, 1Cr17, SUS410, SUS420, SUS430, SUS416, SUS440C, 17-4, 17-4PH, 130M, 200, 201, 202, 205, 303, 303Cu, 304, | | --- | --- | | Diameter | 6-50mm | | Length | 5-800mm | | Diameter Tolerance | 0.005mm | | Hardness | HRC | | Heat treatment | 1. Oil Quenching 2. High frequency quenching 3. Carburization 4. Vacuum Heat treatment 5. Mesh belt furnace heat treatment | | Surface treatment | 1. Plating nickel 2. Plating zinc 3. Plating passivation 4. Plating phosphating 5. Black coating 6. Anodized treatment 7. | | Packing | Plastic bags inside and standard cartons outside. Shipment by pallets or according to customer's packing specifications | ## Description Gr4.8 Blue Galvanized Square Head Set Screw is part of our set, grub & socket set screws range (Screws). ### Key details - **Alloy Structure Steel:** B7, 20CrMo, 42Crmo, SCM415, SCM440, 4140 - **High-carbon chromium bearing steel:** GCr15, 52100, SUJ2 - **Free-cutting steel:** 12L14, 12L15 - **Aluminum grade:** 6061, 6063 Available configurations include aluminum grade. Custom sizes, threads, materials, grades, platings and packaging can be quoted on request. ### Ordering through Engineering Hardware & Fasteners Minimum order is 500 pieces at US$1.20 – 1.68 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 Gr4.8 Blue Galvanized Square Head Set Screw? The listed minimum order is 500 pieces, at US$1.20 – 1.68 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 Gr4.8 Blue Galvanized Square Head Set Screw? Alloy Structure Steel: B7, 20CrMo, 42Crmo, SCM415, SCM440, 4140; High-carbon chromium bearing steel: GCr15, 52100, SUJ2; Free-cutting steel: 12L14, 12L15; Aluminum grade: 6061, 6063. The full specification table and any technical parameter tables are listed on this page. ### Can this product be customized (OEM)? Listed configurations include aluminum grade. 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 set, grub & socket set screws are available? The Set, Grub & Socket Set Screws category lists 1,721 products in different sizes, materials and finishes: [https://engineeringhardware.com/fastener-products/screws/set-grub-socket-set-screws/](https://engineeringhardware.com/fastener-products/screws/set-grub-socket-set-screws/) 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 Set, Grub & Socket Set Screws →](https://engineeringhardware.com/fastener-products/screws/set-grub-socket-set-screws/) [![Stainless Steel Hexagon Socket Set Screws with Cup Point](https://img.engineeringhardware.com/Stainless-Steel-Hexagon-Socket-Set-Screws-with-Cup-Point.webp)](https://engineeringhardware.com/product/stainless-steel-hexagon-socket-set-screws-with-cup-point/) Set, Grub & Socket Set Screws ### [Stainless Steel Hexagon Socket Set Screws with Cup Point](https://engineeringhardware.com/product/stainless-steel-hexagon-socket-set-screws-with-cup-point/) Countersunk Head · DIN, ANSI **US$0.024 – 0.096**MOQ 3,000 pieces [![JIS B 1177 Stainless Steel Cone Point Hexagon Socket Set 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