--- title: "Threaded Hollow Bar/Self Drilling Anchor Bolt R51 for Micropile Foundation" description: "Threaded Hollow Bar/Self Drilling Anchor Bolt R51 for Micropile Foundation — Foundation & Anchor Bolts. Material: Steel. MOQ 2,000 meters, US$3.60 – 24.00." url: https://engineeringhardware.com/product/threaded-hollow-bar-self-drilling-anchor-bolt-r51-for-micropile-foundation/ source: Engineering Hardware & Fasteners --- # Threaded Hollow Bar/Self Drilling Anchor Bolt R51 for Micropile Foundation [![Threaded Hollow Bar/Self Drilling Anchor Bolt R51 for Micropile Foundation](https://img.engineeringhardware.com/Threaded-Hollow-Bar-Self-Drilling-Anchor-Bolt-R51-for-Micropile-Foundation.webp)](https://img.engineeringhardware.com/Threaded-Hollow-Bar-Self-Drilling-Anchor-Bolt-R51-for-Micropile-Foundation.webp) - Standard & made-to-drawing parts - Checked before shipping - Air, sea & express delivery [Anchors & Construction Fixings › Foundation & Anchor Bolts](https://engineeringhardware.com/fastener-products/anchors-construction-fixings/foundation-anchor-bolts/) Updated 2026-11-03 · [Markdown version](https://engineeringhardware.com/product/threaded-hollow-bar-self-drilling-anchor-bolt-r51-for-micropile-foundation.md) Model no. **R25, R32, R38, R51, T76** US$3.60 – 24.00 / meter MOQ 2,000 meters · Final price confirmed in your quote - **Surface Treatment:** Yes - **Material:** 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%20Threaded%20Hollow%20Bar%2FSelf%20Drilling%20Anchor%20Bolt%20R51%20for%20Micropile%20Foundation%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fthreaded-hollow-bar-self-drilling-anchor-bolt-r51-for-micropile-foundation%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 | | --- | --- | | Application | Construction | | Certification | ISO | | Model NO. | R25, R32, R38, R51, T76 | | Surface Treatment | Yes | | Technics | Hot Rolled | | Material | Steel | | Type | Rock Bolt | | Transport Package | Bundle | | Specification | R25, R32, R38, R51, T76 | | Origin | China | | HS Code | 7308400000 | | Production Capacity | 100000m | | Applications | It can be used as a drill pipe when drilling, and can be used as a grouting pipe during grouting. It can be used as a reinforcing rib after installation. | | Advantage | 1) High strength and quality material is selected, the hollow bar has high strength and plasticity; | | Category | [Foundation & Anchor Bolts](https://engineeringhardware.com/fastener-products/anchors-construction-fixings/foundation-anchor-bolts/) | ## Technical parameters | Type | Outer Dia.(mm) | Inner Dia.(mm) | Ultimate Load(KN) | Yield Load(KN) | Weight(kg/m) | | --- | --- | --- | --- | --- | --- | | R25N | 25 | 14 | 200 | 150 | 2.3 | | R32L | 32 | 22 | 260 | 200 | 2.8 | | R32N | 32 | 21 | 280 | 230 | 2.9 | | R32/18.5 | 32 | 18.5 | 280 | 230 | 3.4 | | R32S | 32 | 17 | 360 | 280 | 3.5 | | R38N | 38 | 21 | 500 | 400 | 4.8 | | R38/19 | 38 | 19 | 500 | 400 | 5.5 | | R51NL | 51 | 36 | 550 | 450 | 6.3 | | R51N | 51 | 33 | 800 | 630 | 8.0 | | T76N | 76 | 51 | 1600 | 1200 | 16.5 | | T76S | 76 | 45 | 1900 | 1500 | 19.7 | | FAQ | | --- | ## Description Threaded Hollow Bar/Self Drilling Anchor Bolt R51 for Micropile Foundation is part of our foundation & anchor bolts range (Anchors & Construction Fixings). ### Key details - **Type:** Rock Bolt - **Material:** Steel - **Surface Treatment:** Yes - **Application:** Construction - **Certification:** ISO - **Technics:** Hot Rolled Available configurations include surface treatment and material. Custom sizes, threads, materials, grades, platings and packaging can be quoted on request. ### Ordering through Engineering Hardware & Fasteners Minimum order is 2,000 meters at US$3.60 – 24.00 per meter. 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 Threaded Hollow Bar/Self Drilling Anchor Bolt R51 for Micropile Foundation? The listed minimum order is 2,000 meters, at US$3.60 – 24.00 per meter. 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 Threaded Hollow Bar/Self Drilling Anchor Bolt R51 for Micropile Foundation? Type: Rock Bolt; Material: Steel; Surface Treatment: Yes; Application: Construction; Certification: ISO; Technics: Hot Rolled. The full specification table and any technical parameter tables are listed on this page. ### Can this product be customized (OEM)? Listed configurations include surface treatment and material. 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 foundation & anchor bolts are available? The Foundation & Anchor Bolts category lists 2,223 products in different sizes, materials and finishes: [https://engineeringhardware.com/fastener-products/anchors-construction-fixings/foundation-anchor-bolts/](https://engineeringhardware.com/fastener-products/anchors-construction-fixings/foundation-anchor-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 Foundation & Anchor Bolts →](https://engineeringhardware.com/fastener-products/anchors-construction-fixings/foundation-anchor-bolts/) [![Reliable Anchor Bolt for Masonry Fixings with Expansion Design](https://img.engineeringhardware.com/Reliable-Anchor-Bolt-for-Masonry-Fixings-with-Expansion-Design.webp)](https://engineeringhardware.com/product/reliable-anchor-bolt-for-masonry-fixings-with-expansion-design/) Foundation & Anchor Bolts ### [Reliable Anchor Bolt for Masonry Fixings with Expansion Design](https://engineeringhardware.com/product/reliable-anchor-bolt-for-masonry-fixings-with-expansion-design/) Anchor Bolt · DIN, ANSI, GB **US$0.91 – 5,914**MOQ 2,000 pieces [![Heavy-Duty Hot Galvanized Steel Claw Anchor Bolts for 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