Standard & made-to-drawing parts
Checked before shipping
Air, sea & express delivery

Anchors & Construction Fixings › Foundation & Anchor Bolts

Threaded Hollow Bar/Self Drilling Anchor Bolt R51 for Micropile Foundation

Updated 2026-11-03 · Markdown version

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

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

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/

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

More about us → · Request a sample or custom quote →

Request a quote for this product

US$3.60 – 24.00MOQ 2,000 metersGet a quote WA