Foundation Bolts


Roll-Fast has been supplying foundation bolts for wind power industry for more than 10 years. With our state-of-the-art automated manufacturing, heat treating, coating and quality control systems.

We manufacture foundation bolts in grade 10.9 using high quality alloy and carbon steel material for wind tower assembly and many other uses in the wind energy sector, We also manufacture 8.8 & 12.9 grades as per customer needs. Our bolts and nuts are used heavily in the onshore and offshore areas of the wind energy sector in India, Europe, and USA. Foundation bolts are manufactured as per European and American standards in plain, Black and hot dip galvanised (HDG) finish, if required, we can also provide these bolts in special coatings like PTFE, Geomet and Dacromet finish.

We provide studs fitted with heat shrink and rigid plastic debonding sleeves, allowing uniform stressing of the anchor bolts after they have been cast into the concrete foundation.

What are Wind Turbine Foundation Bolts?

Foundation bolts manufactured and used in windmills are pre-engineered for wind turbine foundations and construction. Our Foundation Bolts are available in different grades & types including Full threaded & partial threaded. We manufacture M16 to M80 & 1/2” to 3” Foundation bolt as per customer requirements for wind turbines.

We also manufacture of Hex nuts in grade 10 & HV washer (HV200 & HV 300).

Commonly type of bolts used in wind towers




Grade name



Foundation bolts

ISO 965-1 / ASME B1.1

8.8, 10.9, 12.9

M-16 to M-80 / 1/2” to 3”


Foundation bolts

ISO 965-1 / ASME B1.1

B7, B7M, B8, L7, C1 & C2

M-16 to M-80 / 1/2” to 3”


Hex nut & Washer

ISO 965-1 / ASME B1.1

8, 10, 12, 2H, 7

M-16 to M-80 / 1/2” to 3”

In-house quality inspection for coatings and fasteners

All our critical processes, including hardening, hot-dip galvanising, and quality inspections are performed at our in-house facilities, to ensure the quality of our solutions for use in harsh environments.

All items are offered with EN10204 3.1 certifications featuring full traceability for the fasteners, also after installation.

Advantages of Using Roll Fast Bolts

  • Three active manufacturing plants in Delhi NCR allow for the most efficient Supply Chain Network and timely deliveries
  • Foundation bolts made by us have been cold temperature Impact tested to assure full load retention and reliability in harsh environments
  • Leading foundation bolt manufacturer in the industry with over 15 years’ experience
  • Custom anchor diameters and grades available upon customer request
  • Shipments are custom packaged per customer’s requirements
  • Foundation bolts come with unique marking for traceability
  • Foundation bolts can be chamfered to assist tower installation
  • Special A193 B7 150 KSI High Impact Steel available upon request