timber bolts


Timber bolts are used in both wood and marine applications, and commonly referred to as dome head, fender head, safety head, and mushroom head bolts. The underside of the over-sized, rounded bolt head has nubs or fins which prevent the bolt from turning in the timber (usually between two and four nubs). The over-sized head of the timber bolt eliminates the need for a washer on the bolt head end, therefore reducing costs. Hot dipped galvanized timber bolts meet ASTM A-307 for strength and ASTM A-153 for the hot dipped galvanized finish. Stainless steel timber bolts are available in type 316 stainless steel.

Roll-fast is the biggest manufacturer for larger diameter Timber & nuts in India, we have a monthly production of over 300 tons in bigger sizes from M-16 to M-80 according to grade A307A, A449, A593. We are the pioneers in manufacturing critical fasteners for the Marine Application in India. These Fasteners are manufactured only by hot forging process and we have the complete list of machines in our factory to manufacture these bolts & nuts.

Bolt Grades

We offer Timber Bolts in 8.8, 10.9 & 12.9, SS 304, SS 304L, SS 309, SS 310, SS 316, SS 316L, SS 317, SS 317L, SS 321, SS 330, SS 347, SS 410, SS 430, SS 440C grade, the choice of the grade depends upon the application and requirement of the customer. The grades 8.8, 10.9 & 12.9 have separate mechanical characteristics which are defined in the ISO 898-1.

  • IS, DIN, BS, ASTM, IS 4190, ISO, JIS, GB


  • As per Customer requirements.

Bolts characteristics

  • Heavy-duty construction
  • Oversized low-profile head
  • Built-in rings provide water protection
  • Underside nubs prevent turning once installed


HDG, Zinc Plated, Zinc Flake, Black Oxide, Xylan, PTFE, Geomat, Chrome finish

We can offer surface finishing as per customer requirement in hot dip galvanizing, we take special care to ensure there is no hydrogen embrittlement in 10.9 grade with our special curing system which ensures that 10.9 grade bolts are not damaged by hydrogen embrittlement post galvanizing process. We also do zinc electroplated in blue, yellow, or black color as per customer requirements.