WASHER HEAD BOLTS

Washer head bolts are used when the head of the bolt sits flush to a wooden member. The forged washer side provides a larger bearing surface so that when the bolt is tightened, the wood underneath the head is not damaged. Washer head bolts have an added semi-cone point and a thread length unique to pole line fasteners depending on the length of the bolt. Washer head bolts normally have a square nut assembled, but can also have a hex nut assembled.

Roll-fast is the biggest manufacturer for larger diameter Washer head bolts & nuts in India, we have a monthly production of over 300 tons in bigger sizes from M-16 to M-80 according to grade 8.8, 10.9, A307A. We are the pioneers in manufacturing critical fasteners 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.

• ISO 898-1 - 8.8, 10.9 & 12.9
• A307A - 307A, 307B, 307C.
• ASTM A320 - A2, A4, SS 304, SS316, SS316S31 etc.

Dimension

• GB 5789
• As per Customer requirements.

Bolts characteristics

Finish

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.