TYPE BD MANHOLE COVER

Nominal size	D1	D2	D3	S	Fastener		Weight
					D.	Qty
Φ450	Φ470	Φ530	Φ590	6	M20	18	30.3
				8			34.6
				10			38.9
				12			43.2
				14			47.5
Φ600	Φ620	Φ680	Φ740	10		22	56.0
				12			62.8
				14			69.5
				16			76.3
				18			83.0
				20			89.8
				22			96.5