• Metric
• Inch

Product		Size	Property Class	Standard
System HR Structural Bolt		M12 to M36	8.8 / 10.9	BS EN 14399-3
System HR Pre-Load Nut		M12 to M36	8 / 10	BS EN 14399-3
Plain Chamfered Washer		M12 to M36	HV 300 to 370	BS EN 14399-6
System HV Structural Bolt		M12 to M36	10.9	BS EN 14399-4
System HV Pre-Load Nut		M12 to M36	10	BS EN 14399-4
Tension Control Structural Bolt		M12 to M30	10.9	BS EN 14399-10
Pre-Load Nut		M12 to M30	10	BS EN 14399-10 (h=d)
Non Pre-Load Structural Bolt		M12 to M36	4.6, 5.6, 6.8, 8.8, 10.9	BS EN 15048-1, 2
Non Pre-Load Structural Nut		M12 to M36	4, 5, 6, 8, 10, 12	BS EN 15048-1, 2
High - Strength Structural Bolt		M12 to M36	8.8	AS1252 - 1983 Dimensional AS1252 - 1996 Mechanical
Structural Nut		M12 to M36	8	AS1252 - 1983 Dimensional AS1252 - 1996 Mechanical
Structural Washer		M12 to M36	35-45 HRC	AS1252 - 1983 Dimensional AS1252 - 1996 Mechanical
Heavy Hex Structural Bolt		M16 to M36	10.9S	IS 3757
Heavy Hex Nut		M16 to M36	10S / 8S	IS 6623
Structural Washer		M16 to M36	35 - 45 HRC (Plain) 26 - 45 HRC min (HDG)	IS 6649

Product		Size	Tensile Strength	Standard
Heavy Hex Structural Bolt		1/2 to 1 1/4	120,000 psi (1/2 to 1 dia) 105,000 psi (1 1/8 to 1 1/2 dia)	ASTM A325
Heavy Hex Structural Bolt		1/2 to 1 1/4	150,000 - 173,000 psi	ASTM A490
Heavy Hex Nuts Grade DH		1/4 to 2	C24 - C38	ASTM A563
Heavy Hex Nut Grade 2H		1/4 to 2	24 - 35 HRC	ASTM A194 2H
Hardened Washer		1/4 to 1 3/8	38 - 45 HRC (Coated) 26-45 HRC (HDG)	ASTM F436
Tension Control Structural Bolt		5/8 to 1 1/8	120,000 psi (1/2 to 1 dia) 105,000 psi (1 1/8 to 1 1/2 dia)	ASTM F1852
Tension Control Structural Bolt		1/2 to 1 1/8	150,000 - 173,000 psi	ASTM F2280

Pratham Fasteners is a trusted Unbrako Dealer and Unbrako Distributor offering reliable Structural Assemblies for construction, infrastructure, engineering, fabrication, and industrial applications. Our range of Unbrako Structural Assemblies is suitable for projects requiring secure, durable, and dependable fastening connections. As an authorized Caparo Dealer and Caparo Distributor, we also provide genuine branded fastening solutions for demanding structural and industrial requirements.

Pratham Fasteners is also an authorized Caparo Dealer and Caparo Distributor, providing customers with dependable access to quality industrial fastening solutions across India. Whether you require Structural Assemblies, Unbrako Structural Assemblies, or other specialized fastening products, we support contractors, fabricators, OEMs, engineering companies, and infrastructure industries with genuine products, reliable supply, and professional service.