Phosphor Bronze Hex Head Bolt Fastener

Materials: Silicon bronze, phosphor bronze, aluminum bronze, copper materials are available
Standard: ASME, DIN, GB, BS, etc. Special sizes can be customized
Basic packaging: plastic bag + neutral carton (without logo) + solid wood palle

Hex Head Bolt are hexagon head bolts (partial thread) and hexagon head bolts (full thread).
Hex Head Bolt: A type of fastener consisting of a head and a screw (a cylinder with external threads), which must be used with a nut to fasten two parts with through holes.
This type of connection is called a bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection.

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Product Description

Length ——————— Model	10mm- 30mm	30mm- 50mm	50mm- 80mm	80mm- 100mm	100mm- 150mm
1/4-20	●	●	●
5/16-18	●	●	●
3/8-16	●	●	●	●	●
1/2-13	●	●	●	●	●
9/16-12	●	●	●	●	●
5/8-11	●	●	●	●	●
3/4-10	●	●	●	●	●
M3-0.5	●	●
M4-0.7	●	●	●	●	●
M5-0.8	●	●	●
M6-1.0	●	●	●
M8-1.25	●	●	●	●
M10-1.5	●	●	●	●
M12-1.75	●	●	●	●
M16-2.0	●	●	●	●	●
M20-2.5	●	●	●	●	●

Product Overview

Our Phosphor Bronze Flat Washer M8 Industrial is a precision-engineered component designed to optimize load distribution and prevent surface damage in critical machinery assemblies. Manufactured from high-quality phosphor bronze through precision stamping and deburring processes, this M8 washer provides a unique combination of superior corrosion resistance, electrical conductivity, and conformability—making it ideal for industrial applications where both mechanical performance and electrical continuity are essential .

Product Specifications

Parameter	Value
Material	Phosphor Bronze (Cu-Sn-P alloy with 5% tin content for strength)
Size	M8 (compatible with M8 bolts, studs, and screws)
Inner Diameter	8.2mm (with 0.5mm chamfer to prevent thread damage during installation)
Outer Diameter	16mm (optimized for load distribution over 3x the bolt diameter)
Thickness	1.6mm (standard industrial grade for M8 fasteners)
Hardness	HV120 - 150 (balanced for strength and conformability)
Surface Finish	Smooth (Ra ≤ 1.6μm) with fully deburred edges to prevent cuts

Features

• Precision dimensions (±0.05mm tolerance on critical surfaces) ensure proper fit with M8 fasteners, eliminating looseness in assemblies

• Electrical conductivity (15% IACS) enables effective grounding in electrical enclosures, reducing electrostatic discharge risks

• Corrosion resistance in damp and industrial environments, outperforming carbon steel washers by 500% in humidity testing

• Controlled ductility allows conforming to surface irregularities while maintaining structural integrity, preventing leaks in fluid systems

• Non-magnetic properties eliminate electromagnetic interference in sensitive equipment like medical devices and sensors

Applications

Essential for electrical junction boxes, automotive electronic control units (ECUs), marine hardware fittings, and precision machining centers. Used in conjunction with hex bolts, studs, and socket screws to protect painted or machined surfaces, distribute clamping force, and ensure electrical continuity in grounded systems .