Silicon Bronze Countersunk Bolts for Industrial

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

Countersunk screws are also called countersunk screws, also known as flat machine screws, and are a type of construction part. The head is a 90-degree cone, similar to common wood screws, with tool tightening grooves on the head, including flat, cross, hexagonal, plum blossom, pentagonal, etc.
Screws are used to connect two objects. Generally, the head of the screw protrudes above the surface of the connected object, making the surface unflat. Countersunk screws can sink under the surface to make the surface flat. Harder objects need to drill countersunk holes at the corresponding position of the countersunk head. In short, the countersunk head means that the head of the screw can keep the surface flat after installation.
Screws play the role of connecting two or more objects and are indispensable necessities in daily life or industrial manufacturing. There are countersunk bolts (with grooves) and countersunk bolts (with tenons).

Availability:

Quantity:



Inquire Add to Basket

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 Silicon Bronze Countersunk Bolts for Industrial are precision fasteners designed for flush mounting in harsh industrial environments. Made from premium silicon bronze alloy (Cu-Si-Mn) with strict quality certification, their 82° countersink head eliminates protrusions, ensuring safety and corrosion resistance in critical applications .

Product Specifications

Parameter	Value
Material	Silicon Bronze Alloy (Cu ≥92%, Si 2-4%, Mn 1-2%)
Size Range	M5 - M20 (metric coarse threads, 0.8mm-2.5mm pitch)
Head Style	Countersunk (82° angle for flush mounting)
Tensile Strength	600 - 700 MPa (ASTM E8 tested)
Hardness	130 - 170 HB (2.5mm ball, 62.5kg load)
Thread Type	Metric (6g tolerance)
Surface Finish	Natural bronze (chromate passivated)
Drive Type	Phillips, slotted, hex socket (custom options)

Features

Flush-mounting design reduces snagging risks (OSHA compliant)

6000+ hours salt spray resistance (ASTM B117), outperforming carbon steel by 500%

Excellent machinability with minimal tool wear

ATEX Zone 2/22 certified non-sparking properties

High thermal conductivity (55 W/m·K) for heat dissipation

Applications

Integrated into food processing equipment, marine deck machinery, industrial conveyors, and pharmaceutical systems. Essential for securing panels, guards, and covers requiring smooth surfaces .