Raised Countersunk Head Slot Brass Wood Screw

Surface treatments are mostly used on carbon steel screws, since carbon steel easily gets rusty. Stainless steel and brass screws barely need extra finishing, as they already have good corrosion resistance.

1.Black Oxide

It forms a black iron oxide layer on Raised Countersunk Head Slot Brass Wood Screw surfaces via chemical reaction.Salt spray test result: 24 to 48 hours.Best used indoors in dry places like furniture and wooden crafts.It costs the least and matches dark wood well. But rust protection is weak, not fit for damp areas, and needs oiling again after the oil layer fades away.

2.Phosphating

It creates dark grey or black phosphate film on the surface.Salt spray test result: 48 to 72 hours.Works indoors, better anti-rust effect than black oxide, also good for parts needing lubrication.It holds oil well with fair price, yet still not for long time outdoor use.

3.Zinc Plating

Metal zinc is coated on Raised Countersunk Head Slot Brass Wood Screw by electroplating, including white zinc, blue white zinc and yellow zinc.Blue white zinc: 48-96 hours salt spray time; yellow zinc: 100-200 hours.Suitable for slightly humid indoor places.Nice look with steady anti-rust effect and proper cost. It may cause hydrogen embrittlement on high strength carbon steel, but this barely affects common wood screws.

4.Mechanical Zinc Plating

Zinc powder sticks to Raised Countersunk Head Slot Brass Wood Screw surface by physical impact instead of liquid medicine. It looks silver grey and less bright than electroplating.Salt spray resistance: 96 to 200 hours.Ideal for places needing strong rust protection and no hydrogen embrittlement risk.Safe for strict use cases, while its surface look is plain and price is a bit higher.

5.Dacromet

Coat Raised Countersunk Head Slot Brass Wood Screw with mixed zinc and aluminum powder then heat to fix the layer. It is dull silver grey.Salt spray performance can reach over 1000 hours.Perfect for outdoor, wet and heavily corrosive working conditions.Great anti-rust effect, no hydrogen embrittlement and heat resistant. The downside is higher cost and thicker coating.

6.Hot-dip Galvanizing

Screws are soaked in melted zinc liquid to get a thick zinc outer layer, with dull grey rough surface.It has top-level rust resistance, salt spray test can last hundreds to thousands hours.Mainly used for outdoor large wood structures, railings and power equipment.The zinc layer is thick and wear-resistant. This treatment is seldom used on regular wood screws.

Mon	2.5	3	3.5	4	4.5	5	5.5	6	7	8	10
P	1	1.2	1.4	1.6	1.8	2	2.2	2.5	2.8	3	3.5
ds min	2.25	2.75	3.2	3.7	4.2	4.7	5.2	5.7	6.64	7.64	9.64
ds max	2.5	3	3.5	4	4.5	5	5.5	6	7	8	10
dk max	5	6	7	8	9	10	11	12	14	16	20
dk min	4.7	5.7	6.64	7.64	8.64	9.64	10.57	11.57	13.57	15.57	19.48
k max	1.4	1.7	2	2.2	2.7	3	3.2	3.5	4	4.5	5.8
n min	0.6	0.8	0.9	1	1.2	1.2	1.4	1.6	18	2	2.5
n max	0.85	1.05	1.15	1.35	1.55	1.55	1.75	1.95	2.15	2.35	2.85
t max	0.96	1.11	1.35	1.45	1.7	1.94	2.04	2.19	2.55	2.8	3.5
t min	0.64	0.79	0.95	1.05	1.3	1.46	1.56	1.71	1.95	2.2	2.9

Application value and long-term savings

The Raised Countersunk Head Slot Brass Wood Screw are a product that combines "good appearance with durability". Their price advantage is not only reflected in the purchase quantity, but also in the hidden benefits brought about by reducing post-installation maintenance and enhancing the appearance of the finished product.

1.Decorative performance

The golden yellow color of the brass screws can be used in high-end furniture, wooden doors, antique decoration, and yacht interiors, which can directly enhance the quality of the products. Customers are willing to pay more for such details.

2.Reduce maintenance and save manpower.

Once a screw gets rusty, the cost of replacing it is much higher than the price of the screw itself.

Bronze does not develop red rust in a humid environment. Even if the surface oxidizes and becomes darker, it is merely a uniform layer of oxide film, which does not affect the strength or appearance.

3.raised countersunk

The raised countersunk head is slightly raised, which is not only more aesthetically pleasing than the round head, but also easier to install than the full countersunk head. No precise countersink is required. The installation process is quicker, and thus it saves money.

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