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Screws › Countersunk & Flat-Head Machine Screws

Surface Treatment Customized Metric Flat Countersunk Csk Head Machine Screw

Updated 2026-11-04 · Markdown version

Model no. UNF-12

US$0.096 – 0.14 / piece

MOQ 200 pieces · Final price confirmed in your quote

Material: Stainless Steel
Head Style: Round
Standard: DIN, GB, ANSI, BSW, JIS, GOST
Grade: 8.8
Surface Treatment: Zinc Plated, Ruspert, Dacromet, Customized

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Specifications are as listed for this product. Engineering Hardware & Fasteners confirms ratings, mating parts, compatibility, packing and lead time with you before you order.

Specifications

Customization	Available
Material	Stainless Steel
Type	Round Head
Model NO.	UNF-12
Groove	Phillips
Connection	Common Bolt
Head Style	Round
Standard	DIN, GB, ANSI, BSW, JIS, GOST
Grade	8.8
Surface Treatment	Zinc Plated, Ruspert, Dacromet, Customized
Delivery	Sea Freight, Air, Train, Express
Certification	ISO9001, BSCI
Sample	Yes
ODM/OEM	Accept
Transport Package	Carton Boxes + Pallets
Specification	M2~M8
Origin	China
HS Code	73181590
Production Capacity	700tons/Month
Category	Countersunk & Flat-Head Machine Screws

Technical parameters

Union Stainless Steel Flat Head Machine Screw

Name

Flat Head Machine Screw

Material

Stainless Steel

Size

M2~M8 or non-standard as request&design

Length

3MM~60MM or non-standard as request&design

Surface Treatment

Electrical Zinc Coating. Ruspert, Dacroment,etc,Customized

Quality

Sample Testing Or Third-party Inspection

Origin

Made in China

Lead Time

Based on quantity

Stainless Steel Chemical Composition
Grade	C ≤	Si ≤	Mn ≤	P ≤	S ≤	Ni	Cr	Mo	Other
201	0.15	1.00	5.5-7.5	0.060	0.03	3.5-5.5	16-18		N≤0.25
304	0.08	1.00	2.00	0.045	0.03	8.0-10.0	18-20
304L	0.03	1.00	2.00	0.045	0.03	8.0-12.0	18-20
321	0.08	1.00	2.00	0.045	0.03	8.0-13.0	17-19		Ti≤5*C%
316	0.08	1.00	2.00	0.045	0.03	10.0-14.0	16-18	2-3
316L	0.03	1.00	2.00	0.045	0.03	10.0-15.0	16-18	2-3
309S	0.08	1.00	2.00	0.045	0.03	12.0-15.0	22-24
410	0.15		1.00		0.03	-	11.5-13.5
420	0.26-0.4		1.00		0.03	-	12-14
430	0.12	0.75	1.00	0.040	0.03	-	16-18

Main Fastener Coating
Types	Application	Spray Test Hours	Characteristics
Zinc, Electroplated	All Metal	96Hours	Lower cost and bright surface
Hot Dip Galvanized	All Metal	96Hours	Low corrosion rate and resists mechanical damage.
Electro Nickel	All Metal	200Hours	Flexibility in plating volume and thickness
Mechanical Plating	Steel	1000Hours	Smooth finish with high anti-corrosion grade
Black Oxide	All Metal	3-5Hours	Cheap
Dacrotized	Steel	1000Hours	Pollution-free ceramic coating
Passivation	Stainless Steel	/	Dissolved iron contaminants
Wax	Stainless Steel & Plated Fasteners	Fair, used as a lubricate	Used for ease of assembly

Description

Surface Treatment Customized Metric Flat Countersunk Csk Head Machine Screw is part of our countersunk & flat-head machine screws range (Screws).

Key details

Type: Round Head
Standard: DIN, GB, ANSI, BSW, JIS, GOST
Material: Stainless Steel
Grade: 8.8
Head Style: Round
Groove: Phillips
Surface Treatment: Zinc Plated, Ruspert, Dacromet, Customized
Connection: Common Bolt

Available configurations include material, head style, standard, grade and surface treatment. Custom sizes, threads, materials, grades, platings and packaging can be quoted on request.

Ordering through Engineering Hardware & Fasteners

Minimum order is 200 pieces at US$0.096 – 0.14 per piece. Send one inquiry with the part number, quantity and destination, and Engineering Hardware & Fasteners confirms size, thread, material, grade, finish, price, lead time and shipping, checks the goods before dispatch and ships them to you.

Frequently asked questions

What is the minimum order quantity (MOQ) for Surface Treatment Customized Metric Flat Countersunk Csk Head Machine Screw?

The listed minimum order is 200 pieces, at US$0.096 – 0.14 per piece. Smaller trial quantities or samples can be requested in your inquiry; Engineering Hardware & Fasteners confirms what is possible for your size.

What are the main specifications of Surface Treatment Customized Metric Flat Countersunk Csk Head Machine Screw?

Type: Round Head; Standard: DIN, GB, ANSI, BSW, JIS, GOST; Material: Stainless Steel; Grade: 8.8; Head Style: Round; Groove: Phillips. The full specification table and any technical parameter tables are listed on this page.

Can this product be customized (OEM)?

Listed configurations include material, head style, standard, grade and surface treatment. Size, thread, length, material and grade, surface finish, head marking, packaging and labels can be quoted to your specification or drawing.

What is the lead time and how is it shipped?

Lead time depends on quantity and customization and is confirmed in your quote. Engineering Hardware & Fasteners checks the goods before dispatch and ships by express, air or sea; mixed orders can be consolidated in one shipment.

Which other countersunk & flat-head machine screws are available?

The Countersunk & Flat-Head Machine Screws category lists 2,424 products in different sizes, materials and finishes: https://engineeringhardware.com/fastener-products/screws/countersunk-flat-head-machine-screws/

How we work

Specified, checked and shipped by Engineering Hardware & Fasteners

Engineering Hardware & Fasteners supplies bolts, screws, nuts, washers, anchors, rivets and fastening hardware to equipment makers, contractors, distributors and maintenance teams. Orders go through one controlled process: size, thread, material, grade and finish confirmed, samples approved, dimensions, thread fit and plating checked before packing, then packed for export — standard or made to drawing.

DIN, ISO, ASTM, ANSI, JIS and GB standard parts
Non-standard parts made to your drawing
Dimensions, thread gauges and plating checked before packing
Export cartons and pallets, consolidated mixed orders
Samples available for approval before mass production

More about us → · Request a sample or custom quote →

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US$0.096 – 0.14MOQ 200 piecesGet a quote WA