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Screws › Countersunk & Flat-Head Machine Screws

Stainless Steel DIN7991 SS304 M3 – M56 Half Thread Hexagon Socket Countersunk Head Machine Screw

Updated 2026-11-04 · Markdown version

US$0.024 / piece

MOQ 10,000 pieces · Final price confirmed in your quote

Head Style: Counter Sunk Bolt
Standard: DIN, GB, ANSI, BSW, JIS, GOST
Grade: A2-70
Customized: Support (Size/Grade/Surface/Head/Driver etc.)
Package Size: 26.00cm * 26.00cm * 10.00cm
Material: Stainless Steel

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

Groove	Socket
Connection	Common Bolt
Head Style	Counter Sunk Bolt
Standard	DIN, GB, ANSI, BSW, JIS, GOST
Grade	A2-70
Service	Customized
Customized	Support (Size/Grade/Surface/Head/Driver etc.)
OEM ODM	Support
Transport Package	26 * 26 * 10 Cartons in Bulk
Specification	M6X100 or Customized
Origin	Made in China
HS Code	7315189001
Production Capacity	220mpieces/Year
Package Size	26.00cm * 26.00cm * 10.00cm
Package Gross Weight	21.000kg
Customization	Available
Material	Stainless Steel
Type	Countersunk Head
Shipping Cost	Contact the supplier about freight and estimated delivery time.
Carton Box	Put into small boxes, then into the carton. The size of the small box can be customized.
Category	Countersunk & Flat-Head Machine Screws

Technical parameters

Product name	Flat Countersunk head Hex Socket Allen Key Pointed Tail Machine Screw
Material	Stainless Steel, etc.
Specifications	M6 X 100 or Customized
Surface Treatment	Plain, Polished
Technology	Cold forging, Hot forming, Machining, Heat treatment, Staming, etc
Grade	A2-50, A2-70
Executive Standard	DIN, ANSI/ASTM, IFI, BS, GB, ISO, JIS, BA, etc. / Customized
Package	Carton bulk, Carton box, Pallet, etc.
Estimated delivery time	Negotiation required
logistics mode	Cusomized
LOGO customization	support
Outer packaging customization	support

d
Screw Thread	M3	M4	M5	M6	M8	M10	M12	(M14)	M16	M20
P	Pitch		0.5	0.7	0.8	1	1.25	1.5	1.75	2	2	2.5
b	ref.		18	20	22	24	28	32	36	40	44	52
dk	theor.	max	6.72	8.96	11.2	13.44	17.92	22.4	26.88	30.8	33.6	40.32
actual	min	5.54	7.53	9.43	11.34	15.24	19.22	23.12	26.52	29.01	36.05
ds	max		3	4	5	6	8	10	12	14	16	20
min		2.86	3.82	4.82	5.82	7.78	9.78	11.73	13.73	15.73	19.67
e	min		2.3	2.87	3.44	4.58	5.72	6.86	9.15	11.43	11.43	13.72
k	max		1.86	2.48	3.1	3.72	4.96	6.2	7.44	8.4	8.8	10.16
s	Nominal Size		2	2.5	3	4	5	6	8	10	10	12
max	12.9	2.045	2.56	3.071	4.084	5.084	6.095	8.115	10.115	10.115	12.142
Other property class	2.06	2.58	3.08	4.095	5.14	6.14	8.175	10.175	10.175	12.212
min		2.02	2.52	3.02	4.02	5.02	6.02	8.025	10.025	10.025	12.032
t	min		1.1	1.5	1.9	2.2	3	3.6	4.3	4.5	4.8	5.6
Minimum tensile load(N)-8.8		3220	5620	9080	12900	23400	37100	53900	73600	100000	162000
Minimum tensile load(N)-10.9		4180	7300	11800	16700	30500	48200	70200	96000	130000	204000
Minimum tensile load(N)-12.9		4910	8560	13800	19600	35700	56600	82400	112000	154000	239000
,emin=1.14smin
,80% of the values specified in ISO 898-1

Description

Stainless Steel DIN7991 SS304 M3 – M56 Half Thread Hexagon Socket Countersunk Head Machine Screw is part of our countersunk & flat-head machine screws range (Screws).

Key details

Type: Countersunk Head
Standard: DIN, GB, ANSI, BSW, JIS, GOST
Material: Stainless Steel
Grade: A2-70
Head Style: Counter Sunk Bolt
Groove: Socket
Connection: Common Bolt
Service: Customized

Available configurations include head style, standard, grade, customized and package size. Custom sizes, threads, materials, grades, platings and packaging can be quoted on request.

Ordering through Engineering Hardware & Fasteners

Minimum order is 10,000 pieces at US$0.024 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 Stainless Steel DIN7991 SS304 M3 – M56 Half Thread Hexagon Socket Countersunk Head Machine Screw?

The listed minimum order is 10,000 pieces, at US$0.024 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 Stainless Steel DIN7991 SS304 M3 – M56 Half Thread Hexagon Socket Countersunk Head Machine Screw?

Type: Countersunk Head; Standard: DIN, GB, ANSI, BSW, JIS, GOST; Material: Stainless Steel; Grade: A2-70; Head Style: Counter Sunk Bolt; Groove: Socket. The full specification table and any technical parameter tables are listed on this page.

Can this product be customized (OEM)?

Listed configurations include head style, standard, grade, customized and package size. 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 →

Request a quote for this product

US$0.024MOQ 10,000 piecesGet a quote WA