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Bolts › Countersunk, Plow & Elevator Bolts

Steel Grade 8.8 Flat Head Socket Cap Screw Countersunk Bolts Black Oxidation Made in China

Updated 2026-11-03 · Markdown version

US$0.024 / piece

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

Material: Carbon Steel
Head Style: Socket
Standard: DIN, ANSI, GB, JIS, BSW, GOST
Grade: 8.8
Finish: Black
Customized: Support (Size/Grade/Surface/Head/Driver etc.)
Package Size: 26.00cm * 26.00cm * 10.00cm

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	Carbon Steel
Type	Countersunk Head
Connection	Common Bolt
Head Style	Socket
Standard	DIN, ANSI, GB, JIS, BSW, GOST
Grade	8.8
Application	Machinery, Chemical Industry, Environmental, Building
Finish	Black
Service	Customized
Customized	Support (Size/Grade/Surface/Head/Driver etc.)
OEM ODM	Yes
Transport Package	26 * 26 * 10 Cartons in Bulk
Specification	M3~M100
Origin	Made in China
HS Code	7315189001
Production Capacity	220mpieces/Year
Package Size	26.00cm * 26.00cm * 10.00cm
Package Gross Weight	21.000kg
Carton Box	Put into small boxes, then into the carton. The size of the small box can be customized.
Category	Countersunk, Plow & Elevator Bolts

Technical parameters

Product name	Socket countersunk head screws
Material	carbon steel, alloy steel, stainless steel, brass, aluminum, etc.
Specifications	M5 X 10 or Customized
Surface Treatment	Plain, Polished, Black, Phosphating and Blackening,Zinc Plated (white/blue/yellow),Nickel Plated, Chrome Plated, Dacromet,HDG (hot dip galvanizing),Greencate (powder zincification / sherardizing)
Technology	Cold forging, Hot forming, Machining, Heat treatment, Staming, etc
Grade	4.8, 6.8, 8.8, 10.9, 12.9 / A2-50, A2-70, A4-70, A4-80HV100-140, HV150-200, HV200-300
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

Steel Grade 8.8 Flat Head Socket Cap Screw Countersunk Bolts Black Oxidation Made in China is part of our countersunk, plow & elevator bolts range (Bolts).

Key details

Type: Countersunk Head
Standard: DIN, ANSI, GB, JIS, BSW, GOST
Material: Carbon Steel
Grade: 8.8
Head Style: Socket
Finish: Black
Connection: Common Bolt
Application: Machinery, Chemical Industry, Environmental, Building

Available configurations include material, head style, standard, grade and finish. 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 Steel Grade 8.8 Flat Head Socket Cap Screw Countersunk Bolts Black Oxidation Made in China?

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 Steel Grade 8.8 Flat Head Socket Cap Screw Countersunk Bolts Black Oxidation Made in China?

Type: Countersunk Head; Standard: DIN, ANSI, GB, JIS, BSW, GOST; Material: Carbon Steel; Grade: 8.8; Head Style: Socket; Finish: Black. 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 finish. 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, plow & elevator bolts are available?

The Countersunk, Plow & Elevator Bolts category lists 533 products in different sizes, materials and finishes: https://engineeringhardware.com/fastener-products/bolts/countersunk-plow-elevator-bolts/

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$0.024MOQ 10,000 piecesGet a quote WA