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Bolts › Countersunk, Plow & Elevator Bolts

Mild Carbon Steel Countersunk Bolts Left Hand Threads Socket Flat Head Screw M8X20mm

Updated 2026-11-03 · Markdown version

Model no. DIN7991, ISO10642, GB70

US$1.20100–999 pieces

US$0.121,000–9,999 pieces

US$0.01210,000+ pieces

MOQ 100 pieces · Final price confirmed in your quote

Material: Carbon Steel;Stainless Steel;Alloy Steel
Head Style: Counter Sunk Bolt
Standard: DIN
Grade: 4.8/5.6/8.8/10.9
Package Size: 10.00cm * 10.00cm * 10.00cm
Standard parts: 7-15days
Non-standard parts: 15-25days

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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	Carbon Steel;Stainless Steel;Alloy Steel
Type	Countersunk Head
Model NO.	DIN7991, ISO10642, GB70
Groove	Hexagon
Connection	Common Bolt
Head Style	Counter Sunk Bolt
Standard	DIN
Grade	4.8/5.6/8.8/10.9
Transport Package	Plastic Bag+ Carton+Wood Pallet
Specification	M4-M30/1/4"-8"
Origin	Shanghai, China
HS Code	73151900
Production Capacity	100 Tons/Month
Package Size	10.00cm * 10.00cm * 10.00cm
Package Gross Weight	1.000kg
All our processes strictly adhere to ISO9001	2008 procedures. We have strict quality control from producing to delivery.Our company had strong technology support, We have cultivated a group of managers who are familiar with product quality , good at modern concept of management.
Standard parts	7-15days
Non-standard parts	15-25days
Category	Countersunk, Plow & Elevator Bolts

Technical parameters

Product Name	Hex Socket Flat Countersunk Head Screw
Standard	GB/DIN/BS/ANSI
Grade	4.8/6.8/8.8/10.9/12.9
Material	Carbon Steel/SS304/Titanium
Surface Treatment	Plain,Black,Zinc,HDG,Dacromet,Nickel Plated
Packing detailes	Woven Bag,Carton,Pallets,or as your requests.
Payment Terms	T/T
Delivery Method	by sea,by air or by express service

M10

M12

(M14)

M16

M20

min
P	Pitch
b	ref.
dk	Theoretical	max
Actual	min
ds	max
e	min
k	max
s	Nominal Size
max
min
t	min
Minimum tensile load(N)-8.8
Minimum tensile load(N)-10.9
Minimum tensile load(N)-12.9

0.5	0.7	0.8	1	1.25	1.5	1.75	2	2	2.5
18	20	22	24	28	32	36	40	44	52
6.72	8.96	11.20	13.44	17.92	22.40	26.88	30.80	33.60	40.32
5.54	7.53	9.43	11.34	15.24	19.22	23.12	26.52	29.01	36.05
3	4	5	6	8	10	12	14	16	20
2.86	3.82	4.82	5.82	7.78	9.78	11.73	13.73	15.73	19.67
2.303	2.873	3.443	4.583	5.723	6.863	9.149	11.429	11.429	13.716
1.86	2.48	3.1	3.72	4.96	6.2	7.44	8.4	8.8	10.16
2	2.5	3	4	5	6	8	10	10	12
2.080	2.58	3.08	4.095	5.140	6.140	8.175	10.175	10.175	12.212
2.020	2.52	3.020	4.020	5.020	6.020	8.025	10.025	10.025	12.032
1.1	1.5	1.9	2.2	3	3.6	4.3	4.5	4.8	5.6
3220	5620	9080	12900	23400	37100	53900	73600	100000	162000
4180	7300	11800	16700	30500	48200	70200	96000	130000	204000
4910	8560	13800	19600	35700	56600	82400	112000	154000	239000

e mim=1.14 S min 80% of the values specified in ISO 898-1.

Description

Mild Carbon Steel Countersunk Bolts Left Hand Threads Socket Flat Head Screw M8X20mm is part of our countersunk, plow & elevator bolts range (Bolts).

Key details

Type: Countersunk Head
Standard: DIN
Material: Carbon Steel;Stainless Steel;Alloy Steel
Grade: 4.8/5.6/8.8/10.9
Head Style: Counter Sunk Bolt
Groove: Hexagon
Connection: Common Bolt
Standard parts: 7-15days

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

Ordering through Engineering Hardware & Fasteners

Minimum order is 100 pieces at US$0.012 – 1.20 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 Mild Carbon Steel Countersunk Bolts Left Hand Threads Socket Flat Head Screw M8X20mm?

The listed minimum order is 100 pieces, at US$0.012 – 1.20 per piece. Smaller trial quantities or samples can be requested in your inquiry; Engineering Hardware & Fasteners confirms what is possible for your size.

How does the price change with quantity?

Volume pricing: US$1.20 for 100–999 pieces; US$0.12 for 1,000–9,999 pieces; US$0.012 for 10,000+ pieces. Final prices depend on size, material, finish and packing and are confirmed in your quote.

What are the main specifications of Mild Carbon Steel Countersunk Bolts Left Hand Threads Socket Flat Head Screw M8X20mm?

Type: Countersunk Head; Standard: DIN; Material: Carbon Steel;Stainless Steel;Alloy Steel; Grade: 4.8/5.6/8.8/10.9; Head Style: Counter Sunk Bolt; Groove: Hexagon. 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 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, 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$0.012 – 1.20MOQ 100 piecesGet a quote WA