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Screws › Countersunk & Flat-Head Machine Screws

Multipurpose Titanium Tc4 DIN7991 Hexagon Socket Countersunk Head Screws

Updated 2026-11-04 · Markdown version

Model no. DIN7991

US$0.70 / piece

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

Head Style: Counter Sunk Bolt
Standard: DIN, GB, ANSI, BSW, JIS, GOST
Grade: 10.9
Customize: Yes
Package Size: 26.00cm * 26.00cm * 10.00cm
Material: Titanium/Titanium Alloy

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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

Model NO.	DIN7991
Groove	Hexagon
Connection	Common Bolt
Head Style	Counter Sunk Bolt
Standard	DIN, GB, ANSI, BSW, JIS, GOST
Grade	10.9
Customize	Yes
OEM ODM	Yes
Transport Package	Carton and Pallet
Specification	M1.6-M10 or OEM
Origin	Shanghai
HS Code	7318150001
Production Capacity	5000000
Package Size	26.00cm * 26.00cm * 10.00cm
Package Gross Weight	3.000kg
Customization	Available
Material	Titanium/Titanium Alloy
Type	Countersunk Head
Shipping Cost	Contact the supplier about freight and estimated delivery time.
Category	Countersunk & Flat-Head Machine Screws

Technical parameters

Product Name	Machine Screw
Material	Titanium
Color	self-color, Anodized
Standard	DIN GB ISO JIS ANSI UNI
Finished	Plain, Anodized

d
Screw Thread	M3	M4	M5	M6	M8	M10	M12	(M14)	M16	(M18)	M20	(M22)	M24
P	Pitch	0.5	0.7	0.8	1	1.25	1.5	1.75	2	2	2.5	2.5	2.5	3
α	tol.(+2)	90°	90°	90°	90°	90°	90°	90°	90°	90°	90°	90°	60°	60°
b	L≤125mm	12	14	16	18	22	26	30	34	38	42	46	50	54
125<L ≤ 200	/	/	/	24	28	32	36	40	44	48	52	56	60
L>200	/	/	/	/	/	45	49	53	57	61	65	69	73
dk	max=nominal size	6	8	10	12	16	20	24	27	30	33	36	36	39
min	5.7	7.64	9.64	11.57	15.57	19.48	23.48	26.48	29.48	32.38	35.38	35.38	38.38
ds	max=nominal size	3	4	5	6	8	10	12	14	16	18	20	22	24
min	2.86	3.82	4.82	5.82	7.78	9.78	11.73	13.73	15.73	17.73	19.67	21.67	23.67
e	min	2.3	2.87	3.44	4.58	5.72	6.86	9.15	11.43	11.43	13.72	13.72	16	16
k	max	1.7	2.3	2.8	3.3	4.4	5.5	6.5	7	7.5	8	8.5	13.1	14
s	Nominal Size	2	2.5	3	4	5	6	8	10	10	12	12	14	14
min	2.02	2.52	3.02	4.02	5.02	6.02	8.025	10.025	10.025	12.032	12.032	14.032	14.032
max	2.1	2.6	3.1	4.12	5.14	6.14	8.175	10.175	10.175	12.212	12.212	14.212	14.212
t	max=nominal size	1.2	1.8	2.3	2.5	3.5	4.4	4.6	4.8	5.3	5.5	5.9	8.8	10.3
min	0.95	1.55	2.05	2.25	3.2	4.1	4.3	4.5	5	5.2	5.6	8.44	9.87
Weight of per 1000 steel products(≈kg)	-	-	-
Length of Thread b	-	-

Description

Multipurpose Titanium Tc4 DIN7991 Hexagon Socket Countersunk Head Screws is part of our countersunk & flat-head machine screws range (Screws).

Key details

Type: Countersunk Head
Standard: DIN, GB, ANSI, BSW, JIS, GOST
Material: Titanium/Titanium Alloy
Grade: 10.9
Head Style: Counter Sunk Bolt
Groove: Hexagon
Connection: Common Bolt
OEM ODM: Yes

Available configurations include head style, standard, grade, customize 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$0.70 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 Multipurpose Titanium Tc4 DIN7991 Hexagon Socket Countersunk Head Screws?

The listed minimum order is 10,000 pieces, at US$0.70 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 Multipurpose Titanium Tc4 DIN7991 Hexagon Socket Countersunk Head Screws?

Type: Countersunk Head; Standard: DIN, GB, ANSI, BSW, JIS, GOST; Material: Titanium/Titanium Alloy; Grade: 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 head style, standard, grade, customize 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

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US$0.70MOQ 10,000 piecesGet a quote WA