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DIN7991 Brass Hexagon Hex Socket Flat Countersunk Head Screw DIN 7991

Updated 2026-11-04 · Markdown version

Model no. DIN 7991

US$0.1210,000–49,999 pieces

US$0.0650,000–99,999 pieces

US$0.0024100,000+ pieces

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

Material: Brass
Head Style: Counter Sunk Bolt
Standard: DIN, GB, ANSI, BSW, JIS, ISO
Grade: 8.8
Thread: Unc, Unf, Un, Metric Coarse, Fine
Surface: Plain, Zinc Plated (Blue, White, Black, Yellow), N
Exterior Finish: Customized
Customized: Available

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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	Brass
Type	Countersunk Head
Model NO.	DIN 7991
Groove	Hexagon
Connection	Common Bolt
Head Style	Counter Sunk Bolt
Standard	DIN, GB, ANSI, BSW, JIS, ISO
Grade	8.8
Thread	Unc, Unf, Un, Metric Coarse, Fine
Surface	Plain, Zinc Plated (Blue, White, Black, Yellow), N
Quality	100% Tested
Price	Factory Price
Lead Time	15-30 Days
Package	Standard Package or Customer's Packing
Box	Customer's Brand Box/Plain Box
MOQ	Can Be Negotiated
Shipment	by Sea / Truck / Plane / Express
Exterior Finish	Customized
Sample	Available
Customized	Available
Service	One-Stop Service
Online Sales	24 Hours Online
OEM/ODM	Available
Transport Package	Bulk Packaging, Small Box(Glue Box, Color Box)
Specification	M3 - M24
Origin	Ningbo, China
HS Code	7318159001
Production Capacity	1000tons Per Month
Package Size	10.00cm * 10.00cm * 5.00cm
Package Gross Weight	0.500kg
Standards	GB, DIN, ISO, ANSI/ASTM, BS, BSW, JIS, ETC
Size	M3-M24 or non-standard asa request & design
Finish	Plain, Black, Zinc, Yellow Zinc, HDG, Dacromet, etc.
Category	Socket Head Cap & Allen Screws

Technical parameters

Hex Socket Countersunk Head Screw
Material:	Carbon Steel, Stainless Steel, Brass etc.
Standards:	GB, DIN, ISO, ANSI/ASTM, BS, BSW, JIS, ETC
Size:	M3-M24 or non-standard asa request & design
Finish:	Plain, Black, Zinc, Yellow Zinc, HDG, Dacromet, etc.

Screw Threadd	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≤125	12	14	16	18	22	26	30	34	38	42	46	50	54
125	/	/	/	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

A1: Our screws comply with DIN, ISO, ANSI, and JIS standards, and can also be customized according to customer drawings.

A2: We supply multiple grades including A2-70, A2-80, A4-70, A4-80, 304, 316, and 410SS, suitable for different mechanical strength and corrosion-resistance requirements.

A3: Yes, we offer free or low-cost samples for quality and dimension confirmation prior to order.

A4: Every batch is tested for torque, hardness, thread precision, and salt spray corrosion resistance, following ISO 9001 quality system standards.

A5: Yes. We can produce screws according to samples, technical drawings, or specific drive/head combinations, and offer custom packaging and labeling.

A6: A2 (304) is ideal for standard outdoor and industrial use, while A4 (316) contains molybdenum, offering higher corrosion resistance for marine, chemical, and salt-spray environments.

A7: Under severe chemical or chloride exposure, A2 may develop slight surface corrosion. A4/316 performs better in harsh environments. We also offer passivation treatment for enhanced protection.

Description

DIN7991 Brass Hexagon Hex Socket Flat Countersunk Head Screw DIN 7991 is part of our socket head cap & allen screws range (Screws).

Key details

Type: Countersunk Head
Standard: DIN, GB, ANSI, BSW, JIS, ISO
Material: Brass
Grade: 8.8
Size: M3-M24 or non-standard asa request & design
Thread: Unc, Unf, Un, Metric Coarse, Fine
Head Style: Counter Sunk Bolt
Groove: Hexagon

Available configurations include material, head style, standard, grade and thread. 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$0.0024 – 0.12 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 DIN7991 Brass Hexagon Hex Socket Flat Countersunk Head Screw DIN 7991?

The listed minimum order is 10,000 pieces, at US$0.0024 – 0.12 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$0.12 for 10,000–49,999 pieces; US$0.06 for 50,000–99,999 pieces; US$0.0024 for 100,000+ pieces. Final prices depend on size, material, finish and packing and are confirmed in your quote.

What are the main specifications of DIN7991 Brass Hexagon Hex Socket Flat Countersunk Head Screw DIN 7991?

Type: Countersunk Head; Standard: DIN, GB, ANSI, BSW, JIS, ISO; Material: Brass; Grade: 8.8; Size: M3-M24 or non-standard asa request & design; Thread: Unc, Unf, Un, Metric Coarse, Fine. 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 thread. 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 socket head cap & allen screws are available?

The Socket Head Cap & Allen Screws category lists 2,042 products in different sizes, materials and finishes: https://engineeringhardware.com/fastener-products/screws/socket-head-cap-allen-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$0.0024 – 0.12MOQ 10,000 piecesGet a quote WA