Standard & made-to-drawing parts
Checked before shipping
Air, sea & express delivery

Grade 12.9 Black High-Strength Cylindrical Head Hex Socket Bolts / Hex Socket Cap Screws (M2~M10)

Updated 2026-11-04 · Markdown version

Model no. Screws (M2~M10)

US$0.12 – 0.72 / piece

MOQ 500 pieces · Final price confirmed in your quote

Material: Carbon Steel
Head Style: Round
Standard: GB
Grade: 12.9
Surface Treatment: Nickel Plating
Strength Grade: Grade 12.9
Head Shape: Round Head
Package Size: 50.00cm * 30.00cm * 20.00cm

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	Round Head
Model NO.	Screws (M2~M10)
Groove	Cross
Connection	Common Bolt
Head Style	Round
Standard	GB
Grade	12.9
Surface Treatment	Nickel Plating
Application	Construction Industry, Rail Transit Equipment Manu
Strength Grade	Grade 12.9
Head Shape	Round Head
Transport Package	Plastic Bag + Paper Box
Specification	M1.6-M16
Origin	China
HS Code	8405100000
Production Capacity	100000pieces/Year
Package Size	50.00cm * 30.00cm * 20.00cm
Package Gross Weight	10.000kg
Specification Composition	Thread Diameter * Length (DL), for example: M4*20
Thread diameter	4D, Thread length: 20MDI
Unit	mm (millimeters)
Category	Structural & Heavy Hex Bolts

Technical parameters

Name	Grade 12.9 Hex Socket Head Cap Screw	Specifications	M1.6-M16	Standards	GB
Standards	DIN912	Materials	Plain Carbon Steel	Application	Architecture, Rail Transit, and Related Fields
Surface Treatment	Black Plating	Strength Grade	Grade 12.9	Head Type	Socket Cap Head

Name	Grade 12.9 Hex Socket Head Cap Screw	Surface Treatment	Black Oxide	Product Specifications	M1.6-M16
Standards	National Standard	Packaging Instructions	Plastic Bag + Paper Box	Material	Alloy Steel

For orders with especially high tolerance requirements, please proceed with caution. The thread specification d*L follows the reference naming convention, and the length does not include the head length. Unit: mm (millimeters)
Nominal Diameter (d)	Pitch (P)	Head Diameter (dk)	Head Thickness (k)	Hexagon Socket Width (S)	Slot Depth (t)
M1.4	0.3	2.74	2.46	1.4	1.26	1.36	1.32	0.6
M1.6	0.35	3.14	2.86	1.6	1.46	1.56	1.52	0.7
M2	0.4	3.98	3.62	2	1.86	1.56	1.52	1
M2.5	0.45	4.68	4.32	2.5	2.36	2.06	2.02	1.1
M3	0.5	5.68	5.32	3	2.86	2.58	2.52	1.3
M4	0.7	7.22	6.78	4	3.82	3.08	3.02	2
M5	0.8	8.72	8.28	5	4.82	4.095	4.02	2.5
M6	1	10.22	9.78	6	5.7	5.14	5.02	3
M8	1.25	13.27	12.73	8	7.64	6.14	6.02	4
M10	1.5	16.27	15.73	10	9.64	8.175	8.025	5
M12	1.75	18.27	17.73	12	11.57	10.18	10.025	6
M14	2	21.33	20.67	14	12.57	12.21	12.032	7
M16	2	24.33	23.67	16	15.57	14.21	14.032	8
M18	2.5	27.33	26.67	18	17.57	14.21	14.032	9
M20	2.5	30.33	19.67	20	19.48	17.23	17.05	10

Cup Head Hex Socket Screw and Metric Hex Wrench Compatibility Chart
Screw Specification	M1.4	M1.6	M2	M2.5	M3	M4	M5	M6	M8	M10	M12
Compatible Hex Wrench	1.27mm	1.5mm	2mm	2.5mm	3mm	4mm	5mm	6mm	8mm	10mm

Description

Grade 12.9 Black High-Strength Cylindrical Head Hex Socket Bolts / Hex Socket Cap Screws (M2~M10) is part of our structural & heavy hex bolts range (Bolts).

Key details

Type: Round Head
Standard: GB
Material: Carbon Steel
Grade: 12.9
Strength Grade: Grade 12.9
Head Style: Round
Groove: Cross
Surface Treatment: Nickel Plating

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

Ordering through Engineering Hardware & Fasteners

Minimum order is 500 pieces at US$0.12 – 0.72 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 Grade 12.9 Black High-Strength Cylindrical Head Hex Socket Bolts / Hex Socket Cap Screws (M2~M10)?

The listed minimum order is 500 pieces, at US$0.12 – 0.72 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 Grade 12.9 Black High-Strength Cylindrical Head Hex Socket Bolts / Hex Socket Cap Screws (M2~M10)?

Type: Round Head; Standard: GB; Material: Carbon Steel; Grade: 12.9; Strength Grade: Grade 12.9; Head Style: Round. 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 surface treatment. 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 structural & heavy hex bolts are available?

The Structural & Heavy Hex Bolts category lists 2,565 products in different sizes, materials and finishes: https://engineeringhardware.com/fastener-products/bolts/structural-heavy-hex-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 →

Request a quote for this product

US$0.12 – 0.72MOQ 500 piecesGet a quote WA