What is the difference between DIN6921 and DIN6922?

DIN6921 is a hex flange bolt with a smooth flange face, while DIN6922 is a hex flange bolt with serrated teeth on the flange face for enhanced anti-loosening performance.

High Strength Hex Flange Bolt Grade 8.8 with Serrated Head

Name: High Strength Hex Flange Bolt Grade 8.8 with Serrated Head
Brand: Hebei Bolaige New Material Technology Co., Limited
SKU: 2193269172

Hebei, ChinaHebei Bolaige New Material Technology Co., Limited

US$0.03

1,000-9,999 Pieces

US$0.01

10,000+ Pieces

Sample price:US$1.00/piece.Request sample

Product profile

Customization

Available

Material

Carbon Steel

Type

Hexagon Head

Model NO.

M4-M64

Connection

Common Bolt

Head Style

Hexagonal

Standard

DIN, ANSI, GB, GOST, ASTM

Grade

4.8

Application

Machinery, Chemical Industry, Environmental, Building, Electric Power Fittings

Finish

Black

Surface Treatment

Black/HDG/......

Payment

T/T

MOQ

1000

Size

as Required

Transport Package

as Required

Specification

M6-M72

Trademark

Origin

China

Key features

The flange and bolt head are integrated, eliminating the need for additional washers during installation. The flange acts as a built-in washer, distributing the load across a wider area and providing

Manufactured from Q235B, Q345B, 35#, 45#, 40Cr and other high-quality carbon or alloy steels, providing excellent strength and toughness

Offers 4.8, 6.8, 8.8, 10.9 and 12.9 property grades. Grade 8.8 and above are quenched and tempered for higher load capacity

Zinc coating thickness 45 - 85 or above, far exceeding electro-galvanizing (5-15 ), providing excellent corrosion resistance for long-term outdoor use

Diameters from M6 to M72, lengths from 20 mm to 1000 mm, customizable to meet all transmission tower foundation requirements

Manufactured in accordance with DIN6921, DIN6922, GB/T, ISO 4162 and ASME B18.2.1 standards, compatible with electric power fitting industry specifications

Threads are roll-formed for high precision and strength, used with matching nuts and washers for secure and reliable connections

The flange increases the contact area, effectively distributing preload. Some models feature anti-slip serrations for vibration resistance and anti-loosening, suitable for power towers under long-term

Company profile

Experienced TeamPatents AwardedRaw-Materials TraceabilityManagement Certification

Hebei Bolaige New Material Technology Co., Limited

Hebei, China

Business Type: Manufacturer/FactoryExport Year: 2017-02-09Nearest Port: tianjin, qingdaoAverage Response Time: >24hTerms of Payment: LC, T/T, D/PInternational Commercial Terms(Incoterms): FOB, EXW, CFR, CIF

About Our Factory & Business Background

AddressHandan, Hebei, China

Average Lead TimePeak Season Lead Time: one month Off Season Lead Time: within 15 workdays

Our Production Capability & Technical Expertise

Main ProductsElectric Power Fittings, B7 Stud Bolts, Bolts Hex Bolts, Nuts Hex Nuts, Anchor Bolts, Washer, Thread Rod, Allen Bolts, Carriage Bolts, Wedge Anchor

Our Industry Experience & Global Business Record

Main MarketsSoutheast Asia, Africa, Mid East, Eastern Asia

Product Q&A

Q:What is a flange bolt used for in power lines?

Flange bolts are used to secure structural connections on transmission towers, substations and pole lines. The integrated flange design eliminates the need for separate washers, providing a larger load-bearing area and more uniform clamping force.

Q:What material and grades are available?

We offer 4.8, 6.8, 8.8, 10.9 and 12.9 property grades. Materials include Q235B, 35K, 45K, 40Cr, 35CrMo and 42CrMo. Grade 8.8 and above are quenched and tempered.

Q:What is the difference between a flange bolt and a regular hex bolt?

A flange bolt has an integrated flange (a ridge) at the base of the head, which acts as a built-in washer. This distributes the load across a wider area and eliminates the need for additional washers during installation.

Q:What surface treatment is applied?

Standard finish is hot-dip galvanized with zinc coating 45-85 . Other options include electro-galvanizing, Dacromet, black oxide and phosphating.

Q:What sizes are available?

Standard sizes range from M6 to M72, with lengths from 30 mm to 500 mm. Custom sizes from M4 to M72 are also available.