Hot Dip Galvanized Fasteners

Hot Dip Galvanized on Fasteners

Hot dip galvanizing is a strategy for covering a steel with metallic zinc to keep it from consuming. For starters the article to be hot plunged excited is gone through a synthetic clean to expel all rust, oil and surface scales. After the cleaning, the clearing arrangements is washed off the surface and the steel is taken further to coat.

The steel is then dunked into a shower of hot liquid zinc which has been warmed to a temperatur eof 460 Deg Celcius. The steel substrate is then expelled from the shower and permitted to cool in an extinguishing tank. At the point when the substrate is colled, the zinc covering is metallurgically clung to the steel. High malleable clasp like B7/2H, Grade 8.8, 10.9 & 12.9 Fasteners are regularly Hot Dipped Galvanized.


Galvanized Bolts

As a common procedure, nuts, screws and washers down to 8 mm distance across can be stirred and a wide scope of strung parts would now be able to be handled utilizing extraordinary gear. For ISO metric clasp, the arousing of one string either interior or outside requires an additional freedom of multiple times the covering thickness. By and by, it is typical for standard screws from stock to be completely excited, yet for nuts to be electrifies as spaces and after that tapped up to 0.4 mm oversize with the strings at that point softly oiled. Whenever collected, the nut string is ensured by contact with the covering on the screw. Indeed, even after numerous long stretches of administration, stirred nuts can promptly be detached despite the fact that the strings have never been aroused. Further subtleties of the measurements, preparing and execution of hot plunge stirred screws and nuts is given in 'The Engineers & Architects Guide to Hot Dip Galvanized

Ten Good Reasons For Hot Dip Galvanising

1 - Long life Arousing gives a simple to clean surface which can give an upkeep free existence of more than 50 years. (This is reliant on the earth it is being utilized in). At the point when upkeep in the end winds up essential, it is clear: no unpredictable readiness medications are necessary.

2 - Competitive first cost
For some applications the expense of hot plunge stirring is lower than that of applying elective coatings. The reason is basic: options - especially painting - are extremely work escalated contrasted and stirring which is an exceedingly automated, firmly controlled industrial facility process.

3 - Lowest lifetime cost
Low beginning expense and long life make arousing the most flexible and monetary method for ensuring steel for extensive stretches. There are rewards from no support or broadened upkeep interims: less issues of access in remote regions, troublesome landscape or when structures are firmly stuffed together; likewise when there are wellbeing confinements for example power pylons.

4 - Reliability
The procedure is generally basic, clear and firmly controlled. The thicknesses (loads) of coatings shaped are ordinary, unsurprising and basically determined. Hot plunge stirring is one of only a handful couple of coatings which is totally characterized by a British Standard (BS EN ISO 1461).

5 - Speed of application
A full assurance covering can be connected in hours; a muddled paint framework can require a week.

6 - Coating toughness
Stirring is one of a kind: the hot plunge process delivers a covering which is reinforced metallurgically to the steel. No other covering process has this component, and accordingly stirred steel has by a long shot the best protection from mechanical harm amid taking care of, capacity, transport and development - an imperative factor where steelwork is to be delivered around the world.

7 - Complete coverage
Since it is shaped by dunking steel in liquid zinc, all pieces of the outside of the steel are covered - inside, outside, cumbersome corners, and restricted holes which would be difficult to ensure in some other way. The covering really will in general develop at crucial corners and edges - instead of dispersing as do brushed, showered and other plunged coatings.

8 - Three-way protection
Galvanized coatings secure steel in three ways:

  • Firstly, the covering climates at a moderate rate giving a long and unsurprising life.
  • Secondly, the covering erodes specially to give cathodic (conciliatory) security to any little territories of steel uncovered through penetrating, cutting or unplanned harm; scratches are fixed by enduring items from the zinc.
  • Thirdly, if the harmed region is bigger, the conciliatory assurance keeps the sideways killjoy of rust which can undermine paint coatings.

9 - Ease of inspection
Excited steel disentangles investigation of the defensive completion. The idea of the procedure is with the end goal that if the covering looks persistent and sound, it is! Thicknesses - just determined through BS EN ISO 1461 - can be effectively checked with an electronic probe.

10 - Faster construction
Aroused steel is prepared for use. No further site surface arrangement, painting, contact up or investigation is vital. Once built the stirred steel is prepared for use: and cladding can start quickly, in this manner quickening the development time.



AS/NZS 1214 Hot dip galvanized coatings on threaded fasteners
AS 1627.1 Preparation and pre-treatment of surfaces – Removal of oil, grease and related contamination
AS 1627.4 Preparation and pre-treatment of surfaces – Abrasive blast cleaning of steel
AS 1627.5 Preparation and pre-treatment of surfaces – Pickling
AS/NZS 2312.2 Guide to the protection of structural steel against atmospheric corrosion by the use of protective coatings – Part 2: Hot dip galvanizing
AS 4312 Atmospheric corrosivity zones in Australia
AS/NZS 4680 Hot-dip galvanized (zinc) coatings on fabricated ferrous articles


Table 1. Requirements for coating thickness and mass for articles that are not centrifuged

Steel Thickness mm Local coating thickness minimum μm Average coating thickness minimum μm Average coating mass minimum g/m²
≤1.5 35 45 320
>1.5 to ≤3 45 55 390
>3 to ≤6 55 70 500
>6 70 85 600


Table 2. Requirements for coating thickness and mass for articles that are centrifuged

Thickness of articles (all components including castings) mm Local coating thickness minimum μm Average coating thickness minimum μm Average coating mass minimum g/m²
<8 25 35 250
≥8 40 55 390


Advantages of Hot Dip Galvanized Fasteners

  • Low Cost Coating
  • Long Coat Life
  • Reliability
  • Speed of Application
  • Coating Toughness
  • Complete Protection
  • Ease of inspection



12 Point Flange Bolt
round head bolts
Carriage Bolts
Flange Bolts
Structural Bolts
Tension Indicating Bolts
Heavy Hex Cap Screws & Heavy Hex Bolts
Square Head Bolts
Serrated Flange Bolts
Plow Bolts
Hanger Bolts
Elevator Bolts
Eye Bolts
Tension Control Bolts
Connector Bolts
Tower Bolts
Penta Bolts
Step Bolts
Coil Bolts
Sidewalk Bolts
Timber Bolt
Bin Bolts
U-Bolt Plates
Track Bolts
Hurricane Bolts
Draw Bolts
Lag Bolt
Stove Bolt
Machine Bolt
Tap Bolt
Shoulder Bolt
T Head Bolts
Screw Thread Eye Bolt
Square U Bolts
Through Bolts
Toggle Bolts
Torx Bolts
Wing Bolts
Bent Bolts
Banjo Bolts
Anchor Bolts
Allen Head
Threaded Rod
Turned Eye Bolts
socket head
Wheel Bolts
Cable Reel Bolts
Button Head Bolts
Bolt Caps
Tee Hammer Bolts
Fish Bolts
Castle Tap Bolts
Counter Sunk Bolts
Deck Bolts
Eye Bolts Without Shoulder
Serrated Flange Bolts
Freight Car Bolts
Shoulder Eye Bolts
Hex Head Hollow Bolts
Hex Flange Bolts
Hex Head Bolts
Hollow Allen Head Bolts
Stud Bolts
Lifting Eye Bolt
Long Bolts
Jack Bolt
Rod Ends Bolts
Roofing Bolts



Stainless Steel Bolts :
AISI 302, 304, 304L,316, 316L, 310, 317, 317L, 321, 347, 410, 420,904L etc.

Duplex & Super Duplex Steel Bolts :
ASTM / ASME A815 UNS No. S31803, UNS No. S 32205, UNS No. S 31254, UNS No. S 31550, UNS No. S 32750, and UNS No. S 32760

Carbon Steel Bolts :
ASTM A307, A193

Alloy Steel Bolts :
ASTM / ASME A/SA 193 / 194 B 6, B 7/ B 7M, B 16, 2, 2HM, 2H, GR 6, B 7, B 7M

Nickel Bolts Alloy Bolts :
ASTM / ASME SB 160 / 164 / 425 / 166 / 446 / 574 / 472 UNS 2200 (Nickel Bolts 200) / UNS 2201 (Nickel Bolts 201), UNS 4400 (MONEL 400), UNS 8825 (Inconel 825), UNS 6600 (Inconel 600) / UNS 6601 (Inconel 601), UNS 6625 (Inconel 625), UNS 10276 (HASTELLOY C 276), UNS 8020 (ALLOY 20 / 20 CB 3)


Bolts Material & Grade

Stainless Steel Bolts

  •  304 Stainless Steel Bolts
  •  304L Stainless Steel Bolts
  •  904L Stainless Steel Bolts
  •  17-4PH Stainless Steel Bolts
  •  304H Stainless Steel Bolts
  •  310 Stainless Steel Bolts
  •  321 Stainless Steel Bolts
  •  347 Stainless Steel Bolts
  •  410 Stainless Steel Bolts
  •  310S Stainless Steel Bolts
  •  316 Stainless Steel Bolts
  •  316H Stainless Steel Bolts
  •  316L Stainless Steel Bolts
  •  317 Stainless Steel Bolts
  •  317L Stainless Steel Bolts
  •  321H Stainless Steel Bolts
  •  446 Stainless Steel Bolts


Carbon Steel Bolts

  • A307 Bolts
  • A563 Bolts


Alloy Steel Bolts

  • A193 Bolts
  • A320 Bolts


Inconel Bolts

  • Incoloy 925 Bolts
  • Incoloy 825 Bolts
  • Inconel 625 Bolts
  • Inconel 601 Bolts
  • Inconel 602 Bolts
  • Inconel 603 Bolts
  • Incoloy 800 Bolts
  • Incoloy 800H Bolts
  • Inconel 600 Bolts
  • Inconel 686 Bolts


Monel Bolts

  • Monel K-500 Bolts
  • Monel 400 Bolts


Hastelloy Bolts

  • Hastelloy C22 Bolts
  • Hastelloy C276 Bolts


Titanium Bolts

  • Titanium Grade 5 Bolts
  • Titanium Grade 2 Bolts


Stock Of Bolts As Per ASTM Specification

  • ASTM A193 Bolts
  • ASTM A307 Bolts
  • ASTM A320 Bolts
  • ASTM A325 Bolts
  • ASTM A354 Bolts
  • ASTM A449 Bolts
  • ASTM A490 Bolts
  • ASTM F593 Bolts
  • ASTM F1554 Bolts
  • ASTM F3125 Bolts


Bolts As Per DIN Specification

  • ASTM A193 Bolts
  • ASTM A307 Bolts
  • ASTM A320 Bolts
  • ASTM A325 Bolts
  • ASTM A354 Bolts
  • ASTM A449 Bolts
  • ASTM A490 Bolts
  • ASTM F593 Bolts
  • ASTM F1554 Bolts
  • ASTM F3125 Bolts


  • DIN 6921 Bolts
  • DIN 603 Bolts
  • DIN 2510 Bolts
  • DIN 580 Bolts
  • DIN 582 Bolts
  • DIN 444 Bolts
  • DIN 939 Bolts
  • DIN 933 Bolts
  • DIN 931 Bolts
  • DIN 976 Bolts
  • DIN 912 Bolts
  • DIN 6325 Bolts
  • DIN 6914 Bolts
  • DIN 3570 Bolts
  • DIN 7990 Bolts
  • DIN 1B Bolts
  • DIN 529 Bolts




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