Gulf Coast Fasteners Inc. - Premium Fastening Solutions

Stainless Steel Nuts
A394

Hot Dip Galvanizing per ASTM A153 CLASS B & C / F2329.
Mechanical Galvanizing per ASTM B695 CLASS 55.
Zinc Plating and Plain Finish.

A394 Tower Bolts come in the following types/grades:

  • Type 0 – Hot-Dip Zinc-Coated Bolts Made of Low or Medium-Carbon Steel
  • Type 1 – Hot-Dip Zinc-Coated Bolts Made of Medium Carbon Steel, Quenched and Tempered
The ASTM A153 Specification
Class Description Min. Avg. Coating Thickness, mils
B-1 3/16" and over in thickness and over 15" in length 3.4
B-2 Under 3/16" in thickness and over 15" in length 2.6
B-3 Any thickness and under 15" in length 2.2
C Fasteners over 3/8" in diameter and similar articles, washers 3/16" to 1/4" thick 2.1
The ASTM B695 Specification
Class Minimum Thickness, μm
55 53
Class 55 is the most common class used for ASTM fasteners and is roughly the same thickness as hot dip galvanizing per ASTM F2329. 53μm is equivalent to 0.002087 inches or 2.087 mils.
F2329 Coating Thickness
Dimension

Minimum Thickness on Surface
Average Thickness of all Specimens (Production lot) Average Thickness of all Specimens (Batch lot) Average Thickness of Individual Specimen
Fasteners over 3/8” in diameter 0.0020 in. 0.0017 in. 0.0017 in.
Washers 3/16" to 1/4" thick 0.0020 in. 0.0017 in. 0.0017 in.
Fasteners 3/8” and under in diameter 0.0017 in. 0.0015 in. 0.0015 in.
Washers under 3/16" thick 0.0017 in. 0.0015 in. 0.0015 in.
Stainless Steel Nuts
A325

Hot Dip Galvanizing per ASTM A153 CLASS B & C / F2329.
Mechanical Galvanizing per ASTM B695 CLASS 55.
Zinc Plating and Plain Finish.

Structural Bolts come in the following types/grades:

  • A325 Tension Control
  • A490 Tension Control
  • A325 Type 1
  • A325 Type 1 Tap
  • A325 Type 3
  • A449 Hex Bolt
  • A490 Type 1
The ASTM A153 Specification
Class Description Min. Avg. Coating Thickness, mils
B-1 3/16" and over in thickness and over 15" in length 3.4
B-2 Under 3/16" in thickness and over 15" in length 2.6
B-3 Any thickness and under 15" in length 2.2
C Fasteners over 3/8" in diameter and similar articles, washers 3/16" to 1/4" thick 2.1
The ASTM B695 Specification
Class Minimum Thickness, μm
55 53
Class 55 is the most common class used for ASTM fasteners and is roughly the same thickness as hot dip galvanizing per ASTM F2329. 53μm is equivalent to 0.002087 inches or 2.087 mils.
F2329 Coating Thickness
Dimension

Minimum Thickness on Surface
Average Thickness of all Specimens (Production lot) Average Thickness of all Specimens (Batch lot) Average Thickness of Individual Specimen
Fasteners over 3/8” in diameter 0.0020 in. 0.0017 in. 0.0017 in.
Washers 3/16" to 1/4" thick 0.0020 in. 0.0017 in. 0.0017 in.
Fasteners 3/8” and under in diameter 0.0017 in. 0.0015 in. 0.0015 in.
Washers under 3/16" thick 0.0017 in. 0.0015 in. 0.0015 in.
Bolts and screws used in construction
A307

Hot Dip Galvanizing per ASTM A153 CLASS B & C / F2329.
Mechanical Galvanizing per ASTM B695 CLASS 55.
Zinc Plating and Plain Finish.
Bolts and Screws come in the following types/grades:

  • A307 Grade A/Tap Bolts
  • A307 Grade B
  • B7 Hex Bolt
  • Gr.2 Cap Screws
  • Gr.5 Cap Screws
  • Gr.8 Cap Screws
  • Hex Lag Screw
  • Carriage Bolts
  • Square Head Bolts
  • Flat Slot Cap Screws
  • Round Slot Cap Screws
  • Button Socket Cap Screws
  • Stainless Hex Bolts
The ASTM A153 Specification
Class Description Min. Avg. Coating Thickness, mils
B-1 3/16" and over in thickness and over 15" in length 3.4
B-2 Under 3/16" in thickness and over 15" in length 2.6
B-3 Any thickness and under 15" in length 2.2
C Fasteners over 3/8" in diameter and similar articles, washers 3/16" to 1/4" thick 2.1
The ASTM B695 Specification
Class Minimum Thickness, μm
55 53
Class 55 is the most common class used for ASTM fasteners and is roughly the same thickness as hot dip galvanizing per ASTM F2329. 53μm is equivalent to 0.002087 inches or 2.087 mils.
F2329 Coating Thickness
Dimension

Minimum Thickness on Surface
Average Thickness of all Specimens (Production lot) Average Thickness of all Specimens (Batch lot) Average Thickness of Individual Specimen
Fasteners over 3/8” in diameter 0.0020 in. 0.0017 in. 0.0017 in.
Washers 3/16" to 1/4" thick 0.0020 in. 0.0017 in. 0.0017 in.
Fasteners 3/8” and under in diameter 0.0017 in. 0.0015 in. 0.0015 in.
Washers under 3/16" thick 0.0017 in. 0.0015 in. 0.0015 in.
Steel fasteners made steel
Nut

Hot Dip Galvanizing per ASTM A153 CLASS B & C / F2329.
Mechanical Galvanizing per ASTM B695 CLASS 55.
Zinc Plating and Plain Finish.

Nuts in the following types:

  • A563 Gr.A
  • A563 Gr.C & C3
  • A563 Gr DH & DH3
  • A194 Gr.2H
  • Dual Certified 2H/DH
  • Finish HEX JAM Nut
  • Heavy HEX JAM Nut
  • Pal Nut
  • ANCO Lock Nut
The ASTM A153 Specification
Class Description Min. Avg. Coating Thickness, mils
B-1 3/16" and over in thickness and over 15" in length 3.4
B-2 Under 3/16" in thickness and over 15" in length 2.6
B-3 Any thickness and under 15" in length 2.2
C Fasteners over 3/8" in diameter and similar articles, washers 3/16" to 1/4" thick 2.1
The ASTM B695 Specification
Class Minimum Thickness, μm
55 53
Class 55 is the most common class used for ASTM fasteners and is roughly the same thickness as hot dip galvanizing per ASTM F2329. 53μm is equivalent to 0.002087 inches or 2.087 mils.
F2329 Coating Thickness
Dimension

Minimum Thickness on Surface
Average Thickness of all Specimens (Production lot) Average Thickness of all Specimens (Batch lot) Average Thickness of Individual Specimen
Fasteners over 3/8” in diameter 0.0020 in. 0.0017 in. 0.0017 in.
Washers 3/16" to 1/4" thick 0.0020 in. 0.0017 in. 0.0017 in.
Fasteners 3/8” and under in diameter 0.0017 in. 0.0015 in. 0.0015 in.
Washers under 3/16" thick 0.0017 in. 0.0015 in. 0.0015 in.
Round Copper Punch Groove Lots of yellow paint
A picture of metal washers

Hot Dip Galvanizing per ASTM A153 CLASS B & C / F2329.
Mechanical Galvanizing per ASTM B695 CLASS 55.
Zinc Plating and Plain Finish.

Washers in the following types/grades:

  • F959 (DTI) Load Indicator Washers
  • Regular, Squirter, Dura-Squirt
  • A325 Type 1
  • A325 Type 3
  • A490 Type 1
  • F436 Hard Round Washers
  • F436 Type 3 Hard Round Washers
  • USS Flat Washers
  • Split Lock Washers
  • Hillside Washers
  • Millicarb Washers
  • F436 Harb Bevel Washers
  • Fender Washers
  • Hillside Washers
The ASTM A153 Specification
Class Description Min. Avg. Coating Thickness, mils
B-1 3/16" and over in thickness and over 15" in length 3.4
B-2 Under 3/16" in thickness and over 15" in length 2.6
B-3 Any thickness and under 15" in length 2.2
C Fasteners over 3/8" in diameter and similar articles, washers 3/16" to 1/4" thick 2.1
The ASTM B695 Specification
Class Minimum Thickness, μm
55 53
Class 55 is the most common class used for ASTM fasteners and is roughly the same thickness as hot dip galvanizing per ASTM F2329. 53μm is equivalent to 0.002087 inches or 2.087 mils.
F2329 Coating Thickness
Dimension

Minimum Thickness on Surface
Average Thickness of all Specimens (Production lot) Average Thickness of all Specimens (Batch lot) Average Thickness of Individual Specimen
Fasteners over 3/8” in diameter 0.0020 in. 0.0017 in. 0.0017 in.
Washers 3/16" to 1/4" thick 0.0020 in. 0.0017 in. 0.0017 in.
Fasteners 3/8” and under in diameter 0.0017 in. 0.0015 in. 0.0015 in.
Washers under 3/16" thick 0.0017 in. 0.0015 in. 0.0015 in.