Introduction

Special Fasteners are used for Special Purpose to meet specific & precise Engineering requirement meant every Industrial Field. These Special fasteners are distinguished from Standard Fasteners by Application/Dimensions/Material. Special Fasteners products brings new Upfront challenges for both user & manufacturer. Alloy Steel Tubes earnestly accepts & delivers such Projects with full Complaince to the Specific Requirements. Our track records renders the same.
Aerospace, Engine & Turbine Engineering are primary industries demanding such Special Purpose Fastener products. We offer Such Speciality in Material as well with sheer Customization. We also offer such Special Purpose Fasteners in General Steel Grades with Metric & Inch size configuration.

Product Range

Hex Bolts, Heavy Hex Bolts, lifting Bolts, Machine Bolts, Allen Bolts, Hex Screws, Socket head Cap Screws, Jack Screws, Hex Nuts, Heavy Hex Nuts, Special Fasteners, Machined Components, Forged Rings & Special Fastening Components which are out of Cold Forged Range
Material Range

Material Range

High Tensile, Structural Steel, Weathering Steel, High Temperature Alloys, Low temperature Alloys, High Carbon/Low Carbon, Marine Grade Alloys, Stainless Steel, Duplex Steel Alloys, Super Duplex Steel Alloys, Nickel based Alloys viz, Inconel, Incoloy, Monel, Hastelloy, Alloy 20, 6 Moly Alloys, Durahete, Tantalum, Titanium, Copper & Copper Nickel Based alloys, Aluminum & Aluminum Bronze Alloys, Phosphor bronze Alloys, Silicon Bronze Alloys, ASTM Standard Materials, ASME Coded Fastener Material etc

The majority of products are produced in the following strength grades :

  • property classes according to DIN EN ISO 898-1: 4.6, 5.6, 8.8, 10.9, 12.9
  • property classes according to ISO 898-2: 6, 8.10, 12

Steels for fasteners with specified elevated and/or low temperature properties according to :

  • DIN 267/13, DIN EN 10269 (DIN 17240, DIN 17280)
    • 26CrMo4 (1.7219)
    • Ck35 (1.1181)
    • 24CrMo5 (1.7258)
    • 21CrMoV57 (1.7709)
    • 40 CrMoV47 (1.7711)
    • X22CrMoV121 (1.4923)
    • X19CrMoVNbN111 (1.4913)
  • Corrosion
    • Resistant stainless steel according to DIN EN ISO 3506-1 and DIN EN ISO 3506/2: A2/50, A4/50, C3/80;
    • Resistant stainless steel according to EN 10088/3 (DIN 17440): X17CrNi 16-2 (1.4057), X5CrNi 18-10 (1.4301), X6CrNiMoTi 17-12-2 (1.4571);
  • Other
    • Cementation steels, low temperature service alloys and steels according to the arrangement with the customer.

Surface Refinement for Corrosion Resistance

  • hot blackening
  • electroplated coatings (zinc) — DIN EN ISO 4042
  • hot dip galvanized coatings — DIN EN ISO 10684
  • manganese phosphatization — DIN EN 12476
  • black oxide coatings on steel — DIN 50938
  • non – electrolytically applied zinc flake coatings.

Fastener Types

  • CustomClamp-Fastâ„¢
  • Form-Fastâ„¢
  • Screws
  • Special Screws
  • Special SEMS
  • Washer Assemblies
  • Double Ended Studs (Hex and Round Collar)
  • Long Screws
  • Locknuts
  • Nails
  • Solid Rivets
  • Pins
  • Shoulder Bolts / Screws
  • Terminal ScrewsPer print Fasteners

Materials (Metals)

  • Steel
  • Brass
  • Stainless
  • Aluminium
  • Copper
  • Bronze
  • Alloy Steel

Screw Head Types

  • Socket
  • Pan
  • Flat
  • Truss
  • Button
  • Round
  • Oval
  • Headless
  • Special
  • Wafer
  • Cheese

Thread Types

  • Machine
  • Sheet Metal
  • Drywall
  • Wood
  • Tri-Lobular
  • Twin Lead
  • UNC
  • UNF
  • Metric
  • Roll Formed
  • Rolled Grooves
  • Specials
  • Left Hand
  • Double Head

Pin Types

  • Headed
  • Hinge

Rivet Types

  • Solid
  • Washer Types
  • SEMS

Tolerance

  • IFI/DIN/JIS/Special
  • As Required

Finish

  • Zinc
  • Nickel
  • Passivation    Chrome
  • Black Oxide
  • Phosphate & Oil
  • Dip Spin
  • Heat Treating
  • Annealing
  • Nylon Patches
  • Brass
  • Bronze
  • Tin
  • Bright Dip
  • Galvanized
  • Dörkenâ„¢
  • PTFE
  • Head Painting