AISI 4340 Fasteners

AISI 4340 Bolts

Boltport offers made to order AISI 4340 fasteners in varieties of bolts, screws, stud bolts, studs, threaded rods, nuts, washers, pins & other bolting components, in hot forged condition. We are a manufacturer and supplier of AISI 4340 fasteners, produced from high integrity 4340 bar stock or forging stock to various ASTM and international material specifications. AISI 4340 fasteners posseses high bolting strength and used for high temperature, high pressure applications. We offer both metric and imperial sizes bolting parts in 4340 alloy steel. Smaller sizes bolting are often manufactured through cold forming while bigger sizes and custom parts are produced through hot forming and bar machining. Automotive manufactures often refer to SAE Grade 4340 for ordering fasteners. AISI 4340 fastening components are widely used for bolting applications in automotives, structural construction, shipbuilding and repair, marine engineering, power plants, etc.

AISI 4340 is commonly produced in form of standard and heavy hex head bolts, socket head cap screws, allen head screws, countersunk screws, set screws, lifting eye bolts, eye nuts, hex nuts, heavy hex nuts, stud bolts, tap end studs, double end stud bolts, plain threaded rods, heavy duty washers, dowel pins and other customised bolting components.

Find information on this alloy grade such as chemical composition, mechanical properties, feasible fastener products, related material specifications and applications.

AISI 4340 Fasteners

  • AISI 4340 Bolts
    Bolts
  • AISI 4340 Screws
    Screws
  • AISI 4340 Stud Bolts
    Stud Bolts
  • AISI 4340 Threaded Rods
    Threaded Rods
  • AISI 4340 Nuts
    Nuts
  • AISI 4340 Washers
    Washers
  • AISI 4340 Accessories
    Accessories
  • AISI 4340 Components
    Components

AISI 4340 Properties

Chemical Composition

Carbon Manganese Sulphur Phosphorus Silicon Molybdenum Chromium Iron
0.38 - 0.43 % 0.75 - 1.00 % 0.04 % max 0.035 % max 0.15 - 0.30 % 0.15 - 0.25 % 0.80 - 1.10 % 96.78 - 97.77%

Mechanical Properties

Tensile Strength Yield Strength Hardness, Rockwell Hardness, Brinell
655 MPa (Min.) 415 MPa (Min.) 25 - 70 197 (Min.)

Specifications for AISI 4340 Fasteners

Specification Grade Products
ASTM A29 AISI 4340/UNS G43400 Bolts, Screws, Stud Bolts, Nuts, Bar Components
ASTM A108 AISI 4340/UNS G43400 Bolts, Screws, Stud Bolts, Nuts, Bar Components
ASTM A193 Grade B7/ B7M Bolts, Screws, Stud Bolts, Threaded Rods
ASTM A194 Grade 7/7M Nuts
ASTM A320 Grade L7/L7M/L7D Bolts, Screws, Stud Bolts, Threaded Rods
ASTM A322 AISI 4340/UNS G43400 Bolts, Screws, Stud Bolts, Nuts, Bar Components
ASTM A331 AISI 4340/UNS G43400 Bolts, Screws, Stud Bolts, Nuts, Bar Components
ASTM A506 AISI 4340/UNS G43400 Washers, Sheet Metal Components
ASTM A574 Grade 8 Socket Head cap Screws
ASTM A829 AISI 4340/UNS G43400 Washers, Sheet Metal Components
ASTM F568 Grade 12.9 Bolts, Screws, Stud Bolts, Threaded Rods
SAE J404 AISI 4340/UNS G43400 Chemical Composition Requirements
SAE J1397 AISI 4340/UNS G43400 Chemical Composition Requirements

Coating Option for AISI 4340 Fasteners

PTFE (Teflon) Hot Dip Galvanizing Aluminum Zinc Flake
Zinc Phosphating Manganese Phosphating Metallic Zinc
Nickel Plating Chrome Plating Cadmium Plating
Silver Plating Tin Plating

Applications for AISI 4340 Fasteners

Automotives Railways Structurals
Shipbuilding & Repairs Marine & Offshore Power Industry
Chemical Processing