ASME Standard

ASME is a global non-profit engineering organization dedicated to advancing engineering technology and its application to solve complex real-world challenges. Since its founding in 1880 (American Society of Mechanical Engineers), ASME has been committed to promoting collaboration and exchange across engineering disciplines, encouraging knowledge transfer and skill development, and actively advocating for the critical role engineers play in driving societal progress.

  • ASME B16.5 Dimensions and tolerances for studs, hex bolts for class 150/300/400/600/900/1500/2500 flanges from 1/2 to 24 inch size.
  • ASME B16.47 Dimensions and tolerances for studs, hex bolts for class 150/300/400/600/900 flanges from 26 to 60 inch size.
  • ASME B18.10 Standard Dimensions for oval neck track bolts and nuts.
  • ASME B18.15 Standard Dimensions for carbon and stainless steel forged eye bolts, shoulder pattern and plain.
  • ASME B18.16.3M Standard Dimensions for prevailing-torque type steel metric hex nuts and hex flange nuts.
  • ASME B18.16.4 Dimension standard for serrated hex flange nuts.
  • ASME B18.16.6 Dimension standard for nylon insert hex lock nuts.
  • ASME B18.2.1 Dimension standard for Square, Hex, Heavy Hex, Askew Head Bolts, Hex Flange, Lobed Head, and Lag Screws.
  • ASME B18.2.2 Dimension standard for Machine Screw Nuts, Hex, Square, Hex Flange, and Coupling Nuts.
  • ASME B18.2.3.1M Dimension standard for metric hex cap screws from M5 to M100.
  • ASME B18.2.3.2M Dimension standard for metric hex cap screws from M5 to M24.
  • ASME B18.2.3.3M Dimension standard for metric heavy hex cap screws from M12 to M36.
  • ASME B18.2.3.4M Dimension standard for metric hex flange screws from M5 to M16.
  • ASME B18.2.3.5M Dimension standard for metric hex bolts from M5 to M100.
  • ASME B18.2.3.6M Dimension standard for metric heavy hex bolts from M12 to M36.
  • ASME B18.2.3.7M –
  • ASME B18.2.3.8M –
  • ASME B18.2.3.9M Metric Heavy Hex Flange Screws
  • ASME B18.2.4.1M
  • ASME B18.2.4.2M
  • ASME B18.2.4.3M Metric Slotted Hex Nuts
  • ASME B18.2.4.4M
  • ASME B18.2.4.5M
  • ASME B18.2.4.6M
  • ASME B18.2.5M Metric 12-Point Flange Head Screws
  • ASME B18.2.6 Fasteners for Use in Structural Applications
  • ASME B18.2.6M Metric Fasteners for Use in Structural Applications
  • ASME B18.21.1 Washers: Helical Spring-Lock, Tooth Lock, and Plain Washers (Inch Series)
  • ASME B18.21.2M Lock Washers (Metric Series)
  • ASME B18.21.3 Double Coil Helical Spring Lock Washers for Wood Structures
  • ASME B18.22.1
  • ASME B18.22M Metric Plain Washers
  • ASME B18.3 Socket Cap, Shoulder, Set Screws, and Hex Keys (Inch Series)
  • ASME B18.3.1M
  • ASME B18.31.1M Metric Continuous and Double-End Studs
  • ASME B18.31.2 Continuous Thread Stud, Double-End Stud, and Flange Bolting Stud (Stud Bolt) (Inch Series)
  • ASME B18.31.3
  • ASME B18.31.5 Bent Bolts (Inch Series)
  • ASME B18.5 Round Head Bolts (Inch Series)
  • ASME B18.5.2.1M Metric Round Head Short Square Neck Bolts
  • ASME B18.5.2.2M
  • ASME B18.5.2.3M
  • ASME B5.1M T-Slots, Their Bolts, Nuts, and Tongues
  • ASME B5.48 Ball Screws
  • ASME B18.6.1 Wood Screws (Inch Series)
  • ASME B18.6.2 Square Head Set Screws and Slotted Headless Set Screws (Inch Series)
  • ASME B18.6.3 Machine Screws, Tapping Screws, and Metallic Drive Screws (Inch Series)
  • ASME B18.6.5M Metric Thread-Forming and Thread-Cutting Tapping Screws
  • ASME B18.6.7M Metric Machine Screws
  • ASME B18.6.9 Wing Nuts (Inch Series)
  • ASME B18.8.1
  • ASME B18.8.2
  • ASME B18.9 Plow Bolts