Sunday, August 19, 2012

Grade of Bolts

Dear Readers,
Being a construction engineer, we very often use the bolts. Generally the grades of bolts are starts from 4.6 to 12.9. Also known as Ordinary bolt (Commercial Grade),  HT Bolt (High Tension) & HSFG Bolts (High Strength Friction Grip).

The bolt designation system is based on two numbers. The first number represents the ultimate tensile strength of the bolt, 400 MPa, 800 MPa or 1200 MPa respectively. The second number represents the point at which the bolt will permanently stretch. A 4.6 grade bolt permanently stretches at 60% of its ultimate, an 8.8 grade bolt at 80% and a 12.9 grade bolt at 90 % of its ultimate.

Technically it can be quoted that the first number is the tensile strength of the bolt material (N2 )/100. The second number is = 1/100.(the ratio of the Proof (or Yield ) stress and the Tensile strength expressed as a percentage = 100.[Yield (Proof stress) /Tensile strength] /100

For Example the tensile and proof strength of the steel for a 8.8 bolt is therefore calculated as follows
Tensile strength = 8 X 100 N/mm2 = 800 N/mm2 and Proof strength = 0.8*800 * 100 /100 = 640 N/mm2 (generally speaking 80% of 800N/mm2)

The lowest grade is 4.6, commonly known as commercial grade. Next comes grade 8.8, known as structural grade, and finally, the highest grade is 12.9, known as HT / HSFG bolt.
Available grade of bolts are 4.6, 4.8, 5.6, 5.8, 6.8, 8.8, 9.8, 10.9 & 12.9

For More Details about Torque Click Torque
For More Details about Torqe Calculation Click Calculation
For More Details about Slip Factor Click Factor

Best Quote. "Try not to become a man of success but a man of value". Have a Nice Day


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Abbreviations (20) Acre (2) ANSI (1) Anti friction bearing (2) Apothecaries Mass (1) Avoirdupois Mass (1) AWG (4) AWS (4) BCR 295 (2) Beam (19) Bearings (5) Blasting & Painting (5) Blogoversary (3) Bolt (4) CAR A/C (1) Cartoon (2) Cent (2) CHANNEL (7) Chequered Plate (1) Chinese (3) Civil (2) Classification (3) Cleaning (4) Cold Rolled Steel (2) Colour Code (1) Column Section (1) Computer (1) Concrete (1) Construction Industry (6) Conversion Table (2) Crane Rail (2) Density (1) Drill bit (1) Drill gauge (1) Drilling (1) Dry Ice (1) EHS (1) Ellipcon Steel (1) Elliptical Hollow Section (1) EN 10083-3 (1) EN 10219 (1) Engineer Day (7) Engineering Miracle (2) Environment (1) European Steel (3) Fibre Rope (3) Fire (1) FLAT (2) floating crane (1) Flood (1) Formula (1) GAUGE (9) General (25) Greetings (6) H-beam (4) Handrail (1) Heavy Weight Beam (1) Helmet (2) HEXAGOAN (2) Hollow Rectangle (3) Hollow Square (5) Hollow Steel (10) Hot rolled Steel (28) HR & IR (1) HSS (9) I-Beam (2) Information (5) Informations (4) Introduce (4) IPE (3) IS 1173 (5) IS 1786 (1) IS 3443 (2) IS 4923 (2) IS 808 (15) IS:1732 (1) ISA (2) ISCR (1) ISHB (3) ISJB (4) ISJC (2) ISLB (3) ISLC (2) ISMB (4) ISMC (2) ISMCP (1) ISNT (2) ISSC (2) ISWB (3) JIS G3466 (1) Joints (1) Junior Beam (2) Junior Channel (3) Labour Law (3) Labour Welfare (1) Land Measurement (2) Light Beam (1) Light Channel (3) LPG Cylinder (1) Mass (2) Measurement (3) Metals (4) Mile Stone (2) Music Wire (4) MWG (6) Numbers (3) OCTOGAN (1) Painting (4) Parallel Flange Channel (1) PFC (1) PIPE (1) Piping (1) Plastics (2) PPE (1) Precautions (2) Rain (1) Rebar (1) Reinforcement Rod (1) Reinforcemnt Steel (1) Reo (1) Rigging (8) River on River (1) Rope (6) ROUND (2) Safety (11) Scale (1) Self Explanatory (5) SEP (5) Short cut key (1) Sling (1) Slit Tee (1) Specific Gravity (3) SQUARE (1) SSPC (1) Steel (19) Steel Beam (7) Steel Section (6) Steel Section Type (5) Structural Steel (53) Surface Preparation (5) SWG (4) SWL (1) Technical (7) Tee Section (5) Thanks (7) Tools & Tackles (2) Torque (5) Troy Mass (1) TUBE (1) Turnbuckle (1) UB (2) UC (2) Unit of Mass (1) UNIT WEIGHT (48) Universal Beam (1) universal Column (2) Valve (1) Water (3) Weight (10) Welding (6) Wide Flange Beam (2) Wind (6) Wind Speed (4) Wire Rope (3) Wishes (14) WWD (1)


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