Steel fasteners manufacturer in India


Steel fasteners manufacturer in India
Corporate Address
Corporate Address



Corporate Address
Corporate Address
Corporate Address
Corporate Address
Corporate Address
Corporate Address
Corporate Address
Corporate Address
Corporate Address


Corporate Address
Corporate Address



ASTM fasteners are available in different grades such as A193 / B633 / A307

Steel fasteners

Steel fasteners

Steel hex bolt and nut

Steel hex bolt and nut

ASTM fasteners

ASTM fasteners

Steel fasteners specification

Imperial Sizes Metric Sizes Length
3/4″-10″ or Customized M3 to M56 3 MM – 200 MM
Manufacturing Process Testing Heat Treatment
  • Machining
  • Cold forging
  • Hot forging
  • IGC Test
  • Hardness Test
  • Tensile Testing
  • PMI Test
  • Impact Testing
  • Tempering
  • Hardening
  • Spheroidizing
  • Stress Relieving
Neck types Surface Finish Threads
  • Square
  • Oval
  • Knurled
  • Hex
  • Triangular
  • Phosphating
  • Oxidation
  • DACROMET
  • Plain
  • Electric galvanized
  • HDG
  • Zinc impregnation
  • UNF
  • UNC
  • BSF
  • UNR
  • UNJ
  • UN8
Testing reports provided by Nitron alloys Coatings Drive Types
  • Free quote
  • EN 10204 3.1
  • Mill Test Certificate
  • Free sample
  • Raw Materials Certificate
  • Third Party Inspection Report
  • NABL Approved Lab Reports
  • Galvanised
  • Electroless nickel
  • PTFE
  • Dacromet
  • Zinc
  • Sherardized
  • One Way
  • Frearson
  • Hex, Socket or Allen
  • Phillips
  • Combination
  • Slotted
  • Square
  • Star
Head Style Applications
  • Button
  • Pan
  • Socket Cap
  • Round
  • Hex Washer
  • Hexagon
  • Truss
  • Oval
  • Slotted Hex Washer
  • Flat
  • Wooden structures
  • Sea water
  • Geothermal
  • Automobiles
  • Oil & gas
  • Chemical process
  • Machinery
  • Water desalination

We are stockist of steel hex bolt and nut

Steel hex bolt coating

  • Chrome
  • Nickel-Plated
  • Yellow Zinc
  • Hot Dip Galvanized
  • Electro Galvanized
  • Grey Phosphate
  • Ceramic Coated

Buy steel lock nut and studs at factory price in Mumbai

Steel bolt dimensions

Steel bolt dimensions

Bolt Size C (min) B A (max) D F
Thread Length
for Bolt Length		 E
6" and
shorter		 over 6" max min
1/4" 0.484 7/16 0.260 11/64 0.750 1.000 0.03 0.01
5/16" 0.552 1/2 0.324 7/32 0.875 1.125 0.03 0.01
3/8" 0.620 9/16 0.388 1/4 1.000 1.250 0.03 0.01
7/16" 0.687 5/8 0.452 19/64 1.125 1.375 0.03 0.01
1/2" 0.826 3/4 0.515 11/32 1.250 1.500 0.03 0.01
5/8" 1.033 15/16 0.642 27/64 1.500 1.750 0.06 0.02
3/4" 1.240 1-1/8 0.768 1/2 1.750 2.000 0.06 0.02
7/8" 1.447 1-5/16 0.895 37/64 2.000 2.250 0.06 0.02
1" 1.653 1-1/2 1.022 43/64 2.250 2.500 0.09 0.03
1-1/8" 1.859 1-11/16 1.149 3/4 2.500 2.750 0.09 0.03
1-1/4" 2.066 1-7/8 1.277 27/32 2.750 3.000 0.09 0.03
1-3/8" 2.273 2-1/16 1.404 29/32 3.000 3.250 0.09 0.03
1-1/2" 2.480 2-1/4 1.531 1 3.250 3.500 0.09 0.03
1-3/4" 2.893 2-5/8 1.785 1-5/32 3.750 4.000 0.12 0.04
2" 3.306 3 2.039 1-11/32 4.250 4.500 0.12 0.04
2-1/4" 3.719 3-3/8 2.305 1-1/2 4.750 5.000 0.19 0.06
2-1/2" 4.133 3-3/4 2.559 1-21/32 5.250 5.500 0.19 0.06
2-3/4" 4.546 4-1/8 2.837 1-13/16 5.750 6.000 0.19 0.06
3" 4.959 4-1/2 3.081 2 6.250 6.500 0.19 0.06
3-1/4" 5.372 4-7/8 3.335 2-3/16 6.750 7.000 0.19 0.06
3-1/2" 5.786 5-1/4 3.589 2-5/16 7.250 7.500 0.19 0.06
3-3/4" 6.198 5-5/8 3.858 2-1/2 7.750 8.000 0.19 0.06
4" 6.612 6 4.111 2-11/16 8.250 8.500 0.19 0.06

Bolt length tolerances

Nominal Length, in. Nominal Size, in.
1⁄2 5⁄8 3⁄4 thru 1 11⁄8 thru 11⁄2
Over 6 in. -0.19 -0.25 -0.25 -0.25
Thru 6 in. -0.12 -0.12 -0.19 -0.25
One of the leading steel nut bolt and screws supplier in India

ASTM Fasteners grades

ASTM Designation Size Range
(in) 		Material
A325 type 1 1/2 - 1
1 1/8 - 1 1/2		 Medium carbon steel, Q & T
A325 type 2 1/2 - 1
1 1/8 - 1 1/2		 Low carbon martensite steel, Q & T
A325 type 3 1/2 - 1
1 1/8 - 1 1/2		 Weathering steel, Q & T
A307 1/4 - 4 Low carbon steel
A449 1/4 - 1
1 1/8 - 1 1/2
1 3/4 - 3		 Medium carbon steel, Q & T
A354 grade BC Alloy steel, Q & T
A354 grade BD 1/4 - 4 Alloy steel, Q & T
A490 type 1 1/2 - 1 1/2 Alloy steel, Q & T
A490 type 3 Weathering steel, Q & T

Minimum clearance hole diameters of steel bolts

Bolt Size Close Fit [inch] Normal Fit [inch] Bolt Dia. [inch] Loose Fit [inch]
#0 0.067 0.076 0.0600 0.094
#2 0.094 0.102 0.0860 0.116
#4 0.120 0.128 0.1120 0.144
#5 0.141 0.156 0.1250 0.172
#6 0.154 0.170 0.1380 0.185
#8 0.180 0.196 0.1640 0.213
#10 0.206 0.221 0.1900 0.238
1/4" 0.266 0.281 0.2500 0.297
5/16" 0.328 0.344 0.3125 0.359
3/8" 0.391 0.406 0.3750 0.422
7/16" 0.453 0.469 0.4375 0.484
1/2" 0.531 0.562 0.5000 0.609
5/8" 0.656 0.688 0.6250 0.734
3/4" 0.781 0.812 0.7500 0.906
7/8" 0.906 0.938 0.8750 1.031
1" 1.031 1.094 1.0000 1.156
1-1/8" 1.156 1.219 1.1250 1.312
1-1/4" 1.281 1.344 1.2500 1.438
1-3/8" 1.438 1.500 1.3750 1.609
1-1/2" 1.562 1.625 1.5000 1.734

Flat Washer Dimensions

Size Outer Dia,
Basic [inch]		 Basic Dia. [inch] Inner Dia,
Basic [inch]		 Series Thickness,
Basic [inch]
#0 0.188 0.0600 0.078 --- 0.020
#2 0.250 0.0860 0.094 --- 0.020
#4 0.312 0.1120 0.125 --- 0.032
#6 0.375 0.1380 0.156 --- 0.049
#8 0.438 0.1640 0.188 --- 0.049
#10 0.500 0.1900 0.219 --- 0.049
1/4" 0.625 0.2500 0.281 Narrow 0.065
1/4" 0.734 0.2500 0.312 Wide 0.065
5/16" 0.688 0.3125 0.344 Narrow 0.065
5/16" 0.875 0.3125 0.375 Wide 0.083
3/8" 0.812 0.3750 0.406 Narrow 0.065
3/8" 1.000 0.3750 0.438 Wide 0.083
7/16" 0.922 0.4375 0.469 Narrow 0.065
7/16" 1.250 0.4375 0.500 Wide 0.083
1/2" 1.062 0.5000 0.531 Narrow 0.095
1/2" 1.375 0.5000 0.562 Wide 0.109
9/16" 1.156 0.5625 0.594 Narrow 0.095
9/16" 1.469 0.5625 0.625 Wide 0.109
5/8" 1.312 0.6250 0.656 Narrow 0.095
5/8" 1.750 0.6250 0.688 Wide 0.134
3/4" 1.469 0.7500 0.812 Narrow 0.134
3/4" 2.000 0.7500 0.812 Wide 0.148
7/8" 1.750 0.8750 0.938 Narrow 0.134
7/8" 2.250 0.8750 0.938 Wide 0.165
1" 2.000 1.0000 1.062 Narrow 0.134
1" 2.500 1.0000 1.062 Wide 0.165
1-1/8" 2.250 1.1250 1.250 Narrow 0.134
1-1/8" 2.750 1.1250 1.250 Wide 0.165
1-1/4" 2.500 1.2500 1.375 Narrow 0.165
1-1/4" 3.000 1.2500 1.375 Wide 0.165
1-3/8" 2.750 1.3750 1.500 Narrow 0.165
1-3/8" 3.250 1.3750 1.500 Wide 0.180
1-1/2" 3.000 1.5000 1.625 Narrow 0.165
1-1/2" 3.500 1.5000 1.625 Wide 0.180
1-5/8" 3.750 1.6250 1.750 --- 0.180
1-3/4" 4.000 1.7500 1.875 --- 0.180
1-7/8" 4.250 1.8750 2.000 --- 0.180
2" 4.500 2.0000 2.125 --- 0.180
We supply steel rivets in size range of 1/2" to 12"

Imperial Bolt Size Chart

Nominal Size Bolt Diameter ‘D’ Across Flats ‘A’ Across Corners ‘B’ Head Height ‘C’ Thread Length ‘L’ Transition Length ‘Y’
Max (in) Min (in) Nominal (in) Max (in) Min (in) Max (in) Min (in) Nominal (in) Max (in) Min (in) ≤6 in >6 in Max (in)
1/4 0.25 0.245 7/16 0.438 0.428 0.505 0.488 5/32 0.163 0.15 0.75 1 0.25
5/16 0.3125 0.3065 1/2 0.5 0.489 0.577 0.557 13/64 0.211 0.195 0.875 1.125 0.278
3/8 0.375 0.369 9/16 0.562 0.551 0.65 0.628 15/64 0.243 0.226 1 1.25 0.312
7/16 0.4375 0.4305 5/8 0.625 0.612 0.722 0.698 9/32 0.291 0.272 1.125 1.375 0.357
1/2 0.5 0.493 3/4 0.75 0.736 0.866 0.84 5/16 0.323 0.302 1.25 1.5 0.385
9/16 0.5625 0.5545 13/16 0.812 0.798 0.938 0.91 23/64 0.371 0.348 1.375 1.625 0.417
5/8 0.625 0.617 15/16 0.938 0.922 1.083 1.051 25/64 0.403 0.378 1.5 1.75 0.455
3/4 0.75 0.741 1-1/8 1.125 1.1 1.299 1.254 15/32 0.483 0.455 1.75 2 0.5
7/8 0.875 0.866 1-5/16 1.312 1.285 1.516 1.465 35/64 0.563 0.531 2 2.25 0.556
1 1 0.99 1-1/2 1.5 1.469 1.732 1.675 39/64 0.627 0.591 2.25 2.5 0.625
1-1/8 1.125 1.114 1-11/16 1.688 1.631 1.949 1.859 11/16 0.718 0.658 2.5 2.75 0.714
1-1/4 1.25 1.239 1-7/8 1.875 1.812 2.165 2.066 25/32 0.813 0.749 2.75 3 0.714
1-3/8 1.375 1.363 2-1/16 2.062 1.994 2.382 2.273 27/32 0.878 0.81 3 3.25 0.833
1-1/2 1.5 1.488 2-1/4 2.25 2.175 2.598 2.48 1-5/16 0.974 0.902 3.25 3.5 0.833
1-3/4 1.75 1.738 2-5/8 2.625 2.538 3.031 2.89 1-3/32 1.134 1.054 3.75 4 1
2 2 1.988 3 3 2.9 3.464 3.306 1-7/32 1.263 1.175 4.25 4.5 1.111
2-1/4 2.25 2.238 3-3/8 3.375 3.262 3.897 3.719 1-3/8 1.423 1.327 4.75 5 1.111
2-1/2 2.5 2.488 3-3/4 3.75 3.625 4.33 4.133 1-17/32 1.583 1.479 5.25 5.5 1.25
2-3/4 2.75 2.738 4-1/8 4.125 3.988 4.763 4.546 1-11/16 1.744 1.632 5.75 6 1.25
3 3 2.988 4-1/2 4.5 4.35 5.196 4.959 1-7/8 1.935 1.815 6.25 6.5 1.25

Thread pitch of steel bolt

Bolt Size Thread Pitch
(inch) Coarse Fine
1/4 20 28
5/16 18 24
3/8 16 24
7/16 14 20
1/2 13 20
9/16 12 18
5/8 11 18
3/4 10 16
7/8 9 14
1 8 14
1-1/8 7 12
1-1/4 7 12
1-3/8 6 12
1-1/2 6 12
1-3/4 5
2 4-1/2
2-1/2 4
3 4


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