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Industrial Steel fasteners

Industrial Application

Hot Forged Fasteners
Material Technical Info
Stainless Steel 1400-1450 °C, Suitable for Marine Environments
Special Steel (Alloy 600/ 625/ C276) 2470 - 2575°F, For high temperature applications
Titanium Alloy

3020 - 3040 °F, Mainly used in Aerospace Industries

Production House

Products Size Range
Hex and Sockets M10 to M56
CNC Machined Components M4 to M100
Bolting and Studs M10 to M56
Nuts and washers M10 to M56


  • Metric Course
  • Metric Fine
  • BSF
  • BSW
  • UNF
  • BA
  • UN8
  • UNC

International Standards

Nuts ASME B18.2.2, BS 1768, BS 1769, ISO 4032, DIN 934
Bolts ASME B18.2.1, DIN 933, DIN 931, ISO 4017, ISO 4014, BS 1768, BS 1768, IFI 115
Stud Bolts ASME B16.5, DIN 976, DIN 975, BS 4882
Protective Coatings
  • Teflon / PTFE
  • Hot dipped galvanized
  • Phosphate coating
  • Xylan coating
  • Zinc coating
  • Cadmium coating
Manufacturing Process
Stainless Steel Bolts Manufacturing Process
Bolt Torque

Torque is a definition of the implementation of force acting at a radial interval. To simply put it, Torque is a turning force, created by a straight pull to create Tension in a threaded fastener. When a nut and Bolt are tight, the two plates are secured simultaneously. The thread present on the bolt shank converts the applied Torque into Tension, which in turn, gets converted to a clamping force. The tension amount generated in the Bolt is critical. A given Bolt that has achieved proper Tension works at its optimum efficiency. It will also resist coming undone or loose. However, in the event of the applied Tension being extremely low - the nut could vibrate, thus become loose. If the Tension is too high or overstretched in any circumstance, the Bolt could break. Every Bolt produced has an optimum torque value or tension figure for the given fastening application. The importance is to be given to these values to ensure the product will have a safe and efficient performance. Not to forget the economic value they offer. To calculate Torque, one must multiply the rate of the applied force by the Distance from the point of application. Using lesser applied force at a shorter distance will yield the same Torque as using a greater applied force at a long distance.

The constancy of machine parts subjected to both fluctuating loads and stress will depend on the fatigue strength of the corresponding materials. In the case of a threaded fastener, however, it relies on an elastic interaction linking the mating components. The main objective of a Torque is to clamp parts together with a tension higher than any external force that tries to disconnect them. At this time, the Bolt then remains under almost constant load, while exhibiting immunity to fatigue. If the bolt tension initially is too low, the fluctuating stress in the shank in much higher, thus quickly failing. The reliability, hence, depends on accurate initial Tension. Ensuring correct initial Tension is done by specifying and controlling the tightening Torque.

Stud Bolt
Stud Bolt
ASTM A193 Flange Bolt
ASTM A193 Flange Bolt
Hex Bolt
Hex Bolt
Hex Nut
Hex Nut
Both side threaded stud
Both side threaded stud
Eye Bolt
Eye Bolt
Common Grades and Equivalent standards
Grade ISO Standard JIS / SUS WNR. / EN
302 HQ A2 XM-7 1.4567
304 A2 304 1.4301
316 A4 316 1.4401
316 Cu A4 316 Cu
316 L A4 316 L 1.4404
410 C1 410 1.4006
430 F1 430 1.4016
Hex Bolts Dimensions

SS Hex Bolts Dimensions

Torque Chart
Torque Chart
Basic Standards
DIN 933 Hexagonal machine screws/ Bolts
ISO 1207, EN 21207, DIN 84 Socket cup screw
DIN EN 22339 Tapered Pins
ISO 8738, DIN EN 28738 Washer
ISO 8752, DIN EN 28752 Dowel Pin
DIN ISO 1481 Flat Head Tapping Screws
DIN ISO 1482 Tapping Screws with Slot, CSK
DIN ISO 1483 Flat Head Tapping Screws, Raised CSK
Bolts Allowable Shear Stress
SS Grade Surface Condition Specification and Condition Diameter d
Min. Tensile Requirements Allowable Shear Stress (ksi)
Strength - YS (ksi) 0.2%
Strength - TS (ksi)
No Threads
in Shear Plane
in Shear Plane
Hot Finished Annealed Condition A
in ASME SA 276 / ASTM A276-71
Class 1 (solution treated)
in ASME SA 193 / ASTM A193-71
all 30.0 75.0 15.0 10.5
Cold Finished Condition A (Annealed)
in ASTM A276-71
≤ 1⁄2 45.0 90.0 18.0 12.6
Cold Finished Cold-worked Condition B
in ASME SA 276 / ASTM A276-71
Class 2 (solution treated
and strain hardened)
in ASME SA 193 / ASTM A193-71*
≤ 3⁄4 100.0 125.0 25.0 17.5