Premium Fasteners & Round Bars supplied across Europe, Russia, Saudi Arabia, Oman, Qatar & the USA!

  • Mumbai 400004 - India.
  • +919819823285
  • info@starentps.com

Comprehensive Range of Bolts, Nuts, Studs, Screws & Washers in Mild Steel, SS, High Tensile & Nickel Alloys – Supplied with MTC as per EN 10204 3.1/3.2 and Compliance to ASTM, DIN, ISO, BS Standards.

Our company stands as a premier manufacturer and exporter of high-quality fasteners with a strong presence in global markets such as Europe, Russia, Saudi Arabia, Oman, Qatar, and the USA. Established with a vision to deliver excellence, we have grown over the years by adhering to strict quality protocols and adopting cutting-edge technology. Our state-of-the-art manufacturing facilities are equipped with advanced machinery to produce a wide variety of fasteners that meet international benchmarks. We focus on providing customized solutions tailored to specific client requirements across diverse industries including automotive, construction, oil and gas, heavy engineering, and infrastructure development. Our dedicated team ensures every product leaving our factory undergoes thorough inspection to guarantee maximum reliability and performance, making us a trusted partner worldwide.

Our extensive range of fasteners includes bolts, nuts, screws, studs, washers, rivets, anchors, and specialized components available in an array of sizes, thread types, and finishes. Each product is meticulously engineered to meet stringent technical parameters such as tensile strength, yield strength, elongation, hardness, and fatigue resistance. The fasteners conform to globally recognized ASTM standards including ASTM A193, A194, A307, A325, and others, ensuring compatibility with diverse industrial applications. Our in-house quality labs conduct dimensional verification, mechanical testing, and surface finish evaluations, while also implementing non-destructive testing methods to detect internal flaws. This rigorous testing regime guarantees that our fasteners perform exceptionally even in harsh environments and critical applications, thereby enhancing the safety and durability of end products.

We manufacture fasteners using a variety of premium materials such as stainless steel grades SS304, SS316, and SS410; carbon steel; alloy steel; and special metals like titanium and nickel alloys. Each material is carefully selected to offer optimum strength, corrosion resistance, and longevity. We strictly adhere to internationally recognized material grades and standards including ASTM, AISI, DIN, and ISO. Our chemical composition analysis ensures precise control over elements like carbon, manganese, sulfur, phosphorus, chromium, and nickel to meet or exceed customer specifications. Moreover, our production processes follow stringent quality management practices certified under ISO 9001:2015, ISO 14001, and OHSAS 18001, ensuring consistent product quality, safety, and environmental responsibility. These certifications reflect our commitment to delivering fasteners that not only meet but surpass industry expectations.

Understanding the critical nature of product handling and logistics, we provide customized packing solutions that safeguard fasteners from damage during transit. Packaging options range from bulk packaging to specialized crates and pallets, designed according to the destination market’s requirements and client preferences. Our efficient supply chain management ensures timely dispatch and delivery through reputed carriers and freight forwarders worldwide. With a strong export footprint covering Europe, Russia, Saudi Arabia, Oman, Qatar, and the USA, we comply with all international trade regulations, including customs documentation, export certifications, and product traceability. Our dedicated export team works closely with clients to facilitate smooth clearance and on-time delivery. Partnering with us guarantees not just quality fasteners but also reliable service, competitive pricing, and comprehensive after-sales support, making us the preferred choice in the global fasteners market.

Shop a Complete Range of Precision Fasteners Including Bolts, Nuts, Studs, Screws & Washers in SS 304, 316L, Duplex, Inconel & Hastelloy – Manufactured to ASTM, DIN, ISO, and BS Standards with Options for Hot-Dip Galvanized, PTFE, Zinc & Xylan Coatings.

Fasteners Specifications

Product name Fasteners
DIN Standard B.S. DIN933 DIN931 DIN934 DIN912 DIN603 DIN6923
Standard ISO 4017, DIN931, GB5783, DIN, ASTM, ANSI, JIS, EN, AS
Surface treatment
Passivation /plain
Bolts Size M2 – M100
Nut Size M3 – M56 | 3/6″ to 2″ | Custom Sizes
Screw Size M3 – M56 | 3/6″ to 2″ | Custom Sizes
Machine Screws Size M1.6 – M12
Washers Size M3 – M56 | 3/6″ to 2″ | Custom Sizes
Length 3mm-200mm
Head Hex, Square, Round, Hex flange, Flat, T-head & Triangular etc
Drive type Phil, Slotted, Hex socket, Torx & square slot etc
Neck type Hex, Square, Triangular, Oval & Knurled etc
Standard ASTM A193, ASTM A307, ASTM A563, ASTM A160, ASTM A164, ASTM B574, ASTM B446, ASTM B861, B862, ASTM B425, ASTM B166,ASTM B472
Materials Stainless Steel, Carbon Steel, Alloy Steel, High Nickel , Titanium, Aluminium, Mild Steel, Duplex & Super Duplex
Application Wind tower, Nuclear power, Railway, Automotive industry, Construction, Electronic industry
Dimensions ASME B18.6.3 **Exception: screws 6 inches and shorter are fully threaded.
Surface treatment
  • Passivation
  • Polish
  • Anodizing
  • Sand blasting
  • Electroplating (color, blue, white, black zinc, Ni, Cr, tin, copper, silver)
  • Black oxide coating
  • Heat-disposing
  • Hot-dip galvanizing
  • Rust preventive oil
Thread Requirements ASME B1.1, UNC & UNF, Class 2A (Fastenal will inspect and accept parts with a 1A no-go gauge)
Drive Style Type I
Production technology Cold Forged
Others OEM, ODM, ±0.03MM tolerance
Finishing Zinc Plated (Yellow, White, Blue, Black), Hop Dip Galvanized (HDG) phosphorization, Black Oxide, Geomet, Dacroment, anodization, Nickel plated, Zinc-Nickel plated, Brass Plated, Tin Plated, Black Plated, Copper Plated, Gold Plated, Salt fog test
Manufacturing Process Wire Drawing, Cold Heading, Insert tapping, Heat Treatment, Surface Plating, Inspection, Packing
Coatings Black Oxide, Cadmium, Galvanized, Teflon, Xylan, Zinc, Others Upon Request
Tolerance +/-0.01mm to +/-0.05mm
Type Bolts, Nuts, Sockets, Screws, Screw, Studs, Socket Screw, Hex Set Screw, Cap Screw, Machine Screw, Pan Head Screw, Allen Cap screw, Socket Head Cap Screw, Wing Screw, Spring Washers, Washers, Studs, Marine Anchors, Anchors, Hexagon Nut, Nut, Hex Coupling Nut, Hex Nut, Square Nut, Hex Domed Cap Nuts, Hex Head Bolts, Stud Bolts, Socket Hexagon Head Screw,U- Bolts, Anchor Bolt, Mushroom Head Square Neck Bolts, J Bolts, Wing Screw, T-Head Bolts, Foundation Bolts, Eye Bolt,Structural Bolts.

Types of Steel Fasteners

Precision-machined threads, providing reliable fastening and long service life.

Nuts are essential fastening components used to secure bolts and screws in various applications.

Designed with sharp, accurate threads for easy penetration and secure fastening.

Washers distribute load and protect surfaces in fastening assemblies. Made from ss &special alloys.

Heat-treated for enhanced tensile strength and superior load-bearing performance.

Stud Bolts

Designed with full or partial threading for secure fastening in critical applications.

DIN/BS Fasteners Standards

Socket Cap screws Stud Bolts Hexagon Bolts / Set Screws Hexagon Nuts
DIN 912 BS4882 DIN 931 DIN 934
DIN 6912 DIN 976 DIN 933 BS 1768
DIN 7984 BS 1768 BS 1769
ANSI B18.3 UNI 5731 BS 1083
ISO 4762 UNI 5739 BS 3692
UNI 5931 ISO 4014 ISO 4032
BS 2470 ISO 4017 ISO 4033
BS 4168 BS 1769 ANSI B18.2.2
BS 3692
ANSI B18.2.1
Washers Socket & Slotted Countersunk Screws Socket & Slotted Set Screws Studs
DIN 125 DIN 963 DIN 913 DIN 938
DIN 9021 DIN 7991 DIN 914 DIN 939
BS 4320 BS 4168 DIN 915 DIN 2510
BS 3410 BS 1981 DIN 916 BS 4439
BS 483 DIN 551 BS 2693
Spring Washers BS 2470 DIN 553
DIN 127 DIN 438
BS 4464 BS 4168
BS 1802

DIN/ISO Fasteners Standards

No. Description
DIN 85 Slotted Pan Head Machine Screws
DIN 125A Flat Washer (without Chamfer)
DIN 84 Slotted Cheese Head Machine Screws
DIN 125B Flat Washer (with Chamfer)
DIN 94 Cotter Pin
DIN 127B Split Lock Washer
DIN 315 Wing Nut
DIN 137B Spring Wave Washer
DIN 439B Machine Screws Hex Nut, Finished Hex Jam Nut
DIN 912 Hex Socket Head Cap Screws
DIN 911 Long Arm Hex Key
DIN 916 Hex Socket Set Screws
DIN 7991 Hex Flat Socket Head Cap Screws
DIN 933 Hex Head Cap Screws Fully Threaded
DIN 931 Hex Head Cap Screws Partially Threaded
DIN 934 Finished Hex Nut
DIN 960 Hex Head Cap Screws Partially Threaded
DIN 7985 Phillips Pan Head Machine Screws
DIN 939 Double End Stud
DIN 961 Hex Head Cap Screws Fully Threaded
DIN 964 Slotted Oval Head Machine Screws
DIN 963 Slotted Flat Head Machine Screws
DIN 965 Phillips Flat Head Machine Screws
DIN 975 Threaded Rod
DIN 966 Phillips Oval Head Machine Screws
DIN 980V Hex Steel Prevailing Torque Lock Nut
DIN 6334 Rod Coupling Nut
DIN 985 Hex Nylon Insert Lock Nut
DIN 6797A External Tooth Lock Washer
DIN 6912 Hex Low Socket Head Cap Screws
DIN 6797J Internal Tooth Lock Washer
DIN 6921 Hex Flange Head Screws
ISO 7379 Hex Socket Head Shoulder Screws
DIN 6923 Hex Flange Nut
ISO 7380 Hex Button Socket Head Cap Screws

Bolt Size Chart


SizeNominal (Major)Coarse Thread (UNC)Fine Thread (UNF)
Diameter [in]Threads Per InchTensile Stress
Area [in2]
Minor Area [in2]Threads Per InchTensile Stress
Area [in2]
Minor Area [in2]
#00.06800.00180.0015
#20.086560.00370.0031640.00390.0034
#40.112400.0060.005480.00660.0057
#50.125400.0080.0067440.00830.0072
#60.138320.00910.0075400.01020.0087
#80.164320.0140.012360.01470.0129
#100.19240.01750.0145320.020.0175
1/4″0.25200.03180.0269280.03640.0326
5/16″0.3125180.05240.0454240.0580.0524
3/8″0.375160.07750.0678240.08780.0809
7/16″0.4375140.10630.0933200.11870.109
1/2″0.5130.14190.1257200.15990.1486
9/16″0.5625120.1820.162180.2030.189
5/8″0.625110.2260.202180.2560.24
3/4″0.75100.3340.302160.3730.351
7/8″0.87590.4620.419140.5090.48
1″180.6060.551120.6630.625
1-1/8″1.12570.7630.693120.8560.812
1-1/4″1.2570.9690.89121.0731.024
1-3/8″1.37561.1551.054121.3151.26
1-1/2″1.561.4051.294121.5811.521
1-3/4″1.7551.91.74
2″24.52.52.3

Nuts Size Chart

Nuts Size
(mm)
Diameter*
(mm)
Height
(mm)
Hex Nuts Jam Nuts Nylock Nuts
2 4 1.6 1.2
2.5 5 2 1.6
3 5.5 2.4 1.8 4
4 7 3.2 2.2 5
5 8 4 2.7 5
6 10 5 3.2 6
7 11 5.5 3.5
8 13 6.5 4 8
10 17 8 5 10
12 19 10 6 12
14 22 11 7 14
16 24 13 8 16
18 27 15 9 18.5
20 30 16 10 20
*This is the diameter across the flats. It is also the size of wrench to use.

Screw Sizes

THREAD DIAMETER
Size Nearest Fraction Inch Millimeter
#0 1/16 0.06 1.5
#1 5/64 0.07 1.8
#2 3/32 0.08 2.0
#3 7/64 0.09 2.3
#4 7/64 0.11 2.8
#5 1/8 0.12 3.1
#6 9/64 0.13 3.3
#8 5/32 0.16 4.2
#10 3/16 0.19 4.8
#12 7/32 0.21 5.5
#14 1/4 0.24 6.3

Size Chart for Washers

Size USS SAE
Inside Diameter
(A)
Outside Diameter
(B)
Thickness
(C)
Inside Diameter
(A)
Outside Diameter
(B)
Thickness
(C)
#2 3/32″ 1/4″ 0.020″
#4 1/8″ 5/16″ 0.032″
#6 5/32″ 3/8″ 0.049″
#8 3/16″ 7/16″ 0.049″
#10 7/32″ 1/2″ 0.049″
#12 1/4″ 9/16″ 0.065″
1/4″ 5/16″ 0.734″ 0.065″ 9/32″ 5/8″ 0.065″
5/16″ 3/8″ 7/8″ 0.083″ 11/32″ 11/16″ 0.065″
3/8″ 7/16″ 1″ 0.083″ 13/32″ 13/16″ 0.065″
7/16″ 1/2″ 1-1/4″ 0.083″ 15/32″ 15/16″ 0.065″
1/2″ 9/16″ 1-3/8″ 0.109″ 17/32″ 1-1/16″ 0.095″
9/16″ 5/8″ 1-15/32″ 0.109″ 19/32″ 1-5/32″ 0.095″
5/8″ 11/16″ 1-3/4″ 0.134″ 21/32″ 1-5/16″ 0.095″
3/4″ 13/16″ 2″ 0.148″ 13/16″ 1-15/32″ 0.134″
7/8″ 15/16″ 2-1/4″ 0.165″ 15/16″ 1-3/4″ 0.134″
1″ 1-1/16″ 2-1/2″ 0.165″ 1-1/16″ 2″ 0.134″
1-1/8″ 1-1/4″ 2-3/4″ 0.165″
1-1/4″ 1-3/8″ 3″ 0.165″
1-3/8″ 1-1/2″ 3-1/4″ 0.180″
1-1/2″ 1-5/8″ 3-1/2″ 0.180″
1-5/8″ 1-3/4″ 3-3/4″ 0.180″
1-3/4″ 1-7/8″ 4″ 0.180″
2″ 2-1/8″ 4-1/2″ 0.213″

Worldwide Supply of Fasteners

Russia, Bahrain, Cyprus, Egypt, Iran, Iraq, Israel, Jordan, Kuwait, Lebanon, Oman, Palestine, Qatar, Saudi Arabia, Syria, Turkey, United Arab Emirates (UAE), Yemen, United States of America (USA), Albania, Andorra, Austria, Belarus, Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Moldova, Monaco, Montenegro, Netherlands, North Macedonia, Norway, Poland, Portugal, Romania, San Marino, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Ukraine, United Kingdom, Vatican City.

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As an ISO 9001:2015, 14001:2004, and 18001:2007 certified company, we specialize in catering to the stringent demands of industries such as Oil & Gas, Petrochemical, Power Generation, and Nuclear Sectors.

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