Top 5 Types of Threaded Rod

Top 5 Types of Threaded Rod

Threaded Rod are the type of fasteners and also known as threaded bars. These solid rods are manufactured from round bars and billets. There are Top 5 Types of Threaded Rod used in Petrochemical, Construction and Oil and Gas Industries. These rods comes in Acme, Metric, NPT, BSF ad NPTF threads.

Table of contents

Fully Threaded Rod in Metric and Imperial Sizes

Threaded Bar Specification

Thread Standards ISO 724, ISO 268, ISO 68-1, ASME B1.13M, ASME B1.1, BS 3643,BS 84
Inch Sizes ¼” to 8″
Metric Sizes M6 – M152
Imperial Threads BSW, ASME, BSF
Metric Threads ASME, ISO

Thickness of DIN975 Fully Threaded Rod

Identifying Min Thickness, in (Inches.)
5 0.0002
12 0.0005
8 0.0003
3 00.0001

Threaded Rod Weight Chart As Per DIN 975

Size Weight in (kg)
M18 1650
M48 12400
M2 18.7
M45 11000
M2.5 30.0
M42 9400
M3 44.0
M39 8200
M3.5 60.0
M14 970
M36 6900
M4 78.0
M20 2080
M33 5900
M16 1330
M5 124
M30 4750
M6 177
M27 3850
M8 319
M24 3000
M10 500
M22 2540
M12 725

Threaded Rod Size Chart

Threaded Rod Size Chart

Thread Size Tapping Drill Size Thread Pitch in (MM) Major Dia
M8 6.8 1.25 8
M20 17.5 2.5 20
M6 5 1 6
M3 2.5 0.5 3
M16 14 2 16
M4 3.3 0.7 4
M12 10.2 1.75 12
M5 4.2 0.8 5
M10 8.5 1.5 10

High Tensile Threaded Rod as Per ASME B18.31.3 and B18.31.4M Standard

Standards of Threaded Rod

DIN UNI ASME ISO
Metric Imperial
975 — B18.31.4M B18.31.3 —

DIN 975 Threaded Rod in Half and Full Threads

Types of Threaded Rod

Fully Threaded Rod

Fully Threaded Rod

Half Threaded Rod

Half Threaded Rod

UNC Threaded Rod

UNC Threaded Rod

ACME Threaded Rod

ACME Threaded Rod

Metric Threaded Rod

Metric Threaded Rod

Galvanized Threaded Rod

Fully Threaded Rod

Long Threaded Rod

Long Threaded Rod

High Tensile Threaded Rod

High Tensile Threaded Rod

8mm Threaded Rod

8mm Threaded Rod

Half Threaded Rod Available Diameter

Diameter Pitch in (MM) Diameter in (MM)
M18 2.50 18.0
M42 4.50 42.0
M6 1.00 6.0
M36 4.00 36.0
M8 1.25 8.0
M30 3.50 30.0
M10 1.50 10.0
M24 3.00 24.0
M12 1.75 12.0
M20 3.00 20.0
M16 2.00 16.0

Galvanized Threaded Rod in ASTM A36, A449 and A307 American Specification

Grades of Top 5 Types of Threaded Rod

Grades Grade Marking Nominal Size
ASTM A307 Grade A
    Grade A

  • Grade A
  • Size : 1⁄4″ – 4″
ASTM A307 Grade B
    Grade B

  • Grade B
  • Size : 1⁄4″ – 4″
ASTM F1554 Grades 36, 55, and 105
    Grades 36

  • Grades 36
  • Size : 1⁄4″ – 4″
    Grades 55

  • Grades 55
  • Size : 1⁄4″ – 2″
    Grades 105

  • Grades 105
  • Size : 1⁄4″ – 3″
ASTM A449
    ASTM A449

  • ASTM A449
  • Size : 1⁄4″ – 1″
ASTM A193 Grade B7
    Grade B7

  • Grade B7
  • Size : 1⁄4″ – 21⁄2″
ASTM A320 Grade L7
    Grade L7

  • Grade L7
  • Size : 1⁄4″ – 21⁄2″
ASTM A354 Grade BC
    Grade BC

  • Grade BC
  • Size : 1⁄4″ – 21⁄2″
ASTM A354 Grade BD
    Grade BD

  • Grade BD
  • Size : 1⁄4″ – 21⁄2″
SAE J429 Grades 2, 5, and 8
    Grade 2

  • Grade 2
  • Size : 1⁄4″ – 11⁄2″
    Grade 5

  • Grade 5
  • Size : 1⁄4″ – 3⁄4″
    Grade 8

  • Grade 8
  • Size : 1⁄4″ – 11⁄2″
Stainless Steel
    Grade B8 Class 1

  • Grade B8 Class 1
  • Size : All
    Grade B8M Class 1

  • Grade B8M Class 1
  • Size : All
    Grade B8 Class 2

  • Grade B8 Class 2
  • Size : Up to 3/4
    Grade B8M Class 2

  • Grade B8M Class 2
  • Size : Up to 3/4

Threaded Bar Color Code AS Per ISO Standard

Property Color Code
10.9 Class (1000 N/mm2, 900 N/mm2) White
A2 SSl (304) Green
4.8 Class (Tensile Strength 400 N/mm2, Yield Strength 240 N/mm2) Unmarked
A4 SS (316) Red
8.8 Class (800 N/mm2, 640 N/mm2) Yellow

Long Threaded Rod in UNC, UNF and 8UN Thread

UNC Threaded Rod Standard Sizes

Coarse Thread Series – Unified National Coarse (UNC) Fine Thread Series – Unified National Fine (UNF)
Threads Per In. and Nominal Size. Tensile Stress Area Minor Dia Section. Basic Pitch Dia. Threads Per In. and Nominal Size. Tensile Stress Area Minor Dia Section. Basic Pitch Dia.
(Sq in.) (Sq in.) (Inches.) (Sq in.) (Sq in.) (Inches.)
11⁄4 – 7 0.969 0.890 1.1572 11⁄4 – 12 1.073 1.024 1.1959
4 – 4 11.08 10.61 3.8376 — — — — —
3⁄8 – 16 0.0775 0.0678 0.3344 3⁄8 – 24 0.0878 0.0809 0.3479
33⁄4 – 4 9.66 9.21 3.5876 — — — — —
7⁄16 – 14 0.1063 0.0933 0.3911 7⁄16 – 20 0.1187 0.1090 0.4050
31⁄2 – 4 8.33 7.92 3.3376 — — — — —
1⁄2 – 13 0.1419 0.1257 0.4500 1⁄2 – 20 0.1599 0.1486 0.4675
31⁄4 – 4 7.10 6.72 3.0876 — — — — —
9⁄16 – 12 0.182 0.162 0.5084 9⁄16 – 18 0.203 0.189 0.5264
3 – 4 5.97 5.62 2.8376 — — — — —
5⁄8 – 11 0.226 0.202 0.5660 5⁄8 – 18 0.256 0.240 0.5889
11⁄8 – 7 0.763 0.693 1.0322 11⁄8 – 12 0.856 0.812 1.0709
23⁄4 – 4 4.93 4.62 2.5876 —    — — — —
3⁄4 – 10 0.334 0.302 0.6850 3⁄4 – 16 0.373 0.351 0.7094
21⁄2 – 4 4.00 3.72 2.3376 —    — — — —
7⁄8 – 9 0.462 0.419 0.8028 7⁄8 – 14 0.509 0.480 0.8286
21⁄4 – 41⁄2 3.25 3.02 2.1057 —    — — — —
1 – 8 0.606 0.551 0.9188 1 – 12 0.663 0.625 0.9459
13⁄4 – 5 1.90 1.74 1.6201 —    — — — —
2 – 41⁄2 2.50 2.30 1.8557 —    — — — —
11⁄2 – 6 1.405 1.294 1.3917 11⁄2 – 12 1.581 1.521 1.4459
13⁄8 – 6 1.155 1.054 1.2667 13⁄8 – 12 1.315 1.260 1.3209

Right Hand and Left Hand Threaded Rod Size

Left and Right Hand Threaded Rod

Thread Size Lg ft Lg Right Hand Left Hand
1/2″-10 3 3 ft 17″ 17″
3/8″-12 3 3 ft 17″ 17″
3/4″-6 3 3 ft 16 1/2″ 16 1/2″
5/8″-8 3 3 ft 16 1/2″ 16 1/2″

Application of Threaded Rods

Application of Threaded Rods

Features & Benefits of Fully Threaded Rod

  • Standard Lengths
  • Durable Construction
  • Versatile Use
  • Affordability
  • Wide Availability
  • Multiple Sizes

Thread Direction of Threaded Bar

Thread Direction of Threaded Bar

ASTM A193 Threaded Rod Chemical Composition

Element B8M (AISI 316) B8 (AISI 304) B7 (AISI 4140)
Sulfur, (Max) 0.030% 0.030% 0.040%
Molybdenum 2.00 – 3.00% 0.15 – 0.25%
Carbon 0.08% (Max) 0.08% (Max) 0.38 – 0.48%
Nickel 10.0 – 14.0% 8.0 – 11.0%
Manganese 2.00% (Max) 2.00% (Max) 0.75 – 1.00%
Chromium 16.0 – 18.0% 18.0 – 20.0% 0.80 – 1.10%
Phosphorus, (Max) 0.045% 0.045% 0.035%
Silicon 1.00% (Max) 1.00% (Max) 0.15 – 0.35%

Mechanical Properties of ASTM A193 Threaded Rods

Grade Elongation, in %, min Tensile Strength in ksi, min Yield Strength, in ksi, min Rockwell
B7 18 100 75 35 HRC max
16 115 95
16 125 105
B8M Class 1 30 75 30 96 HRB max
B8 Class 1 30 75 30 96 HRB max
B8 Class 2 12 125 100 35 HRC max
15 115 80
20 105 65
28 100 50
B8M Class 2 20 100 80 35 HRC max
30 90 50
25 95 65
15 110 95

Cutting Tools Types for Threaded Rod

Threaded Rod Cutting

  • Band Saw
  • Hacksaw
  • Reciprocating Saw
  • Angle Grinder

Threaded Rod Load Capacity

Nominal Rod Dia in
(Inches)		 Root Area of Thread in
(Inches2) 		Max Load 1)
kg lb
1 3/4 1.74 6670 14700
5 17.2 154000
1 1/2 1.29 5260 11600
3/8 0.07 270 600
1 1/4 0.89 3630 8000
4 1/2 13.7 123000
1/2 0.13 500 1100
4 10.6 95400
2 1/4 3.02 12340 27200
5/8 0.20 820 1800
2 1/2 3.72 15200 33500
3/4 0.30 1220 2700
2 2.30 9390 20700
3 1/2 7.92 32340 71300
7/8 0.42 1720 3800
3 1/4 6.72 27440 60500
1 0.55 2220 4900
3 5.62 22960 50600
1 1/8 0.69 2810 6200

Threaded Rod HSN Code

Property HSN Code
Threaded Rod 73181500

Types of Threaded Rod Coating

  • Zinc Plating
  • Galvanizing
  • zinc-aluminum
  • Mechanical Galvanizing
  • Black Oxide Coating
  • Powder Coating