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ASME B18.31.3 Threaded Rods
  • ASME B18.31.3 Threaded RodsASME B18.31.3 Threaded Rods

ASME B18.31.3 Threaded Rods

Leader-Fastener® is a ASME B18.31.3 Threaded Rods manufacturer and distributor of ASME B18.31.2 Stud Bolt. We have a complete line of service from having invested in production plants, export department and to having a quality control team and center to meet your requirements. We regard quality as the life of the company. We persist in good quality as the first policy and have established a set of quality control and inspection system according to the international standard.We have carried out ISO9001 Quality Guarantee System in every course of production, transportation and selling.We do hope we could be your partner in business by topping quality, knight service and competitive price in the near future and be your friends as well.

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Product Description

This Standard covers the complete dimensional and general data for continuous thread, flange studs (stud bolts), and double-end inch-dimensioned studs. The following configurations are covered:

Continuous thread stud: studs that are threaded over their complete length.

Leader-Fastener® Flange stud (stud bolt): threaded studs used primarily in applications with flanges covered by ASME B16.5, and made using ASTM A01 bolting materials.

Double-end stud (clamping type—identical ends): studs with screw threads of the same length and configuration on each end. This type of stud serves the function of clamping two bodies together with a nut on each end.

Double-end stud (tap end type): a stud designed to be installed in a tapped hole and usually with different threaded lengths on each end. For the tap end of the studs, both regular unified threads and interference-fit threads are covered.

Double-end studs of the following body diameters are covered:

(a) Reduced diameter body

(b) Full body


Leader-Fastener® ASME B18.31.3 Threaded Rods


Nominal Size Diameter, D Threads Per Inch Umax= 2 Thread Pitches = 2P
UNC UNF 8UN UNC Threads UNF Threads 8UN Threads
1/4 0.2500 20 28 - 0.100 0.071 -
5/16 0.3125 18 24 - 0.111 0.083 -
3/8 0.3750 16 24 - 0.125 0.083 -
7/16 0.4375 14 20 - 0.143 0.100 -
1/2 0.5000 13 20 - 0.154 0.100 -
9/16 0.5625 12 18 - 0.167 0.111 -
5/8 0.6250 11 18 - 0.182 0.111 -
3/4 0.7500 10 16 - 0.200 0.125 -
7/8 0.8750 9 14 - 0.222 0.143 -
1 1.0000 8 12 - 0.250 0.167 -
1-1/8 1.1250 7 12 8 0.286 0.167 0.25
1-1/4 1.2500 7 12 8 0.286 0.167 0.25
1-3/8 1.3750 6 12 8 0.333 0.167 0.25
1-1/2 1.5000 6 12 8 0.333 0.167 0.25
1-5/8 1.6250 - - 8 - - 0.25
1-3/4 1.7500 5 - 8 0.400 - 0.25
1-7/8 1.8750 - - 8 - - 0.25
2 2.0000 4-1/2 - 8 0.444 -- 0.25
2-1/4 2.2500 4-1/2 - 8 0.444 - 0.25
2-1/2 2.5000 4 - 8 0.500 - 0.25
2-3/4 2.7500 4 - 8 0.500 - 0.25
3 3.0000 4 - 8 0.500 - 0.25
3-1/4 3.2500 4 - 8 0.500 - 0.25
3-1/2 3.5000 4 - 8 0.500 - 0.25
3-3/4 3.7500 4 - 8 0.500 - 0.25
4 4.0000 4 - 8 0.500 - 0.25




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