Skip to content

Stud bolts built to the standard, not to the price

INSHA manufactures stud bolts, threaded rods and heavy hex nuts to ASTM, ASME, DIN and ISO standards for the oil and gas, petrochemical and power industries. Every batch ships with an EN 10204 3.1 mill test certificate.

Manufacturing hall
Interior of a heavy engineering workshop with overhead cranes

26+

Years manufacturing

Producing bolting for pressure equipment since 2000

M12–M100

Diameter range

Imperial 1/2" to 4" on the same lines

6,000 mm

Maximum stud length

Single-piece threaded rod, no welded joints

100%

Batches with 3.1 certificate

EN 10204 3.1 issued from our own test lab

01 / How we work

A narrow catalogue, deliberately

INSHA makes one family of parts: bolting for flanged joints. Stud bolts, threaded rod, heavy hex nuts and the washers that go with them. We do not make screws, rivets or sheet metal fasteners, and we are not trying to.

The reason is the certificate. A plant that runs twenty product families cannot keep a heat number attached to every part through cutting, heat treatment, threading, coating and packing. A plant that runs one family can, and that traceability is the whole product.

It also means we can answer a technical question without checking with anyone. If you ask whether B8M Class 2 is available above 1½ inch, you get the answer in the same email, not after a week of internal enquiry.

Material store
Steel bar stock stacked on racks in the material store
Thread rolling
Two-roll machines, rolled after heat treatment up to M64 — see the machine list
Heat treatment
In-house quench and temper, furnace charts recorded per batch
Machining
CNC turning, chamfering and thread cutting to M100
Coating
PTFE/Xylan and zinc in-house; hot dip galvanizing through qualified partners
Testing
Tensile, hardness, Charpy impact, PMI and thread gauging in our own lab
Traceability
Heat number stamped on every stud and printed on the certificate

02 / Contact

How to reach us

Contact
Ho Chi Minh City, Vietnam
Phone / WhatsApp
+84 943 881 133

Need a quotation?

Send us the grade, size and quantity. We reply within one working day with price, lead time and the certificate package included.