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.

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.

- 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
- sales@insha.vn
- 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.