Hot forged bolts, made in Korea since 1990
From standard hex bolts to custom parts made from a single drawing — up to Ø100mm × 1,000mm, over 1,500 products.
Get a QuoteManufacturing range
Sizes outside the catalog, orders blocked by minimum quantities, special materials — we review feasibility drawing by drawing, against the range below.
- Thread size
- M6 – M100 Inch 1/4" – 4"
- Max. size
- Ø100 × 1,000mm Diameter × length
- Materials
- Carbon & alloy steel S20C · SCM440 · Stainless · Super Duplex
- Min. quantity
- Per item Prototypes and small lots reviewed
Our Products
From M6 to M100 — KS, JIS, ANSI and ASTM standard parts plus custom parts based on your drawings.
Hex Bolt / Heavy Hex BoltHex Bolt / Heavy Hex Bolt
- Size
- M6 ~ M100 (1/4" ~ 4")
- Standard
- KS B 1002
- Material
- S20C, S45C, 51B20, SCM440, SU…
Hexagon Socket Head Cap ScrewHexagon Socket Head Cap Screw
- Size
- M5 ~ M52 (1/4" ~ 4")
- Standard
- KS B 1003
- Material
- SCM440, SNCM5, SNCM8, SUS304
Square Head BoltSquare Head Bolt
- Size
- M16 ~ M100
- Standard
- To customer specification
- Material
- S20C, S45C, 51B20, SCM440, SU…
Pin BoltPin Bolt
- Size
- M16 ~ M100
- Standard
- To customer drawing
- Material
- SCM440
Stud BoltStud Bolt
- Size
- Made to plant specification
- Standard
- ASTM A193 (B7/B7M/B16)
- Material
- Cr-Mo alloy steel (AISI 4140/…
Hex / Jam / Heavy Hex NutHex / Jam / Heavy Hex Nut
- Size
- M6 ~ M120 (1/4" ~ 4")
- Standard
- KS B 1012
- Material
- S20C, S45C and equivalents
Special & CustomSpecial & Custom Bolts
Liner bolts, wrench bolts and other non-standard shapes made from a single drawing. Stainless, Super Duplex and Inconel available.
Send us your drawingThe bigger the bolt,
the more they call us
Hot forging since 1990. Our equipment, people and processes are all built around large bolts.
VIEW MORE
- SizeIndustry-leading
working rangeForging up to Ø100mm (4") in diameter and 1,000mm (40") in length — one of the few makers in Korea covering this range.
Equipment - VarietyMulti-product,
small-lotA track record of over 1,500 products. Small-lot and non-standard orders are our specialty, not an exception.
All products - MaterialSpecial
materialsStainless, Super Duplex (S32750), Inconel and other special alloys for seawater, high-temperature and high-pressure service.
Custom work - SpeedCoordinated process,
clearer lead timeForging, machining, heat treatment and inspection are coordinated in-house, so we can review the schedule and give you a clearer lead-time estimate.
Process flow
Hot forging, step by step
Every step from raw-material check to final inspection is controlled and recorded. Control criteria and inspection records are described on the quality page.
Where our bolts work
- 01
Waterworks
Bolts and nuts for pipelines and valves
- 02
Heavy Machinery
High-strength pin bolts for excavator tracks and teeth
- 03
Construction · Plant
Structural bolt sets and stud bolts for flanges
- 04
Wind · Renewables
Large anchor bolts for towers and foundations
- 05
Cement
Liner bolts for kilns and mills
- 06
Shipbuilding
Special bolts for engines and deck equipment
Certified quality
ISO 9001 certified since 1995, ISO 14001 since 2016 — quality and environmental management. Certificate scans are published in full.
- ISO 9001Quality management system
- ISO 14001Environmental management system
- KS B 1002Hex bolt product certification
- Root Technology SpecialistKorea National Ppuri Industry Center
- In-house R&D InstituteKorea Industrial Technology Association
- Inno-Biz · Main-BizInnovation-certified SME
- Materials · Parts · EquipmentGovernment-designated specialist
- Patent No. 10-2593713Bolt assembly machine
Supply fields
Looking for a supplier for
non-standard or oversized bolts?
Start with a drawing, a photo or a physical sample. Our engineering and production staff review the drawing and service conditions, then tell you what we can make and under which limits.
Ask if we can make itReceived within 1 business day · first review sent backDrawings and specifications you send are used for review only and are never shared with third parties.