About Longze Engineering
A precision fastener manufacturer and export supplier working to DIN, ISO and ASME standards.
Who we are
Longze Engineering is the export-facing brand of Hebei Longze Metal Products Manufacturing Co., LTD, a fastener manufacturer based in Handan, Hebei Province, China. We manufacture hex bolts, socket head cap screws, nuts and washers, and publish the underlying standard data — dimensions, materials, property classes and surface finishes — so that buyers can specify and verify every part.
Company details
| Legal entity | Hebei Longze Metal Products Manufacturing Co., LTD |
|---|---|
| Address | Jili Mall, Linmingguan Town, Yongnian District, Handan City, Hebei Province, China |
| eric@lzfasteners.com | |
| Phone | +86-15350500528 |
| Business | OEM / ODM fastener manufacturing and export |
What we manufacture
- Hex bolts — DIN 931 (part thread), DIN 933 (full thread), ISO 4014, ISO 4017
- Socket head cap screws — DIN 912, ISO 4762, ASME B18.3
- Nuts — DIN 934, ISO 4032
- Washers — DIN 125-A, DIN 127-A, DIN 7980, ISO 7089
Size range and grades
Metric sizes from M1.6 to M64. Property classes 8.8, 10.9 and 12.9; stainless steel grades A2-70 and A4-80; washer hardness grades 100HV to 300HV.
Surface finishes
Zinc plating, hot-dip galvanizing (HDG), Dacromet, zinc flake and passivation. Coating thickness and salt-spray test data are published per standard so that finish selection can be made against a specification rather than a claim.
How we document standards
Every standard in our standards library is documented with its dimensional data, size matrix, material and finish options, and equivalence mapping to related DIN / ISO / ASME standards. Our engineering center covers equivalence clusters and specification detail.
Standards bodies
Our work references the published standards of the following bodies: DIN (Deutsches Institut fuer Normung), ISO (International Organization for Standardization), and ANSI / ASME B18 series.
Contact
For quotations, send the standard, size, property class, surface finish and quantity to eric@lzfasteners.com. We reply with FOB pricing and lead time.