Pipe outer diameter Da (mm)	Bending radius R (mm)	Thread specification d	Total length (mm)	U-shaped opening width a (mm)	Leg spacing b (mm)	Threaded section length m (mm)
14	8	M6	98	33	22	22
18	10	M10	108	35	26	-
22	12	M10	135	42	28	34
25	14	M10	143	44	38	-
33	18	M10	160	48	46	-
38	20	M12	192	55	32	52
42	22	M12	202	57	56	-
45	24	M12	210	59	60	-
48	25	M12	220	60	62	-
51	27	M12	225	62	66	-
57	31	M12	240	66	74	-
60	32	M12	250	67	76	-
76	40	M12	289	75	92	-
83	43	M12	310	78	98	-
89	46	M12	325	81	104	-
102	53	M16	365	93	38	122
108	56	M16	390	96	-	-
114	59	M16	405	99	-	-
133	69	M16	450	108	-	-
140	72	M16	470	112	-	-
159	82	M16	520	122	-	-
165	85	M16	538	125	-	-
219	112	M16	680	152	-

Application Categories	Specific Application Scenarios	Main Functions and Advantages
Infrastructure and Construction	Building pipe installation, ventilation and fire protection piping, steel structure connections, cantilevered scaffolding embedded parts	For fixing water pipes, cable conduits, air ducts, etc.; provides stable connections, and the hot-dip galvanized layer resists moisture corrosion in the building environment.
Transportation and Industry	Automotive chassis (fixed leaf springs), marine equipment, rail vehicle components	Withstands vibration and impact; hot-dip galvanizing treatment provides resistance to harsh environments such as road salt spray and high humidity at sea.
Power and Municipal Engineering	Power poles and towers, power line pole clamps, bridge and tunnel facilities, municipal sewage pipelines	These components are permanently exposed to the elements, requiring extremely high weather resistance. The thick hot-dip galvanized coating provides long-lasting corrosion protection for 10-15 years or more.
Other Mechanical Fastening	Securing tubular and sheet metal components of large equipment, and mechanical hydraulic system pipelines.	Utilizes a U-shaped structure for clamping and securing, offering easy installation and removal, and is suitable for various non-standard applications.

Why is Hot Dip Galvanizing U bolts Crucial ?

hdg u bolt is the core reason for its widespread application in the scenarios mentioned above. The main differences between it and ordinary electro-galvanizing are: Process and Coating: The bolts are immersed in molten zinc, forming a firmly adhering, relatively thick (usually tens of micrometers or more) zinc-iron alloy layer, providing a dual anti-corrosion mechanism of both physical barrier and cathodic protection. Performance Comparison: Its corrosion resistance is far superior to ordinary electro-galvanizing or black oxide treatment, making it particularly suitable for outdoor, humid, coastal, or industrial environments. Under standard conditions, its service life can reach 10-15 years or even longer.