Products Description
J Bolts, a non-standard fastener that combines the dual core functions of pre-embedded fixing and hoisting connection, breaks through the application limitations of traditional straight bolts with its "J"-shaped hook design. It has become a core component in connection, fixing, pre-embedding, hoisting and other scenarios, and is widely used in core fields such as industrial manufacturing, construction engineering, power energy, and transportation infrastructure.
The core factor determining the mechanical properties, corrosion resistance, and service life of J Bolts is the choice of manufacturing materials. We use high-quality virgin steel to ensure the stability of performance in every batch of products. We select appropriate materials based on the actual application scenario. Commonly used materials are divided into three main categories: carbon steel, alloy steel, and stainless steel. Their performance characteristics and applications are as follows:
Q235 Low-carbon steel:
Yield strength ≥ 235MPa, tensile strength ≥ 375MPa, excellent plasticity and toughness, suitable for light loads or general applications;
01
45# Medium-carbon steel:
Yield strength ≥ 355MPa, tensile strength ≥ 600MPa, superior hardness and strength, suitable for medium loads and medium strength applications, such as industrial equipment base fixing, small bridge embedded parts, and mechanical component connections;
02
40Cr:
Yield strength ≥ 785MPa, tensile strength ≥ 980MPa, possessing both strength and toughness, suitable for heavy-duty equipment fixing, medium-sized bridge embedded parts, and engineering machinery connections;
03
304 stainless steel:
Yield strength ≥ 205MPa, tensile strength ≥ 515MPa, suitable for food processing, pharmaceuticals, chemicals, interior and exterior decoration, etc.;
04
316 stainless steel:
Stronger corrosion resistance, precisely suited for marine engineering, port terminals, coastal construction, and strong acid environments in the chemical industry.
05
J Bolts' manufacturing process directly impacts product quality and performance. The production process includes raw material preparation, hook forming, thread processing, heat treatment, surface treatment, inspection, and packaging. The specific steps are as follows:
Raw Material Preparation:High-quality raw materials are used, and materials are cut according to design specifications. Burrs are removed from the end faces after preparation to prevent interference with subsequent processing and use.
Hook Forming:This primarily involves cold bending and hot bending. Cold bending is performed at room temperature using a pipe bending machine or folding machine, resulting in high efficiency and good surface quality. Hot bending involves heating the round steel to the processing temperature and then using specialized molds for hook forming. The advantage of hot bending is its ability to process large-diameter, high-curvature hooks without the risk of cracking.
Thread Processing:Thread processing includes turning and roll forming. Turning involves cutting the thread section using a lathe, resulting in high thread precision, suitable for small-batch and high-precision products. Roll forming involves cold rolling the threaded section using a thread rolling machine, offering high processing efficiency and suitability for mass production.
Heat treatment: The core process is quenching followed by high-temperature tempering. Quenching involves heating the bolt to above its critical temperature, holding it at that temperature, and then rapidly cooling it (oil or water cooling) to obtain a martensitic structure, improving hardness and strength. High-temperature tempering involves heating the quenched bolt to 500-650℃, holding it at that temperature, and then air cooling to eliminate quenching stress.
Surface treatment: Appropriate surface treatment processes are selected based on the actual application scenario. These processes include electro-galvanizing and hot-dip galvanizing. Electro-galvanizing uses alkaline or acidic zinc plating processes, with a zinc layer thickness controlled at 5-15μm. Passivation treatment is performed after galvanizing to improve corrosion resistance. Hot-dip galvanizing involves immersing the bolt in molten zinc, with a zinc layer thickness controlled at 65-100μm. Hot-dip galvanizing removes zinc nodules and burrs.
Hot Tags: j bolts j, China j bolts j manufacturers, suppliers, factory, weld fit up, welded hydraulic cylinder cross tube, weld line, hydraulic cylinder weld on ends, welded valves, weld flange
