来源： 最后更新时间：2025-02-11 14:11:23 人气：108400

Positive and negative thread connection sleeve is a type of steel bar straight thread sleeve. The positive and negative thread type sleeve is suitable for connecting steel bars in non rotating areas such as bent iron steel cages.

Schematic diagram of positive and negative wire sleeve connection

How to distinguish between positive and negative thread sleeves: You can hold the threaded connection sleeve with your right hand. If the helix angle of the thread is facing the thumb direction, it is a positive thread; If it is the opposite, it is a reverse thread. This way, everyone can easily distinguish between them. That is to say, the buckle can be rotated clockwise to move in and counterclockwise to move out. Reverse buckle: It can be rotated in and out when rotated counterclockwise. Alternatively, it can be identified by the sleeve steel seal: the one marked with BF4 is the positive and negative wire sleeve, and BB4 is the positive wire sleeve.

During the construction process, when the supporting beams, wall columns, and transfer layers are finished, and a steel bar has been fixed by concrete, and the tail of the movable steel bar is twisted and cannot rotate 360 degrees, a forward and backward (bi-directional) sleeve should be used. First, screw the sleeve into the positive end of the steel bar thread head with 2-3 threads, then align the steel bar to be connected with the reverse end of the sleeve, and retract the rotating sleeve by 1-2 threads. At this time, both sides of the steel bar are screwed into 1-2 threads, and then use a steel bar wrench to rotate the sleeve to complete the installation.

The specific connection method of the positive and negative wire connection sleeve is as follows:

1、 Move the two connected steel bars to the two ends of the connecting sleeve, and rotate the connecting sleeve to smoothly screw the two steel bars into the connecting sleeve;

2、 When the steel wire head is screwed into half of the connecting sleeve, observe the number of exposed threads on both ends of the connecting sleeve that have not been screwed into the steel wire head.

3、 After confirming that there are exposed threads on both ends of the connecting sleeve and the quantity is equal, use a special work wrench or pipe wrench to rotate the connecting sleeve, so that the steel wire heads of the two connected steel bars are locked against each other in the middle of the connecting sleeve.

规格	外径	长度	内孔	牙型角	螺距
12MM	19	35	11	75	2.5
14MM	21	35	11.7	75	2.5
16MM	24	40	14.7	75	2.5
18MM	27	45	16.5	75	2.5
20MM	30	50	18.5	75	2.5
22MM	32.5	55	20.5	75	2.5
25MM	37	60	23.5	75	3
28MM	41	65	26.5	75	3
32MM	47	75	30.3	75	3
36MM	53	85	34.5	75	3
40MM	58	90	37.5	75	3
National standard size parameters, with steel stamp by default. If you need other sizes, please contact us for clarification. Size unit: mm

If the customer does not provide a definite type and specification of the sleeve, the customer should correctly explain their type, specification, and requirements, and sign the contract under the condition of mutual understanding between the supply and demand parties。

　1、The customer communicated the product type, specifications, and dimensions to our salesperson。

　2、Received customer specifications and dimensions, provided sleeve quotation (price list) for the customer。

　3、Specific agreement: delivery time, special requirements, and other matters。

　4、After placing the order and making payment, our company will arrange shipment as soon as possible。

Steel bar straight threaded sleeves are commonly used in construction projects such as engineering, road construction, bridges, subways, tunnels, and power stations. It can be widely used in reinforced concrete structural engineering in various industrial and civil buildings. Suitable for the same or different diameter connection of HRB335 and HRB400 grade steel bars with a diameter of 16 to 40mm in beams, slabs, columns, and foundations in any part and direction, and can also be used as pre embedded joints for steel bars.

The advantages of the new steel bar connection sleeve are as follows:

1. Not affected by the chemical composition of steel bars, human factors, climate, electricity, and many other factors;

2. No pollution, in compliance with environmental protection requirements, safe and reliable construction without open flame operation;

3. Widely applicable, suitable for connecting steel bars in various directions and with the same or different diameters;

4. High strength, stable and reliable quality;

5. Easy operation and fast construction speed.

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