Description

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Product Parameters

The 1204 nut is a high-precision component of the SFU1204 ball screw assembly, designed to convert rotary motion into accurate linear motion. The "1204" indicates a 12 mm screw diameter with a 4 mm lead, widely used in CNC machines, automation systems, and 3D printers.

The SFU1204 nut ensures smooth, stable, and efficient movement. Made from GCr15 steel or SCM415H, hardened to HRC 58–64, it offers excellent wear resistance, durability, and long service life. When paired with the SFU1204 ball screw or other 1204 ball screw models, it delivers superior positioning accuracy and minimal backlash, even under high-speed and high-load conditions.

DLY's SFU1204 nut undergoes strict inspection for preload torque, internal clearance, and dimensional accuracy before shipment, ensuring reliable performance and consistent quality for all industrial applications.

1204 Nut Transformed Grade Ball Screw

product-348-126

Figure 2. 3 1 screw diagram

Table 2.3.1 Comparison Table of Standard Dimensions and Specifications of Transformed Stock Screw 6 to 12 Units: mm

Model			lead accuracy, etc. Level	Thread direction R: Right L: Left	Number of teeth	Standard type Screw coding	Applicable nut Type	conversion screw Longest length
outer diameter d	lead I	bead diameter Da	lead accuracy, etc. Level	Thread direction R: Right L: Left	Number of teeth	Standard type Screw coding	Applicable nut Type	conversion screw Longest length
6	1	0.8	C10,C7	R	1	SCR00601	K	1000
8	1	0.8	C10,C7	R	1	SCR00801	K	1000
	2	1.2	C10,C7	R	1	SCR00802	K
	2.5	1.2	C10,C7	R	1	SCR0082.5	K,BSH
10	2	1.2	C10,C7	R	1	SCR01002	K,BSH	3000
10	4	2	C10,C7	R	1	SCR01004	K,BSH	3000
12	2	1.2	C10,C7	R	1	SCR01202	K	4000
	4	2.5	C10,C7	R	1	SCR01204	U,BSH
	5	2.5	C10,C7	R	1	SSR01205	V, U, BSH,H,A
	10	2.5	C10,C7	R	1	SCR01210-B	V
	20	2.5	C10,C7	R	4	SCR01220	Y

Ball screw pair specification table

Specification table for ball screw set

1. Type (TYPE):SFU(DIN 69051 Formolu B)

Specification-table-for-ball-screw-set

Unit (U nit ): m m

I: Lead Da: Ball Dia.N: Number of bead turns K: Rigid Circuite Stiffness(Kgf/ μm)

Basic Dynamic Static Rating Load(Kgf)

Model

Type

RReference Data Dimensions Of Ball Screw And Nut

Coa

SFU1204-3

2.381

24/22

4.5

593

1129

12.5

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Product Features and Applications

The price of 1204 nuts is usually affected by the following factors:

Brand: Well-known brands usually have higher standards in production technology, quality control and material selection, and the accuracy, reliability and service life of the products are more guaranteed, so the price will be relatively high.
Accuracy grade: The higher the accuracy grade of the nut, the more expensive the price.
Material: The quality and performance of the nut material have an important impact on its price.
Specifications and dimensions: The larger the size of the nut, the more materials required, the greater the difficulty of processing, and the price will increase accordingly.
Surface treatment: nuts with special surface treatment, such as hard chrome plating, blackening treatment, etc., can not only improve the corrosion resistance and wear resistance of the nut, but also improve its appearance quality, which will increase the production cost and increase the price.
Market supply and demand: When the demand for 1204 nuts in the market is greater than the supply, the price tends to rise; conversely, when the supply is greater than the demand, the price may fall.

structure characteristics

Materials and workmanship

Material: 20CrMo is mostly used. After quenching, the surface hardness reaches HRC 60-64. The core maintains toughness and balances wear resistance and impact resistance.

Processing technology

Rolling process: economical mass production scheme, precision grade C7 (lead error ≤ 0.05mm/300mm), low cost.

Grinding process: high precision scheme (such as P3/P4 grade), lead error ≤ 0.021mm/300mm, suitable for precision equipment.

Cycle mode

Internal circulation: The ball always contacts the screw, only one turn per row, compact structure, suitable for high-speed light load (such as semiconductor equipment).

External circulation: the ball is temporarily separated from the screw, each row contains 1.5 to 3.5 turns, with strong bearing capacity, and is mostly used in heavy-duty scenes such as machine tools.

Typical Application Areas

1. High-precision machine tools and automation equipment

① CNC machine tools/machining center: as the core of the feed system, to achieve precision positioning of the worktable (error ≤ 0.02mm).

② Laser cutting machine/wire cutting machine: lead 4mm balance speed and accuracy, suitable for medium speed cutting scenarios.

2. Special environmental equipment

① Semiconductor manufacturing: clean room compatible version (surface low volatility treatment), used for lithography wafer table positioning.

② Spacecraft structure: withstand extreme temperature difference and vibration in space, used for instrument fastening (example: Cassini Saturn probe).

3. Industrial general equipment

① Handling robot: The outer circulation nut bears ≥ 6000N dynamic load, which is suitable for repeated handling tasks.

② Food/medical machinery: passed the microbial residue test and met the hygiene standards.

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Product Details

1204 nut production process

Raw Materials-Rough Turning-Finish Turning-Drilling And Milling of H Surface- Tapping Of Small Holes-Finish Turning-Quenching-Cylindrical Grinding-Raceway Grinding-Assembly

Series

SFU: Ordinary round hole, waist shape is divided into 2 kinds, SFY, SFA,SFE,SFS,SFH,DFU double nut, SCM( non -standard)
Fine car
End face of finish car flange-chamfer R1 -outer circle of finish car flange-dust ring of finish car
Overall length dimension L +0.05
Flange thickness dimension B +0.05
External circle of flange ± 0.05
Small hole tapping
SFU1204 ~ SFU3210 5. M6 bit oil hole 2Z
SFU4005 ~ SFU8020 6.8 drill bit oil hole M8
H-plane drilling and milling
cylindrical grinding

Model	Outer circle of nut	Tolerance
SFU1204-3	24/22	-0.009 ~-0.019

Product Supporting Evidence

Material quality

Material selection: high-quality 1204 nuts are usually made of high-strength alloy steel or stainless steel. These materials have good wear resistance, corrosion resistance and fatigue resistance, can withstand large loads, and ensure that there will be no deformation, fracture and other problems during long-term use. For example, in some harsh working environments, such as humidity, acid-base corrosion and other scenarios, stainless steel 1204 nuts can better resist corrosion and maintain their stable performance.

Material purity: The purity of the material is also critical to the quality of the nut. The high purity material has less impurity content and uniform structure, which can improve the strength and toughness of the nut. Some high-quality 1204 nuts will undergo strict screening and testing of materials during the production process to ensure that the purity of the materials meets the standard requirements.

Machining accuracy

Dimensional accuracy of the 1204 nut directly affects its matching accuracy with the ball screw. High-precision nuts in diameter, lead, thread profile and other dimensions of the error control in a very small range. For example, the diameter tolerance may be controlled within ± 0.01mm, and the lead accuracy can reach ± 0.05mm/300mm, which can ensure that the gap between the nut and the screw is uniform, the transmission is stable, and the high-precision linear motion is realized.

Form and position tolerance: the form and position tolerance of the nut, such as cylindricity, verticality, parallelism and other indicators also need to be strictly controlled. Good shape and position tolerance can ensure that the nut will not be skewed or stuck during the movement, and improve the transmission efficiency and stability. For example, the cylindricity error of the nut is controlled within 0.005mm, which can ensure that it fits closely and evenly with the lead screw.

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Surface quality

①Surface roughness: The surface roughness of the 1204 nut will affect the friction coefficient and contact accuracy between the ball and the screw raceway. The surface of the high-quality nut is finely processed, and the surface roughness value is low, usually up to Ra0.3μm. Such a surface can reduce the wear between the ball and the nut, reduce friction, and improve transmission efficiency. At the same time, it is also conducive to the even distribution of lubricating oil, further reducing friction and wear.

②Surface hardness: The surface hardness of the nut needs to meet certain requirements to improve its wear resistance and anti-seizure ability. Generally, the surface hardness is improved by heat treatment and other processes. For 1204 nuts made of alloy steel, the surface hardness can usually reach HRC60-HRC64. Suitable surface hardness can ensure that the surface of the nut will not be worn or peeled off under long-term load and frequent movement, and the service life will be prolonged.

2.Assembly quality

①Ball assembly: In the 1204 nut, the assembly quality of the ball directly affects its transmission performance. High-quality nuts in the ball assembly process, will strictly control the number of balls, diameter tolerance and assembly clearance. The diameter tolerance of the ball is controlled within a very small range, such as ± 0.01mm, and the number of balls in each nut is accurate, and the assembly gap is uniform and appropriate, which can ensure that the balls roll evenly between the nut and the screw, and the force is balanced. Improve transmission accuracy and carrying capacity.

②Sealed assembly: The sealed assembly of the nut is also very important. A good seal can prevent dust, impurities, etc. from entering the nut and affecting the rolling of the ball and the performance of the nut. High-quality 1204 nuts usually use high-quality sealing rings or gaskets, and are precisely assembled to ensure good sealing performance and long-term stable operation in harsh working environments.