Socket

Socket heads serve the need for tightening and loosening bolts and nuts in many fields of mechanical engineering, automotive repair, and industrial equipment maintenance. This product range includes socket heads with common square drive sizes from 1/4 inch, 3/8 inch, 1/2 inch to 3/4 inch and 1 inch, serving from delicate work to applications requiring high torque.

The primary manufacturing material is Chrome Vanadium 31CrV3 according to material code 1.2208, ensuring hardness and load-bearing capacity during operation. The products comply with standards DIN 3120, DIN 3124, ISO 1174 and ISO 2725-1, with socket head designs of 6-point or 12-point depending on the required rotation angle and working space. The surface is chrome-plated with satin or polished finish, providing corrosion resistance and extending service life.

Socket heads in this range originate from German brands ELORA and ELOFORT, along with REMS, meeting the needs from professional mechanics to large-scale repair workshops. Product codes are classified by metric and inch measurement systems, short or long length, as well as specialized head types such as internal hex, Pozidriv, XZN multi-point, and spark plug sockets.

Classification by square drive size

Square drive size determines compatibility with ratchets and the maximum torque the socket head can withstand. The 1/4 inch square drive is suitable for light, delicate work, commonly used in electronic assembly or small equipment repair. The 3/8 inch and 1/2 inch square drives are the two most common sizes in automotive repair and industrial machinery maintenance. The 3/4 inch and 1 inch square drives are for heavy-duty applications requiring high torque, such as in construction, mining, or heavy equipment maintenance.

In the 1/4 inch square drive group, codes such as 13-S and 13-T belong to the ELOFORT line, with short and long designs, meeting DIN 3124 standard. The 3/8 inch square drive offers many options such as 870-A inch system 12-point and 870-M metric system, along with specialized codes such as 871TZ for engine spark plug removal. The 1/2 inch square drive accounts for a large proportion with lines such as 17-S, 17-LT, 770-LM and 770-LT, serving diverse needs from quick tightening to operations at great depth.

The 3/4 inch and 1 inch square drives typically have a more robust design, thicker material to withstand loads better. Code 771-S with 3/4 inch square drive 6-point type complies with DIN 3120-D 20, while 780MA with 1 inch square drive serves applications requiring extremely high torque. These products all have ball-lock grooves to hold the socket head firmly on the ratchet, preventing slippage during operation.

Classification by length and socket head type

Socket head length directly affects the ability to access bolts and nuts in tight spaces or deep recesses. Short socket heads typically have lengths from 25mm to 40mm, suitable for easily accessible positions requiring fast tightening speed. Long socket heads have lengths from 50mm to 100mm, enabling operations at great depth or through narrow gaps that short heads cannot reach. The 6-point and 12-point socket head types also affect the effective rotation angle and nut gripping capability.

Short socket heads such as 13-S and 17-S have an effective rotation angle of 60 degrees with 6-point design, providing firm grip and good force transmission. Long socket heads such as 13-T, 17-LT and 770-LT have standard lengths from 50mm to 80mm, suitable for bolts located deep in machine recesses. Code 1455-T with 50mm length and 771-LTZ 80mm long are typical examples of specialized long socket head groups.

12-point socket heads such as 770-LM, 770-S and 870-M have an effective rotation angle of 30 degrees, allowing fast tightening in limited space. The 12-point design allows the socket head to engage the nut at more positions, increasing operation speed but in return has smaller contact area compared to 6-point. These products all have longitudinal knurling on the body to increase friction when hand-rolling unloaded steps.

Specialized socket heads by socket head shape

In addition to standard hex socket heads, the product range also includes specialized head types serving specific needs. Internal hex socket heads are used for bolts with internal hex holes, Pozidriv and XZN multi-point heads for multi-point screws, specialized spark plug sockets for internal combustion engines, and fuel injector sockets for fuel injection systems. Each head type has its own geometric design, ensuring precise fit with the corresponding screw or bolt head.

Internal hex socket heads such as 13-IN, 1455-INA, 3510-IN and 770-SIN comply with DIN 7422 standard, with common sizes from 3mm to 14mm. Pozidriv heads such as 1455-PZ meet DIN ISO 8764, used for 8-point Pozidriv screws. XZN multi-point heads 3230-XZN and 3530-XZNL serve XZN multi-point screws, commonly found in European automotive industry.

Spark plug socket heads include 871TZ, 871TMG with permanent magnet, 17-LTZ and 222 with handle, suitable for spark plug sizes M10 to M14. Code 770-LTD with 27mm size specialized for fuel injector or nozzle, total length 80mm. These products all have long designs to access spark plugs or injectors located deep in the combustion chamber.

Metric and inch measurement systems

Socket heads are manufactured according to two main measurement systems: metric and inch, corresponding to bolt and nut standards in different geographical regions. The metric system is common in Europe and Asia, with sizes measured in millimeters. The inch system is common in North America, with sizes measured in inch fractions. Choosing the correct measurement system ensures the socket head fits precisely with the bolt, avoiding rounding corners when tightening.

Metric socket heads include codes such as 17-LT, 770-LM, 870-M and 1455-M, with sizes from 4mm to 32mm. Inch socket heads have codes such as 771-LTA, 770-LTA, 770LA, 770LW and 770SW, with sizes from 1/4 inch to 1.1/2 inch. Some product lines such as 1455-M and 780MA provide both measurement systems in the same line.

Inch socket heads typically have the symbol 'A' or 'W' in the product code, such as 870-A and 770LW. These products comply with DIN 3124 and ISO 2725-1 standards, ensuring compatibility with ratchets and bolts according to international standards. Chrome-plated surface with polished or satin finish helps quickly distinguish between measurement systems and provides corrosion protection.

Material and manufacturing standards

The manufacturing material for socket heads is primarily Chrome Vanadium 31CrV3 according to material code 1.2208, a steel alloy with high chromium and vanadium content. Chromium increases corrosion resistance and surface hardness, while vanadium improves toughness and impact resistance. The high-pressure forging process creates a fine grain structure, enhancing mechanical strength. The surface is chrome-plated with satin or polished finish, both protecting against rust and creating an aesthetic finish.

The products comply with many international standards such as DIN 3120 for square drives, DIN 3124 and ISO 2725-1 for socket heads, DIN 7422 for internal hex, and DIN ISO 8764 for Pozidriv heads. Standard DIN 3120-C 10 applies to 3/8 inch square drive, DIN 3120-C 12.5 for 1/2 inch square drive, and DIN 3120-D 20 for 3/4 inch square drive. These standards specify dimensional tolerances, surface hardness, and maximum torque capacity.

Some specialized products use ELORA-Vanadium special steel material, such as 3244-TXL45, with gunmetal finish. Safety accessories such as safety pins 7913, 7923, 7935 and rubber rings 7914, 7924, 7936 help secure the socket head on the ratchet, preventing drops during work at height or in hazardous environments.

Selection and usage considerations

Selecting the appropriate socket head depends on bolt and nut size, working space, and required torque. The socket head must fit tightly with the nut, neither too loose nor too tight. Using the wrong size socket head can round nut corners, causing difficulty for subsequent tightening. The square drive must be compatible with the ratchet or torque wrench being used, ensuring effective and safe force transmission.

The products in this range are designed for hand use, not for use with bolt tightening machines or pneumatic impact wrenches. Use with machines can cause overload, cracking or breaking the socket head. For applications requiring high torque, choose a larger square drive and 6-point socket head to increase contact area. 12-point socket heads are suitable for fast tightening in limited space, but force control is needed to avoid rounding corners.

Store socket heads in a dry place, avoiding moisture to prevent rust. After use, clean oil, grease and dirt adhering to the surface. Periodically inspect ball-lock grooves and square drives to ensure no wear or deformation. Replace socket heads when cracks, chipped corners, or worn square drives causing loose connection with the ratchet are detected. Use safety accessories such as safety pins and rubber rings when working at height or in high-vibration environments.

Socket heads from ELORA, ELOFORT and REMS provide diverse solutions for bolt and nut tightening and loosening needs in many fields. Choosing the correct square drive size, length, socket head type and measurement system helps optimize work efficiency and extend tool life.