Extension bar

Extension bars expand the reach of hand tools when working with bolts and nuts in deep or confined positions. This product group includes swivel joints rotating 180 degrees, T-handle wrenches transmitting force evenly, U-shaped speed handles for fast turning, and sliding T-bars adjusting length.

Square drives from 1/4 to 1 inch comply with DIN 3120, DIN 3122, DIN 3123 and ISO 1174, compatible with common socket systems. Chrome Vanadium material with chrome-nickel plating resists corrosion, lengths from 40mm to 750mm suit different working spaces. Ball-lock mechanisms hold sockets firmly, two-component plastic grips with grooves prevent slipping.

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Extension bars play an important role in expanding the reach of hand tools, especially when working with bolts and nuts in deep or confined positions. This product group includes swivel joints, T-handle wrenches, U-shaped speed handles and sliding bars, each serving a specific need in mechanical assembly and maintenance work.

Products in the group comply with standards DIN 3120, DIN 3122, DIN 3123 and ISO 1174, ensuring compatibility with common socket systems. Common square drive sizes are 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch and 1 inch, allowing connection with many different types of sockets and accessories. The main manufacturing material is Chrome Vanadium, providing the hardness and wear resistance necessary for high-torque work.

Surfaces are typically treated with chrome-nickel plating to increase service life and resist corrosion. Product lengths range from 40mm to 750mm, depending on the intended use and working space. Ball-lock mechanisms appear on many models, helping to hold sockets firmly during operation. Some products have two-component plastic grips with grooves to increase friction and prevent slipping when applying high force.

Classification by operating mechanism

The product group is divided into several types based on force transmission mechanism and working angle. Swivel joints allow rotation within a 180-degree range, helping to reach bolts at angled or difficult positions. L-shaped wrenches have two identical square drives, flexible for switching grip positions depending on space. U-shaped speed handles provide long leverage, suitable when large torque is needed without power tools. T-sliding bars allow adjustment of handle length, increasing control over applied force.

Swivel joint models such as 795-1-4, 795-3-8, 795-1-2 and 795-3-4 are designed specifically for impact wrenches, withstanding high torque and rotational speed. They have both male and female ends with the same square standard, plus through-holes for safety pins. Model 795-1 is 128mm long with a 1-inch square hole, serving heavy industrial applications. Products 1450-8 and 870-9 have shorter lengths, 45mm and 50mm respectively, suitable for tight spaces.

Swivel handle wrenches and offset handles

Swivel handle wrenches combine a long handle with a universal swivel joint, creating flexible working angles. Model 770-L9-L10 has three sizes 250mm, 390mm and 450mm, 1/2 inch square drive, suitable for professional mechanical work. Product 770-S2 is 500mm long with 3/4 inch square drive, meeting standards DIN 3120-B 20 and ISO 1174, handle covered with soft plastic grooves to increase friction. Model 870-7 is 250mm long, 3/8 inch square drive per DIN 3120-A 10, two-component plastic grip, ball-lock socket retention.

Offset handle wrenches such as 770-S14 are 500mm long with 3/4 inch square drive, fixed-angle design helps transmit force more stably than swivel types. Model 770-L8 in L-shape has two identical 1/2 inch square drives, 190mm long, allowing flexible switching of grip positions. Product 770-S7 at 500mm long provides large leverage, suitable when high torque is needed without power tools.

U-shaped speed handles and socket wrenches

U-shaped speed handles serve to tighten and loosen bolts quickly through continuous rotary motion. Model 770-L2 has 1/2 inch square drive, 380mm long, suitable with many standard socket types. Product 870-2 is 345mm long with 3/8 inch square drive, more compact design for limited space. Both models have ball-lock mechanisms, holding sockets firmly during rotation.

Straight socket wrenches such as 1450-3 are 150mm long, 1/4 inch square drive, meeting DIN 3122 and ISO 3315, handle covered with hard plastic molded to hand grip, with hanging hole. Model 1450-7 has the same length but with swivel head, increasing access to angled positions. Product 870-12 straight type is 500mm long with 3/4 inch square drive, serving applications requiring large leverage.

T-handle wrenches and sliding bars

T-handle wrenches provide good force control through two symmetrical handles. Model 214 has an integrated hex socket head, plastic handle with through-hole, transmitting force evenly and more securely than straight handle types. Product 236-LMG has a 180-degree swivel head with magnet, sliding adjustable length, suitable for tightening nuts in difficult positions. Model 236-LM is similar but without magnet, still maintaining versatility in size.

T-sliding bars such as 770-T-BAR have square drives from 3/8 inch to 1 inch, allowing flexible adjustment of handle length. This design is suitable when leverage needs to change according to required torque. Model 196 is 750mm long in cross shape, specialized for tire changing, providing four simultaneous working directions.

Specialized products and accessories

Some products serve specific needs in automotive and motorcycle maintenance. Model 770-L20 is 100mm long, 1/2 inch square drive, 180-degree swivel, specialized for removing and installing spark plugs on engines. Product 770-S6 is 100mm long with 3/4 inch square drive, complying with DIN 3123, helping to access screws in difficult positions conveniently.

Screwdriver handle wrenches such as 3415 have 1/4 inch internal hex drive, magnet holds 6.3mm hex shank bits firmly, two-component molded plastic handle with rounded square cross-section. Model 185 in L-shape with integrated six-point socket head, suitable for tight spaces where straight wrenches cannot be used.

Selection by square drive size

Square drive size determines compatibility with socket systems and torque capacity. 1/4 inch square drive suits light work, electronics or precision mechanical assembly. Models 795-1-4 at 40mm and 1450-8 at 45mm belong to this group. 3/8 inch square drive balances size and strength, suitable for automotive and motorcycle maintenance. This group includes 795-3-8 at 50mm, 870-9 and 870-2 at 345mm.

1/2 inch square drive is most common in mechanical industry, withstanding high torque. Products such as 795-1-2, 770-L7 at 75mm, 770-L2 at 380mm and 770-L8 at 190mm belong to this group. 3/4 inch and 1 inch square drives are for heavy industrial applications with very high torque. Model 795-3-4 at 105mm, 770-S2 at 500mm and 795-1 at 128mm represent this segment.

Applications in maintenance and assembly

In automotive maintenance, extension bars help reach bolts on vehicle undercarriage, suspension systems and engines without removing many other components. Swivel handle wrenches such as 770-L9-L10 allow working at angles when space does not permit placing a straight wrench. Spark plug socket 770-L20 is specialized for changing spark plugs on various engine types.

In mechanical assembly, U-shaped speed handles such as 770-L2 increase the speed of preliminary bolt tightening before final torquing with torque wrenches. T-handle wrenches such as 236-LMG provide good control when high precision is required. Sliding bars 770-T-BAR allow flexible leverage adjustment according to torque requirements at each assembly stage.

Usage notes

Choose square drive size appropriate to the socket and required torque. Using an undersized square drive for high torque can cause deformation or breakage. Check that ball-lock mechanisms operate properly before starting work, avoiding socket detachment during operation. With swivel head models, do not apply excessive force when the joint is at a large angle, as this increases stress on the joint mechanism.

Store products in a dry place, clean after each use to prevent surface corrosion. Do not use extension bars as levers for pulling or pushing heavy objects, as they are designed only for rotary motion. Periodically inspect moving parts such as swivel joints and sliding mechanisms, apply light lubrication if needed to maintain smooth operation.