80/120/140mm Hex Shank Sleeve Guide Rod Screw Bit Holder Retractable Extension Bar

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Product Description

 

Groove	Hex Socket
Socket Size	1/4 inch
Diameter	7mm
Length	80mm to 120mm, 120mm to 150mm
Material	Aluminum, Stainless Steel, CRV, S2
Surface Treatment	Blackening oxide/Chrome plating/Manganese phosphate/Sandblast
Packaging	Plastic bags, Blister, Sandwich, Tags
Customization	Acceptable
Brand	Union
Standard	DIN, ASME, JIS
Origin	China

Extension Bars

are a must-have accessory for any toolkit. These simple tools allow you to extend the reach of your drill so you can drill holes in hard-to-access areas.

Bit extension bars are metal rods that attach between your drill chuck and drill bit. They come in varying lengths, usually between 3 inches and 18 inches long. The most common sizes are 6 inches, 12 inches, and 18 inches.

Extension bars are made from durable chrome vanadium steel or carbon steel. They have a male hex shank on one end that fits into your drill chuck, and a female hex socket on the other end to fit your drill bit. Some extension bars have male and female hex ends so you can connect multiple bars together for even longer reach.

When using a bit extension bar, it's important to apply firm pressure and drill straight. The longer the extension, the more chance it has of bending or whipping around if you apply force at an angle. Start drilling slowly and adjust your pressure as needed.

Extension bars are useful for drilling holes in ceilings, floors, decks, cabinets, and any other hard-to-access area. They allow you to avoid using a ladder to get your drill into tight spaces. Many auto mechanics use extension bars to reach engine parts without removing the entire engine.

Main Fastener Coating
Types	Application	Spray Test Hours	Characteristics
Mirror Nickel-plating	ALL Metal	72Hours	Stable Excellent polishing performance Improve Wear resistance Wide range of applications
Matt Nickel-plating	ALL Metal	72Hours
Black Nickel-plating	ALL Metal	48Hours	High absorption rate of solar energy Used in solar collector panels.
Manganese Phosphate	ALL Metal	72Hours	Enhanced resistance
Sand Blast	ALL Metal	-	Remove paint, rust, and residue scratches or casting marks
Electrophoresis	ALL Metal	1000Hours	Maintain metallic luster Anti-corrosion properties
Color Electroplating	ALL Metal	96Hours	Improve mental strength Prevent metal oxidation

 

Steel Material  Chemical Composition
Types	C	Si	V	Cr	Mn	Ni	Mo	Characteristic
CR-MO	0.18-0.23	0.15-0.35	-	0.40-0.60	0.90-1.20	-	0.13-0.20	41xx-series SAE steel grades Excellent strength-to-weight ratio Stronger and harder Not easily welded
CRV	0.5	0.3	0.18	0.80-1.10	0.70-0.90	-	-	6000-series SAE steel grades Suitable for hardening Resist abrasion, oxidation, and corrosion Improve material elasticity
S2	0.40-0.55	0.90-1.20	<0.50	-	0.30-0.50	<0.30	0.30-0.60	One of seven types of shock-resisting steels under the AISI Classification High strength High toughness Wear resistance High hardness Resistance to shock loading
45#	0.42-0.05	0.17-0.37	-	≤0.25	0.50-0.80	≤0.25	-	Compared with  A3, it has higher strength and resistance to deformation.
A3	0.95-1.05	0.10-0.50	0.15-0.50	4.75-5.50	0.40-1.00	-	0.90-1.40	High-quality high carbon alloy tool steel

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