Mechanics Tool Set SAE and Metric 31PCS 1/4" Socket Wrench Set Tools

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Product Description

 

Tool Set Content	1 pc 1/4" Dr. Torque Wrench
	1 pc 3/8" Dr. Torque Wrench
	1 pc 1/2" Dr. Torque Wrench
	3 pcs Non-Marring Lug Flip Impact Sockets
	2 pcs Magnetic Spark Plug: 14mm, 16mm
	3 pcs Socket Extension Bar: 1/4" 3/8" 1/2"
	3 pcs Sockets: 17-19-21mm
	2 pcs Universal Joint: 1/2" 1/4"
	16 pcs 25mm S2 bits
Surface Treatment	Chrome/Matt/Mirror Color
Packaging	Boxes with Cartons
Brand	Union
Certification	CE, EMC, RoHS, UL, GS, PROP65
Origin	China

Torque Wrench Socket Set

are specialized tools designed to tighten bolts, nuts, and other hardware to an exact target torque value. Using precise torque is critical for securing parts without overstraining the threads or leaving dangerous looseness. Torque wrenches allow mechanics and engineers to apply optimal torque quickly and consistently.

How Torque Wrenches Work

Torque wrenches have a ratcheting head calibrated to the desired torque value. As the wrench is pulled, internal springs compress. Upon reaching the preset level, the wrench head slips and emits an audible "click" to signal target torque is achieved. This prevents overtightening. Locking collars allow securing the torque setting. Most wrenches have exchangeable drive sizes like 3/8" or 1/2" to match various bolt and socket heads.

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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