21PCS Fully Ground HSS Cobalt Twist Drill Bits Set in Metal Box

Price $5.10 Compare
Min Order 100 Sets
Availability In Stock
Shipping From Zhejiang, China
Popularity 507 people viewed
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Hangzhou Union Hardware Co., Ltd

VIP   Audited Supplier 3 years
Profile Certified by SGS/BV
UNT-06
Black
Folded
RoHS, CE, GS
HSS
Customized
Metabo, DeWalt, Hitachi, MAKITA, BOSCH
Black Oxide, Ti-Coated, Amber Finished
DIN, ISO
Drilling Steel, Wood, Concrete and etc
Sea Freight, Air, Train, Express
Available
UN
Plastic Boxes with Cartons
1/4 inch drive
China
820412000
Product Description

Our Advantages

Product Description

 

Hex Size1/4 inch
Length47, 53, 59, 60, 83, 87mm
Working Length16, 20, 26, 32, 36, 50mm
MaterialHSS
InnerFlexible Plastic Holders
PackagingEasy Open Boxes
Surface TreatmentBlack Oxide, Ti-Coated, Amber Finished, Bright Finish
StandardDIN
CustomizationAcceptable
Delivery PackagingPlastic Boxes with Cartons
BrandUnion
OriginChina

PTA Sets

PTA sets provide homeowners with a versatile collection of tools for basic home repair and improvement projects. These kits contain:

  • Screwdriver bits (Phillips and flathead) in common sizes to handle different screw types.
  • Drill bits in popular sizes to drill pilot holes or drive screws. The hex shanks fit any standard drill.
  • Sockets (1/4" or 3/8" drive) to loosen and tighten bolts, nuts, and other hardware. Metric and standard sizes are included.
  • Socket adapters to use 3/8" drive sockets on 1/4" drive tools.
  • Nut driver sockets to drive hex nuts and bolts in wood, metal, and machinery.
  • Bit holders to connect screwdriver bits to and use like manual screwdrivers.

Affordable and compact, PTA sets have professional-grade bits and sockets to tackle minor repairs and projects around the house and garage. The variety covers the most common home improvement tasks.

Main Fastener Coating
TypesApplicationSpray Test HoursCharacteristics
Mirror Nickel-platingALL Metal72HoursStable
Excellent polishing performance
Improve Wear resistance
Wide range of applications
Matt Nickel-platingALL Metal72Hours
Black Nickel-platingALL Metal48HoursHigh absorption rate of solar energy
Used in solar collector panels.
Manganese PhosphateALL Metal72HoursEnhanced resistance
Sand BlastALL Metal-Remove paint, rust, and residue scratches or casting marks
ElectrophoresisALL Metal1000HoursMaintain metallic luster
Anti-corrosion properties
Color ElectroplatingALL Metal96HoursImprove mental strength
Prevent metal oxidation
 
Steel Material  Chemical Composition
TypesCSiVCrMnNiMoCharacteristic
CR-MO0.18-0.230.15-0.35-0.40-0.600.90-1.20-0.13-0.2041xx-series SAE steel grades
Excellent strength-to-weight ratio
Stronger and harder
Not easily welded
CRV0.50.30.180.80-1.100.70-0.90--6000-series SAE steel grades
Suitable for hardening
Resist abrasion, oxidation, and corrosion
Improve material elasticity
S20.40-0.550.90-1.20<0.50-0.30-0.50<0.300.30-0.60One of seven types of shock-resisting steels under the AISI Classification
High strength
High toughness
Wear resistance
High hardness
Resistance to shock loading
45#0.42-0.050.17-0.37-≤0.250.50-0.80≤0.25-Compared with  A3, it has higher strength and resistance to deformation.
A30.95-1.050.10-0.500.15-0.504.75-5.500.40-1.00-0.90-1.40High-quality high carbon alloy tool steel

 

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