1 1 Pythagorean theorem 1

1 2 trigonometric function

1 2 1 function name 1

The basic formula of 1.22 triangle 1

1 2 3 trigonometric transformation formula 3

1 3 symbols of common chemical elements 4

1 4 Average linear expansion coefficient of common materials 4

1.5 metal material with hardness of 5

1 6 Common Units 9

1 6 1 UOM type 9

1 6 2 common illegal units in the industry 1 1

Prefix 1 6 3 unit 1 1

1 6 4 conversion of common units 1 1

1 7 basic geometry of area and volume 18

1 8 technical standard 22

Code and number 1 8 1 standard 22

1 8 2 part foreign standard code 23

1 9 priority number and priority number system 24

1 10 screen size 25

1 1 1 26 general wire gauge

Chapter II Ferrous Metal Materials 28

2 1 common ferrous metal material 28

2 1 1 ordinary carbon structural steel 28

2 1 2 high quality carbon structural steel 29

2 1 3 low alloy high strength structural steel 30

2 1 4 alloy structural steel 3 1

2 1 5 free-cutting steel 33

2 1 6 carbon tool steel 35

2 1 7 alloy tool steel 36

2 1 8 high-speed tool steel 39

2 1 9 spring steel 39

2 1 10 rolling bearing steel 40

2 1 1 1 stainless steel and heat-resistant steel 4 1

21111stainless steel 4 1

2 1 1 1 2 heat-resistant steel 42

2 1 12 super alloys and corrosion-resistant alloy 44

2 1 12 1 superalloy 44

2 1 12 2 corrosion-resistant alloy 45

2 1 13 die steel 47

2 1 14 cast steel 48

2 1 14 1 cast steel for general engineering 48

2 1 14 2 alloy cast steel 49

2 1 15 cast iron 50

2 2 Heat treatment of ferrous materials 55

2 2 1 steel conventional heat treatment method 55

Conventional heat treatment process of 58 steel

Chemical heat treatment of 75 steel

Heat treatment of 2 2 4 cast steel 76

Heat treatment of 2 2 5 cast iron

2 3 On-site identification of ferrous materials 89

2 3 1 spark identification method 89

2 3 2 color code recognition method 90

2 3 3 fracture and timbre identification method 9 1

2 4 Specification and quality of ferrous materials 92

2 4 1 Specification and quality of steel plate and strip 92

2 4 1 1 hot rolled steel plate and strip 92

Hot rolled silicon steel sheet 96 for electrical purposes

2 4 1 3 cold-rolled steel plate and strip 97

2 4 1 4 single-layer galvanized steel plate 99

2 4 1 5 cold-rolled tinplate 10 1

2 4 1 6 cold-formed corrugated steel plate 10 1

2 4 1 7 patterned steel plate 104

2 4 2 Specifications and quality of various steel profiles 105

2 4 2 1 hot rolled round steel and square steel 105

2 4 2 2 hot rolled flat steel 107

2 4 2 3 Hot rolled hexagonal and octagonal steel 107

2 4 2 4 Hot rolled equilateral angle steel 108

2 4 2 5 hot rolled unequal angle steel11/

2 4 2 6 hot rolled I-beam 1 13

2 4 2 7 hot rolled common channel steel 1 14

2 4 2 8 cold-drawn round steel, square steel and hexagonal steel 1 16

2 4 3 Steel Pipe and Cast Iron Pipe 1 16

2 4 3 1 Ordinary Seamless Steel Pipe 1 16

2 4 3 2 Precision Seamless Steel Pipe 1 18

2433 hot rolled (extruded) seamless steel pipe 1 19

Seamless steel pipe for 2434 high-pressure boiler 120

2 4 3 5 spiral steel pipe 120

2 4 3 6 Welded steel pipe for conveying low-pressure fluid 12 1

2 4 3 7 Ordinary Stainless Steel Pipe 122

2 4 3 8 stainless steel welded fluid conveying steel pipe 122

2 4 3 9 welded pipe and galvanized pipe 125

2 4 4 steel wire 126

2 4 4 1 universal low-carbon steel wire 126

2442 Important Low Carbon Steel Wire 126

2 4 4 3 Cold-drawn round steel wire, square steel wire and hexagonal steel wire 127

2 4 4 4 carbon spring steel wire 128

Chapter III Nonferrous Metal Materials 129

3 1 nonferrous metals and their alloy products 129

3 1 1 product status name of nonferrous metals and their alloys 129

3 1 2 Non-ferrous metals and their alloys product number 130

3 1 3 color mark of nonferrous metals 133

3 2 Number and brand of non-ferrous metal materials 133

3 2 1 aluminum and aluminum alloys 133

3 2 1 1 aluminum and aluminum alloy number 133

3 2 1 2 grades and uses of partially deformed aluminum alloys 134

Variety, Status and Typical Uses of 3 2 1 3 Aluminum Alloy 135

3 2 2 copper and copper alloy 148

3 2 2 1 copper and copper alloy code 148

Brand and use of 3 2 2 2 copper products 149

3 2 3 Nickel and Nickel Alloy 155

3 2 4 Cast Nonferrous Metals and Their Alloys 155

3 2 5 Other non-ferrous alloys are 156.

3 3 Heat Treatment of Nonferrous Metals 157

3 3 1 Heat treatment of aluminum and its alloys 157

3 3 2 Heat Treatment of Copper and Copper Alloy 158

Heat treatment of 3 3 3 cast aluminum alloy 16 1

3 4 Specifications and Quality of Nonferrous Metal Materials 167

3 4 1 aluminum and aluminum alloy materials 167

3 4 1 1 aluminum and aluminum alloy coil 167

3 4 1 2 Aluminum and Aluminum Alloy Diamond Plate 169

3 4 1 3 aluminum alloy pattern net 170

3 4 1 4 aluminum and aluminum alloy pressed plate 170

3 4 1 5 aluminum foil 172

3 4 1 6 Hot rolled steel strip of aluminum and aluminum alloy 172

3 4 1 7 cold rolled strip of aluminum and aluminum alloy 173

3 4 1 8 aluminum and aluminum alloy extruded bar 175

3 4 1 9 aluminum and aluminum alloy drawn (rolled) round tube 177

3 4 1 10 aluminum and aluminum alloy extruded round tube 179

3 4 1 1 1 aluminum and aluminum alloy extruded thick-walled circular tube 180

3 4 1 12 aluminum and aluminum alloy hot rolled seamless tube 182

3 4 1 13 cold-drawn aluminum alloy pipe 183

3 4 1 14 Equal Angle Aluminum Profile 184

3 4 1 15 Unequal Aluminum Profile 185

3 4 1 16 aluminum and aluminum alloy wire 187

3 4 2 copper and copper alloy materials 189

3 4 2 1 copper and copper alloy plates (strips and foils) 189

3 4 2 2 Copper and Copper Alloy Drawbar 196

3 4 2 3 Copper and Copper Alloy Pipe 199

3 4 2 4 Line 204

3 4 3 Nickel and Nickel Alloy 206

3 4 3 1 nickel and nickel alloy plate 206

3 4 3 2 Nickel and Nickel-Copper Alloy Tube 208

3 4 4 Pb and Pb-Sb alloy 208

3 4 4 1 Pb and Pb-Sb alloy plate 208

3 4 4 2 lead and lead alloy tube 209

3 4 5 zinc and zinc alloy plate (strip) 2 10

The fourth chapter hardware tools 2 12

4 1 measuring tool 2 12

4 1 1 metal ruler 2 12

4 1 2 steel tape measure 2 12

4 1 3 calipers 2 12

4 1 4 vernier caliper 2 13

415cm 2 15

4 1 6 μ m216

4 1 7 scale 2 18

4 1 8 watch holder 2 19

4 1 9 measuring needle 220

4 1 10 Level 220

4 1 1 1 square 222

4 1 12 angle measuring block 224

4 1 13 ping 225

4114 Grade 225

4 1 15 gauge block 227

4 1 16 feeler gauge 228

4 1 17 thread plug gauge and ring gauge 229

4 1 18 samples and sample blocks 23 1

4 1 19 sine gauge 23 1

4 1 20V Block 232

4 1 2 1 instrument 232

4 2 Hand tools 233

4 2 1 pliers 233

4 2 1 1 needle-nosed pliers 233

4 2 1 2 flat pliers 234

4 2 1 3 round nose pliers 234

4 2 1 4 oblique nose pliers 234

4 2 1 5 circlip mounting pliers 235

4 2 1 6 top cutting pliers 235

4 2 1 7 pliers 236

4 2 1 8 carp pliers 236

4 2 1 9 Nutcracker 236

4 2 1 10 bolt cutters 237

4 2 1 1 1 olecranon bolt cutters 237

4 2 1 12 pliers 237

4 2 1 13 pipe wrench 238

4 2 1 14 water pump pliers 238

4 2 2 Wrench 239

4 2 2 1 Single-ended wrench and ring wrench 239

2 2 2 2 2 Double-headed Dumb Wrench and Torx Wrench 239

4 2 2 3 Dumb Wrench 240 for Explosion Protection

4 2 2 4 wrench 24 1

4 2 2 5 Dual-purpose Wrench 24 1

4 2 2 6 Knock the blunt wrench and knock the ring wrench 24 1

4 2 2 7 angle wrench 242

4 2 2 8 Special wrench 243

4 2 3 screwdriver 244

4 2 3 1 slotted screwdriver 244

4 2 3 2 Phillips screwdriver 244

4 2 3 3 Multifunctional screwdriver 245

4 2 3 4 Spiral ratchet screwdriver 245

4 3 fitter tools 245

4 3 1 marking tool 245

4 3 1 1 punch 245

4 3 1 2 rule 246

4 3 1 3V shaped iron 248

4 3 1 4 square box 249

4 3 2 hole machining tool 249

4 3 2 1 twist drill bit 249

4322 Income 25 1

4 3 2 3 center drill 25 1

4 3 2 4 hole drill 252

4 3 2 5 carbide taper shank drill bit 252

4 3 2 6 countersink 254

4 3 2 7 Reamer 254

4 3 2 8 wrench three-jaw drill chuck 26 1

4 3 3 Threading Tool 262

4 3 3 1 common thread tap 262

4 3 3 2 pipe thread tap 265

4 3 3 3 Nut Tap 266

4 3 3 4 Spiral fluted tap 268

4 3 3 5 Dice 269

4 3 3 6 Threaded Drum and Threaded Washboard 27 1

4 3 3 7 Tap wrench, die holder and pipe thread hinge plate 275

4 3 3 8 Chip Rack 275

3 4 Assembly Tool 276

4 3 4 1 internal square wrench 276

4 3 4 2 T Allen key 276

4 3 4 3 end wrench 276

4 3 4 4 socket wrench 277

4 3 4 5 Torque wrench 280

4 3 4 6 circlip mounting pliers 280

4 3 5 sawing tool 28 1

4 3 5 1 saw blade 28 1

4 3 5 2 hacksaw frame 282

4 3 6 chisel tool 282

4 3 6 1 chisel 282

4 3 6 2 Hammer 283

4 3 6 3 Belt Puncher 285

4 3 7 Archiving tool 285

4 3 7 1 fitter file 285

4 3 7 2 plastic file 286

4373 special-shaped file 287

4 3 7 4 Saw files 287

4 3 8 Scraping tool 288

4 3 9 Calibration Tool 289

4 3 9 1 standard unit 289

4 3 9 2 Standard Level 289

4 3 9 3 square 290

4394 square square 29 1

4 3 10 vice 29 1

4 3 10 1 common vise 29 1

4 3 10 2 Multi-function vise 292

4 3 10 3 square hole vise 292

4 4 Turning tool 293

4 4 1 high speed steel tool bar 293

4 4 2 carbide welding lathe blade 293

4 4 3 carbide turning tool 296

4 4 3 1 external surface turning tool 296

4 4 3 2 Inner surface turning tool 297

4 4 3 3 Carbide Machine Clamping Re-sharpening Blade 297

4434 Machine Clamping Tool 299

4 4 3 5 indexable turning tool 300

4 4 3 6 Cemented Carbide Adjustable Floating Boring Tool 300

4 4 3 7 Knife Row 30 1

4 4 3 8 taper shank tool transition sleeve 30 1

4 5 Milling Tool 302

4 5 1 milling cutter 302

4 5 1 1 high speed steel cylindrical milling cutter 302

4 5 1 2 high speed steel end mill 302

4 5 1 3 high speed steel saw blade milling cutter 308

4 5 1 4 high speed steel keyway milling cutter 3 10

4 5 1 5 high-speed steel t-slot milling cutter 3 1 1

4 5 1 6 high-speed steel semi-circular keyway milling cutter 3 12

4 5 1 7 rectangular external spline forming milling cutter 3 13

4 5 1 8 semi-circular milling cutter 3 15

4 5 1 9 angle milling cutter 3 15

4 5 1 10 high-speed steel three-sided edge milling cutter 3 17

4 5 1 1 1 die milling cutter 3 18

4 5 1 12 disc gear milling cutter 3 19

4 5 1 13 bevel gear milling cutter 320

4 5 1 14 indexable milling cutter 32 1

4 5 2 Clamping tool 326

4 5 2 1 short taper shank milling cutter chuck 327

4522 Elastic milling chuck 328

4 5 2 3 taper shank milling cutter milling cutter chuck 328

4 5 2 4 milling cutter chuck 329, milling cutter with flat handle

4 5 2 5 Quick Change Milling Cutter Milling Cutter Chuck 329

4 5 2 6 Needle roller milling chuck 330

4527 boring head 330

4 5 2 8 machine vice 33 1

4 5 3 Milling Mandrel 332

4 5 3 17∶24 taper shank milling cutter bar 332

4 5 3 2 Morse taper shank milling cutter bar 334

4 5 3 37∶24 Taper shank with longitudinal key end milling cutter shank 335

Morse taper shank with longitudinal key end milling cutter bar 335

4 5 3 57∶24 Taper shank end milling cutter bar with end key 336

Morse taper shank with end key end milling cutter bar 337

4 5 4 Intermediate sleeve 337

4 5 4 17∶24 Cone/Morse Cone Intermediate Sleeve 337

4 5 4 27:24 Cone/Morse Cone Long Intermediate Sleeve 338

4 5 4 37:24 Cone/Morse Cone Short Intermediate Sleeve 339

45447: 24 Tapered intermediate sleeve 339

4 5 4 5 Morse cone intermediate sleeve 34 1

4 5 4 6 Quick replacement of intermediate sleeve 34 1

4 6 planing, inserting and rolling tools 34 1

4 6 1 planer lever 34 1

4 6 2 Gear shaper cutter 342

4 6 3 gear hob 344

4 7 Grinding tool 345

4 8 Welding and cutting tools 347

4 8 1 welding torch 348

4 8 2 Cutting torch 35 1

483 Welding and cutting torch 352

4 8 4 carbon arc gouging welding torch 354

4 8 5 Cutting nozzle 354

4 8 6 Welding nozzle 358

4 8 7 electrode clamp 359

4 8 8 oxygen and acetylene quick connector 363

4 8 9 Welding valve 363

4 9 Pipe Tools 365

4 9 1 pipe thread die 365

4 9 2 Tapered pipe thread reamer 366

4 9 3 tube hinge plate 367

4 9 4 pipe wrench 367

4 9 5 chain pipe wrench 367

4 9 6 pipe wrench 368

497 straight through the expander 368

4 9 8 pipe cutter 369

4 9 9 electric threading machine 369

4 9 10 pipe bender 370

4 9 1 1 pipe end forming machine 370

4 10 power tools 37 1

4 10 1 soldering iron 37 1

4 PCs 10 2 test pens (devices) 37 1

4 10 3 electrotome 37 1

4 10 4 electric pliers 37 1

4 10 5 wire stripper 372

4 10 6 Fastening pliers 372

4 10 7 hydraulic thread tightening pliers 373

4 10 8 hydraulic tongs 373

4 10 9 clamp 373

4 10 10 wire clamp 373

4 10 1 1 broken wire shears 374

4 1 1 woodworking tools 375

4 1 1 1 hammer 375

4 1 1 2 woodworking drill 376

4 1 1 3 woodworking saw 377

4 1 1 4 woodworking planer 38 1

4 1 1 5 woodworking chisel 384

4 1 1 6 wooden file 385

4 1 1 7 Woodworking Axe 386

4 1 1 8 connector 386

4 12 building tools 386

4 12 1 measuring tool 386

4 12 2 bricklayer's tools 387

4 12 3 Decorative tools 39 1

4 12 4 excavation tool 392

4 pieces 13 gardening tools 394

4 14 electric tools 395

4 14 1 metal cutting class 396

4 14 1 1 electric drill 396

4 14 1 2 battery electric drill screwdriver 400

4 14 1 3 magnetic drill 400

4 14 1 4 cemented carbide impact drill 40 1

4 14 1 5 electric scissors 402

4 14 1 6 electric punching and shearing 404

4 14 1 7 profile cutting machine 404

4 14 1 8 electric reciprocating knife saw 407

4 14 1 9 electric self-climbing pipe saw 407

4 14 1 10 electric tapping machine 408

41411/electric beveling machine 408

4 PCs 14 2 polishing classes 4 10

4 14 2 1 angle grinder 4 10

4 1422Die electric mill 4 12

4 1423 polisher 4 13

4 14 2 4 disc grinder 4 13

4 14 2 5 swing grinder 4 14

4 14 2 6 belt sander 4 14

4 14 2 7 grinder 4 15

4 14 3 assembly operation class 4 17

4 14 3 1 electric screwdriver 4 17

4 1432 self-tapping screwdriver 4 18

4 1433 Electric Wrench 4 18

4 14 3 4 fixed torque electric wrench 420

4 14 4 cutting class 420

4 14 4 1 planer 420

4 14 4 2 chainsaw 42 1

4 14 4 3 chain saw 422

4 14 4 4 electric jigsaw puzzle 423

4 14 4 5 Edge Trimmer 424

4 14 4 6 Woodworking 425

4 14 4 7 grooving machine and tenoning machine 426

4 14 4 8 Wood Cutting Machine 426

4 14 5 Building 427

4 14 5 1 impact drill 427

4 14 5 2 hammer drill 429

4 14 5 3 electric hammer 429

4 14 5 4 electric pickaxe 432

4 14 5 5 wet grinder 432

4 14 5 6 electric stone cutting machine 433

4 14 5 7 concrete vibrator 433

4 14 5 8 Double Thermal Insulation Concrete Drilling Machine 435

4 14 5 9 Brick Wall Groove Milling Machine 436

4 14 5 10 electric engraving machine 437

4 14 5 1 1 electric rock drill 437

4 15 pneumatic tools 437

4 15 1 metal cutting class 44 1

4 15 1 1 gas driller 44 1

4 15 1 2 hand-held pneumatic drilling rig 442

4 15 1 3 pneumatic tapping machine 442

4 15 1 4 pneumatic chamfering machine 442

4 15 1 5 pneumatic scissors 443

4 15 1 6 pneumatic punching and shearing 443

4 15 1 7 gas grinding 444

4 15 1 8 pneumatic grinder 444

4 15 1 9 pneumatic angle grinder 444

4 15 1 10 pneumatic grinder 445

41511/pneumatic tamping machine 446

4 15 2 assembly operation class 447

4 15 2 1 pneumatic rivet gun 447

4 15 2 2 pneumatic riveting machine 448

4 1523 pneumatic nailing gun 448

4 15 2 4 air trigger 450

4 15 2 5 pneumatic screwdriver 450

4 15 3 pickaxes and shovels 45 1

4 15 3 1 air shovel 45 1

4 15 3 2 broken pickaxe 452

4 1533 hand-held rock drill 453

4 16 hydraulic tools 453

4 16 1 hydraulic crimping pliers 453

4 16 2 manual hydraulic pipe bender 454

4 16 3 hydraulic torque wrench 455

4 16 4 separated hydraulic puller 456

4 16 5 split hydraulic punch 457

4 16 6 hydraulic cutter 457

4 16 7 Hydraulic Bending Machine 457

4 16 8 hydraulic perforator 457

4 16 9 Hydraulic Gang Qian 458

4 16 10 hydraulic steel bar cutter 458

4 16 1 1 manual hydraulic pump 458

4 17 lifting tools 459

4 17 1 jack 459

4 17 2 lifting block 464

4 17 3 manual hoist 4 65

4 17 4 chain pulley 467

4 17 5 electric hoist 468

The fifth chapter mechanical hardware 47 1

5 1 fastener 47 1

5 1 1 thread 47 1

5 1 1 1 common thread 474

5 1 1 2 pipe thread 48 1

5 1 1 3 trapezoidal thread 483

5 1 1 4 serrated thread 484

5 1 2 bolt 485

5 1 3 screw 499

5 1 4 nut 507

5 1 5 washer 5 13

5 1 6 retaining ring 5 19

5 1 7 Pin 525

5 1 8 rivet 53 1

5 2 connector 535

5 2 1 Ordinary Ping Jian 535

5 2 2 Ping Jian Guide 536

5 2 3 semicircle key 537

5 2 4 Ordinary Wedge Keys 538

5 2 5 Hook wedge key 538

5 2 6 Spline 539

5 3 Spring 54 1

5 3 1 ordinary cylindrical helical compression spring 54 1

5 3 2 Ordinary Cylindrical Spiral Tension Spring 545

533Ordinary cylindrical helical torsion spring 547

5 3 4 Belleville Spring 547

5 4 Transmission 550

5 4 1 drive belt 550

5 4 2 silk woven conveyor belt 554

5 5 chain 556

5 5 1 roller chain 5 5 6

5 5 2 sprocket 559

5 6 Gear, Worm and Worm 560

5 6 1 gear module series 560

5 6 2 Diameter of worm indexing circle 56 1

563 Number of worm heads and number of teeth of worm wheel 56 1

5 7 bearing 56 1

5 7 1 rolling bearing with code 562

5 7 2 Rolling bearing seat 608

5 7 3 sliding bearing 6 10

5 7 4 Sliding Bearing Bushing 6 13

5 7 5 steel ball 6 16

5 8 machine tool attachment 6 18

5 8 1 Intermediate Frame and Heel Bracket 6 18

5 8 2 taper shank tool transition sleeve 6 18

583Qian619

5 8 4 Dial 625

5 8 5 Chuck 626

5 8 6 panel 629

5 8 7 dividing head 629

5 8 8 turntable 63 1

Chapter VI Electrical Hardware 634

6 1 main electrical appliance 634

6 1 1 button switch 634

6 1 2 master controller 637

6 1 3 travel switch 638

6 1 4 cam switch 642

6 2 Low voltage switch 644

6 2 1 knife switch 644

6 2 2 microswitch 65 1

6 2 3 Automatic air switch 652

6 2 4 Universal Automatic Air Switch 655

6 3 fuse 658

6 3 1 low voltage fuse 658

6 3 2 Ordinary Low Voltage Fuse 664

6 4 High voltage disconnector and high voltage circuit breaker 666

6 4 1 high voltage disconnector and switchgear 666

6 4 2 High voltage circuit breaker 667

6 4 3 High voltage fuse 669

6 4 4 High voltage load switch 670

6 4 5 High voltage switchgear 670

6 5 protector 672

6 5 1 leakage protector 672

6 5 2 Surge protector 673

6 5 3 Overvoltage and Undervoltage Protector 673

6 5 4 Motor protector 674

6 5 5 welding machine protector 675

6 6 Contactor 675

6 6 1 DC contactor 675

6 6 2 AC contactor 676

6 7 relay 679

6 7 1 thermal relay 680

6 7 2 Time Relay 685

6 7 3 Overcurrent Relay 690

6 7 4 DC electromagnetic relay 690

6 7 5 voltage relay 69 1

6 7 6 Intermediate relay 694

6 7 7 Universal Relay 697

6 7 8 Leakage relay 698

6 7 9 Speed relay 698

6 7 10 signal relay 698

6 7 1 1 power relay 699

6 8 transformer 70 1

6 8 1 voltage transformer 70 1

6 8 2 Current Transformer 702

6 9 Motor Starter 703

6 10 frequency converter 706

Chapter VII Building and Decoration Hardware 709

7 1 doors and windows 709

7 1 1 steel doors and windows 709

7 1 2 aluminum alloy doors and windows 7 1 1

7 1 3PVC plastic doors and windows 7 13

7 1 4 automatic door 7 14

7 2 Doors and Windows and Furniture Fittings 7 15

7 2 1 steel bolt 7 15

7 2 2 Doors and Windows Hinges 7 17

7 2 3 Handle 72 1

7 2 4 nails 724

7 2 5 Window hooks, stays and sliding stays 732

7 2 6 Door closers and grounding springs 734

7 2 7 Door locks and window locks 735

7 3 Wire mesh and screening equipment 740

7 3 1 wire mesh specification 740

7 3 2 Copper wire mesh 742

7 3 3 Stainless steel wire mesh 746

7 3 4 galvanized low carbon steel wire mesh 747

7 4 metal mesh 752

7 4 1 steel mesh 752

7 4 2 aluminum mesh 755

7 4 3 aluminum alloy grid 755

7 5 Liquid Piping and Accessories 758

7 5 1 pipeline 758

7 5 2 cast iron pipe 759

7 5 3 Pipeline Accessories 76 1

7 6 Internal threaded connecting valve for water heating 777

7 6 1 gate valve with internal thread connection 777

7 6 2 Internal thread connection stop valve 778

7 6 3 internal thread ball valve 779

7 6 4 Internal thread check valve 780

7 7 Fire fighting tools 782

7 7 1 fire extinguisher name and code 782

7 7 2 Clear water fire extinguisher 784

7 7 3 Portable acid-base fire extinguisher 785

7 7 4 foam extinguisher 786

7 7 5 dry powder fire extinguisher 788

7 7 6 carbon dioxide fire extinguisher 79 1

7 7 7 difluoro monochloro bromomethane fire extinguisher 792

Reference 794