☞ This is the 9933th article published by Metal Processing.

Introduction

Common English translations for machining drawings are all here!

Mechanical Drawing English Translations

ALL WELDS CONTINUOUS UNLESS OTHERWISE STATED

All unspecified welds are continuous.

ALL WELDS 3mm FILLET UNLESS OTHERWISE STATED

Unspecified welds have a 3mm fillet.

ALL UNSPECIFIED RADI – R3

Unspecified radius is R3.

REMOVE ALL BURRS AND SHARP EDGES

Remove all sharp edges.

CHANNEL Channel Steel

RSA 708 Angle Steel 70X70X8

M30X1.5 pitch M30X1.5 Tapered Thread

Tackweld Spot Weld

OD 1/4″ Outside Dimension 1/4″

75 CRS Dimension 75, Material Cold Rolled Steel

410 OPENING REF 410 Opening Reference Dimension

40 REF Dimension 40, Reference Value

2.5″ BSP 2.5” Tapered Pipe Thread

2.5″ BSPT HEXAGON 2.5” Hexagonal Tapered Pipe Thread (i.e., Female Thread)

30×2.5 FLAT BAR 30X2.5 Flat Steel

TYP 2 POSNS 2 Positions

11 TOTAL COILS APROX.9 WORKING COILS APROX.RIGHT HAND WOUND ONLY,END COILS SQUARE TO TOUCH

Total coils approximately 11; working coils approximately 9; right-hand wound; ends of the coils squared for contact. (This is a technical description of a spring)

FEMALE Internal Thread (Female)

MALE External Thread (Male)

Eccentric Shaft Eccentric Shaft

Pin Pin

COTTER PIN Cotter Pin

Screw Screw

SET SCREW Set Screw

ROUND NUT Round Nut

SOCKET HEAD CAP SCREW Socket Head Cap Screw

HEX HD SETSCREW Hex Head Setscrew

HEX HD BOLT Hex Head Bolt

CLOSING RING Closing Ring

CIRCLIP Circlip

DISTANCE SLEEVE OF AXLETREE Distance Sleeve of Axletree

AXLETREE Axletree

DEEP GROOVE BALL BEARING Deep Groove Ball Bearing

NON-BUCKLE LENGTH Non-Buckle Length

SPRING Spring

LIFTING EYE BOLT Lifting Eye Bolt

SLOTTED PAN HEAD SCREW Slotted Pan Head Screw

TAPERED ROLLER BEARING Tapered Roller Bearing

THRUST BALL BEARING Thrust Ball Bearing

FLAT KEY Flat Key

SINGLE COIL SPRING WASHER Single Coil Spring Washer

FLAT WASHER Flat Washer

FULL NYLOCK NUT Full Nylock Nut

ROUND NUT Round Nut

REMOVE ALL BURRS AND SHARP EDGES Remove all sharp edges and burrs.

40 REF is a reference dimension for measurement.

OD 1/4’ is the abbreviation for Outside Dimension 1/4″. ——-> It should be: Outside dimension value 1/4″

75 CRS size 75 material is cold-rolled steel plate ——-> It should be: Size 75 material is cold-rolled steel plate

ACCESS Accessory

ADJ Adjustable, Adjust

ADPT Adapter

ADV Advance

AL Aluminum

ALLOW Allowance

LT Alternate

ALY Alloy

AMT Amount

ANL Anneal

APPROX Approximate

ASSEM Assemble

ASSY Assembly

AUTH Authorized

AUTO Automatic

AUX Auxiliary

AVG Average

AWG American Wire Gauge

BC Bolt Circle

BET Between

BEV Bevel

BHN Brinell Hardness Number

BLK Blank, Block

B/NM Bill of Material

BOT Bottom

BP or B/P Blueprint

BRG Bearing

BRK Break

BRKT Bracket

BRO Broach

BRS Brass

BRZ Bronze

B＆S Brown＆Shape

BSC Basic

BUSH Bushing

BWG Birmingham Wire Gauge

CTO C Center-to-Center

CAD Computer Aided Design

CAM Computer-Aided Manufacturing

CAP Capacity

CAP SCR Cap Screw

CARB Carburize

CBORE Counterbore

CCW Counter Clockwise

CDRILL Counterdrill

CDS Cold-Drawn Steel

Some Information on Reading English Drawings

The lower right corner of English engineering drawings contains the title block (equivalent to our title block and some technical requirements), which includes the drawing name (TITLE), designer (DRAWN), reviewer (CHECKED), material (MATERIAL), date (DATE), scale (SCALE), heat treatment (HEAT TREATMENT), and other requirements, such as:

1) TOLERANCES UNLESS OTHERWISE SPECIFIED Unspecified tolerances

2) DIMS IN mm UNLESS STATED If no special requirements, in millimeters

3) ANGULAR TOLERANCE ±1° Angular tolerance ±1°

4) DIMS TOLERANCE ±0.1 Unspecified dimension tolerance ±0.1

5) SURFACE FINISH 3.2 UNLESS STATED Unspecified roughness 3.2

Common Dimension Indications and Requirements

2.1 Hole (HOLE) such as:

(1) Rough Hole: 3″DIA+1CORE Core 3″0+1;

(2) Machined Hole: 1″DIA1″;

(3) Counterbore: Counterbore (Note C’BORE = COUNTER BORE);

(4) Reamed Hole: 1″/4 DIA REAM Reamed Hole 1″/4;

(5) The marking of threaded holes generally needs to indicate the diameter of the thread, the number of threads per inch (thread pitch), type of thread, precision grade, drilling depth, tapping depth, direction, etc., such as:

Example 1.6 HOLES EQUI-SPACED ON 5″DIA (6 holes evenly distributed on a 5″ circumference (EQUI-SPACED = EQUALLY SPACED evenly distributed) DRILL 1″DIA THRO’ Drill 1″ through hole (THRO’ = THROUGH) C/SINK22×6DEEP Counterbore 22×6

Example 2.TAP 7″/8-14 UNF-3B THRO’ Tapping Unified Standard Fine Thread, 14 threads per inch, precision grade 3B

(Note UNF = UNIFIED FINE THREAD American Standard Fine Thread)

1″DRILL 1″/4-20 UNC-3 THD7″/8 DEEP 4HOLES NOT BREAK THRO Drill 1″ hole, tap 1″/4 American coarse thread, 20 threads per inch, tap depth 7″/8, 4 holes must not drill through (UNC = UNIFIED COARSE THREAD American Standard Coarse Thread)

1″-14NS-2THRO Tap American Fixed Special Thread M1″, 14 threads per inch, precision grade 2 (Note NS = NATIONAL SPECIAL THREAD: American Fixed Special Standard)

2.2 Chamfer (CHAMFER)

Example 1/8×45°BEV Chamfer 1/8×45° (Note BEV = BEVEL, slope)

1.5×45°CHAM Chamfer 1.5×45°(Note CHAM = CHAMFER)

2.3 Square (SQUARE)

Example 5″SQUARE 5″×5″ Square

2.4 Section (SECTION)

Example SECTION A-AA-A Section

2.5 Radius

Example 1″RR1″

RADIUS MUST BE SMOOTH AND BLEND INTO FACE The arc must be smooth and tangent to the plane.

2.6 Machining Margin

Example DOTTED LINES INDICATED MAX FINISH 1″/8, Dotted lines indicate maximum machining margin 1″/8

2.7 Part Marking Example

USE 5″/16 RAISED HAIRLINE LETTERS MARKING ON ONE SIDE OF BODY Use raised letters with a height of 5″/16 on one side of the body for marking.

Technical Requirements for Castings and Forgings

Example 1.FORGING MUST BE ANNEALED TO BE BELOW 203 BRINELL HARDNESS Forging must be annealed to a Brinell hardness of <203

Example 2.NORMALIZE TO 163-207BHNMUST BE FREE OF SCALE & RUST Forging must be normalized to Brinell hardness 163-207, and the surface must be free of scale and rust.

Example 3.FORGING TO BE SHOT OR SAND BLASTED Forging must be shot or sandblasted.

Example 4.UNLESS OTHERWISE SPECIFIED DRAFT ANGLES 7° Unless otherwise specified, the draft angle for forging is 7°.

Example 5.CAST TO BE FREE OF EXCESSIVE FLASH Castings must be free of excessive flash.

Example 6.DRAFT ANGLE 2° UNLESS OTHERWISE SPECIFIED Draft angle 2° unless otherwise specified.

In conclusion, reading English mechanical engineering drawings is not insurmountable; as long as you keep looking at them and memorize some words, it will become easier.

-End-

☞ Source: Metal Processing ☞Article edited by: Sophia ☞ Media cooperation: 010-88379864

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