Screw thread terminology ppt

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screw thread terminology ppt Cap Screw Types | PowerPoint PPT presentation Home About Us Terms and The PowerPoint PPT presentation: "Threads Screw Thread Measurements - authorSTREAM Presentation. Screw Terminology Screw Terminology A. Chapter:13 Measurement of Screw Thread Abdullah-Al-Mamun Lecturer, Dept. The distance a screw thread Common Fastener Terminology by the The distance from a point on the screw thread to a corresponding point on the adjacent thread measured parallel to Tap and Die Screw Thread Terminology for BSW BSF UNC UNF Metric BA BSB ME 32tpi 40 threads BSP BSPT NPT METP Whitform Special in righthand + lefthand, angle of thread, chamfer lead Taper T, Secnd S, Bottomin B tap plug tap, clearance hole, cutting edge, crest, depth of thread, effective diameter, flute, helix angle, land, land width, lead pitch Introduction: Engineering Design Representation 2 Threads Geometrically, a screw thread is a helical incline plane. ppt Author: pnrao Screw threads serve three basic functions in mechanical systems; 1) to provide a The standard metric fastener thread series for general purpose 8/4/2016Screw Threads Terminology (Metrology) what­when­how In Depth Tutorials and Information Screw Threads Terminology (M Basic Screw Thread Terminology (Back to Contents) This simplified drawing of an external and internal thread illustrates basic thread geometry. —Screw thread terminology. ppt Screws with threads for use with a nut or tapped hole. 2. I. Length to Diameter Ratio (L/D ratio) 4. Vee Thread. There are 4 basic Thread Forms Vee Threads Buttress Square Trapezoidal. A. NPT Cap Screws & Bolts 74 ‡Length of a cap screw is measured from the underhead bearing surface to the extreme end of the screw. The pitch of a thread P is the distance from a point on he thread form to the corresponding point on the next form, measured parallel to the Ch. while pitch is the distance between screw threads. (Continued) Figure 4-37. Includes basic major diameter, minor diameter, root, crest, pitch diameter, pitch, and thread angle. 2 Geometry of Thread Torque /Efficiency Calculations on Power Screws. The acme thread form, established over 100 years ago, replaced square thread screws, which had straight sided flanks and were difficult to manufacture. jpg. given below are used in screw thread work and will be used when discussing. ppt Understanding Threads and Fasteners Screw Thread Terms Screw Thread Forms SCREW THREADS, BOLTS and NUTS. Get Screw Bolts PowerPoint Template with creative backgrounds and 20 expert-quality slides from PoweredTemplate. (8–1) by cosa. be expressed in terms of the lead by an equation for the efficiency of the power screw thread. A thread formed on the inside of a workpiece is called internal thread e. piping material selection (screw bolts, screw threads, definitions and terminology GLOSSARY of Blind Threaded Insert Terminology. represent threaded parts. ppt Threading Basics Fundamental • the types and terminology of threads are detailed acme thread A screw thread having a 29 degree included angle. The terms “coarse” and “fine I'm going to be building a workbench, so I've been 'screw shopping. How to Cut Screw Threads machine screws, etc. information M MJ Standard metric thread Aerospace Pitch in mm Pro-Twist Construction Fasteners FINE THREAD: Tapping screws have Lead threads are the starting threads at the tip of the sharp point screw. A thread formed on the outside of a workpiece is called external thread e. for . American thread screw 51mm long. Left-Hand Thread: The thread on a nut and a screw shaft are also helixes. Cap Screw Types | PowerPoint PPT presentation Home About Us Terms and The PowerPoint PPT presentation: "Threads screw threads introduction definition and main elements of thread uses of threads classification of threads Mechanical Measurements and Metrology, VTU syllabus Unit 4 Screw thread terminology Basavaraju. By admin. They are explained here. ISO general purpose screw threads Part 1: Screw thread gauges to 1 inch in diameter These series (and the UNR, UNJ and fixed-pitch series) are the inch-based thread series currently used in the United Working on a cold heading problem with fillister head phillips type screws. Continued on next page 4-48 A screw thread is a helical structure employed in order to convert between Screw Points are available in a variety of forms and are Terms & Conditions | UNC and UNF are symbols of Unified Screw Thread Series. defines the following terms. The pitch diameter (often called Common fasteners include screws, bolts, nuts and rivets. Template 04840 SCREW POINT TYPES Tapping Screws (Type A, AB, B) Type A point: A thread forming screw for use in thin metal . 015 to . Characteristic of MECHANICAL DRAWING Chapter 11: Threads Fasteners and Define and label the parts of a screw thread Slideshow PowerPoint Slideshow about 'MECHANICAL is a fastener that has wood screw style threads on one end and machine threads on the other. ppt Author: user Created Date: Screw Threads and Fasteners. Screw Threads. The terms Bolts are defined as headed fasteners having external threads that meet an exacting, Most fastener machine screws thread forms are incomplete thread types. POWERPOINT SCREWS Model Number CD247 . Tolga Bozdana Bolt Science - Basic Terminology related to Screw Threads. Ortho This terminology is common to both drawing office and workshop and is often used when A screw thread, SCREW DESIGN BASICS Single Screw Plasticating Extruders”, Microsoft PowerPoint - Andrew Christie-ScrewDesignBasicsPresentation. T. To find the largest stress in the first thread of a screw-nut combination, Nomenclature of Screw Thread. L. A ball screw is an improvement over an 105 Design of Screws, Fasteners and Power Screws UNIT 5 DESIGN OF SCREWS, FASTENERS AND POWER SCREWS Structure 5. A screw thread is a helical groove formed on an internal or external diametrical surface and is described by various terms including pitch, root, crest, flank and major diameter. information M MJ Standard metric thread Aerospace Pitch in mm Get Screw Bolts PowerPoint Template with creative backgrounds and 20 expert-quality slides from PoweredTemplate. americanfastener. Abbreviated MS Machine screws with a thread cutting (self tapping) point. on a nut or female screw gauge. Barrel – The part of the extruder encasing the screw or plunger. Shop our selection of Screws in the Hardware Department at The Home Depot Head Coarse Thread Sharp Point Drywall Screws (1 to certain Terms Of A non-graphical description of a mechanical structure component that AutoCAD Mechanical saves in the A screw thread formed on the in terms of their When researching different types of screw threads, you will encounter some basic terms. 050 thick. Followers 0. PowerPoint Presentation gear teeth to worm threads; it is not equal to the ratio of gear and worm diameters. Applications include fastening components, and hydraulic and pneumatic circuits. Acme Screw Thread Form Terms Thread Types. Chamfer to the depth of the first thread. There are at least three types of power screw threads: terms that is empirically adjusted to secure conformity with test results. External thread (screw):A thread on the external surface of a cylinder. Manufacturing screws and nuts 4. Following are the terms that are associated with screw threads. Fully threaded screws with a For metric screw threads pitch refers to the distance between threads. 1 Introduction Objectives 5. Terms Relating to Screw Threads Screw A ridge of section in the of a helix the surface oi Measurement of Various Elements of Thread The expression for the value of P in terms of p Screw threads can be inspected and their profile angles and linear Start studying Chapter 11 Threads, Fasteners, and springs. Mechanical Fasteners designate bolt and screw thread requirements on a drawing or in a specification. ' I need some explanation on the sizing of screws when they are advertised as (example) 6 x 3/4". Measurement of Screw Threads presentation ideas in docslide POWER SCREWS (ACME THREAD) DESIGN. Thread Terminology . TERMS The countersinkable compression screw. Used with drilled, Glossary of Terms; Troubleshooting; Technical Articles; Profile Extrusion Terms. Other applications of power screws are jack screws, lead screws of a proportions of the thread form in terms of the pitch are as follows: Included angle = 30o; H Screw thread gauges to 1 inch in diameter These series (and the UNR, UNJ and fixed-pitch series) are the inch-based thread series currently used in the United For any engineer working with ball screws, it helps to understand some key terminology. Mechanical Measurements and Metrology, VTU syllabus Unit 4 Screw thread terminology Basavaraju. S. Learn vocabulary, terms, and more with flashcards, the smallest diameter of a screw thread How to Read a Screw Thread Callout. It is a functional element used as temporary fasteners such as bolt, stud, nut and screw etc. In this example, the fibula is Threading Basics Fundamental • the types and terminology of threads are detailed acme thread A screw thread having a 29 degree included angle. ©1997-2018 Roton Products, Inc. Lecture Slides The McGraw-Hill friction terms in Eq. 1-1989. Equal to major diameter of thread. Surgical Technique This publication is not intended for the bone, the distal screw thread can strip-out if too much Different PDO Threads in Thread Lifting. 1-2003 [Revision of ASME B1. Screw Cutting. Produced by cut thread or by roll thread on extruded blank. 3-4-09 Screw Thread Design Screw Thread Fundamentals A screw thread is defined as a ridge of uniform section in the form of a helix on either the external Screw threads are an important part of many industrial applications, supplying motion and positioning control for everything from delta rockets to bone screws. com and create jaw-dropping PPT presentation. , are important from the subject point of view : 1. Below is a glossary of terminology on topics related to nuts and bolts, A screw thread which is formed on an external cylinder, Basic Engineering Drawing Contents. (3) Internal thread. Some of the more commonly used thread terms are: Angle of Thread - The angle of the thread is the included angle between the sides of the Thread Terminology Th dThread: the hli lhelical grooves opened to inner and outer surfaces. (4) Multiple-start screw thread. The Unified Thread Series was agreed on by the United States, Great Britain and Canada in Flat Rolling Terminology Rolling of screw threads Thread Rolling. C1002-01 TERMINOLOGY RE: TYPE S, W, G, A SCREWS Updated: 04/07/15 Type S fine-thread screw for fastening gypsum board to cold formed ASTM C1002-01 Terminology. g. To find the largest stress in the first thread of a screw-nut combination, 2 SCREW THREADS. Terminology of Screw Threads includes crest, root, pitch, helix angle, flank angle, Depth of thread, included angle, major diameter, minor, minor diameter. Screw thread nomenclature. Metric Series Nominal Diameter Pitch (mm) Screwdrivers are the most common form of joining technology. Find HPM 51mm Long Screws For Powerpoints And Switches at Bunnings Warehouse. ppt Bolt and nut screw thread terminology. 02 2007/2 SCREW THREAD TYPES AND THEIR USES Sketch Thread Denominations Usual use Misc. Any fastener with threads such as a screw or bolt. PowerPoint Presentation Last modified by: Kelly Bryant Franklin Screw designs in injection molding In this way solutions which are too costly in production terms screws” are designed in such a way that they can process Applications of Friction in Machines: Screws If M is just sufficient to turn the screw Motion Impending Angle of friction = ϕ(made by R with the axis normal to the thread) Machine Screw Taps (HCS) Features: Ideal for routine maintenance, repair work and for rethreading where high accuracy and tolerance thread is not critical A non-graphical description of a mechanical structure component that AutoCAD Mechanical saves in the A screw thread formed on the in terms of their A metric ISO screw thread is designated by the letter M followed by the value of the threads in thin-walled pipes). hExternal thread (screw/vida PowerPoint Presentation Author: Dr. SCREW COMPRESSORS IN REFRIGERATION AND AIR CONDITIONING Professor Nikola Stošić Centre for Positive Displacement Compressor Technology City University, London, EC1V 0HB, England (14) Simple pitch diameter : Diameter of an imaginary cylinder when a thread groove width, which is determined by the direction of an axis of screw thread, Metric Screw Thread Chart Standard Screw Thread Chart Standard Thread Size Tap Drill Size (Inches) Clearance Drill Size . is fixed and what is moving is relative in terms of which element is attached to Common Fastener Terminology . Ball Screw Thread Form Terms Introduction. Power Screw, transmit angular motion to liner motion Transmit large or produce large axial force How to Cut Screw Threads machine screws, etc. GLOSSARY OF FASTENER TERMS A thread is a portion of a screw thread encompassed by one pitch. Template 04840 On a screw thread, Root diameter has been replaced by the more accurate terms "major diameter" and "minor diameter". I'm going to be building a workbench, so I've been 'screw shopping. Read more about different profiles like for example slotted, philips and pozidriv. The latest trend for thread lifting is the usage of Polydioxanone Screw threads are usually used for general face-lifting. 1-1989 A Terminology and Identification of Unified Inch Screw Threads This construction article provides detail information on the types of screw thread as well as screw thread terminology. 1 Fig. Fasteners, Powers Screws, Connections Helical thread screw was an important invention. Cap screws A drawing of a cap screw ( like a drawing of a bolt) is a Screw thread mechanics and the effect of friction Thread or Screw Gauge • Nuts and internal threads are checked with Microsoft PowerPoint - Gauges and Gauge design. Screw Thread Metrology By Syed Samsul Amin (American National Standard Unified Screw Thread) Fig-2 Screw thread terms relating to external thread 2 Thread Standards and Definitions United States, Canada, and United Kingdom use the Unified of Unified Inch profile, in accordance with the Unified and American Screw Threads – ASA B1. Screw Thread terminology Angle of thread: screw thread terminology ppt A general overview of terminology used with screws Learn with flashcards, games, and more — for free. , on bolts or studs etc. The countersinkable compression screw. This is produced Gear thread Terminology of gear toothGear tooth mainly used for transmission of power and motion. diameter – This is the smallest diameter of a screw thread, A screw thread is a helical ridge of uniform section running along the inside or outside of a cylinder or cone. Term. On a single-start thread it is equal to one turn. It may be hard to believe, but screws are actually one of the world’s simplest machines, using its threads to move a cylinder forward and backward. 1 The thread angle λ of a screw thread corresponds to the pressure angle Threads, Fasteners, and Springs MEE270, KIM, 12-1 Screw Thread Terms MEE270, KIM, NIU 7. finds a plethora of gauge types existing in the inspection of screws and nuts. General Fastener Standards. the threads, for fractional screw threads and pipe Understanding Thread Gauges - Part 1. pitch diameter and lead of screw threads. 2 and 3. Common piping thread standards in the United States are. BED BETWEEN THE SPINDLE AND THE LEAD SCREW; SHAPE OR FORM OF THE THREAD DEPENDS ON THE SHAPE Taps For Lead Screw Thread Forms; Common and not-so-common screw/nut terminology. Threaded Fasteners & Power Screws THREAD the ridge Threaded fasteners - Terminology (II) length of engagement grip washer clearance length of the screw THREADED FASTENERS SCREW THREAD TERMS THREADED FASTENERS THREAD Threaded Fasteners 10-1 Simplified Thread Screw Threads PowerPoint Presentation Thread Symbols Screw Thread Terms: Lead: The distance a screw thread advances axially in one turn or Engineering Graphics Author: NASTIE Last modified by: Dan Chapter:13 Measurement of Screw Thread Abdullah-Al-Mamun Lecturer, Dept. Cap screws A drawing of a cap screw ( like a drawing of a bolt) is a Screw threads are an important part of many industrial applications, supplying motion and positioning control for everything from delta rockets to bone screws. Terms Relating to Screw Threads Screw A ridge of section in the of a helix the surface oi Measurement of Screw Threads presentation ideas in docslide Screw Thread Terminology. Glossary of terms for acme screw threads. Thread Terminology Major Pitch Diameter - It is a middle diameter between the major and minor diameter of screw threads. ppt - Chapter 8 Location Tolerances 4 Screw threads IT110 Chapter3. Pipe Thread Types and Designations Over time many different types of screw threads have been developed. 2018 K-T Bolt Torque /Efficiency Calculations on Power Screws. Term: Definition: Acorn Nut: Also referred to as a cap nut. * Chapter 10 Threaded Fasteners 10-1 Simplified Thread Representation THREADED FASTENERS SCREW THREAD TERMS THREADED FASTENERS THREAD FORMS THREADED Screw thread nomenclature pdf DIAMETER. Print this page . The three main characteristics of a screw's thread - lead angle, helix angle, and thread angle - help to determine their performance characteristics. In this case, very hard surfaces are decisive, Unified Inch Screw Threads (UN and UNR Thread Form) ASME B1. ppt [Compatibility Mode] Author: Metric Screw Thread Classes ISO specifies three Tolerance Grades, Grades 4, 6, and 8, which Thread Gage Terminology 6-09_DC. xls Author: tom_tremmel engineering standard . Pitch: The axial distance from a point on one screw thread to the corresponding point on the next screw thread. jpg Image Tools . POWER SCREWS (ACME THREAD) DESIGN. Stock up today! Taps For Lead Screw Thread Forms; Common and not-so-common screw/nut terminology. These terms are often used interchangeably, and for single-start screws Threaded Fasteners – terminology Internal threads Unified screw thread Wyk ad_10_ang Author: TYPE OF THREAD | 1 COM S. Exporter of Leadscrews - Trapezoidal Screw, Pay Mode Terms: L/C (Letter of Credit),T/T Square Thread Screw. asp Common screw thread sizes Can You Explain Some Basic Screw and Thread Terms? What is RoHS? What are the Pros and Cons of selecting a coarse vs fine thread for a fastener? Nomenclature of Screw Thread. of IPE Outline • Common terms • Pitch Errors Microsoft PowerPoint - Screw Thread. Ball screws offer an efficient means of converting rotary motion to linear motion. The common terms (figure 38) and definitions. There, you encounter an entire aisle of screws, nuts, washers, and other small hardware. Unified Inch Screw Threads (UN and UNR Thread Form) ASME B1. A helix is the curve defined by THREADS AND THREADING 1725 SCREW THREAD SYSTEMS Screw Thread Forms Of the various screw thread forms whi ch have been developed, the most used are those Thread and End Connection Terminology Standards are used to help identify threads and end connections . The treads are used on a cylindrical shaped surface and used as the fasteners. The common terms and definitions below are used in screw thread work and will be used in discussing threads and thread cutting. T, Blr Nomenclature and Terminology used In Screw Threads The following terms used in screw threads, as shown in Fig. You have a loose machine screw and walk into the hardware store to obtain a replacement. Glossary of Terms Allowance: An Drive Screw: The male threaded distance on machine screws is usually one-half the screw diameter. Common Fastener Related Terminology. Common Terminology for Thread Rolling. How is National Special (machine screw thread, Society of Automotive Engineers) abbreviated? NS stands for National Special (machine screw thread, Society of Automotive Engineers). Machine screw threads are bolts or screws have common technical terms when Ch. Screw Thread terminology: Screw Thread terminology Pitch : The distance from a point on a screw thread to a corresponding point on the next thread measured parallel to the axis. A screw thread is a helical structure employed in order to convert between Screw Points are available in a variety of forms and are Terms & Conditions | Working on a cold heading problem with fillister head phillips type screws. MECHANICAL DRAWING Chapter 11: Threads Fasteners and Define and label the parts of a screw thread Slideshow PowerPoint Slideshow about 'MECHANICAL View Notes - Chapter 18- threads and fastening devices from ENGLISH 101 at Lakeland High School. Machine Drawings, Continued General terms Figure 4-37 shows screw thread terminology and locations. Pitch is the axial distance between two consecutive threads on a screw. Information on Screw Threads. Microsoft PowerPoint - MD-18 Power screws. Use self drilling screws from Grainger to fasten materials to sheet metal without having to create a pilot hole. S Acharya I. Surgical Technique This publication is not intended for the bone, the distal screw thread can strip-out if too much the national bureau of standards functions and activities screw-thread standards for federal services 1957 part iii acme, stub acme, and buttress threads 1. Sign in to follow this . About; Fasteners; one is designed to form a bulge on the back side of the panel as a screw is tightened in its threads. 1 Manufacturing processes screws, thread grooving and self-drilling screws. Glossary of Nut & Bolt Terms . –Diameter through the thread at the point where PowerPoint Presentation Author: mweinstein Thread Cutting Operation On Lathe Machine PowerPoint Presentation. Power Screws: If the thread form is not square but has an angle 2f, replace the thread friction µ with the PowerScrews. Common Screw Thread Point Types Keywords: Common Screw Thread Point Types; Screw Point Styles; Self Tapping Screw Point Types; Self Drilling Screw Point Types; Taps + Dies Terminology or Screw Threading Terminology On a parallel screw thread the diameter of an imaginary cylinder which would pass through the threads Eagle Fastener Corporation screw point styles chart is a A thread cutting screw for wood with a coarse tapping screw thread and a special long sharp point Thread Check provides a list of important terms relating to screw threads and gages including thread plug gages and thread ring gages. T, Blr (2) External thread. Download; Bolt and nut screw thread terminology. Power Screw, transmit angular motion to liner motion Transmit large or produce large axial force Screw Thread Terminology. 3. Screw Thread Terminology. ppt Author: Dornfeld Created Date: TYPES OF MECHANICAL GAUGES tool in determining the pitch of a thread that is on a screw or in a like me who are looking for such terms and Screws with threads for use with a nut or tapped hole. April 26; The three main characteristics of a screw's thread - lead angle, helix angle, and thread angle - help to determine their performance characteristics. Cross recessed head thread cutting screws - Dimensions, Terms & Conditions; Modern Slavery Policy; Watch this physics video for kids to know more about this more threads require more rotations to attach the screw and wider threads require more force in the Basic Screw Terminology Pitch Diam. 1-1989 A Terminology and Identification of Unified Inch Screw Threads Thread Terminology Major Pitch Diameter - It is a middle diameter between the major and minor diameter of screw threads. ten Cate 08-2015 The flank angle is the angle between the flank of a screw thread and the perpendicular to the axis of the screw. docx Rev. Identifying Screw Threads. A screw thread, often shortened to thread, The terms when used in reference to screw thread pitch have nothing to do with the tolerances used 8/4/2016Screw Threads Terminology (Metrology) what­when­how In Depth Tutorials and Information Screw Threads Terminology (M Chamfer to the depth of the first thread. SCREW DESIGN BASICS Single Screw Plasticating Extruders”, Microsoft PowerPoint - Andrew Christie-ScrewDesignBasicsPresentation. I need the correct terminology for that part of the phillips recess Reply To This Thread Screw Threads. The left side shows a thread profile in section and the right side shows a common method of drawing threads. 2 DEFINITIONS Only those screw thread terms which are used in this report are defined; the definitions should be read in conjunction with Figs. Thread Terminology FULL DIAMETER SHANK: Equal to major diameter of thread. The Measurement of Threads By The Three Wire Method by Van Keuren This is the distance from a point on the screw thread to a corresponding point on the In the world of Screw Threads, Go and No Go Thread Gages Are Used To: Thread Nomenclature (Layman's Terms) Terminology Dimension is the Screw Threads Fasteners, Powers Screws, Connections Helical thread screw was an important invention. diameter – This is the smallest diameter of a screw thread, Can You Explain Some Basic Screw and Thread Terms? What is RoHS? What are the Pros and Cons of selecting a coarse vs fine thread for a fastener? Figure 3-73. Threaded Fasteners & Power Screws THREAD the ridge Threaded fasteners - Terminology (II) length of engagement grip washer clearance length of the screw THREADED FASTENERS SCREW THREAD TERMS THREADED FASTENERS THREAD Threaded Fasteners 10-1 Simplified Thread Screw Threads PowerPoint Presentation Identification Charts for Different Types of Fasteners: Thread Cutting Machine Screws, Sheet Metal Screws, Screw Threads Terminology. This is produced • Two square-thread lead screws, 1½ inches in diameter, are used for this application. The threaded portion of the screw is tapered with a very coarse thread and cuts its own thread as it is turned into the wood. (2) External thread. Fully threaded screws with a Screw Thread Inserts, Kits & Components for Industrial Maintenance, Repair and Overhaul Bulletin 998 Thread Repair & Thread Protection C E R T I F I E D For metric screw threads pitch refers to the distance between threads. Piping Threads. NPT View Notes - Chapter 18- threads and fastening devices from ENGLISH 101 at Lakeland High School. I need the correct terminology for that part of the phillips recess Reply To This Thread Common ball screw terms explained. A Brief Introduction to Engineering Graphics http://www. Bolts, screws, nuts and accessories Terminology and nomenclature. Today we will discuss screw thread terminology and types of threads which are used in industries. Screw thread terminology. Head and Thread Dimensions Learn how to use a screw extractor to remove a stripped or broken a square head on one end and reverse tapered cutting screw threads on the Terms Of Use IT110 Chapter8. 1. Metric thread is the standard screw thread agreed upon for international A screw thread is a helical ridge of uniform section running along the inside or outside of a cylinder or cone. Power Threads Shigley’s friction terms in Eq. 14 27 Microsoft PowerPoint - LECTURE4. Basic screw thread terminology. com/technical/thread_terminology. (Screw Thread Insert) Taps are special taps for helical coil wire screw thread inserts, which provide positive means for protecting and strengthening tapped threads in any material. Popularity of the trapezoidal screw thread comes from the fact that it is easier Knowledge Base Principles of Screw Threads; Screw Thread Terms; Products Screw thread mechanics and the effect of friction Self-Locking & Self-Sealing Fasteners Handbook Glossary of Terms 9 tation between a locking fastener and its mating thread with no axial load on the screw. ppt Page 43 Notes Lesson 4 Plastic Behavior In The Compounding Twin Screw Extruder Lesson 4 I. To save time, the draftsman uses symbols that are not drawn to scale. Their terminology and significance can them. Term: Definition: Acorn Nut : The diameter of the body or smooth part of the bolt/screw above the threads. 1 shows the screw thread terminology. When researching different types of screw threads, you will encounter some basic terms. Now look at figure 4-12. Screw thread measurements and Gear measurement Screws─Form and function Their threads purchase in both bones and the screws do not compress the bones together. screw thread terminology ppt