Screw thread information

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Screw Thread Information Tables

Introduction

0.01 First Page
0.02 Contents
0.03 Introduction

Basic information
On screw threads

1.01 The most important dimensions on a screw thread
1.02 Screw thread types and their use
1.03 Basic screw thread tolerances and their significance
1.04 Information on metric (m), american (unc) and pipe threads
1.05 Thread root tolerance area for metric and us (american) un threads
1.06 Flank angle tolerances for metric and un (unified inch) threads
1.07 Threads and pitches
1.08 Bore diameters and tolerances for internal threads
1.09 Screw thread formula
1.10 Thread pitch diameter tolerance areas

Nominal pitch diameter (d2 / D2)

2.01 Calculating nominal pitch diameter d2/D2
2.02 Nominal pitch diameter (d2 and D2) for metric screw threads
2.03 Information on standard m, UNC, Whitworth pipe threads(G) & Whitworth and their pitch diameter tolerances
2.03.1 Information on standard threads and their pitch diameter tolerances (inch version)

Pitch diameter tolerances for normal and/or standard screw threads

3.0 Pitch diameter tolerances-metric screw threads page 1
From m3 – m180 mm and pitches from 0,5 – 8 mm pages 2-15

METRIC (M) External d2

3.01.1 M-6g (standard)
3.01.2 M-4h
3.01.3 M-6e
3.01.4 M-6f

METRIC (M) Internal D2

3.02.1 M-6H (standard)
3.02.2 M-5H
3.02.3 M-6G
3.02.4 M-7H

ISO INCH (UNC, UNF) External d2

3.03.1 UNC-1A
3.03.2 UNC-2A (standard)
3.03.3 UNC-3A
3.03.4 UNF-1A
3.03.5 UNF-2A (standard)
3.03.6 UNF-3A
3.03.7 UNEF-2A (standard)
3.03.8 UNEF-3A

ISO INCH (UNC, UNF) Internal D2

3.04.1 UNC-1B
3.04.2 UNC-2B (standard)
3.04.3 UNC-3B
3.04.4 UNF-1B
3.04.5 UNF-2B (standard)
3.04.6 UNF-3B
3.04.7 UNEF-2B (standard)
3.04.8 UNEF-3B

Other thread types

3.05 ISO 228 pipe threads BSP/G where pressure-tight joints are not made on
the threads
3.06 Tapered pipe threads R, Rc & NPT
– pitch diameter
3.07 American pipe threads 60°
– NPSM & NPSL
3.08 Whitworth threads – BSW & BSF
3.09 Steel conduit thread – Pg (Pr)
3.10 Knuckle thread – Rd
3.11 ISO metric trapezoidal screw threads – Tr
3.12 Acme screw threads (2G, 3G and 4G)
3.13 Acme & Stub Acme Thread Profiles
3.14 Buttress Threads
3.15 UNJ & MJ Threads

Screw thread inspection & Measurement

4.01 Advantages & disadvantages using different methods
4.02 Worth knowing when screw plug and – ring gauges are used for inspection