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Screw Threads - MJ Profile, Metric
- Aerospace Standard
- MA1370
- Reaffirmed
Downloadable datasets available
Annotation ability available
Sector:
Issuing Committee:
Language:
English
Scope
This standard specifies the characteristics of the MJ profile metric series of screw threads, altered from ISO 68 M Profile, to include a mandatory controlled radius of 0.18042P to 0.15011P at the root of the external thread and with the minor diameter of both external and internal threads increased to provide a basic thread height of 0.5625H in order to accommodate the external thread maximum root radius. The following detailed requirements are included:
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a
MJ basic profile and design profiles
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b
Standard series of diameter-pitch combinations for nominal thread diameters from 1.6 to 200 mm
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c
Standard thread classes and form tolerances
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d
Formulae for thread dimensions and tolerances
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e
Method of designating MJ threads
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f
Inspection requirement
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g
Tables for selected diameter-pitch combinations for aerospace screws, bolts, nuts, shaft and bearing retaining screw threads, and fluid fittings thread sizes
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h
Tables for MJ screw threads limiting dimensions and tolerances
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i
Symbols for MJ thread dimensions and tolerances
Rationale
MA1370 has been reaffirmed to comply with the SAE five-year review policy.
Recommended Content
Topic
Data Sets - Support Documents
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| TABLE 1 | Theoretical Thread Profile Data (millimeters) | |
| TABLE 1 | Theoretical Thread Profile Data (millimeters) | |
| TABLE 3A | Standard Series for Aerospace Screws, Bolts & Nuts Screw Threads | |
| TABLE 3B | Standard Series for Aerospace Shaft & Bearing Retaining Screw Threads | |
| TABLE 3C | Standard Thread Series for Aerospace Fluid Fittings | |
| TABLE 4 | Limit Values, External Thread Root Radius, R (millimeters) | |
| TABLE 5 | Allowance for Coated or Plated Threads (millimeters) | |
| TABLE 6 | Limiting Dimensions of Aerospace Metric Screw Thread Standard Series (millimeters) | |
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| TABLE 7 | Max Pitch (Lead) and Flank Variation (For Reference Only) | |
| TABLE 8 | Major Diameter Tolerance External Thread | |
| TABLE 9 | Minor Diameter Tolerance Internal Thread | |
| TABLE 10 | Pitch Diameter Tolerance |
Issuing Committee
E-25 General Standards for Aerospace and Propulsion Systems
The SAE E-25 General Standards for Aerospace & Propulsion Systems committee addresses aerospace propulsion systems and components. These systems and components include bolts, screws, nuts, washers, studs, rivets, pins, covers, O-rings, brackets, plugs and associated procurement requirements, as well as solid film lubricants and design specifications for screw threads and fastener assembly requirements.
Reference
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