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  • FED-STD-H28-2 Revision B:1991

    Current The latest, up-to-date edition.

    Screw-Thread Standards for Federal Services Section 2 Unified Inch Screw Threads- UN and UNR Thread Forms

    Available format(s):  PDF

    Language(s): 

    Published date:  20-08-1991

    Publisher:  US Military Specs/Standards/Handbooks

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    Abstract - (Show below) - (Hide below)

    Specifies unified UN and UNR inch screw threads. Coverage includes: preferred non standard diameters; diameter pitch combinations; thread class selection; thread allowance and tolerance; completely formed threads; incomplete formed threads; gages and gaging; preferred non standard diameters. Also contains detailed tables and diagrams.

    Scope - (Show below) - (Hide below)

    This section provides the standard for unified inch screw threads to be used by the Federal Services.

    General Product Information - (Show below) - (Hide below)

    Development Note Supersedes FED STD H28/3. B NOTICE 1 - Notice of Validation. (10/2001) B NOTICE 2 - Notice of Validation. (11/2006)
    Document Type Standard
    Product Note NEW CHILD NOT 3 2019 IS NOW ADDED.
    Publisher US Military Specs/Standards/Handbooks
    Status Current
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

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    MIL-E-16400 Revision H:1987 ELECTRONIC, INTERIOR COMMUNICATIONS AND NAVIGATION EQUIPMENT, NAVAL SHIP AND SHORE, GENERAL SPECIFICATION FOR
    MIL-PRF-19207 Revision G:2013 Fuseholders, Extractor Post Type, Blown Fuse, Indicating and Nonindicating, General Specification for
    MS39135 Revision G:2010 NUT, HOSE COUPLING, AUTOMOTIVE AIR BRAKE HOSE ADAPTER
    MIL-R-22368 Revision D:1980 REPAIR KIT AND REPAIR KIT COMPONENTS, FOR COLLAPSIBLE FABRIC TANKS AND BOATS
    MIL-DTL-10884 Revision H:2005 FASTENERS, SNAP
    MIL-H-21367 Revision E:1985 HULL FITTINGS: CONNECTORS, ADAPTER, END SEALS, AND STUFFING TUBES FOR FLEXIBLE, SOLID-DIELECTRIC, RADIO-FREQUENCY CABLES
    MIL-DTL-2726-6 Revision C:2006 Receptacle, Plug, Electrical, 3 - Pin Grounded, 40 - Ampere, 125 - Volt, Alternating Current (Symbol No. 1143.1)
    MIL E 2036 : D ENCLOSURE FOR ELECTRIC AND ELECTRONIC EQUIPMENT, NAVAL SHIPBOARD
    MIL S 15743 : C SWITCH, ROTARY, ENCLOSED
    MIL-T-24270 Revision B:1983 THERMOWELLS FOR THERMOMETERS AND ELECTRICAL TEMPERATURE SENSORS GENERAL SPECIFICATION FOR
    MIL-DTL-2726-1 Revision C:2006 Receptacle, Plug, Electrical, 2-Pin, 40-Ampere, 125-Volt, Direct Current (Symbol No. 715.1)
    MIL-DTL-24231 Revision E:2013 Connectors, Plugs, Receptacles, Adapters, Hull Inserts, and Hull Insert Plugs, Pressure-Proof, General Specification for
    MIL-DTL-2726-52 Revision B:2005 Receptacle, Plug, Electrical, 3-Pin Grounded, 10-Ampere, 450-Volt, 60-Hertz, Single Phase (Symbol No. 1257)
    MS51532 Revision B:1988 FITTING, HYDRAULIC TUBE, FLARED 37 DEGREE AND FLARELESS, STEEL; CAP, TUBE, 37 DEGREE FLARED
    MIL-DTL-81963 Revision C:2011 SERVOCOMPONENTS, PRECISION INSTRUMENT, ROTATING, COMMON REQUIREMENTS AND TESTS, GENERAL SPECIFICATION FOR
    MIL-DTL-45912 Revision B:2013 BOLT, SELF-LOCKING, HEXAGON HEAD, STEEL
    MS9193 Revision A:2010 NIPPLE, TUBE - SAE-AMS5639, BOSS
    MIL-PRF-83419 Revision F:2016 ALTIMETER, SERVO CONTROLLED, AUTOMATIC PRESSURE STANDBY
    SAE AS 4723 : 2012 INSERT, SCREW THREAD, SELF-LOCKING, UNS S66286, KEY LOCKED, PLASTIC SELF LOCKING DEVICE, SOLID FILM LUBRICANT, PROCUREMENT SPECIFICATION FOR
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    PREN 3545-005 : 200P2 AEROSPACE SERIES - CONNECTORS, ELECTRICAL, RECTANGULAR, WITH SEALED AND NON-SEALED REAR, PLASTIC HOUSING, LOCKING DEVICE, OPERATING TEMPERATURES -55 DEGREES C TO 175 DEGREES C - PART 005: FEMALE CODING AND ATTACHMENT SYSTEM FOR MOUNTING ON FREE HOUSING (PLUG) - PRODUCT STANDARD
    SAE AS 1710 : 2014 COUPLING, FUEL, FLEXIBLE, VARIABLE CAVITY, THREADED TYPE WITH FERRULES
    NASM 35206 : 2004 SCREW, MACHINE, PAN HEAD, CRUCIFORM RECESS, CARBON STEEL, UNC-2A
    MIL-N-45938 Revision A:1995 NUT, PLAIN, CLINCH AND NUT, SEL-LOCKING, CLINCH GENERAL SPECIFICATION FOR
    MIL-E-24269 Revision B:1988 EXTINGUISHER, FIRE, CARBON DIOXIDE, 15 POUND, PORTABLE, PERMANENT SHUTOFF, NAVY SHIPBOARD USE
    MIL-S-21472 Revision C:1988 SCREW, SHOULDER, HEXAGON SOCKET-HEAD AND SLOTTED-HEAD GENERAL SPECIFICATION FOR
    MIL-S-45909 Revision C:1989 STUD, LOCKED IN - RING LOCKED SERRATED
    MIL-DTL-15743 Revision F:2017 SWITCHES, ROTARY, ENCLOSED
    MIL-DTL-13735 Revision H:2017 Switches, Toggle: 28 Volt DC
    MIL I 45910 : C INSERT, SCREW THREAD LOCKED IN & RING LOCKED 1 SERRATED GENERAL SPECIFICATION FOR
    MIL-DTL-917 Revision F:2014 ELECTRIC POWER EQUIPMENT, BASIC REQUIREMENTS FOR
    MIL-S-63540 Revision C:1995 STUD, SELF-CLINCHING GENERAL SPECIFICATION FOR
    MIL-DTL-24652 Revision A:2016 Extinguisher, Fire, Aqueous Film Forming Foam (AFFF), 2.5-Gallon
    FF-S-85 Revision D:2005 Screw, Cap, Slotted and Hexagon Head
    MIL-I-8846 Revision D:1994 INSERT, SCREW THREAD, HELICAL COIL
    MIL-B-45908 Revision B:1985 BOLT, EYE, GENERAL SPECIFICATION FOR
    MIL-D-28728 Revision B:1986 DIAL, CONTROL, MULTI-TURN COUNTERS, GENERAL SPECIFICATION FOR
    MIL-S-45915 Revision A:1967 STUD, LOCKED IN - KEY LOCKED - GENERAL SPECIFICATION FOR
    MIL-B-28658 Revision E:1991 BUILDING COMPONENTS, PANELIZED, PREFABRICATED, READY-CUT, RELOCATABLE
    MIL-DTL-24646 Revision C:2015 FUSE BOXES, GENERAL SPECIFICATION FOR
    MIL-DTL-2726 Revision C:2006 RECEPTACLE, RECEPTACLE PLUGS, SWITCH AND RECEPTACLES, AND OUTLETS (ELECTRICAL), GENERAL SPECIFICATION FOR
    MS39207 Revision H:2018 Elbows, Tube - Safety Sleeve Compression Type, 90 Degree
    SAE AS 4891 : 1999 STUD, LOCKED IN, KEY LOCKED, UNS S66286, CLASSIFICATION: 140 KSI PROCUREMENT SPECIFICATION FOR
    MIL B 45912 : A BOLT, SELF-LOCKING, HEXAGON HEAD, STEEL
    MIL-G-25507 Revision B:1991 GAGE, PRESSURE, DIAL INDICATING, OXYGEN 0-2000 PSI
    SAE AS 5356 : 2017 COUPLING, FUEL LINE, FLEXIBLE, 125 PSI GENERAL SPECIFICATION FOR
    MIL E 17807 : C ELEVATOR, WEAPON AND CARGO, ELECTROMECHANICAL (SHIPBOARD)
    MIL S 1222 : H STUD, BOLTS, HEX CAP SCREWS, SOCKET HEAD CAP SCREWS AND NUTS
    MIL-DTL-24552 Revision B:2001 TERMINALS AND SEALS, PLUGS AND SWITCH, CASUALTY POWER SYSTEMS, RECEPTACLE TYPE, GENERAL SPECIFICATION FOR
    MIL-T-14091 Revision E:1988 TRIPOD, SURVEYING, EXTENSION-LEG-TYPE
    MIL-F-19700 Revision A:1987 FASTENERS, SCREW THREADED, AND RELATED ITEMS, NON-MAGNETIC
    MIL-DTL-32408 Base Document:2012 INTEGRAL MOTOR PUMP (IMP)
    MIL T 24552 : A TERMINALS AND PLUGS, CASUALTY POWER SYSTEMS, RECEPTACLE TYPE, GENERAL SPECIFICATION FOR
    MIL-V-24272 Revision B:1985 Valve Manifold, High-Pressure Gas Reducing
    MIL-DTL-24705 Revision B:2010 PENETRATORS, MULTIPLE CABLE, ELECTRIC CABLE, GENERAL SPECIFICATION FOR
    MIL-R-52255 Revision D:1988 REPAIR KIT AND REPAIR KIT COMPONENTS, FOR COLLAPSIBLE FABRIC TANKS, DRUMS, AND BOATS
    MIL F 1224 : D FITTINGS, TUBE, BRASS OR BRONZE, 45 DEGREE FLARED
    MS9194 Revision C:2010 Elbow, Tube - SAE-AMS5646, Boss, 90 Degrees
    MIL-DTL-38999 Revision M:2015 Connectors, Electrical, Circular, Miniature, High Density, Quick Disconnect (Bayonet, Threaded or Breech Coupling), Environment Resistant with Crimp Removable Contacts or Hermetically Sealed with Fixed, Solderable Contacts, General Specification for
    MS39137 Revision H:2010 ADAPTER BODY, AUTOMOTIVE AIR BRAKE
    MIL H 13719 : D HOSE ASSEMBLY, RUBBER, HYDRAULIC BRAKE
    XP PREN 3545-005 : 1997 XP AEROSPACE SERIES - CONNECTORS, ELECTRICAL, RECTANGULAR, WITH SEALED AND NON-SEALED REAR, PLASTIC HOUSING, LOCKING DEVICE, OPERATING TEMPERATURES -55 DEGREE C TO 175 DEGREE C - PART 005: FEMALE CODING AND ATTACHMENT SYSTEM FOR MOUNTING ON FREE HOUSING (PLUG) - PRODUCT STANDARD
    MIL-DTL-2726-5 Revision C:2005 RECEPTACLE, PLUG, ELECTRICAL, 3-PIN GROUNDED, 40 - AMPERE, 450 - VOLT, ALTERNATING CURRENT (SYMBOL NO. 1140.1)
    PREN 3545-006 : 200P2 AEROSPACE SERIES - CONNECTORS, ELECTRICAL, RECTANGULAR, WITH SEALED AND NON-SEALED REAR, PLASTIC HOUSING, LOCKING DEVICE, OPERATING TEMPERATURES -55 DEGREES C TO 175 DEGREES C - PART 006: MALE CODING AND ATTACHMENT SYSTEM FOR MOUNTING ON FIXED HOUSING (RECEPTACLE) - PRODUCT STANDARD
    NASM51959:2015 SCREW, MACHINE, FLAT COUNTERSUNK HEAD, 82 DEGREES, CRUCIFORM RECESS, CORROSION-RESISTANT STEEL, UNC-2A
    MIL-V-24740 Base Document:1990 VALVE, SAFETY, BOILER, REMOTE PILOT OPERATED, FOR SHIPBOARD USE
    MIL-E-24142 Revision B:1984 ENCLOSURE FOR ELECTRICAL FITTINGS AND FIXTURES, GENERAL SPECIFICATION FOR
    NASA SSTD 8070 0098 : 2012 MACHINE SHOP TOLERANCES
    NASM 35649 : 2002 NUT, PLAIN, HEXAGON, MACHINE SCREW UNC-2B
    MIL-DTL-2726-55 Revision B:2005 Receptacle, Plug, Electrical, 4-Pin Grounded, 10-Ampere,, 450-Volt, 400-Hertz, 3-Phase (Symbol No.1260)
    MIL-DTL-2726-2 Revision C:2006 Receptacle, Plug, Electrical, 3 - Pin Grounded, 50 - Ampere, 250 - Volt, Direct Current (Symbol No. 716.1)
    MIL H 13531 : C HOSE, RUBBER AND HOSE ASSEMBLY, RUBBER (HYDRAULIC, FLEXIBLE)
    MIL-DTL-8348 Revision K:2008 Gage Assemblies, Air Pressure, Dial Indicating Chuck Type, Self-Contained
    MIL-S-8879 Revision C:1991 SCREW THREADS, CONTROLLED RADIUS ROOT WITH INCREASED MINOR DIAMETER, GENERAL SPECIFICATION FOR
    SAE AS 4976 : 2012 Insert, Screw Thread, Non-Locking, UNS S66286, Locked in, Key Locked, Procurement Specification for(STABILIZED Mar 2019)
    FF-N-845 Revision D:1981 NUT, PLAIN, WING, INCH AND METRIC
    MS51531 Revision B:1985 NUT, TUBE COUPLING, 37 DEGREE FLARED
    MIL-I-45914 Revision A:1991 INSERT, SCREW THREAD - LOCKED IN, KEY LOCKED
    MIL-V-2961 Revision D:1990 VALVES, GLOBE, PRESSURE REDUCING, GAS SERVICE
    FED-STD-H28-18 Revision B:1991 SCREW-THREAD STANDARDS FOR FEDERAL SERVICES SECTION 18 PHOTOGRAPHIC EQUIPMENT THREADS
    DOD-M-24672 Base Document:1986 MOLDS, AND MOLD HEATING PLATEN FOR MOLDING ELECTRICAL CONNECTORS AND CABLES (METRIC)
    DOD-B-15072 Revision E:1981 BATTERIES, STORAGE, LEAD-ACID, PORTABLE
    MIL-DTL-2 Revision G:2006 VALVES, CYLINDER, GAS (FOR COMPRESSED OR LIQUEFIED GASES), GENERAL SPECIFICATION FOR
    MS9195 Revision B:2010 ELBOW, TUBE - SAE-AMS5639, BOSS, 45 DEGREES
    MS39021 Revision F:1991 SPEEDOMETER MECHANICAL (0-60MPH)
    FED-STD-H28-6 Revision A:1978 SCREW-THREAD STANDARDS FOR FEDERAL SERVICES SECTION 6 GAGES AND GAGING FOR UNIFIED SCREW THREADS-UN AND UNR THREAD FORMS
    A-A-55606 Revision A:2013 Anchor, Guy, and Rods, Anchor
    MIL-G-15214 Revision E:1980 GAGE, DEPTH, WRIST, DIVER'S, SELF LUMINOUS DIAL
    MIL-DTL-81722 Revision B:2017 VALVE, INFLATION, LIFE RAFT, FLU-6/P
    FF-N-836 Revision E:1994 Nut: Square, Hexagon, Cap, Slotted, Castle, Knurled, Welding and Single Ball Seat
    SAE AS 45909 : 2015 STUD, LOCKED IN, RING LOCKED, SERRATED, GENERAL SPECIFICATION FOR
    MS24693 Revision K:1995 SCREW, MACHINE, FLAT COUNTERSUNK HEAD, 100 DEG, CROSS RECESSED, UNC-2A AND UNF-2A (IN./MM)
    MIL-DTL-13791 Revision H:2015 DISTRIBUTOR, IGNITION SYSTEM: INTEGRAL COIL, WATERPROOF 24 VOLT
    NASA PRC 9006 : 2007 PROCESS SPECIFICATION FOR THE INSTALLATION OF KEY-RETAINED SCREW THREAD INSERTS
    MIL-DTL-45910 Revision D:2015 INSERT, SCREW THREAD-LOCKED IN AND RING LOCKED, SERRATED GENERAL SPECIFICATION FOR
    MIL-HDBK-454 Revision B:2007 GENERAL GUIDELINES FOR ELECTRONIC EQUIPMENT
    FF-S-210 Revision B:1981 SETSCREWS, SQUARE HEAD (INCH) AND SLOTTED HEADLESS (INCH AND METRIC)
    MS9196 Revision C:2015 TEE, TUBE - SAE-AMS5646, BOSS
    FED-STD-H28 Revision A:1994 Screw-Thread Standards for Federal Services
    DOD-B-24541 Revision A:1982 BATTERY CELLS AND ELEMENTS, LEAD-ACID, MAIN STORAGE, SUBMARINE; GENERAL SPECIFICATION FOR (METRIC)
    MIL-S-7742 Revision D:1991 SCREW THREADS, STANDARD, OPTIMUM SELECTED SERIES, GENERAL SPECIFICATION FOR
    MIL-C-24224 Revision B:1985 CARTRIDGE, GAS PRESSURE, FOR PRESSURIZING DRY CHEMICAL FIRE EXTINGUISHERS
    13/30285934 DC : 0 BS EN 3545-005 - AEROSPACE SERIES - CONNECTORS, ELECTRICAL, RECTANGULAR, WITH SEALED AND NON-SEALED REAR, PLASTIC HOUSING, LOCKING DEVICE, OPERATING TEMPERATURES -55 DEGREES C TO 175 DEGREES C - PART 005: MALE CODING AND ATTACHMENT SYSTEM FOR MOUNTING ON FREE HOUSING (PLUG) - PRODUCT STANDARD
    MIL-DTL-24558 Revision B:2011 TERMINAL BOXES, CONNECTION, FOR ELECTRICAL AND ELECTRONIC SYSTEMS, GENERAL SPECIFICATION FOR
    MIL S 007742 : C SCREW THREADS, STANDARD, OPTIMUM SELECTED SERIES: GENERAL SPECIFICATION FOR
    XP PREN 3545-006 : 1997 XP AEROSPACE SERIES - CONNECTORS, ELECTRICAL, RECTANGULAR, WITH SEALED AND NON-SEALED REAR, PLASTIC HOUSING, LOCKING DEVICE, OPERATING TEMPERATURES -55 DEGREE C TO 175 DEGREE C - PART 006: MALE CODING AND ATTACHMENT SYSTEM FOR MOUNTING ON FIXED HOUSING (RECEPTACLE) - PRODUCT STANDARD
    MIL M 2082 : C METERS, FLOW, MECHANICAL, VOLUMETRIC POSITIVE DISPLACEMENT, LIQUID, COLD WATER AND HOT WATER TYPE, NAVAL SHIPBOARD USE
    MIL-P-45377 Revision A:1980 POWER SUPPLY. HIGH VOLTAGE, 24 VOLT DIRECT CURRENT
    FED-STD-H28-17 Revision A:1985 Screw-Thread Standards for Federal Services Section 17 Surveying Instrument Mounting Threads
    MIL-DTL-9415 Revision B:2007 DYNAMIC LOUDSPEAKER LS-184A/AIC-10
    MIL-DTL-2726-3 Revision E:2016 RECEPTACLE, PLUG, ELECTRICAL, 4-PIN GROUNDED, 40-AMPERE, 450-VOLT, ALTERNATING CURRENT, 60-HERTZ (SYMBOL NO. 717.1)
    MIL-DTL-17840 Revision D:2018 PUMPS, CENTRIFUGAL, CLOSE-COUPLED, NAVY STANDARD (FOR SURFACE SHIP APPLICATION)
    MIL-DTL-2036 Revision E:2014 ENCLOSURES FOR ELECTRIC AND ELECTRONIC EQUIPMENT, NAVAL SHIPBOARD
    NASM35308:2015 SCREW, CAP, HEXAGON HEAD (FINISHED HEXAGON BOLT), STEEL, CORROSION RESISTING, PASSIVATED, UNF-2A
    BS EN 3545-006:2015 Aerospace series. Connectors, electrical, rectangular, with sealed and non-sealed rear, plastic housing, locking device, operating temperatures -55°C to 175°C Male coding and attachment. System for mounting on fixed housing (receptacle). Product standard
    FF-S-1362 Revision A:2014 STUD, PLAIN, GENERAL PURPOSE
    EN 3545-006:2015 Aerospace series - Connectors, electrical, rectangular, with sealed and non-sealed rear, plastic housing, locking device, operating temperatures -55 °C to 175 °C - Part 006: Male coding and attachment System for mounting on fixed housing (receptacle) - Product standard
    MIL-DTL-18240 Revision F:1997 FASTENER ELEMENT, SELF-LOCKING, THREADED FASTENER, 250 DEGREES F MAXIMUM
    MIL H 13444 : E HOSE & HOSE ASSEMBLIES, RUBBER: FUEL AND OIL
    SAE AS 4892 : 2012 INSERT, SCREW THREAD, SELF-LOCKING, UNS S66286, LOCKED IN, KEY LOCKED, PROCUREMENT SPECIFICATION FOR
    MIL-B-18558 Revision B:1988 Bearing, Propulsion Line Shaft, Oil Disc Lubricated
    NASM51958:2014 SCREW, MACHINE, PAN HEAD, CRUCIFORM RECESS, CORROSION RESISTING STEEL, UNF-2A
    MIL-C-24368 Revision B:1987 CONNECTOR ASSEMBLIES, PLUGS AND RECEPTACLES, ELECTRIC POWER TRANSFER, SHORE TO SHIP AND SHIP TO SHIP, GENERAL SPECIFICATION FOR
    MIL P 62071 : B POWER SUPPLY, HIGH VOLTAGE, SOLID STATE, 24 VOLTS, DIRECT CURRENT
    MIL-E-24715 Base Document:1989 EXTINGUISHERS, FIRE. VAPORIZING LIQUID (BROMOCHLORODIFLUOROMETHANE, HALON 1211)
    MIL-DTL-2726-53 Revision B:2005 Receptacle, Plug, Electrical, 4-Pin Grounded, 10-Ampere, 450-Volt, 60-Hertz, 3-Phase (Symbol No. 1258)
    MIL-A-55059 Revision D:1988 ADAPTER, BATTERY TERMINAL
    MIL-C-11071 Revision D:1983 CLEANING MACHINE, FUEL CAN, DRUM
    MIL F 10884 : G FASTENERS, SNAP
    WW-T-696 Revision E:1984 TRAPS, STEAM
    MIL-R-24169 Revision B:1982 REGULATOR, AIR DEMAND, SINGLE HOSE, DIVER 5
    MIL-S-70335 Revision A:1990 SCREW THREADS, INTERNAL COLD FORMED, GENERAL SPECIFICATION FOR
    MIL P 24705 : A PENETRATORS, MULTIPLE CABLE, FOR ELECTRICAL CABLES, GENERAL SPECIFICATION FOR
    MIL T 24558 : 0 TERMINAL BOXES, CONNECTION, FOR ELECTRICAL AND ELECTRONIC SYSTEMS, GENERAL SPECIFICATION FOR
    ASME B40.200:2008(R2013) Thermometers, Direct Reading and Remote Reading
    ASME Y14.6:2001 SCREW THREAD REPRESENTATION
    ASME Y14.6 : 2001 : R2013 SCREW THREAD REPRESENTATION
    ASME Y14.6 : 2001 : R2007 SCREW THREAD REPRESENTATION
    ASME B40.200 : 2008 THERMOMETERS, DIRECT READING AND REMOTE READING

    Standards Referencing This Book - (Show below) - (Hide below)

    FED-STD-H28-1 Revision A:1985 SCREW THREAD STANDARDS FOR FEDERAL SERVICES, SECTION 1, NOMENCLATURE, DEFINITIONS AND LETTER SYMBOLS FOR SCREW THREADS
    ASME B46.1 : 2009 SURFACE TEXTURE (SURFACE ROUGHNESS, WAVINESS, AND LAY)
    FED-STD-H28-20 Revision B:1994 SCREW THREAD STANDARDS FOR FEDERAL SERVICES, SECTION 20, INSPECTION METHODS FOR ACCEPTABILITY OF UN, UNR, UNJ, M, AND MJ SCREW THREADS
    FED-STD-H28-6 Revision A:1978 SCREW-THREAD STANDARDS FOR FEDERAL SERVICES SECTION 6 GAGES AND GAGING FOR UNIFIED SCREW THREADS-UN AND UNR THREAD FORMS
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