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Industrial Threaded Products is quickly becoming the premier stocking distributor and importer of coupling nuts in the country. All ITP warehouses stock low carbon and medium carbon steel coupling nuts in Plain, Zinc, and HDG. ITP also stocks every reducer coupler size combination from ¼-20” through 2-4.5” with and without drilled sight holes. Coupling nuts typically join two externally threaded objects, usually threaded rod. When ordering your threaded rod, please ask your sales representative for a quote on coupling nuts. 

Email An ITP Sales Representative

OR CALL 866-929-9983

    Click on a section heading below to access additional product information.

    PRODUCT CHART

    PART#

    Size & Description

    HDG STRAIGHT SIGHT HOLE COUPLERS

    62C212NCSG

    5/8-11 X 2 1/8 COUP NUT W/SIGHT HOLE HDG

    75C225NCSG

    3/4-10 X 2 1/4 COUP NUT W/SIGHT HOLE HDG

    87C250NCSG

    7/8-9 X 2-1/2 COUP NUT W/SIGHT HOLE HDG

    100C275NCSG

    1-8 X 2 3/4 COUPL NUT W/SIGHT HOLE HDG

    112C300NCSG

    1 1/8-7 X 3 COUPLING NUT HDG

    125C300NCSG

    1 1/4-7 X 3″ COUPL NUT W/SIGHT HOLE HDG

    HDG STRAIGHT COUPLERS

    62C212NCOG

    5/8-11 X 2 1/8 COUP NUT HDG

    75C225NCOG

    3/4-10 X 2 1/4 COUP NUT HDG

    87C250NCOG

    7/8-9 X 2-1/2 COUP NUT HDG

    100C275NCOG

    1-8 X 2 3/4 COUPL NUT HDG

    112C300NCOG

    1 1/8-7 X 3 COUPLING NUT HDG

    125C300NCOG

    1 1/4-7 X 3″ COUPL NUT HDG

    Straight Couplers Gr.2 Zinc

    25C87NCOZ

    1/4-20 X 7/8″ COUPLING NUT GR.2 ZINC

    25C175NCOZ

    1/4-20 X 1 3/4″ COUPLING NUT GR.2 ZINC

    31C87NCOZ

    5/16-18 X 7/8″ COUPLING NUT GR.2 ZINC

    37C112NCOZ

    3/8-16 X 1 1/8″ COUPLING NUT GR.2 ZINC

    37C175NCOZ

    3/8-16 X 1 3/4″ COUPLING NUT GR.2 ZINC

    50C125NCOZ

    1/2-13 X 1 1/4″ COUPLING NUT GR.2 ZINC

    62C212NCOZ

    5/8-11 X 2 1/8″ COUPLING NUT GR.2 ZINC

    75C225NCOZ

    3/4-10 X 2 1/4″ COUPLING NUT GR.2 ZINC

    87C250NCOZ

    7/8-9 X 2 1/2″ COUPLING NUT GR.2 ZINC

    100C250NCOZ

    1-8 X 2 1/2″ COUPLING NUT GR.2 ZINC

    112C300NCOZ

    1 1/8-7 X 3″ COUPLING NUT GR.2 ZINC

    125C300NCOZ

    1 1/4-7 X 3″ COUPLING NUT GR.2 ZINC

    Reducer Coupling Nuts Gr.2 Zinc

    37C150NCRZ/25C

    3/8-16 X 1 1/2 REDUCER COUPL-NUT to 1/4-20 PLATED

    50C125NCRZ/37C

    1/2-13 X 1 1/4 REDUCER COUPL-NUT to 3/8-16 PLATED

    62C125NCRZ/50C

    5/8-11 X 1 1/4 REDUCER COUPL-NUT to 1/2-13 PLATED

    75C150NCRZ/62C

    3/4-10 X 1 1/2 REDUCER COUPL-NUT to 5/8-11 PLATED

    87C175NCRZ/75C

    7/8-9 X 1 3/4 REDUCER COUPL-NUT to 3/4-10

    Gr.2 Straight Sight Hole Couplers

    37C175NCSZ

    3/8-16 x 1 3/4″ SIGHT COUPLING NUT  GR.2 ZINC

    50C150NCSZ

    1/2-13 X 1 1/2 SIGHT COUPLING NUT  ZINC

    50C175NCSZ

    1/2-13 x 1 3/4″ SIGHT COUPLING NUT  GR.2 ZINC

    62C187NCSZ

    5/8-11 X 1 7/8 SIGHT COUPLING NUT  GR.2 ZINC

    62C212NCSZ

    5/8-11 X 2 1/8″ SIGHT COUPLING NUT  GR.2 ZINC

    75C225NCSZ

    3/4-10 X 2 1/4 SIGHT COUPLING NUT  GR.2 ZINC

    87C262NCSZ

    7/8-9 X 2 5/8″ SIGHT COUPLING NUT  GR.2 ZINC

    100C300NCSZ

      1-8 X 3″ SIGHT COUPLING NUT  GR.2 ZINC

    112C337NCSZ

      1 1/8-7 X 3 3/8″ SIGHT COUPLING NUT  GR.2 ZINC

    125C375NCSZ

      1 1/4-7 X 3 3/4″ SIGHT COUPLING NUT  GR.2 ZINC

    137C412NCSZ

    1 3/8-6 X 4 1/8″ SIGHT COUPLING NUT  GR.2 ZINC

    150C450NCSZ

      1 1/2-6 X 4 1/2 SIGHT COUPLING NUT  GR.2 ZINC

    175C525NCSZ

      1 3/4-5 X 5 1/4 SIGHT COUPLING NUT  GR.2 ZINC

    200C600NCSZ

    2-4.5 X 6″ SIGHT COUPLING NUT  GR.2 ZINC

    Gr.5 Straight Sight Hole Couplers

    62C187NCS5

    5/8-11 X 1 7/8 SIGHT COUPLING NUT  GR.5 PLAIN

    62C212NCS5

    5/8-11 X 2 1/8″ SIGHT COUPLING NUT  *GR5* PLAIN

    75C225NCS5

    3/4-10 X 2 1/4 SIGHT COUPLING NUT  *GR5* PLAIN

    87C262NCS5

    7/8-9 X 2 5/8″ SIGHT COUPLING NUT  *GR5* PLAIN

    100C300NCS5

      1-8 X 3″ SIGHT COUPLING NUT  *GR5* PLAIN

    112C337NCS5

      1 1/8-7 X 3 3/8″ SIGHT COUPLING NUT  *GR5* PLAIN

    125C375NCS5

      1 1/4-7 X 3 3/4″ SIGHT COUPLING NUT  *GR5* PLAIN

    137C412NCS5

    1 3/8-6 X 4 1/8″ SIGHT COUPLING NUT  *GR5* PLAIN

    150C450NCS5

      1 1/2-6 X 4 1/2 SIGHT COUPLING NUT  *GR5* PLAIN

    175C525NCS5

      1 3/4-5 X 5 1/4 SIGHT COUPLING NUT  *GR5* PLAIN

    200C600NCS5

    2-4.5 X 6″ SIGHT COUPLING NUT  GR5 PLAIN

    Grade 2 Sight Hole Reducers

    50C175NRSZ/37C

    1/2-13 X 3/8-16 REDUC SIGHT COUP NUT GR2 ZINC

    62C175NRSZ/37C

    5/8-11 X 3/8-16 REDUC SIGHT COUP NUT GR2 ZINC

    75C175NRSZ/37C

    3/4-10 X 3/8-16 REDUC SIGHT COUP NUT GR2 ZINC

    87C200NRSZ/37C

    7/8-9 X 3/8-16 REDUC SIGHT COUP NUT GR.2 ZINC

    62C175NRSZ/50C

    5/8-11 X 1/2-13 REDUC SIGHT COUP NUT GR2 ZINC

    75C175NRSZ/50C

    3/4-10 X 1/2-13 REDUC SIGHT COUP NUT GR2 ZINC

    87C200NRSZ/50C

    7/8-9 X 1/2-13 REDUC SIGHT COUP NUT GR.2 ZINC

    100C212NRSZ/50C

    1-8 X 1/2-13 REDUCER COUPL NUT GR.2 ZINC

    75C175NRSZ/62C

    3/4-10 X 5/8-11 REDUC SIGHT COUP NUT GR2 ZNC

    87C200NRSZ/62C

    7/8-9 X 5/8-11 REDUC SIGHT COUP NUT GR2 ZINC

    100C212NRSZ/62C

    1-8 X 5/8-11 REDUCER COUPL NUT GR2 ZINC

    112C300NRSZ/62C

    1 1/8-7 X 5/8-11 REDUC SIGHT COUP NUT GR2 ZNC

    125C300NRSZ/62C

    1 1/4-7 X 5/8-11 REDUC SIGHT COUP NUT GR2 ZNC

    87C200NRSZ/75C

    7/8-9 x 3/4-10 REDUC SIGHT COUP NUT GR2 ZINC

    100C212NRSZ/75C

    1-8 X 3/4-10 REDUCER COUPL NUT GR2 ZINC

    112C300NRSZ/75C

    1 1/8-7 X 3/4-10 REDUC SIGHT COUP NUT GR2 ZNC

    125C300NRSZ/75C

    1 1/4-7 X 3/4-10 REDUC SIGHT COUP NUT GR2 ZINC

    137C350NRSZ/75C

    1 3/8-6 X 3/4-10 REDUC SIGHT COUP NUT GR2 ZINC

    100C212NRSZ/87C

    1-8 X 7/8-9 REDUCER COUPL NUT GR2 ZINC

    112C300NRSZ/87C

    1 1/8-7 X 7/8-9 REDUC SIGHT COUP NUT GR2 ZNC

    125C300NRSZ/87C

    1 1/4-7 X 7/8-9 REDUC SIGHT COUP NUT GR2 ZNC

    137C350NRSZ/87C

    1 3/8-6 X 7/8-9 REDUC SIGHT COUP NUT GR2 ZINC

    150C350NRSZ/87C

    1 1/2-6  X 7/8-9 REDUC SIGHT COUP NUT GR2 ZINC

    175C400NRSZ/87C

    1 3/4-5  X 7/8-9 REDUC SIGHT COUP NUT GR2 ZINC

    200C450NRSZ/87C

    2  X 7/8-9 REDUC SIGHT COUP NUT GR2 ZINC

    112C300NRSZ/100C

    1 1/8-7 X 1-8 REDUC SIGHT COUP NUT GR2 ZINC

    125C300NRSZ/100C

    1 1/4-7 X 1-8 REDUC SIGHT COUP NUT GR2 ZINC

    137C350NRSZ/100C

    1 3/8-6 X 1-8 REDUC SIGHT COUP NUT GR2 ZINC

    150C350NRSZ/100C

    1 1/2-6 X 1-8 REDUC SIGHT COUP NUT GR2 ZINC

    175C400NRSZ/100C

    1 3/4-5 X 1-8 REDUC SIGHT COUP NUT GR2 ZINC

    200C600NRSZ/100C

    2″-4.5  X 1-8 REDUC SIGHT COUP NUT GR.2 ZINC

    125C300NRSZ/112C

    1 1/4-7 X 1 1/8-7 REDUC SIGHT COUP NUT GR.2 ZINC

    137C350NRSZ/112C

    1 3/8-6 X 1 1/8-7 REDUC SIGHT COUP NUT GR2 ZNC

    150C350NRSZ/112C

    1 1/2-6 X 1 1/8-7 REDUC SIGHT COUP NUT GR2 ZNC

    175C400NRSZ/112C

    1 3/4-5 X 1 1/8-7 REDUC SIGHT COUP NUT GR2 ZNC

    200C450NRSZ/112C

    2″-4.5 X 1 1/8-7 REDUC SIGHT COUP GR2 ZINC

    137C350NRSZ/125C

    1 3/8-6 X 1 1/4-7 REDUC SIGHT COUP NUT GR2 ZNC

    150C350NRSZ/125C

    1 1/2-6 X 1 1/4-7 REDUC SIGHT COUP NUT GR2 ZNC

    175C400NRSZ/125C

    1 3/4-5 X 1 1/4-7 REDUC SIGHT COUP GR2 ZINC

    200C450NRSZ/125C

    2″-4.5 X 1 1/4-7 REDUC SIGHT COUP GR2 ZINC

    150C350NRSZ/137C

    1 1/2-6X1 3/8-6 REDC SIGHT COUPL NUT GR2 ZINC

    175C400NRSZ/137C

    1 3/4-5X1 3/8-6 REDC SIGHT COUPL NUT GR2 ZINC

    200C450NRSZ/137C

    2″-4.5 X 1 3/8-6 REDUC SIGHT COUPLING GR2 ZINC

    175C400NRSZ/150C

    1 3/4-5X1 1/2-6 REDC COUPL NUT GR2 ZINC

    200C450NRSZ/150C

    2″-4.5 X 1 1/2-6 REDUC SIGHT COUP GR2 ZINC

    200C500NRSZ/175C

    2″-4.5 X 1 3/4-5 REDUC SIGHT COUP GR2 ZINC

    Grade 5 Sight Hole Reducers

    50C175NRS5/37C

    1/2-13 x 3/8-16  RED SIGHT COUP NUT *GR5* PLN

    62C175NRS5/37C

    5/8-11 X 3/8-16 REDUC SIGHT COUP NUT *GR5* PLN

    75C175NRS5/37C

    3/4-10 X 3/8-16 REDUC SIGHT COUP NUT *GR5* PLN

    87C200NRS5/37C

    7/8-9 X 3/8-16 REDUCE SIGHT COUP NUT *GR5* PLN

    62C175NRS5/50C

    5/8-11 X 1/2-13 REDUC SIGHT COUP NUT *GR5* PLN

    75C175NRS5/50C

    3/4-10 X 1/2-13 REDUC SIGHT COUP NUT *GR5* PLN

    87C200NRS5/50C

    7/8-9 X 1/2-13REDUCE SIGHT COUP NUT *GR5* PLN

    100C212NRS5/50C

    1″-8 X 1/2-13 REDUCE SIGHT COUPL NUT GR.5 PLAI

    75C175NRS5/62C

    3/4-10 X 5/8-11 REDUC SIGHT COUP NUT *GR5* PLN

    87C200NRS5/62C

    7/8-9 X 5/8-11 REDUCE SIGHT COUP NUT *GR5* PLN

    100C212NRS5/62C

    1″-8 X 5/8-11 REDUCE SIGHT COUP NUT *GR5* PLN

    112C300NRS5/62C

    1 1/8-7 X 5/8-11 REDUCE SIGHT COUP *GR5* PLN

    125C300NRS5/62C

    1 1/4-7 X 5/8-11 REDUC SIGHT COUP NUT GR5 PLN

    137C350NRS5/62C

    1 3/8-6 X 5/8-11 REDUCE SIGHT COUP *GR5* PLN

    87C200NRS5/75C

    7/8-9 X 3/4-10 REDUCE SIGHT COUP NUT *GR5* PLN

    100C212NRS5/75C

    1″-8 X 3/4-10 REDUCER SIGHT COUP NUT *GR5* PLN

    112C300NRS5/75C

    1 1/8-7 X 3/4-10 REDUC SIGHT COUP NUT GR5 PLN

    125C300NRS5/75C

    1 1/4-7 X 3/4-10 REDUC SIGHT COUP NUT GR5 PLN

    137C350NRS5/75C

    1 3/8-6 X 3/4-10 REDUC SIGHT COUP NUT GR5 PLN

    150C350NRS5/75C

    1 1/2-6 X 3/4-10 REDUCE SIGHT COUP NUT GR5 PLN

    100C212NRS5/87C

    1″-8 X 7/8-9 REDUCE SIGHT COUP NUT *GR5* PLN

    112C300NRS5/87C

    1 1/8-7 X 7/8-9 REDUC SIGHT COUP NUT *GR5* PLN

    125C300NRS5/87C

    1 1/4-7 X 7/8-9 REDUC SIGHT COUP NUT *GR5* PLN

    137C350NRS5/87C

    1 3/8-6 X 7/8-9 REDUC SIGHT COUP NUT *GR5* PLN

    150C350NRS5/87C

    1 1/2-6 X 7/8-9 REDUC SIGHT COUP NUT *GR5* PLN

    175C400NRS5/87C

    1 3/4-5 X 7/8-9 REDUC SIGHT COUP NUT *GR5* PLN

    200C450NRS5/87C

    2-4.5 X 7/8-9 REDUCE SIGHT COUP NUT *GR5* PLN

    112C300NRS5/100C

    1 1/8-7 X 1″-8 REDUCE SIGHT COUP NUT *GR5* PLN

    125C300NRS5/100C

    1 1/4-7 X 1″-8 REDUCE SIGHT COUP NUT *GR5* PLN

    137C350NRS5/100C

    1 3/8-6 X 1″-8 REDUCE SIGHT COUP NUT *GR5* PLN

    150C350NRS5/100C

    1 1/2-6 X 1″-8 REDUCE SIGHT COUP NUT *GR5* PLN

    175C400NRS5/100C

    1 3/4-5 X 1″-8 REDUCE SIGHT COUP NUT *GR5* PLN

    200C600NRS5/100C

    2″-4.5 X 1″-8 REDUCER SIGHT COUP NUT *GR5* PLN

    125C300NRS5/112C

    1 1/4-7X1 1/8-7 REDUC SIGHT COUP NUT *GR5* PLN

    137C350NRS5/112C

    1 3/8-6X1 1/8-7 REDUC SIGHT COUP NUT *GR5* PLN

    150C350NRS5/112C

    1 1/2-6X1 1/8-7 REDUC SIGHT COUP NUT *GR5* PLN

    175C400NRS5/112C

    1 3/4-5X1 1/8-7 REDUC SIGHT COUP NUT *GR5* PLN

    200C450NRS5/112C

    2″-4.5  X 1 1/8-7 REDUCER SIGHT COUP GR5 PLAIN

    137C350NRS5/125C

    1 3/8-6X1 1/4-7 REDUC SIGHT COUP NUT *GR5* PLN

    150C350NRS5/125C

    1 1/2-6X1 1/4-7 REDUC SIGHT COUP NUT *GR5* PLN

    175C400NRS5/125C

    1 3/4-5X1 1/4-7 REDUC SIGHT COUP NUT *GR5* PLN

    200C450NRS5/125C

    2″-4.5X 1 1/4-7 REDUC SIGHT COUP NUT *GR5* PLN

    150C350NRS5/137C

    1 1/2-6X1 3/8-6 REDUC SIGHT COUP NUT *GR5* PLN

    175C400NRS5/137C

    1 3/4-5X1 3/8-6 REDUC SIGHT COUP NUT *GR5* PLN

    200C450NRS5/137C

    2″-4.5 X 1 3/8-6 REDUCE SIGHT COUP NUT GR5 PLN

    175C400NRS5/150C

    1 3/4-5 X 1 1/2-6 REDUC SIGHT COUP NUT GR5 PLN

    200C450NRS5/150C

    2″-4-5 X 1 1/2-6 REDUCE SIGHT COUP NUT GR5 PLN

    200C500NRS5/175C

    2″-4-5 X 1 3/4-5 REDUCE SIGHT COUP NUT GR5 PLN
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