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. 

OR CALL 866-929-9983

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

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