Knockout Adapters | McMaster-Carr

	Thread Size Thread Size

M16

M20

	Thread Type Thread Type

NPT

Metric

	Connection Type Connection Type


Conduit	Cord Grip

Electrical Box

	Material Material

Brass

Plastic

	Gender Gender

Female

Male

	Maximum Temperature Maximum Temperature

175° F

210° F

	Minimum Temperature Minimum Temperature

-40° F

0° F

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant with
Exemptions

RoHS Compliant

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

44 Products

Conduit and Cord Grip Thread Adapters

NPT × Metric

NPT × PG

Metric × PG

PG × NPT

PG × Metric

Adapt metric, NPT, and PG conduit and cord grip threads to match knockout threads. A rubber O-ring seals out moisture.

Nylon adapters are lightweight and chemical resistant.

For technical drawings and 3-D models, click on a part number.

Conduit and Cord Grip Connection			Electrical Box Connection			Nickel-Plated Brass		Nylon Plastic
Thread Size	Thread Type	Gender	Thread Size	Thread Type	Gender		Each		Each
NPT × Metric
1/2	NPT	Female	M16	Metric	Male	000000	000000	0000000	00000
1/2	NPT	Female	M20	Metric	Male	000000	00000	0000000	0000
1/2	NPT	Female	M25	Metric	Male	000000	00000	000000	00
3/4	NPT	Female	M25	Metric	Male	000000	00000	000000	00
1	NPT	Female	M32	Metric	Male	000000	00000	000000	00
1 1/4	NPT	Female	M32	Metric	Male	000000	00000	000000	00
NPT × PG
1/2	NPT	Female	PG-9	PG	Male	0000000	00000	000000	00
1/2	NPT	Female	PG-11	PG	Male	0000000	0000	0000000	0000
1/2	NPT	Female	PG-13	PG	Male	000000	00	0000000	0000
1/2	NPT	Female	PG-13.5	PG	Male	0000000	0000	000000	00
1/2	NPT	Female	PG-16	PG	Male	0000000	0000	000000	00
1/2	NPT	Female	PG-21	PG	Male	0000000	00000	000000	00
3/4	NPT	Female	PG-21	PG	Male	0000000	00000	000000	00
1	NPT	Female	PG-29	PG	Male	0000000	00000	000000	00
Metric × PG
M16	Metric	Female	PG-9	PG	Male	0000000	0000	0000000	0000
M20	Metric	Female	PG-11	PG	Male	0000000	0000	000000	00
M20	Metric	Female	PG-13	PG	Male	0000000	0000	000000	00
M20	Metric	Female	PG-16	PG	Male	000000	00	0000000	0000
M25	Metric	Female	PG-16	PG	Male	0000000	0000	0000000	00000
M32	Metric	Female	PG-21	PG	Male	000000	00	0000000	00000
M32	Metric	Female	PG-29	PG	Male	000000	00	0000000	00000
PG × NPT
PG-7	PG	Female	1/4	NPT	Male	0000000	00000	000000	00
PG-9	PG	Female	1/2	NPT	Male	0000000	00000	000000	00
PG-11	PG	Female	1/2	NPT	Male	000000	00000	000000	00
PG-13.5	PG	Female	1/2	NPT	Male	000000	00000	000000	00
PG-21	PG	Female	1/2	NPT	Male	0000000	00000	000000	00
PG-21	PG	Female	3/4	NPT	Male	000000	00000	000000	00
PG-29	PG	Female	1	NPT	Male	0000000	00000	000000	00
PG × Metric
PG-9	PG	Female	M16	Metric	Male	0000000	0000	000000	00
PG-11	PG	Female	M20	Metric	Male	0000000	0000	000000	00
PG-13	PG	Female	M20	Metric	Male	0000000	0000	000000	00
PG-13	PG	Female	M25	Metric	Male	000000	00	0000000	0000
PG-16	PG	Female	M20	Metric	Male	0000000	0000	000000	00
PG-16	PG	Female	M25	Metric	Male	0000000	00000	000000	00
PG-21	PG	Female	M25	Metric	Male	0000000	00000	000000	00
PG-21	PG	Female	M32	Metric	Male	000000	00	0000000	0000
PG-29	PG	Female	M32	Metric	Male	0000000	00000	000000	00
PG-29	PG	Female	M40	Metric	Male	000000	00	0000000	00000
PG-36	PG	Female	M50	Metric	Male	000000	00	0000000	00000