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O-Ring for SAE O-Ring Boss (Straight Thread O-Ring) Fittings & Adapters, 0.25 Inch

Description & Features

This Hercules Sealing Products O-Ring is designed for use with SAE O-Ring Boss (Straight Thread O-Ring) fittings and adapters.

Constructed from Buna-N (90 durometer), this O-Ring offers reliable sealing performance within a temperature range of -30 to +250 degrees Fahrenheit. It has an inside diameter of 0.351 inches, an outside diameter of 0.495 inches, and a width of 0.072 inches, corresponding to a tube size of 0.25 inches.

SKU: B-904

Supplier Part Number (MPN): 568-904

Alternate Part Numbers: C1CL29, H90904, MI-08748165, MINO-00407X88001

Specifications

Brand Hercules Sealing Products	Brand Hercules Sealing Products	Pack Size 1.00	UOM EA	I.D. 0.351 in	Materials Buna-N (90 durometer)	O.D. 0.495 in	Supplier Part Number 568-904	Temperature Range -30 to +250	Thread Sealant No	Tube Size 0.25	Product Weight 0.01 lbs	Alternate Part Numbers Alternate Part Number 568-904, Alternate Part Number C1CL29, Alternate Part Number H90904, Alternate Part Number MI-08748165, Alternate Part Number MINO-00407X88001

Similar Products

Model Number	Tube Size	Materials	Temperature Range	I.D.	Width (E)	O.D.
22617-10 ORB Fitting/Adapter O-Ring	0.625	Buna-N (90 durometer)	-30 to +250	0.755 in	0.097	0.949 in
22617-12 ORB Fitting/Adapter O-Ring	0.75	Buna-N (90 durometer)	-30 to +250	0.924 in	0.116	1.156 in
22617-16 ORB Fitting/Adapter O-Ring	1	Buna-N (90 durometer)	-30 to +250	1.171 in	0.116	1.403 in
22617-4 ORB Fitting/Adapter O-Ring	0.25	Buna-N (90 durometer)	-30 to +250	0.351 in	0.072	0.495 in
22617-6 ORB Fitting/Adapter O-Ring	0.375	Buna-N (90 durometer)	-30 to +250	0.468 in	0.078	0.624 in
22617-8 ORB Fitting/Adapter O-Ring	0.5	Buna-N (90 durometer)	-30 to +250	0.644 in	0.087	0.818 in
B-904 ORB Fitting/Adapter O-Ring	0.25	Buna-N (90 durometer)	-30 to +250	0.351 in	0.072	0.495 in
B-912 ORB Fitting/Adapter O-Ring	0.75	Buna-N (90 durometer)	-30 to +250	0.924 in	0.116	1.156 in
B-916 ORB Fitting/Adapter O-Ring	1	Buna-N (90 durometer)	-30 to +250	1.171 in	0.116	1.403 in
22617-5 ORB Fitting/Adapter O-Ring	0.3125	Buna-N (90 durometer)	-30 to +250	0.414 in	0.072	0.558 in
B-903 ORB Fitting/Adapter O-Ring	0.188	Buna-N (90 durometer)	-30 to +250	0.301 in	0.064	0.429 in
B-906 ORB Fitting/Adapter O-Ring	0.375	Buna-N (90 durometer)	-30 to +250	0.468 in	0.078	0.624 in
B-908 ORB Fitting/Adapter O-Ring	0.5	Buna-N (90 durometer)	-30 to +250	0.644 in	0.087	0.818 in
B-910 ORB Fitting/Adapter O-Ring	0.625	Buna-N (90 durometer)	-30 to +250	0.755 in	0.097	0.949 in
B-914 ORB Fitting/Adapter O-Ring	0.875	Buna-N (90 durometer)	-30 to +250	1.047 in	0.116	1.279 in
B-920 ORB Fitting/Adapter O-Ring	1.25	Buna-N (90 durometer)	-30 to +250	1.475 in	0.118	1.711 in
B-924 ORB Fitting/Adapter O-Ring	1.5	Buna-N (90 durometer)	-30 to +250	1.72 in	0.118	1.956 in

Product Questions & Answers (4)

Question by: Danny C on Jul 14, 2025, 9:35 PM

trying to replace an o-ring on my SAE o-ring boss fitting, is this the one for 1/4 tube size?

Answer by: Customer Support on Jul 16, 2025, 12:50 PM

For a 0.25 inch tube size SAE O-Ring Boss (straight thread O-ring) fitting or adapter, this one matches that tube size and uses a Buna-N material at 90 durometer. The seal dimensions are 0.351 inch ID, 0.495 inch OD, and 0.072 inch width.

Question by: Ray P on Oct 17, 2025, 7:44 PM

what size o-ring is this exactly, and will it work on a 1/4 inch SAE o-ring boss fitting?

Answer by: Customer Support on Oct 19, 2025, 2:17 PM

For a 1/4 inch SAE O-Ring Boss straight thread fitting, this is the correct size. The o-ring measures 0.351 inches on the inside diameter, 0.495 inches on the outside diameter, and has a width of 0.072 inches. Those dimensions are spec'd for that fitting size, so you're in the right place.

Question by: Duane G on Aug 24, 2025, 8:24 PM

What size o-ring is this, like what size fitting will it work with?

Answer by: Customer Support on Aug 26, 2025, 3:10 PM

It's made for a 0.25 inch SAE O-Ring Boss, which is also sometimes called a straight thread o-ring fitting.

Question by: Hank F on Jun 16, 2025, 6:27 PM

Will this o-ring work with a standard SAE O-ring boss fitting?

Answer by: Customer Support on Jun 18, 2025, 6:22 AM

this O-ring is made specifically for SAE O-ring boss (straight thread O-ring) fittings and adapters.