ASME B16.5 Slip On Flange Dimension & Weight Chart

In the world of industrial piping, a reliable flange can make all the difference between a secure, leak-free system and one riddled with maintenance headaches. Among the various flange types, the ASME B16.5 Slip On Flange stands out for its cost-effectiveness, ease of installation, and broad compatibility with ASME B16.5 standard systems.

What Is an ASME B16.5 Slip On Flange?

A Slip On Flange (SO flange) is a type of pipe flange that “slips” over the pipe and is then welded both inside and outside to provide strength and prevent leakage. Under the ASME B16.5 standard, this flange design offers simplified fabrication and reduced cost compared to more complex flanges, making it very popular in industrial piping.

ASME B16.5 Slip On Flange Dimension

Below are links to the dimensions of slip-on flanges. Click on the one you need to view.

Class 150 Slip On Flange Dimension

Class 300 Slip On Flange Dimension

Class 400 Slip On Flange Dimension

Class 600 Slip On Flange Dimension

Class 900 Slip On Flange Dimension

Class 1500 Slip On Flange Dimension

Slip On Flanges Weight Chart

Size	150LB	300LB	400LB	600LB	900LB	1500LB	2500LB
1/2	0.45	0.68	0.91	0.91	2.72	2.72	3.18
3/4	0.68	1.14	1.36	1.36	2.72	2.72	4.09
1	0.91	1.36	1.59	1.59	3.41	3.41	5.45
1 1/4	1.14	2.04	2.04	2.04	4.54	4.54	8.17
1 1/2	1.36	2.95	2.95	2.95	6.36	6.36	11.35
2	2.18	3.18	3.63	3.63	9.99	9.99	17.25
2 1/2	3.45	4.54	5.45	5.45	14.07	16.34	24.97
3	4.01	5.90	6.81	6.81	16.34	21.79	37.68
3 1/2	4.99	7.20	9.53	9.53	–	–	–
4	5.63	10.67	10.90	14.98	24.06	33.14	57.66
5	6.74	13.17	14.07	28.60	37.68	59.93	95.34
6	7.90	16.34	17.71	36.32	49.03	74.46	146.64
8	12.90	25.42	28.60	44.04	78.09	117.13	220.19
10	17.60	34.96	41.31	80.36	111.23	197.94	419.95
12	27.69	51.30	58.57	97.61	148.00	302.82	590.20
14	37.68	72.19	86.71	117.59	172.52	–	–
16	48.12	95.34	114.86	166.16	208.39	–	–
18	49.49	114.86	140.74	216.10	293.74	–	–
20	67.19	139.38	171.61	277.85	359.57	–	–
24	92.62	222.46	244.71	397.70	671.92	–	–

Pressure Ratings & Temperature Limits

One of the most important features of ASME B16.5 flanges is the pressure–temperature rating, which ensures safe operation under varying conditions. As per the ASME B16.5-2020 standard, classes include Class 150, 300, 400, 600, 900, 1500, and 2500.

•Class 150: Commonly used in low- to medium-pressure systems.

Balcombe Engineering

•Class 600: For higher pressure applications, with thicker flanges and more robust material design.

The allowable pressure decreases as the temperature increases, following the pressure–temperature chart in the standard. This ensures that the Slip On Flanges remain safe and reliable under elevated temperatures.

Flanges Material Selection

Under ASME B16.5, material selection is crucial both for mechanical strength and corrosion resistance.

•Carbon steel: ASTM A105 / A105N

•low-temperature steel: ASTM A350 LF2 / LF3

•Stainless steel: ASTM A182 F304L / F316L / F904L, etc.

•Duplex stainless steel: ASTM A182 F51, F53, etc.

Flange Face Types: RF, FF, RTJ

Under ASME B16.5, flange facing (facing type) is an essential design factor affecting leak prevention.

•RF (Raised Face): the most common; a raised ring helps concentrate compression on the gasket.

•FF (Flat Face): simpler, often used in low-pressure systems.

•RTJ (Ring Type Joint): contains a metal ring gasket and groove — used in high-pressure, high-temperature, or hydrogen systems.

Slip On Flange vs Weld Neck Flange

Feature	Slip On Flange (SO)	Weld Neck Flange (WN)
Cost	Lower manufacturing cost	Higher cost due to forging and machining
Installation	Easier: slip-on and weld inside & outside	Requires more precise alignment and welding
Stress Distribution	Less ideal: more weld stress	Very good: smooth transition via neck
Leak Risk	Moderate (if welded properly)	Lower risk, especially in high-pressure systems

Applications

•Oil & Gas pipelines (onshore/offshore)

•Petrochemical plants

•Power generation

•Water treatment / desalination

•HVAC systems

Why Choose Our Slip On Flanges Manufacturer?

✔Quality Assurance

✔Material Expertise

✔Competitive Pricing

✔Fast Delivery & OEM Service

✔Inspection & Testing

If you have any requirements for purchasing flanges, please feel free to contact us at any time.

Conclusion

The ASME B16.5 Slip On Flanges stand out as a cost-effective, reliable, and widely compatible solution in modern piping systems.Whether you’re working in oil & gas, petrochemical, power generation, water treatment, or HVAC, choosing the right material (ASTM A105, A182 stainless, duplex, etc.), the correct class (150–2500), and the proper facing (RF / FF / RTJ) can make all the difference. Additionally, proper welding and torque practices ensure leak prevention and long-term reliability.