ASTM A105 Weldolets Specifications

ASTM A105 is the most commonly used standard for carbon steel forgings, therefore ASTM A105 weldolet is widely used in oil and gas, chemical, power plant, and high-temperature, high-pressure systems. The ASTM A105 weldolet standard covers the pressure-temperature rating, material, dimensions, tolerances, marking, testing, and marking methods for openings.

Weldolet belongs to the olets branch fitting category, and its standards mainly follow:

MSS-SP 97 (General Standard for Olet Fittings);

ASME B31.1 / B31.3 (Pipeline Engineering);

ASTM A105 / A182 / A350 and other material standards.

Specifications of ASTM A105 Weldolets

Size : 1/2'' - 24

Type : Weldolet 

Pressure Rating: 3000# / 6000# (depending on material and wall thickness)

Structure Type: Equal weldolet, reducing weldolet

Materials :
SS Weldolets: ASTM A182 F304, 304H, 309, 310, 316, 316L, 317L, 321, 347, 904L 

Duplex SS Weldolets: ASTM / ASME A/SA 182 UNS F 44, F 45, F51, F 53, F 55, F 60, F 61.

CS Weldolets: ASTM / ASME A/SA 105 / 350 LF 2 / A 516 GR.70 / IS 2062

AS Weldolets: Standard : ASTM / ASME A/SA 182 / A 387; Grade : F5, F9, F11, F12, F22, F91.
Nickel Alloy Weldolets: Standard : ASTM / ASME SB 564 / 160 / 472; Grade : UNS 2200 (NICKEL 200), UNS 4400 (MONEL 400), UNS 8825 INCONEL (825), UNS 6600 (INCONEL 600), UNS 6601 (INCONEL 601), UNS 6625 (INCONEL 625), UNS 10276 (HASTELLOY C 276), UNS 2201 (NICKEL 201), (ALLOY 20 / 20 CB 3)

Copper Alloy Weldolets: Standard : ASTM / ASME SB 61 / 62 / 151 / 152; Grade : UNS NO. C 92200, UNS NO. C 83600, UNS NO. 70600, 71500, C 70600 (CU -NI- 90/10), C 71500 (CU -NI- 70/30), UNS NO C 10100, C 10200, C 10300, C 10800, C 12000, C 12200

Value Added Services: Hot dip galvanizing, Electro polish

Test Certificate: Mill Test Certificate as per EN 10204 / 3.1B

Dimensions of ASTM A105 Weldolets

Outlet Nominal Pipe Size	Face to Crotch (L)
	Standard (SCH40S)		XS (SCH80S)		SCH160
	Réduit	Egal	Réduit	Egal	Réduit	Egal
1/8"	16	-	16	-	-	-
1/4"	16	-	16	-	-	-
3/8"	16	-	19	-	-	-
1/2"	19	19	19	19	28	28
3/4"	22	22	22	22	32	32
1"	27	27	27	27	38	38
1 1/4"	32	32	32	30	44	44
1 1/2"	33	33	33	32	51	51
2"	38	38	38	38	55	55
2 1/2"	41	41	41	41	62	62
3"	44	44	44	44	73	73
3 1/2"	48	51	48	51	-	-
4"	51	51	51	51	84	84
5"	57	57	57	57	94	94
6"	60	60	78	78	105	105
8"	70	70	99	99	-	-
10"	78	78	94	89	-	-
12"	86	86	103	100	-	-
14"	89	89	100	105	-	-
16"	94	94	106	113	-	-
18"	97	103	111	119	-	-
20"	102	117	119	127	-	-
24"	116	137	140	140	-	-

Production of ASTM A105 Weldolet

1. Raw Material Inspection

Raw materials must meet the chemical composition and mechanical property requirements of ASTM A105.

Each batch of materials must undergo:

PMI material spectral analysis;

Tensile/impact testing;

Dimensional and visual inspection.

2. Hot Forging

Heating to 900°C–1250°C;

Die forging or free forging;

Controlling grain refinement to improve mechanical strength.

3. Heat Treatment (Normalizing/Quenching & Tempering)

Ensuring hardness, strength, and ductility meet standards.

4. Machining (CNC Lathe)

Precision machining of branch pipe dimensions;

Ensuring the weld bevel matches the main pipe.

5. Surface Treatment

Rust-proofing oiling, galvanizing, electropolishing, etc.

6. Marking

Free marking according to customer requirements:

Material: A105 / A182 / LF2, etc.;

Dimensions;

Pressure rating;

Standard: ASME B16.11 / MSS-SP 97;

Heat No.

FAQ

1. Can weldolets be used in sour service (H2S)?

Yes, if using NACE MR0175 compliant materials, such as LF2, F22, Monel 400, Inconel 625.

2. Which standard covers weldolet?

MSS-SP 97 is the main standard

ASME B16.11 covers forging requirements for the material.

Summary

ASTM A105 weldolets are the most commonly used forged carbon steel branch fittings in oil and gas, chemical, and high-pressure pipeline systems. With their high strength, reliable weldability, and wide range of material options (stainless steel, duplex steel, nickel-based alloys, copper alloys, etc.), they are suitable for various pressure and corrosive conditions.