Tesco Steel & Engineering forges ASTM A105 slip on flanges — the highest-volume flange combination in world piping: the economical slip-on type in the economical carbon steel grade — to ASME B16.5 Class 150–2500 from ½″ to 24″ NB, and AWWA/B16.47 patterns to 80″ NB. Faced SORF or SOFF, supplied bare, hot-dip galvanized or epoxy/FBE coated, with A105N normalized for low-temperature and NACE duty. Ready stock in Class 150/300 common sizes; every flange marked with grade, size, class and heat number, every lot with EN 10204 3.1/3.2 MTC. ISO 9001:2015, made in Mumbai, India — exported to 50+ countries.
ASTM A105 Slip On Flanges — Mixed Sizes, Export Crated at Our Mumbai Works
What is an ASTM A105 Slip On Flange?
A105 + slip-on = the default flange.ASTM A105 is the standard carbon steel for piping forgings — plain chemistry, 485/250 MPa minimums, serviceable −29 °C to +425 °C — and the slip-on is the most economical hubbed type, installed with two fillet welds. Together they carry more joints than any other flange combination on earth: utility racks, water, air, steam tracing, tank farms. Specify by size, class, facing (SORF/SOFF), finish and certification — no pipe schedule needed.
Also searched as: A105 SORF flange, carbon steel slip on flange, MS slip on flange, A105N slip on flange, SA105 slip on flange, galvanized slip on flange — all refer to the product on this page.
ASTM A105 Chemical Composition
C
Mn
Si
P
S
Cu
Ni
Cr
Mo
V
0.35 max
0.60-1.05
0.10-0.35
0.035 max
0.040 max
0.40 max
0.40 max
0.30 max
0.12 max
0.08 max
Values in weight %. Cu, Ni, Cr, Mo and V are residual limits (with combined caps per the standard), not alloy additions — A105 is deliberately plain carbon steel, which is what keeps it weldable with everyday consumables and priced for volume.
ASTM A105 Mechanical Properties
Tensile Strength, MPa (ksi)
Yield Strength, Min, MPa (ksi)
Elongation % min (2")
Reduction of Area % min
Hardness, HB max
485 (70) min
250 (36) min
22
30
187
Demonstrated per heat on the EN 10204 certificate. For NACE MR0175 sour service the working hardness cap is 22 HRC (~237 HB) with normalized supply — order A105N and the certificate carries the normalizing record and hardness survey.
A105 Slip On Flange Specifications
ASTM A105 Slip On Flanges are available in the following specifications:
1/2"NB to 24"NB per ASME B16.5; to 80"NB per ASME B16.47 / AWWA C207
Class
150#, 300#, 400#, 600#, 900#, 1500#, 2500#
Facing
Raised Face (SORF) — process default; Flat Face (SOFF) — waterworks & cast iron mates; serrated stock finish
Temperature Range
−29 °C to +425 °C per ASME B16.5 (below: A350 LF2; above: alloy steel F11/F22)
Finish
Bare (anti-rust oiled), hot-dip galvanized (IS 4759 / ISO 1461), epoxy or FBE coated
Installation
Two fillet welds (hub + bore), pipe set back 1/8"; E7018 / ER70S consumables, no PWHT in normal sizes
Ready Stock
Class 150 & 300, 1/2"–12" NB — dispatch within days
Certification
EN 10204 3.1 (standard) / 3.2 witnessed; NACE MR0175 with hardness survey on request
Equivalent Grades of ASTM A105
Standard
ASME
UNS
EN (working equivalent)
DIN (working equivalent)
ASTM A105
SA105
K03504
P250GH (1.0460)
C22.8
EN/DIN grades are duty equivalents for European PN-series flanges rather than chemistry-identical matches — certificates always state the actual grade forged. System partners: A106/API 5L pipe, A234 WPB fittings, A105 forged fittings.
Why A105 Slip Ons Are the Volume Standard
The Cheapest Reliable Joint
Economical grade × economical type — nothing bolts a Class 150 utility line together for less, and A105's 250 MPa yield still out-muscles the pipe.
Welds With What's on the Truck
E7018 sticks or ER70S wire, no preheat in normal sizes, no PWHT — any coded welder, any site, any weather.
Galvanize It and Forget It
Hot-dip galvanized A105 slip-ons run for decades on water, fire and coastal utility lines — the water industry's everyday hardware.
Ready Stock Where Projects Bite
Class 150/300 in ½″–12″ rotate through stock continuously — shortage-proof for the sizes consumed by the hundred.
Know the Handoffs
Below −29 °C move to A350 LF2; above ~425 °C to alloy steel; severe cyclic or RT-mandated lines to A105 weld necks.
How Our A105 Slip On Flanges Are Manufactured
1
Forging — cut billet of certified A105 heat is hot-forged into the flange blank, keeping full heat traceability from raw material to despatch.
2
Heat treatment — normalizing where ordered (A105N) or required by thickness, with the thermal record retained per heat.
3
Machining — hub, faces and bolt holes to ASME B16.5; the bore machined slightly over pipe OD per the slip-on tolerance.
4
Facing & finish — SORF raised face with serrated stock finish, or SOFF flat face; then anti-rust oil, hot-dip galvanizing or epoxy/FBE as ordered.
5
Testing & marking — mechanical and chemical verification against the heat, hardness survey for NACE lots, then permanent marking of grade, size, class and heat number.
6
Certification & packing — EN 10204 3.1 MTC (3.2 witnessed on request), export-packed as pictured on this page.
Where A105 Slip On Flanges Are Used
Everywhere general-purpose: refinery and petrochemical utility racks, cooling water and firewater rings, compressed air, steam tracing, tank-farm manifolds, municipal water and sewage (galvanized SOFF), HVAC and building services. Our A105 production and packing below:
A105 Flanges — Bulk Wrapped, Stacked for DispatchPolybag-Lined Export Crate — Seaworthy PackingSlip On Flanges — Mixed Sizes, Export Ready
A105 Slip On Flange Dimensions
A105 slip-on dimensions follow the ASME B16.5 slip-on tables — identical for every material. Full charts by class:
Four elements — no bore schedule, since the slip-on bore suits the pipe OD:
1
Size & standard — e.g. 6″ NB ASME B16.5.
2
Pressure class & facing — Class 150–2500, SORF (default) or SOFF for flat-face mates.
3
Condition & finish — A105 or A105N; bare, hot-dip galvanized, epoxy or FBE.
4
Certification & quantity — EN 10204 3.1 or 3.2, NACE MR0175 where sour, quantity and destination — to sales@tescosteel.com or the inquiry form.
Example: “Slip On Flange, 6″ NB, ASME B16.5 Class 150, RF, ASTM A105, EN 10204 3.1 — 100 pcs.” Ready-stock sizes quote with immediate delivery; the rest normally within 24 hours.
ASTM A105 Slip On Flanges — Frequently Asked Questions
What is an ASTM A105 slip on flange?
It is a slip-on flange forged from ASTM A105 — the standard carbon steel grade for piping forgings — dimensioned to ASME B16.5. The flange slides over the pipe end and is secured with two fillet welds, and A105 supplies the strength: 485 MPa tensile / 250 MPa yield minimum, serviceable from -29 °C to about 425 °C. It is the highest-volume flange combination in world piping — the economical type in the economical grade — the default of utility, water and general process lines.
What is the chemical composition of ASTM A105?
Per ASTM A105: carbon 0.35% max, manganese 0.60-1.05%, silicon 0.10-0.35%, phosphorus 0.035% max, sulphur 0.040% max, with residual limits of copper 0.40%, nickel 0.40%, chromium 0.30%, molybdenum 0.12% and vanadium 0.08% (and combined caps on the residuals). It is plain carbon steel — no deliberate alloying — which is exactly why it is economical, weldable and everywhere.
What are the mechanical properties of A105 slip on flanges?
Per ASTM A105: tensile strength 485 MPa (70 ksi) minimum, yield strength 250 MPa (36 ksi) minimum, elongation 22% minimum in 2", reduction of area 30% minimum, and hardness 187 HB maximum. These are demonstrated against each heat on the EN 10204 certificate. The strength matches or exceeds most pipe it bolts into, so the flange is never the weak point of a Class 150/300 joint.
What is the difference between A105 and A105N?
The N is normalizing — a heat treatment that refines the grain and improves toughness and uniformity. Plain A105 needs no mandatory heat treatment in most sizes; A105N is supplied normalized, and specifications call for it where low-temperature toughness, NACE MR0175 sour service or simply better metallurgical consistency is wanted. Tesco supplies either — state A105N on the order and the certificate carries the normalizing record.
What temperature range can A105 slip on flanges handle?
Per ASME B16.5, A105 flanges are rated from -29 °C to +425 °C, with pressure ratings falling as temperature rises — a Class 150 flange rated 285 psi at ambient is down to 200 psi at 260 °C. Below -29 °C, impact-tested LTCS A350 LF2 takes over; above about 425 °C prolonged service risks graphitization of carbon steel, so lines move to alloy steel F11/F22. Within that window, A105 is the economical answer.
Are A105 slip on flanges available galvanized?
Yes — hot-dip galvanizing to IS 4759 / ISO 1461 is one of the most-ordered configurations, serving water supply, firefighting, sewage and coastal utility lines; epoxy and FBE coatings cover buried service. Faces remain serviceable as coated for soft gaskets. Galvanized A105 slip-ons in flat face (SOFF) are the everyday hardware of the water industry; raised face (SORF) dominates process duty bare.
What sizes and classes are A105 slip on flanges stocked in?
Ready stock concentrates where projects consume by the hundred: Class 150 and 300 from ½" to 12" NB, typically available for dispatch within days, with larger sizes and higher classes — B16.5 runs to Class 2500 at 24" NB and AWWA/B16.47 patterns to 80" — forged to order. Every quotation states the stock position alongside price and weight.
How is an A105 slip on flange welded to pipe?
With two fillet welds — hub outside, bore inside — after setting the pipe end back 1/8" (3 mm) from the face, each weld throat at least the pipe wall and not less than 3/16" per ASME B16.5/B31.3. A105 welds with ordinary E7018 or ER70S consumables, no preheat below about 50 mm thickness and no PWHT in normal sizes — the everyday joint every pipe crew knows. On galvanized flanges, weld and re-coat the weld zone.
Is A105 suitable for sour service under NACE MR0175?
Yes, with conditions: NACE MR0175 / ISO 15156 accepts carbon steel forgings like A105 for H2S service subject to a hardness cap of 22 HRC (237 HB) and appropriate heat treatment — which is why sour-service orders typically specify A105N normalized with a hardness survey. State the NACE requirement on the enquiry and the flanges ship in the compliant condition with hardness values on the certificate.
What is the equivalent of ASTM A105 in other standards?
Close working equivalents include EN P250GH (1.0460) and the older DIN C22.8 — the mild carbon steels used for European PN-series flanges — and ASME SA105 is the boiler-code twin of A105 itself. They are equivalent in duty rather than chemistry-identical, so certificates always state the actual grade. For European patterns Tesco forges EN 1092-1 flanges in P250GH or supplies A105 dual-marked where the specification permits.
How much does an A105 slip on flange weigh?
As working approximations: 2" Class 150 about 2 kg, 4" Class 150 about 4 kg, 6" Class 150 about 8 kg, 8" Class 300 about 17 kg, 12" Class 150 about 24 kg, and a 24" Class 300 roughly 150 kg — with galvanizing adding a few percent. The complete size-by-size table is on our Flange Weight Chart page, and every quotation states the exact unit weight.
What details are needed to get an accurate A105 slip on flange quotation?
Four elements plus commercial terms: (1) size and standard — e.g. 6" NB ASME B16.5; (2) pressure class — 150 through 2500; (3) facing and finish — SORF (raised face) or SOFF (flat face), bare, galvanized, epoxy or FBE; (4) grade condition and certification — A105 or A105N, EN 10204 3.1 or 3.2, NACE MR0175 where sour. No pipe schedule is needed for the slip-on bore. Add the quantity and destination and we return price, weight and delivery — often from ready stock.
Who manufactures ASTM A105 slip on flanges in India?
Tesco Steel & Engineering is an ISO 9001:2015 certified flange manufacturer based in Mumbai, India, forging A105 and A105N slip on flanges from ½" to 80" NB — SORF and SOFF, bare or hot-dip galvanized — with Class 150/300 common sizes in ready stock. Every flange is marked with grade, size, class and heat number, ships with EN 10204 3.1/3.2 certification, and exports to more than 50 countries across the Middle East, Europe, Africa, Asia and the Americas.
