Threaded Flange

Threaded Flange

What is Threaded Flange?

We offer carbon steel, stainless steel, alloy steel and special steels as per drawings or customer specifications, specially used in the oil & gas, petrochemical and processing industries.All kinds of stainless steel Threaded flanges are easily purchased under single roof named as Spire Industrial Equipments Co. Our stainless steel flanges are 100% free from any corrosion attack assuring their longevity. In addition ton this, our stainless steel flanges are universally appreciated for their high level of strength. We have a team of trained technocrats having immense experience in bringing superior quality stainless steel plate flange


We are an ISO 9001:2008,ISO 9001-2008, ISO 14001-2004, OHSAS 18001-2007, NSIC-CRISIL, EEPC, and QA-UKAS (ISO 9001-2008), SSI Certified company that follows total Quality Management System. and have been recognized as one of the world’s leading stockists and manufacturer of quality metals for over two decades and are committed to quick responses, unsurpassed quality, competitive pricing, reliable deliveries and an exhaustive inventory.

Threaded Flanges Specification

TypeSpectacle Blind Flange
StandardsANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
Outside Diameter≤ 24 = 1.6 mm
> 24 = ± 3.2 mm
Inside Diameter≤ 10 = ± 0.8 mm
> 12 = + 1.6 mm / - 0 mm
Diameter Contact Face1.6 mm RF = ±0.8 mm
6.35 mm RF = ±0.4 mm
Tongue & Groove = ±0.4 mm
Male-Female = ±0.4 mm
Outside Diameter of Hub≤12 = + 2.4 mm/ - 1.6 mm
≥ 14 = ± 3.2 mm
Diameter of CounterboreSame as for Inside Diameter
DrillingBolt Circle = 1.6 mm
Bolt Hole Spacing = ±0.8 mm

Eccentricity Bolt Circle with Respect to Facing
≤2.1/2 = 0.8 mm max
≥3 = 1.6 mm max
Thickness≤18 = +3.2 mm / -0
≥20 = +4.8 mm / -0
Length thru Hub≤18 = 3.2 mm / - 0.8 mm
≥20 = + 4.8 mm / - 1.6 mm
Pressure Ratings:Class 150, Class 300, Class 400, Class 600, Class 900, Class1500, Class 2500 | PN6, PN10, PN16, PN25, PN40, PN64 etc.
OrderAccept custom order
Quality Assurance

All fittings and flanges are subject to strict inspection at each stage of the production process, from starting material purchasing to product dispatch. They are visually examined for conformity to ASTM, ASME, MSS, DIN, EN, and JIS codes and standards. Upon request, official certified Inspection Agencies can be called in to witness the material reports, dimensions and quality conformity of products.

Marking & Packing

Products are packaged to ensure that there is no damage during transit. In case of exports, standard export packaging is done in wooden cases. All buttweld fittings are marked with Grade, Lot No, Size, Degree and our trade mark. On special requests we can also, make custom marking on our products.#Protected by End Caps.

Value Added Services
  • Hot Dipped Galvanizing
  • CNC Machining
  • Customised Flanges
Test CertificatesManufacturer Test Certificate as per EN 10204 / 3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report

Threaded Flanges are used for special circumstances with their main advantage being that they can be attached to the pipe without welding. Sometimes a seal weld is also used in conjunction with the threaded connection. Although still available in most sizes and pressure ratings, screwed fittings today are used almost exclusively in smaller pipe sizes.

A threaded flange or fitting is not suitable for a pipe system with thin wall thickness, because cutting thread on a pipe is not possible. Thus, thicker wall thickness must be chosen...what is thicker?

ASME B31.3 Piping Guide says:
Where steel pipe is threaded and used for steam service above 250 psi or for water service above 100 psi with water temperatures above 220° F, the pipe shall be seamless and have a thickness at least equal to schedule 80 of ASME B36.10.

Carbon Steel Lap Joint Flanges:ASTM A105/A105N, A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, A694 F42, F46, F48, F50, F52, F56, F60, F65, F70, A516.60, 65, 70 (Spectacle Blind Flange, Spacer Ring/Spade Flange), Steel RST37.2, C22.8
Stainless Steel Lap Joint Flanges:ASTM A182 F202, F304/304L/304H, F316/316L, F316H, F316TI, F310, F321, F904L
Alloy Steel Lap Joint Flanges:ASTM A182 F1, F5, F9, F11, F22, F91
Special Alloy Lap Joint Flanges:Duplex, Super Duplex, Nickel Alloys
Flange Face Type:Weld neck Flate Face (WNFF), Weld neck Raised Face (WNRF), Weld neck Ring Type Joint (WNRTJ)
Coating/Surface Treatment:Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized