Bolton Engineering

& Manufacturing Ltd

t: 0161 790 1365

Spectacle Blinds

Our Services

At Bolton Engineering & Manufacturing Ltd we specialise in fast deliveries and pride ourselves in being able to react quickly to our customer’s unique requirements, with substantial stocks of semi finished flanges & forgings and our flexible well equipped machine shop, we can usually deliver within 72 hours and even same day/next day deliveries are possible when required.


ASME B16.5/ASME B16.47 Series A & B


Bolton Engineering can supply the full range of flanges in classes 150LB to 2500LB


Size Range: 

½” to 60” NB 150LB, 300LB, 600LB

½” to 48” NB 900LB

½” to 24” NB 1500LB

½” to 12” NB 2500LB



ASTM A105, ASTM A350 LF2, ASTM A694 F52


BS EN1092, BS10, BS4504, JIS


Slip-on, Bossed slip-on, Weld neck, Backing flanges & Blank flanges.


Size Range:

15mm to 1000mm NB (larger sizes can be manufactured to order)



ASTM A105, S275JR, A516 60/70, 304L/316L stainless, Duplex UNS S31803


Spectacle blinds,Drip rings, Spades & spacers 


Bolton Engineering specialise in the supply of spectacle blinds/spades & spacers manufactured to API 590, ASTM B16.48  & customer requirements.



ASTM S275JR, A516 60/70, 304L/316L stainless steel, Duplex S31803


Special flanges/Sub-contract machining


Special flanges according to customer drawings, large diameter flanges manufactured to order from stock forgings or sourced from forgings manufactured by our European suppliers.


With our on site machine shop we are happy to machine our customer’s free issue material on a sub contract basis when required.


Other Services/Testing


Ultrasonic Testing, Magnetic Particle Examination, Dye Penetrant Testing, Galvanising & Welding services can be provided if required.


Other material grades/products


We can manufacture flanges, spectacle blinds and spades/spacers in most material grades including ASTM A182 F11/F22, Super Duplex, Nickel Alloys 625/718/825.


Forged bars, blanks, rings & blocks can be supplied in rough machined or black condition in most material grades including BS970 709M40, 817M40, 826M40 & 722M24.

We manufacture to all recognised international standards including BS, ANSI, ASME, DIN, JIS, ISO.

blind flange
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lwn flanges
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Bolton Engineering

& Manufacturing Ltd

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t: 0161 790 1365