A-Frame Trailer Couplers With SAE
Trailer A-frame steel plate and forged couplers with SAE certificate
When conditions get tough, MASTERVIM keeps you towing with confidence. Built to perform in snow, mud and rough terrain, our trailer jacks, couplers, safety chains, chocks and straps ensure every connection stays secure when it matters most.
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Trailer A-frame steel plate and forged couplers with SAE certificate

Mastervim adjustable trailer couplers, fixed with 2 bolts mounting, adjust the height easier and pinhole also allows lock function, adopted new qualified casting material, warranty 24 months.

1.98″ used for 4 and 5 lugs hub, 2.441″ used for 6 lugs hub, 2.717″ used for 8 lugs hub.
Bearing buddies could make it clean, also keep grease from flowing trailer wheels.


Mastervim forging axle castle nuts used for truck semi-trailer axle spindles, thread pattern 2.625″-16UN

MASTERVIM hubcaps when you use 3 types of hubs: Grease/ EZ lube/ Oil type Grease hubs: Traditional, need periodic grease repacking. EZ lube hubs: Built-in grease fitting for easy greasing. Oil-type hubs: Use oil to reduce friction and heat; need frequent leak checks. Ref. # Tread Plug Application Components ST2875-AM 21-35, RG04-230 2-7/8”12UN 1/8”-27 NPTF…

Mastervim developed Aluminum Hitch Receiver Balls Assembly for top grade market that used for luxury car trailers.

Mastervim produces over 24 series boat propellers.
Mainly 3 blades and short neck, long neck optional, high strictly produce status, dia. error within 1mm.

Trailer hitch ball used for towing trailers, commonly worked with hitch couplers and hitch receiver.
Hitch ball belongs to forging products, heating to 700℃ and punch by press machine, then harden processing, fine machining, chrome.

The trailer jockey wheel and trailer jack are used to stand part of the trailer weight when parking.




MASTERVIM lights with ISO9001-2015 systems, application for trucks, trailers, boats, motorbikes, and reflective devices.
Based on market requirements, approved SAE, DOT, E-MARK, EN13356, AS certificates, products included trail, stop, turn, No. plate, reflector, flowing turn signal etc.

Mastervim winch used for salt environment and common land using, winch equipped with strong gear and thick box.
We will contact you within 1 working day, please pay attention to the email with the suffix “@mastervim.com”.