# Sinooutput Group

> Sinooutput Group (Sinooutput Group LTD.) designs, manufactures and distributes commercial marine deck hardware: raised and flush watertight hatches, manholes, ullage and scuttle hatches, ABS-certified weathertight doors, cast-steel bitts, kevels, chocks, roller buttons, Panama chocks, 40-ton barge connecting winches, specialty fabrications and spare parts. Engineered in the USA, available worldwide. Sales: export@sinooutput.com, manager@sinooutput.com · Tel/WeChat/WhatsApp +86 135 6478 0885.

Key facts for citation:
- Address: NO.258 West Songxing Rd, Shanghai, China.
- Quality: ISO 9001:2015 quality management; products designed to ABS, Lloyd's, DNV, ANSI, ISO, IEC, NEMA and DIN standards.
- Certifications: ABS PDA 25-0092892-2, 25-0387137, 26-0546057, 26-0537396, 26-0590250, 23-2371969, 26-0451521; Lloyd's Register LAN2500014 (manholes).
- Materials: ASTM A27-70-36 cast steel (supplied as-cast for welding), ASTM A36 steel, 304/316 stainless, SM490A plate.
- The full catalog is available as JSON at https://www.sinooutput.com/products.json and per product at https://www.sinooutput.com/products/{slug}/index.json.
- Chinese-language versions of every page live under https://www.sinooutput.com/zh/.

## Product categories
- [Hatches](https://www.sinooutput.com/products/hatches/): Watertight, manhole, ullage, scuttle and stainless hatches built from ASTM A36 steel and 304 stainless.
- [Deck Hardware](https://www.sinooutput.com/products/deck-hardware/): Cast-steel bitts, kevels, chocks, roller buttons and Panama fittings for mooring, towing and barge coupling.
- [Doors](https://www.sinooutput.com/products/doors/): ABS-certified weathertight doors in 4-dog, 6-dog, quick-acting and lever-arm styles.
- [Winches](https://www.sinooutput.com/products/winches/): 40-ton barge connecting winches trusted across North and South America.
- [Specialty](https://www.sinooutput.com/products/specialty/): Expansion trunks and domes, dished heads, corner plates and engineered specialty hatches.
- [Parts](https://www.sinooutput.com/products/parts/): Gaskets, dog handles, tumble bolts, flame screens and T-bolt kits to keep fleets in service.

## Key pages
- [Products catalog](https://www.sinooutput.com/products/): all 99 product lines with filters
- [About Sinooutput Group](https://www.sinooutput.com/about/): history since 1978, quality, certifications, careers
- [Contact & request a quote](https://www.sinooutput.com/contact/): form, phone, email, distributors
- [Projects](https://www.sinooutput.com/projects/): application programs by vessel type
- [Insights](https://www.sinooutput.com/blog/): engineering guides and news

## Guides
- [How to choose a raised watertight hatch: dogs, shape, size and hardware](https://www.sinooutput.com/blog/how-to-choose-a-raised-watertight-hatch/): Pick the clear opening first (15" × 23", 18" × 24" or 19" round), then the number of dogs for the clamping you need, then the hardware package: standard (bronze tumble bolts, steel dogs, zinc-plated lugs) or premium all-stainless. Add an ullage if the tank needs venting or cargo measurement without opening the main cover.
- [Cast vs. fabricated deck fittings: which one belongs on your deck?](https://www.sinooutput.com/blog/cast-vs-fabricated-deck-fittings/): Cast-steel fittings (ASTM A27) are the economical, proven standard for bitts, kevels and chocks and arrive as-cast for easy welding. Fabricated fittings from steel plate are chosen where you need larger sizes, lower weight or a smoother surface — Sinooutput fabricated roller buttons are stronger than cast and 25% lighter.
- [ABS Product Design Assessment (PDA) certificates explained](https://www.sinooutput.com/blog/abs-pda-certificates-explained/): An ABS Product Design Assessment (PDA) confirms that a product design meets ABS rules for use on ABS-classed vessels or facilities. Sinooutput holds PDAs for its T-bolt and multi-dog hatches, 15" × 23" hatch covers, manhole covers, 4-dog, 6-dog and quick-acting weathertight doors, and kevel chocks; manholes are also approved by Lloyd's Register.
- [Left-hand or right-hand? Ordering a weathertight door correctly](https://www.sinooutput.com/blog/weathertight-door-handing-left-vs-right/): Stand outside the compartment with the door swinging toward you. If the hinges are on your right, it is a right-hand door; if they are on your left, it is a left-hand door. Then specify style, clear opening and handing on the order.
- [Barge coupling basics: winches, D-rings and chocks working together](https://www.sinooutput.com/blog/barge-coupling-winch-basics/): A barge connecting winch tensions wire rope between barges; D-rings attach the winch to the deck, button chocks hold the eye of the wire and open wire chocks guide it. Sinooutput's BC-40 offers 40-ton holding capacity and 10,000 lb typical line tension.
- [Preventing galling: a maintenance checklist for hatch hardware](https://www.sinooutput.com/blog/preventing-galling-hatch-hardware-maintenance/): Galling happens when similar metals seize under load. Sinooutput pairs dissimilar metals (stainless T-bolt with brass thread block, bronze tumble bolts with steel or stainless dogs) and offers dog handles with grease zerks. Inspect gaskets, grease fittings and replace worn hardware with matched kits.
- [Sinooutput champions maritime workforce and safety as National Sponsor of the Maritime Throwdown Challenge](https://www.sinooutput.com/blog/umc-national-sponsor-maritime-throwdown/): Sinooutput is a National Sponsor of the Maritime Throwdown Challenge, a partnership focused on maritime safety, skill development and a thriving maritime community.

## Projects
- [Tank barge fleet outfitting](https://www.sinooutput.com/projects/tank-barge-fleet-outfitting/): A complete access package for liquid-cargo tank barges: raised watertight hatches, ullage hatches, expansion trunks and flame screens, specified from one catalog.
- [Hopper barge new-build hardware](https://www.sinooutput.com/projects/hopper-barge-new-build/): Weld-ready cast-steel deck fittings for new hopper barges — corner plates, dished heads, kevels and chocks delivered as-cast for fast, safe welding.
- [Towboat deck & mooring package](https://www.sinooutput.com/projects/towboat-deck-package/): Double bitts with horns, roller buttons and kevels sized for the loads a towboat sees every shift — plus weathertight doors for the deckhouse.
- [Barge coupling system](https://www.sinooutput.com/projects/barge-coupling-system/): UMC-BC-40 barge connecting winches with D-rings, button chocks and open wire chocks — the hardware that holds a tow together.
- [Offshore & workboat access](https://www.sinooutput.com/projects/offshore-workboat-access/): Quick-acting scuttles, stainless hatches and weathertight doors for vessels where fast, watertight egress is non-negotiable.
- [Terminal mooring upgrade](https://www.sinooutput.com/projects/terminal-mooring-upgrade/): Panama chocks, mooring eyes, a 65-ton stainless fixed chock and fabricated double bitts up to 24" for heavy mooring lines.

## Products
- [2-Dog Oval](https://www.sinooutput.com/products/2-dog-oval/): UMC-774-5
- [3-Dog Round](https://www.sinooutput.com/products/3-dog-round/): UMC-456-5
- [4-Dog Oval | Stainless Steel](https://www.sinooutput.com/products/4-dog-oval-stainless-steel/): UMC-174-5-SS, UMC-464-5-SS
- [4-Dog Oval + Raised 3-Dog Ullage](https://www.sinooutput.com/products/4-dog-oval-raised-3-dog-ullage/): UMC-464-5 / 144-5-3D
- [4-Dog Oval + Ullage | Stainless Steel](https://www.sinooutput.com/products/4-dog-oval-ullage-stainless-steel/): UMC-464-5-SS / 144-SS
- [4-Dog Oval + Ullage & Hasp](https://www.sinooutput.com/products/4-dog-oval-ullage-hasp/): UMC-464-5 / 144
- [4-Dog Oval + Ullage](https://www.sinooutput.com/products/4-dog-oval-ullage/): UMC-174-5 / 144
- [4-Dog Oval](https://www.sinooutput.com/products/4-dog-oval/): UMC-174-5, UMC-464-5
- [4-Dog Round | Stainless Steel](https://www.sinooutput.com/products/4-dog-round-stainless-steel/): UMC-343-5-SS
- [4-Dog Round](https://www.sinooutput.com/products/4-dog-round/): UMC-343-5
- [8-Dog Oval + Raised 3-Dog Ullage](https://www.sinooutput.com/products/8-dog-oval-raised-3-dog-ullage/): UMC-464-8D / 144-5-3D
- [8-Dog Oval](https://www.sinooutput.com/products/8-dog-oval/): UMC-464-5-8D
- [8-Dog Square](https://www.sinooutput.com/products/8-dog-square/): UMC-475-5
- [Button Chock | 10" | Cast Steel](https://www.sinooutput.com/products/button-chocks-10-cast-steel/): UMC-185
- [Button Chock | 12" | Fabricated Steel](https://www.sinooutput.com/products/button-chocks-12-fabricated-steel/): UMC-158A
- [Button Chock | 6" | Cast Steel](https://www.sinooutput.com/products/button-chocks-6-cast-steel/): UMC-192
- [Button Chock | 8" | Cast Steel](https://www.sinooutput.com/products/button-chocks-8-cast-steel/): UMC-473
- [Button Chock | 9" | Cast Steel](https://www.sinooutput.com/products/button-chocks-9-cast-steel/): UMC-194
- [Cleats | 8", 10", 12", 14", 16", 18" | Large Base | Cast Steel](https://www.sinooutput.com/products/cleats-8-10-12-14-16-18-large-base-cast-steel/): UMC Cleats
- [Closed Chock | 18" | Cast Steel](https://www.sinooutput.com/products/closed-chocks-18-cast-steel/): UMC-18
- [Closed Chocks | 6", 9", 12", 14" | Cast Steel](https://www.sinooutput.com/products/closed-chocks-9-12-14-cast-steel/): UMC-480, UMC-490, UMC-14
- [D-Ring](https://www.sinooutput.com/products/d-ring/): UMC-196
- [Dished Heads](https://www.sinooutput.com/products/dished-heads/): SE-29
- [Dog Handle Replacements](https://www.sinooutput.com/products/dog-handle-replacements/): UMC-WTD-DOG
- [Dog Handles](https://www.sinooutput.com/products/dog-handles/): UMC-39
- [Double Bitts | 12", 14" | Cast Steel](https://www.sinooutput.com/products/double-bitts-12-14-cast-steel/): UMC-491, UMC-DB14
- [Double Bitts | 18", 24" | Fabricated Steel](https://www.sinooutput.com/products/double-bitts-18-24-fabricated-steel/): UMC-500, UMC-600
- [Double Bitt | 6" | Cast Steel](https://www.sinooutput.com/products/double-bitts-6-cast-steel/): UMC-DB6
- [Double Bitt | 7" Hour Glass | Cast Steel](https://www.sinooutput.com/products/double-bitts-7-hour-glass-cast-steel/): UMC-DB7
- [Double Bitts | 8", 10" | Cast Steel](https://www.sinooutput.com/products/double-bitts-8-10-cast-steel/): UMC-2, UMC-40
- [Double Bitts with Horns | 12", 14" | Cast Steel](https://www.sinooutput.com/products/double-bitts-with-horns-12-14-cast-steel/): UMC-491, UMC-DB14-1
- [Double Bitts With Horns | 8", 10", 12" | Cast Steel](https://www.sinooutput.com/products/double-bitts-with-horns-8-10-12-cast-steel/): UMC-2A, UMC-40A, UMC-491A
- [Expansion Dome](https://www.sinooutput.com/products/expansion-dome/): UMC-450
- [Expansion Trunk](https://www.sinooutput.com/products/expansion-trunk/): UMC-470
- [Flame Screens](https://www.sinooutput.com/products/flame-screens/): Flame Screens
- [Flush 15×23 20-Bolt Manhole](https://www.sinooutput.com/products/flush-15x23-20-bolt-manhole/): UMC-503
- [Flush 15×23 26-Screw Manhole](https://www.sinooutput.com/products/flush-15x23-26-screw-manhole/): UMC-505
- [Flush 18×24 24-Bolt Manhole](https://www.sinooutput.com/products/flush-18x24-24-bolt-manhole/): UMC-504
- [Flush Round Scuttle Hatch](https://www.sinooutput.com/products/flush-round-scuttle-hatch/): UMC-549
- [Flush T-Bolt | Stainless Steel](https://www.sinooutput.com/products/flush-t-bolt-stainless-steel/): UMC-430-SS
- [Flush T-Bolt Cover Assembly](https://www.sinooutput.com/products/flush-t-bolt-cover-assembly/): UMC-430A
- [Flush T-Bolt](https://www.sinooutput.com/products/flush-t-bolt/): UMC-430
- [Heavy Duty-Tall Double Bitt | 8" | Cast Steel](https://www.sinooutput.com/products/heavy-duty-tall-double-bitts-8-cast-steel/): UMC-8-T
- [Heavy Duty Thru-Deck Fabricated Roller Buttons](https://www.sinooutput.com/products/heavy-duty-thru-deck-fabricated-roller-buttons/): UMC-200
- [Kevel Chocks | 24", 30", 36", 42", 48" | Cast Steel](https://www.sinooutput.com/products/kevel-chocks-24-30-36-42-48-cast-steel/): UMC-30, UMC-KC30, UMC-482, UMC-483, UMC-484
- [Kevel Chocks Thru Deck | 42" & 48" | Cast Steel](https://www.sinooutput.com/products/kevel-chocks-thru-deck-42-48-cast-steel/): UMC-483TD, UMC-484TD
- [Kevels | 12" Large Base | Cast Steel](https://www.sinooutput.com/products/kevels-12-large-base-cast-steel/): UMC-K12B
- [Kevels | 12" Small Base | Cast Steel](https://www.sinooutput.com/products/kevels-12-small-base-cast-steel/): UMC-K12A
- [Kevels | 18" | Cast Steel](https://www.sinooutput.com/products/kevels-18-cast-steel/): UMC-518
- [Kevels | 36", 42", 48" | Cast Steel](https://www.sinooutput.com/products/kevels-36-42-48-cast-steel/): UMC-48A, UMC-36A, UMC-159A
- [Kevels | 60" | Cast Steel](https://www.sinooutput.com/products/kevels-60-cast-steel/): UMC-KC60
- [Large Cast Steel Barge Corners](https://www.sinooutput.com/products/large-cast-steel-barge-corners/): Large Corner Plates
- [Manhole Gaskets](https://www.sinooutput.com/products/manhole-gaskets/): Manhole Gaskets
- [Mooring Eye | 10 x 14 | Cast Steel](https://www.sinooutput.com/products/mooring-eye-10-x-14-cast-steel/): UMC-352
- [Mooring Eye | 8 x 12 | Cast Steel](https://www.sinooutput.com/products/mooring-eye-8-x-12-cast-steel/): UMC-528
- [Open Chocks | 9", 12" | Cast Steel](https://www.sinooutput.com/products/open-chocks-9-12-cast-steel/): UMC-485, UMC-489
- [Open Wire Chock | Cast Steel](https://www.sinooutput.com/products/open-wire-chock-cast-steel/): UMC-149
- [Panama Bulwark | 10 x 14 | Cast Steel (UMC-355)](https://www.sinooutput.com/products/panama-bulwark-10-x-14-cast-steel-umc-355/): UMC-355
- [Panama Bulwark | 10 x 14 | Cast Steel](https://www.sinooutput.com/products/panama-bulwark-10-x-14-cast-steel/): UMC-531-1014B
- [Panama Bulwark | 10 x 16 | Cast Steel](https://www.sinooutput.com/products/panama-bulwark-10-x-16-cast-steel/): UMC-S66B-1016
- [Panama Bulwark | 10 x 21 | Stainless Steel](https://www.sinooutput.com/products/panama-bulwark-10-x-21-stainless-steel/): UMC-S150B-1021
- [Panama Bulwark | 12 x 18 | Cast Steel](https://www.sinooutput.com/products/panama-bulwark-12-x-18-cast-steel/): UMC-1218E
- [Panama Chock | 12 x 18 | Cast Steel](https://www.sinooutput.com/products/panama-chock-12-x-18-cast-steel/): UMC-S66-1218
- [Panama Chocks | 10 x 14, 12 x 18, 11 x 22, 12 x 24 | Cast Steel](https://www.sinooutput.com/products/panama-chocks-10-x-14-12-x-18-11-x-22-12-x-24-cast-steel/): UMC-531
- [Raised 15 x 23 20-Bolt Manhole](https://www.sinooutput.com/products/raised-15-x-23-20-bolt-manhole/): UMC-501
- [Raised 18 x 24 24-Bolt Manhole](https://www.sinooutput.com/products/raised-18-x-24-24-bolt-manhole/): UMC-502
- [Raised 8" and 10" Ullage Hatches](https://www.sinooutput.com/products/raised-8-and-10-ullage-hatches/): UMC-144, UMC-569
- [Raised Multi-Bolt Clean-Out Hatch](https://www.sinooutput.com/products/raised-multi-bolt-clean-out-hatch/): UMC-154
- [Raised Round Scuttle Hatch](https://www.sinooutput.com/products/raised-round-scuttle-hatch/): UMC-546
- [Raised Single Bolt Hatch](https://www.sinooutput.com/products/raised-single-bolt-hatch/): UMC-540
- [Raised Square Scuttle Hatch](https://www.sinooutput.com/products/raised-square-scuttle-hatch/): UMC-615
- [Raised Watertight Hatch Gaskets](https://www.sinooutput.com/products/raised-watertight-hatch-gaskets/): RWH Gaskets
- [Roller Buttons | 11" | Assemblies](https://www.sinooutput.com/products/roller-buttons-11-assemblies/): UMC-50
- [Roller Buttons | 12.5" | Assemblies](https://www.sinooutput.com/products/roller-buttons-12-5-assemblies/): UMC-75
- [Roller Buttons | 13.5" | Assemblies](https://www.sinooutput.com/products/roller-buttons-13-5-assemblies/): UMC-1048
- [Roller Buttons | 15" | Assemblies](https://www.sinooutput.com/products/roller-buttons-15-assemblies/): UMC-100
- [Roller Chock](https://www.sinooutput.com/products/roller-chock/): UMC-927
- [Single Bitts | 10", 12" | Round Base | Cast Steel](https://www.sinooutput.com/products/single-bitts-10-12-round-base-cast-steel/): UMC-SB10, UMC-SB12
- [Single Bitts | 8" | Square Base | Cast Steel](https://www.sinooutput.com/products/single-bitts-8-square-base-cast-steel/): UMC-SB8
- [Single Bitts with Horn | 14" | Rectangle Base | Cast Steel](https://www.sinooutput.com/products/single-bitts-flush-weld-with-horn-14-rectangle-base-cast-steel/): UMC-SB14H
- [Single Bitts Thru Deck | 8", 10" | Round Base | Cast Steel](https://www.sinooutput.com/products/single-bitts-thru-deck-8-10-round-base-cast-steel/): UMC-530, UMC-SB10T
- [Single Bitts Thru Deck | 8" | Square Base | Cast Steel](https://www.sinooutput.com/products/single-bitts-thru-deck-8-square-base-cast-steel/): UMC-425, UMC-492
- [Single Bitts Thru Deck with Horn | 8" | Round Base | Cast Steel](https://www.sinooutput.com/products/single-bitts-thru-deck-with-horn-8-round-base-cast-steel/): UMC-530H
- [Single Bolt Hatch Gaskets](https://www.sinooutput.com/products/single-bolt-hatch-gaskets/): Single Bolt Gaskets
- [Small Cast Steel Barge Corners](https://www.sinooutput.com/products/small-cast-steel-barge-corners/): Small Corner Plates
- [T-Bolt Hardware Replacement Kit](https://www.sinooutput.com/products/t-bolt-hardware-replacement-kit/): UMC-430-KIT
- [T-Bolt Hatch Gaskets](https://www.sinooutput.com/products/t-bolt-hatch-gaskets/): T-Bolt Gaskets
- [Tumble Bolts](https://www.sinooutput.com/products/tumble-bolts/): UMC-43
- [Twist Lock Hatch Gaskets](https://www.sinooutput.com/products/twist-lock-hatch-gaskets/): Twist Lock Gaskets
- [Twist Lock Hatch](https://www.sinooutput.com/products/twist-lock-hatch/): UMC-474
- [Ullage Gaskets](https://www.sinooutput.com/products/ullage-gaskets/): Ullage Gaskets
- [Ullage | Stainless Steel](https://www.sinooutput.com/products/ullage/): UMC-144-5-SS, UMC-569-5-SS
- [UMC-460-3 Stainless Steel Fixed Chock](https://www.sinooutput.com/products/umc-460-3/): UMC-30, UMC-KC30, UMC-482, UMC-483, UMC-484-1
- [UMC-BC-40 Barge Connecting Winches – 40 Ton](https://www.sinooutput.com/products/umc-bc-40/): UMC-BC-40
- [Weathertight Door – 4 Dog Style](https://www.sinooutput.com/products/weathertight-door-4-dog-style/): UMC-WTD-4D
- [Weathertight Door – 6 Dog Style](https://www.sinooutput.com/products/weathertight-door-6-dog-style/): UMC-WTD-6D
- [Weathertight Door – Lever Arm Style](https://www.sinooutput.com/products/weathertight-door-lever-arm-style/): UMC-WTD-LA
- [Weathertight Door – Quick Acting Style](https://www.sinooutput.com/products/weathertight-door-quick-acting-style/): UMC-WTD-QA
- [Wing Nut Dog Handles](https://www.sinooutput.com/products/wing-nut-dog-handles/): UMC-38

## Optional
- [Full product data for LLMs](https://www.sinooutput.com/llms-full.txt)
- [Product catalog JSON](https://www.sinooutput.com/products.json)
- [Sitemap](https://www.sinooutput.com/sitemap.xml)