Heavy-duty hydraulic connections for construction, mining, and truck equipment. The Breco B-6610-16-16 is a steel 1″ plug conforming to ISO 7241-1 Series A, with a SAE straight-thread O-ring boss port. Two-way shut-off with poppet valves and a ball-locking sleeve, rated to 4000 PSI. (Also known as the 6600 Series.)
Performance & Construction
| Interface | Conforms with ISO 7241-1, Series A |
| Rated Pressure | 4000 PSI (coupled) |
| Valve | Two-way shut-off, poppet valves with solid metal perch |
| Locking | Ball-locking sleeve, case hardened to resist brinelling and shock |
| End Connection | 15/16″-12 ORB |
| Temperature Range | -10F to +250F (standard seals) |
| Construction | Steel |
| Quantity | 1 pc |
| Origin | Made in USA |
Why this plug
- ISO-A interchange — conforms to ISO 7241-1 Series A and mates with any Series A half of the same body size.
- Two-way shut-off — poppet valves seal both halves at disconnect, preventing fluid loss and air inclusion.
- Case-hardened ball-locking sleeve — resists brinelling and shock in demanding service.
- SAE straight-thread port — O-ring boss seal, no thread sealant required.
- Rated to 4000 PSI — built for construction, mining, dump truck, and snow-plow hydraulics.
Frequently asked questions
Are these ISO-A couplers?
Yes — the 6600 Series conforms to ISO 7241-1, Series A. It mates with any Series A half of the same body size, from any manufacturer.
What coupler does it take?
Any 1 coupler on the same ISO-B interface in matching steel. The matching Breco coupler is B-6601-16-16.
Can I connect it under pressure?
No. Relieve system pressure before connecting or disconnecting.
Is ISO-A the same as ISO-B?
No. ISO 7241-1 Series A and Series B are different interfaces and do not intermate. Match the series and the body size.
Why buy from hpcouplers: Breco quality, responsive US-based support, accurate specs, fast shipping.
ISO-A Series (ISO 7241-1 Series A) — Complete Series Chart
The size you are viewing is shown first, with the rest of the series below. Base couplings appear before ball lock and seal options. Dust caps and plugs fit by body size and are labeled by which half they protect. Click any part number to open that product.
| Coupler | Brand | Plug | Dust Cap/Plug |
Body Size |
Thread | Description |
|---|---|---|---|---|---|---|
| 1″ Body — Your Size | ||||||
| B‑6601‑16‑16 | Breco | B‑6602‑16‑16 | A16DC‑DP (For Coupler or Plug) B‑6657‑16 (For Coupler) B‑6659‑16 (For Plug) |
1″ | 1″ | Steel |
| B‑6608‑16‑16 | Breco | B‑6602‑16‑16 | A16DC‑DP (For Coupler or Plug) B‑6657‑16 (For Coupler) B‑6659‑16 (For Plug) |
1″ | 1″ | Steel |
| 1/4″ Body | ||||||
| B‑6601‑4‑4 | Breco | B‑6602‑4‑4 | A04DC‑DP (For Coupler or Plug) | 1/4″ | 1/4″ | Steel |
| 3/8″ Body | ||||||
| B‑6601‑6‑6 | Breco | B‑6602‑6‑6 | — | 3/8″ | 3/8″ | Steel |
| 1/2″ Body | ||||||
| B‑6601‑8‑10 | Breco | B‑6602‑8‑10 | B‑6657‑10 (For Coupler) | 1/2″ | 1/2″ | Steel |
| B‑6608‑8‑10 | Breco | B‑6602‑8‑10 | B‑6657‑10 (For Coupler) | 1/2″ | 1/2″ | Steel |
| 3/4″ Body | ||||||
| B‑6601‑12‑12 | Breco | B‑6602‑12‑10 | A12DC‑DP (For Coupler or Plug) B‑6657‑12 (For Coupler) B‑6659‑12 (For Plug) |
3/4″ | 3/4″ | Steel |
| B‑6608‑12‑12 | Breco | B‑6602‑12‑10 | A12DC‑DP (For Coupler or Plug) B‑6657‑12 (For Coupler) B‑6659‑12 (For Plug) |
3/4″ | 3/4″ | Steel |
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