H3263 Mackay 8903 Dunbier 7/16 x 2 1/4 UNF Grade 8 Bolt Z/P Caliper Bolt | Marine Trailer Part
H3263 Mackay 8903 Dunbier 7/16 x 2 1/4 UNF Grade 8 Bolt Z/P Caliper Bolt | Marine Trailer Part
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🔧 Product Description
Genuine Mackay Marine Trailer Products Grade 8 Caliper Bolt 7/16" × 2-1/4" UNF – Part Number: H3263
A high-strength zinc-plated mounting bolt for compatible mechanical trailer disc calipers.
⚙️ Key Features
- Grade 8 high-tensile construction
- 7/16-inch UNF thread
- Zinc-plated finish
📏 Specifications
- Dunbier cross reference: 8903
- Size: 7/16" × 2-1/4" UNF
🔄 Cross Reference & Related Parts
- Caliper bolt lock: H3250
- Mounting kit: H3261K
🚤 Compatibility & Application
- Compare the removed component and brake-system geometry before installation
- Use high-tensile hardware and specified torque where load-bearing
- After service, confirm free rotation, full brake application and full release
🔌 Function
Secures the caliper to the mounting plate and carries brake reaction loads.
⚠️ Common Signs of Failure
- Component is bent, cracked, seized or heavily corroded
- Mounting holes or threads are damaged
- Brake operation is uneven or unreliable
📦 Condition
- Genuine Mackay Marine Trailer Products part
- Brand new
- Supplied in original or equivalent packaging
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in new, unused condition for a refund or exchange. Manufacturer warranties apply to new parts. Full details in our Refunds & Returns policy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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