Mercury MerCruiser OEM Anchor Pin Inner Washer 12-85058 | R MR Alpha One Gen I Power Trim Cylinder
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Mercury MerCruiser OEM Anchor Pin Inner Washer — Part 12-85058
- Part Number: 12-85058
- Short Number: 85058
- Brand: Mercury Marine / MerCruiser (Genuine OEM)
- Official Product Type: Power Trim Hardware — Anchor Pin Inner Washer
- Material: Stainless steel flat washer
- System: Power Trim — trim cylinder anchor-pin mounting assembly
- Diagram Position: Inner washer at the front and rear anchor-pin locations on the power-trim cylinder assembly
- Dimensions: approx. 1.75 in. L × 1.75 in. W × 0.25 in. H
- GTIN / UPC: 745061154544
- Weight: 14 g (0.014 kg)
What It Does
The 12-85058 is the genuine OEM stainless-steel inner washer used at the power-trim cylinder anchor pin on R, MR, and Alpha One Gen I sterndrives. It installs on the anchor pin as the inner washer in the hardware stack, working with the rubber trim-cylinder bushings, the outer washer (12-44163), and the locknut to locate and retain the trim ram at the anchor point. Mercury trim-cylinder diagrams identify 85058 at both the front and rear anchor-pin assemblies on applicable drives. Two washers are typically specified per anchor-pin assembly — confirm the quantity in the diagram for your specific assembly before ordering.
Important: 12-85058 is the inner washer at the anchor pin. It is not interchangeable with the outer washer 12-44163, which is a different (larger) washer in the same hardware stack. Keep the hardware organized during removal so both washers go back in the correct position.
Compatible Applications
Confirm fitment by drive or transom assembly serial number and the specific Mercury power-trim diagram before ordering. Mercury changed the trim-cylinder anchor hardware across the R/MR/Alpha One Gen I, Alpha One Gen II, and Bravo families — do not substitute based on appearance alone.
- MerCruiser R sterndrive — power-trim cylinder anchor-pin assemblies
- MerCruiser MR sterndrive — power-trim cylinder anchor-pin assemblies
- MerCruiser Alpha One Gen I — front and rear anchor-pin locations (approx. 1983–1990 serial ranges)
Not for Alpha One Gen II or Bravo applications. Alpha One Gen II uses a different trim-cylinder mounting arrangement and a different anchor-pin washer. Verify the drive family by serial number before ordering.
Not sure it fits? Send us your MerCruiser drive or transom assembly serial number before ordering.
Hardware Assembly Context
The 12-85058 inner washer is used alongside the following anchor-pin components. Inspect all of these while the trim cylinder is removed:
- 17-14873A1 — Front anchor pin / front trim-ram bushing kit
- 17-14872A1 — Rear anchor pin / rear trim-ram bushing kit
- 23-99291T — Rubber trim-cylinder bushing
- 12-44163 — Outer anchor-pin washer (different part — not interchangeable with 12-85058)
- 11-859116 — 7/16-20 locknut
- 19-14842 — Anchor-pin cap
None of the above are included with 12-85058 — they are sold separately. If the rubber bushings are oval, cracked, or compressed, replacing the washer alone will not correct looseness at the trim-cylinder mounting point. Inspect and replace the bushings and anchor pin as needed at the same time.
Part Numbers & Cross-References
- 12-85058 — Current Mercury / MerCruiser catalog number
- 85058 — Mercury short-form reference
- GLM 21660 — Aftermarket cross-reference (verify by application)
When to Replace
Replace the anchor-pin inner washer when:
- It is bent, distorted, or no longer sits flat
- The center opening is worn or enlarged from anchor-pin movement
- The washer surface is grooved or damaged from contact with worn bushings
- Heavy corrosion is present on the seating surfaces
- The trim-cylinder anchor hardware is being rebuilt
- The washer is missing from a previously serviced assembly
Service Interval
No fixed replacement interval — inspect whenever the trim cylinder or anchor-pin hardware is removed. Replace on condition if any distortion, corrosion, or wear is found. If the rubber bushings are being replaced, inspect and replace the washer at the same time.
Installation Notes
- Install in the exact inner washer position shown in the Mercury power-trim diagram for your specific drive assembly
- Keep 12-85058 (inner washer) separate from 12-44163 (outer washer) during disassembly — they are not interchangeable
- Inspect the rubber bushings and anchor pin for wear before reassembly; replace bushings if they are oval, cracked, or compressed
- Follow the applicable Mercury service manual for hardware order, fastener torque, and anchor-pin installation procedure
Technical FAQ
Q: What is the difference between 12-85058 and 12-44163?
12-85058 is the inner anchor-pin washer and 12-44163 is the outer anchor-pin washer in the same hardware stack. They are different sizes and are not interchangeable. Both are used at the trim-cylinder anchor-pin location on applicable R/MR/Alpha One Gen I drives.
Q: How many 12-85058 washers does my drive need?
Mercury diagrams typically specify two washers at the applicable front or rear anchor-pin assembly. Check the parts diagram for your specific drive serial number to confirm the exact quantity before ordering.
Q: Does 12-85058 fit Alpha One Gen II or Bravo drives?
No. 12-85058 belongs to the R, MR, and Alpha One Gen I trim-cylinder mounting arrangement. Alpha One Gen II uses a different anchor-pin washer. Always confirm by drive serial number and the applicable trim-cylinder diagram.
Q: Do I need to replace the bushings at the same time?
If the rubber bushings are showing any oval shape, cracking, or compression, replace them while the assembly is apart. A new washer will not correct looseness caused by worn bushings, and the trim cylinder will need to come back apart to fix it.
Parts Desk Insights
The most common issue with 12-85058 is confusion between the inner and outer anchor-pin washers. There are two different washers in the R/MR/Alpha One Gen I anchor-pin stack — 12-85058 is the inner washer and 12-44163 is the larger outer washer. They are not the same part and are not interchangeable, so keeping the hardware in order during trim-cylinder removal makes reassembly straightforward. The other thing to watch: if a customer is replacing just the washer because of looseness at the trim-cylinder mount, the bushings (23-99291T) are usually the root cause. Replacing the washer alone without inspecting the bushings often means the drive comes back apart again. Recommend inspecting the full anchor-pin hardware stack whenever this part is ordered.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
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