# 1629831 Hexagon Screw | Genuine Volvo Penta Part

## 🔧 Product Description

Hexagon screw supplied as a standard threaded fastener in the 9/16" UNF x 51 mm size, used as a service replacement item where that thread and length are specified. As a general-purpose fastener it is not tied to a single engine or drive model, and it is the current replacement for several earlier fastener and anchorage part numbers. Net weight is approximately 0.092 kg.

## ⚙️ Key Features

-   OEM Volvo Penta part number 1629831
-   Hexagon head screw, 9/16" UNF thread, 51 mm length
-   Net weight 0.092 kg
-   Supersedes earlier part numbers 1626181, 1698730, 1697966 and 1698731
-   Standard threaded fastener supplied as an individual service item
-   Engine type: Application dependent
-   Also supersedes Volvo part number 1697217

## 🔌 Function

Provides a threaded clamping fastener that secures two or more components together at a specified torque. Its 9/16" UNF thread and 51 mm length determine the joint and grip depth it is intended for.

## ⚠️ Common Signs of Failure

-   Rounded, burred or damaged hexagon head preventing correct socket engagement
-   Stripped, galled or cross-threaded threads that will not hold torque
-   Corrosion, pitting or seizure making removal difficult
-   Stretched or necked shank after over-torquing, causing loss of clamping force
-   Repeated loosening of the joint or components working loose in service

## 🛠️ Service Notes

-   Check the length, thread and strength grade of the replacement against the screw you removed — engine fasteners are chosen for a specific clamp load, and a longer or softer screw is not a substitute
-   Clean the threads in the component and make sure the mating faces are clean and flat before assembly; dirt, paint or old sealant in a joint feels like tightness and leaves the joint loose
-   Tighten to the torque figure and the tightening sequence given in the workshop manual for your engine, working up progressively rather than pulling each screw down in one go
-   Use thread locking or sealing compound only where the manual calls for it, and renew the locking washer, tab washer or nut that works with the screw
-   Renew rather than reuse screws that are corroded, thread-damaged or visibly stretched, and any screw the manual tightens by torque-plus-angle

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   1629831 → Supersedes 1626181

### OEM / Related Numbers

-   1698730 earlier number superseded by this part
-   1697966 earlier number superseded by this part
-   1698731 earlier number superseded by this part
-   1626181 earlier number superseded by this part

## 📦 Condition

-   Genuine Volvo Penta part
-   Brand new
-   Supplied in original or equivalent packaging

## Details

- **Price:** 13.99 AUD
- **Vendor:** Volvo Penta
- **Type:** Fasteners & Fixings
- **Tags:** Volvo Penta Parts | Genuine Marine Engine & Service Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 13.99 AUD | In stock |

## Images

- 1629831 Hexagon Screw | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/1629831-hexagon-screw-genuine-volvo-penta)
> Updated: 2026-10-12