Description
Sutton Tools
Sutton Die Nut — 7/8-9 UNC
Part No: M4452223 | Barcode: 9311963025421 | Brand: Sutton Tools
Sutton hexagonal die nut for restoring damaged or corroded external threads. Hex shape lets you turn it with a standard spanner — ideal for rust-bound bolts, studs and cylinder-head fasteners where a button die and stock would not fit. This 7/8-9 UNC variant covers the UNC (Unified Coarse) thread standard — American Unified Coarse 60° thread — for chasing imperial threads on automotive and US-built equipment fasteners.
Hexagonal Form
Spanner Drive
Thread Restoration
Hardened Steel
Field Maintenance
Hand Use
Key Features & Benefits
- Hexagonal body — turns with any standard open-ended or socket spanner — no die stock required, perfect for in-situ repair.
- Designed for rethreading — restores the existing thread profile rather than cutting fresh material — preserves fastener strength.
- Hardened cutting edges — cleans rust, paint and damaged crests from automotive, agricultural and engineering fasteners.
- Compact form — reaches studs and bolts in confined engine bays, frames and brackets where dies and stocks won’t go.
- Australian made — Sutton Tools, family-owned and manufacturing in Thomastown, Victoria since 1917.
When to Use This Die Nut
Reach for a die nut whenever you need to chase, clean or restore an existing external thread — automotive head studs, exhaust studs, rusted bolts after sand-blasting, painted-over thread crests. Don’t use it to cut a brand-new thread from scratch (that’s a button die’s job) — die nuts re-form the existing crests rather than removing material. This particular variant (M4452223) cuts a 7/8-9 UNC thread.
Pro Tip: A die nut chases threads — it isn’t designed to cut fresh ones. If a fastener looks badly stripped or oversized, replace it rather than relying on a chased thread to hold full torque. For best results wire-brush loose rust off first, then run the die nut on with cutting oil applied generously.
Authorised Sutton Tools Dealer — This product is sourced directly from Sutton Tools Australia, an Australian-owned family business manufacturing cutting tools in Thomastown, Victoria since 1917, and is backed by full Australian manufacturer warranty and local support.
Product Specifications
| Part No. | Size / Pitch | Thread | Form | Barcode |
|---|---|---|---|---|
| M4450635 | 1/4 | UNC | — | 9311963025414 |
| M4450794 | 5/16 | UNC | — | 9311963016597 |
| M4450953 | 3/8-16 | UNC | — | 9311963013770 |
| M4451111 | 7/16 | UNC | — | 9311963014692 |
| M4451270 | 1/2-13 | UNC | — | 9311963013138 |
| M4451588 | 5/8 | UNC | — | 9311963023540 |
| M4451905 | 3/4 | UNC | — | 9311963027296 |
| M4452223 ★ | 7/8-9 | UNC | — | 9311963025421 |
★ You are viewing the highlighted variant. Other sizes in this series are also available.
Browse our full range of taps & dies at Alltools Geelong.
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