3M 051131-00973 Hookit 216U Gold 6 Inch P400 Grit Abrasive Disc – Carton of 100

Description

3M Hookit 216U Gold P400 6-inch Abrasive Disc – Carton of 100 for Aerospace Fine Sanding

3M Hookit 216U Gold P400 Grit Abrasive Disc is a hook-and-loop (Hookit) backed coated abrasive disc providing fine P400 grit surface finishing for aerospace painting and refinishing operations. The Hookit hook-and-loop attachment system provides fast disc changes on compatible hook-faced backing pads — press to attach, pull to remove — enabling efficient disc changes during multi-grit finishing sequences without tools or adhesive. The gold color and 216U product designation identify the aluminum oxide mineral and anti-loading treatment that characterize 3M’s Gold series of coated abrasive products.

P400 fine grit is specifically suited for final finish sanding operations in aerospace paint systems — removing P320 or P360 scratch marks, leveling fine surface texture, and preparing the surface for sealer or clear coat application. In aircraft refinishing, the final sanding grit before topcoat application critically determines the surface smoothness under the topcoat and the amount of finish polishing required after painting — P400 provides a sufficiently fine scratch pattern for high-quality aerospace finish results when followed by correctly formulated topcoat.

The carton of 100 discs provides a substantial production supply for aircraft paint shops and MRO finishing operations that perform multi-step fine sanding sequences. The Hookit system’s fast disc change capability minimizes disc change time during intensive finishing operations where P400 discs are consumed at high rate during final surface preparation on large aircraft components and panels.

Technical Information

3M Hookit 216U Gold uses aluminum oxide mineral on a paper backing with a hook-and-loop (hook) interface on the reverse for attachment to Hookit-faced disc pads. The gold anti-loading treatment on the abrasive surface resists clogging during fine sanding — particularly important at P400 grit where the very fine abrasive valleys load more quickly than coarser grades with the material being sanded. Anti-loading treatment significantly extends effective P400 disc life in production finishing operations.

P400 grit provides approximately 35-40 micron scratch depth on the sanded surface — fine enough for the topcoat film to fully bridge and level the scratch pattern in high-quality aerospace finish systems, while still providing sufficient abrasive action to level minor surface irregularities and remove the coarser scratch marks from previous sanding steps. For the finest aerospace finishes, follow P400 machine sanding with P600 hand block sanding to further reduce scratch depth before final topcoat application.

Use Hookit 216U Gold on a 6-inch Hookit-faced backing pad on an orbital or random orbital sander. Apply light, consistent pressure at P400 grit — excessive pressure at fine grits causes rapid disc loading and reduces cut rate. Change discs when loading reduces cutting efficiency rather than increasing pressure to compensate — worn loaded discs at fine grits produce heat and glazing rather than cutting action.

Why Choose?

• ✅ Hookit Hook-and-Loop System — Fast, clean disc changes
• ✅ P400 Fine Grit — Final finish sanding and scratch refinement
• ✅ Gold Anti-Loading Treatment — Extended disc life in fine sanding
• ✅ Carton of 100 — Production supply for aircraft paint shops
• ✅ 3M Gold Quality — Premium coated abrasive for aerospace finishing

Applications

Hookit 216U Gold P400 discs are used for final finish sanding in aircraft refinishing sequences — removing coarser grit scratch marks, leveling fine surface irregularities, and preparing aircraft surfaces for sealer and topcoat application in aerospace paint and refinishing operations.

Frequently Asked Questions

Q: What is 3M Hookit 216U Gold P400?
A: Hookit 216U Gold P400 is a fine grit hook-and-loop disc for final finish sanding — anti-loading treatment extends disc life, and P400 grit provides the fine scratch pattern needed before topcoat application in aerospace refinishing.

Q: MPN for 3M Hookit 216U P400 carton 100?
A: MPN is 7000119685.

Q: What is the Hookit system?
A: Hookit is 3M’s hook-and-loop disc attachment system — the disc has a hook backing that attaches to a loop-faced backing pad. Press to attach, pull to remove. Provides fast disc changes without adhesive.

Q: What grit should come before P400?
A: Typically P320 or P360 is used before P400 in a finish sanding sequence. P400 removes the P320/P360 scratch marks and refines the surface before sealer or topcoat application.

Q: How many discs in a carton?
A: Each carton contains 100 Hookit 216U Gold P400 6-inch Abrasive Discs.