Best Grease Fitting Tap Kit (2026)

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Specifications are manufacturer rated, as published on each listing and collected 22 October 2026. None of the five state a warranty term.

How we scored them

Each kit is scored on performance (size range, angles and thread coverage), build (materials and case), value for the stated specs, safety and warranty, with the weights published on our How We Pick page. For a fitting kit, safety means a stated certification or similar; none of the five state any, so safety scores zero across the board. None of the five state a warranty term either, so the ranking comes from coverage, extras and case.

Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score. Safety counts only for powered gear or where the listing states safety features; where it does not apply, the score is taken over the remaining 90 points.

What the listings tell you

We read five grease fitting kit listings. All five cover the same core thread sizes (1/4 in, 1/8 in, M6, M8 and M10), and four of the five include straight, 45-degree and 90-degree angles; the LockNLube kit covers straight and 90-degree only. All five use galvanized steel. Piece counts run from 100 to 405, three of the five include wrenches, and three include caps. None of the five state a warranty term.

Buying guide: the best grease fitting tap kit

SAE vs metric threads

Match the thread to the machine, not the kit. The kits here cover 1/4 in, 1/8 in, M6, M8 and M10, with the LockNLube spelling out 1/4-28 SAE-LT, 1/8 in NPT, 6×1 and 8×1 metric, and the UZLU listing 1/4-28, 1/8-27, M6, M8 and M10. Pull one old fitting and match it, or check the manual; a close thread is not the same thread.

Straight, 45 or 90 degrees

The angle exists for access. Straight zerks suit open installations where the coupler comes in square; 45-degree and 90-degree bends serve fittings tucked behind frames, housings or guards where a straight shot is blocked. The UZLU listing makes the point explicitly. If every zerk on your equipment is out in the open, angles matter less; if they hide, buy the kit that stocks all three.

Count the extras, not just the fittings

The headline piece count can mislead. The UZLU 355-piece kit is 200 fittings plus 150 dust caps and 5 wrenches; the PAIGOIN 405-piece kit adds wrenches, caps and sealing tape. The LockNLube kit is the only one with dedicated multi-tools for removing and installing fittings, even broken ones, plus 20 caps to keep new zerks clean. For a working shop, caps and wrenches get used as fast as fittings.

The case matters

A kit that spills in the truck bed is not a kit. The OURU, TAVONUXT and UZLU listings all describe labeled compartments with thick partitions so each size stays separated, the PAIGOIN a reinforced box described as stronger than a regular plastic box, and the LockNLube a bright case meant to be found in a dark truck. A compartmentalized box also tells you at a glance which size is running low before the next job. If the kit lives in a vehicle, pick the sturdier box over the bigger count.

Match the kit to the machines

Buy for the fleet you service. A shop that runs older American iron lives on 1/4 in and 1/8 in threads, while newer equipment and imports add M6, M8 and M10 to the mix; every kit here covers all five. If everything you own is one system, the LockNLube kit’s focused SAE and metric selection with 1/8 in NPT and 1/4-28 threads may be enough. If the yard holds tractors, trucks, excavators and mowers, the 15-size coverage of the UZLU or TAVONUXT kits leaves fewer gaps. Count the machines first, then count the fittings.

Frequently Asked Questions

How do you use a grease fitting?

Wipe the zerk clean, press the grease gun coupler squarely onto it, and pump until fresh grease appears at the joint, then wipe away the excess. No disassembly is needed: the nipple connects the gun straight to the machine’s interior, which is the convenience the OURU and TAVONUXT listings call out. A fitting that will not take grease may be clogged or damaged, which is when a replacement kit earns its keep.

Are grease fittings threaded?

Yes. The kits here use threaded zerks in 1/4 in, 1/8 in, M6, M8 and M10 sizes, with the LockNLube listing 1/4-28, 1/8 NPT, 6×1 and 8×1 threads. Match the old fitting’s thread before installing.

How do you clean tractor grease fittings?

Wipe each zerk before attaching the coupler so grit does not get pushed into the joint. Dust caps keep them clean between services; the UZLU kit includes 150 color-coded caps and the LockNLube kit 20.

How do you remove a grease fitting from a ball joint?

Use the correct wrench on the fitting’s hex and turn it out; the kits here include wrenches in 5 sizes (OURU) or 7 to 11 mm (UZLU), and the LockNLube kit includes two multi-tools made for removing and installing all sizes, even broken ones. Start the replacement by hand to avoid cross-threading, then snug it with the wrench and add a dust cap where the kit provides them.

What size grease fitting do I need?

The size already on the machine. Check the old fitting’s thread (1/4 in, 1/8 in, M6, M8 or M10 in these kits) and its angle, straight, 45 or 90 degrees, and match both. When in doubt, the equipment manual lists the fitting spec.

Related: the mini grease gun vs full size, the best power grease gun, the best grease gun for classic cars, and our engine and shop equipment hub.