Brass Grease Fitting Nipples M6 M8 M10 M12 M14 M16 — Straight, 45°, 90° Entry

Match the thread diameter and pitch to your equipment's grease port. Common sizes are M6×1mm for light machinery, M8×1mm or M8×1.25mm for mid-range applications, and M10–M16 for heavier equipment. When in doubt, use a thread gauge or check your equipment's service manual. Mixing up pitch (e.g., ordering M8×1mm when the port is M8×1.25mm) will result in cross-threading.

Choose Straight when the grease gun coupler has direct, unobstructed access to the port. Use 45° when there is a slight clearance issue that prevents a straight coupler from seating. Use 90° when the fitting is in a tight corner, recessed cavity, or behind a frame rail where a straight or 45° fitting cannot be reached. If you are unsure, a 90° fitting generally offers the most flexibility in confined spaces.

Brass is generally more corrosion-resistant than standard carbon steel, making these fittings suitable for moderately humid or outdoor environments such as agricultural equipment and construction machinery. For prolonged saltwater exposure or highly corrosive chemical environments, additional protective measures — such as anti-corrosion grease or stainless steel alternatives — are typically recommended.

Yes. These fittings use a standard ball-check valve design compatible with most hydraulic grease gun couplers — both lever-action and pistol-grip styles. They accept typical NLGI-grade greases (lithium, calcium, and petroleum-based) used in automotive, agricultural, and industrial lubrication applications. Confirm that your grease gun coupler is sized for the fitting head diameter you select.

Brass grease nipples of this type typically handle grease injection pressures in the range of 3,000–6,000 PSI, though the exact rating depends on the specific thread size and installation torque. In most cases, standard hand-operated grease guns operate well within this range. Consult your equipment's service specifications to confirm the required pressure rating before installation.

Pack quantities range from 1 to 100 pieces depending on the size selected. For a single repair, a pack of 1–2 is sufficient. For routine maintenance kits, a pack of 10–20 is generally practical. Larger packs (50–100 pcs) offer better per-unit value for fleet maintenance operations, workshops, or dealers who service multiple machines regularly.

In most cases, applying PTFE thread tape or a thread sealant compound is recommended to prevent grease leakage around the threads, especially in high-pressure or vibration-prone applications. Always torque the fitting to the specification listed in your equipment's service manual — overtightening brass fittings can strip threads or crack the fitting body.