25mm Pins | McMaster-Carr

For components you need to lock in place but also disconnect frequently, these pins have a toggle end and large loop handle. No need for a separate cotter pin, the toggle swivels so you can insert into a hole and then swivels back to secure. Fold down the handle to save space when installed.

Steel

Zinc-Plated Carbon Steel—These pins withstand occasional exposure to moisture. However, since friction from moving parts can wear away the finish, they're not ideal for wet environments. While not nearly as corrosion resistant as stainless steel, they are stronger and won’t deform under stress.

	Head Dia., mm	Handle Finish		Each
Zinc-Plated Carbon Steel







	25 mm Diameter

	100	-0.130 to 0	Rockwell B70	44	Zinc Plated	97141A721	000000

Dowel Pins

Precisely align machine parts and prevent movement during assembly. These dowel pins are machined to tight tolerances and have a uniform diameter for a snug fit. They can also be used as a pivot, shaft, or hinge to join moving components. Since dowel pins can be hard to remove, they are best suited for permanent fixtures that don't require frequent adjustments or disassembly.

Steel

High-Strength Alloy Steel—Our strongest, most wear-resistant pins, these won't bend or break from vibration. Use them for high-stress applications, such as mounting and aligning hydraulic cylinders and injection molds. They perform best in dry environments since moisture will cause them to rust.

	Min. Hardness	Specs. Met	Pkg. Qty.		Pkg.
High-Strength Alloy Steel







	25 mm Diameter

	40	0.008 to 0.021	115,000	Rockwell C58	DIN 6325-m6, ISO 8734	1	91595A931	000000


	50	0.008 to 0.021	115,000	Rockwell C58	DIN 6325-m6, ISO 8734	1	91595A957	00000
	60	0.008 to 0.021	115,000	Rockwell C58	DIN 6325-m6, ISO 8734	1	91595A966	00000
	70	0.008 to 0.021	115,000	Rockwell C58	DIN 6325-m6, ISO 8734	1	91595A977	00000
	80	0.008 to 0.021	115,000	Rockwell C58	DIN 6325-m6, ISO 8734	1	91595A993	00000

Strong-Hold Ring-Grip Quick-Release Pins

A second retaining ball gives these pins more holding power than standard ring-grip pins. They resist loosening from vibration but require a strong tug to pull them out. Good for tight spaces, the split ring folds down out of the way when installed, and you can grab it with one finger to remove. Attach a lanyard to keep pins from getting lost, or add tags to identify components.

Corrosion-Resistant Stainless Steel

High-Strength 17-4 PH Stainless Steel—The strongest stainless steel pins we offer, these are the least likely to deform due to stress and vibration. They resist rust in wet and outdoor environments but won't hold up to the harsh chemicals and acids that 316 stainless steel can.

	Min. Hardness	Handle Material	Ball Material		Each
High-Strength 17-4 PH Stainless Steel







	25 mm Diameter

	25	29.18	153,300	Rockwell C40	Stainless Steel	Stainless Steel	95165A649	000000


	40	29.18	153,300	Rockwell C40	Stainless Steel	Stainless Steel	95165A650	00000
	60	29.18	153,300	Rockwell C40	Stainless Steel	Stainless Steel	95165A651	00000
	80	29.18	153,300	Rockwell C40	Stainless Steel	Stainless Steel	95165A652	00000
	90	29.18	153,300	Rockwell C40	Stainless Steel	Stainless Steel	95165A653	00000
	100	29.18	153,300	Rockwell C40	Stainless Steel	Stainless Steel	95165A654	00000

Ejector Pins

Also known as knockout and forged pins, use these pins to push parts out of molds. Pins are precision-ground to tight tolerances and hardened for strength and wear resistance. Machining is not recommended. Metric pins meet DIN 1530 specifications.

Nitride-Coated H13 Tool Steel

H13 tool steel pins resist rapid changes in temperature.

		Head, mm
Dia., mm	Dia. Tolerance, mm	Dia.	Ht.	Min. Hardness		Each







			250 mm Long

			25.0000	-0.017 to -0.006	32	10	Rockwell C41	93217A105	000000

Press-Fit Locating and Support Buttons

Support and position workpieces and fixtures from the bottom or side. These buttons press into a drilled hole for permanent installation. Also known as rest buttons.

			Stud, mm		Tolerance, mm
	Dia., mm	Lg., mm	Dia.	Lg.	Lg.	Stud Dia.	Specs. Met		Each
Steel



		25	10	12	18	-0.036 to 0	0 to 0.04	DIN 6321	3097N14	000000

Screw-Mount Locating and Support Buttons

Flat Head

Also known as rest buttons, these buttons support workpieces and fixtures from the bottom or side. Mount them onto a screw or stud extending from your jig or table.

Round—Round buttons have an unthreaded, counterbored through hole. Mount them to a socket head cap screw.

	Lg., mm	Lg. Tolerance, mm	For Mounting Screw Size	Mounting Fasteners Included		Each
Steel—Round with Flat Head



	25	12	-0.03 to 0.03	M6	No	3070N15	00000