Mandrel Clamps | McMaster-Carr

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System of Measurement

Actuation Location

Thread Size

Flange OD

Height

Material

Maximum Clamp Expansion

Head Diameter

Export Control Classification Number (ECCN)

EAR99

Number of Mounting Holes

DFARS Specialty Metals

REACH

Shank Diameter

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Maximum Clamping Force

RoHS

Compliant with Exemptions

Length

Thread Length

Drive Size

Overall Length

Head Thickness

Minimum Machined Diameter

0.25"

0.437"

0.75"

Total Indicated Runout (TIR) Accuracy

Thread Pitch

54 Products

Inside Diameter Fixture Clamps


Top Actuation	Side Actuation

Secure a workpiece from the inside diameter, leaving the outside clear for machining. Machine these clamps to match the precise size and contours of your workpiece ID. Mount the clamp to your fixture with the included screws and place your workpiece over it. Turn the socket head cap screw to expand the clamp.

Top Actuation—Top-actuated clamps tighten from the top of the clamp, so workpieces need a through hole.

Side Actuation—Side-actuated clamps tighten from the side of the clamp, gripping parts without a through hole in the top.

						Thread		Drive
	For ID Range	Max. Clamp Expansion	Ht.	Flange OD	Max. Clamping Force, lbf	Size	Lg.	Size	Style	Mounting Fasteners Included	No. of Mounting Holes	Material	Screw Material		Each
Top Actuation



		0.16" to 0.29"	0.005"	27/64"	25/32"	250	2-56	1/2"	5/64"	Hex	Yes	3	Steel	Steel	1341N11	000000


		0.28" to 0.49"	0.01"	55/64"	1 11/64"	950	8-32	1"	9/64"	Hex	Yes	3	Steel	Steel	1341N12	00000
		0.48" to 0.56"	0.013"	63/64"	1 15/64"	1,900	1/4"-20	1 1/4"	3/16"	Hex	Yes	3	Steel	Steel	1341N13	00000
		0.53" to 0.79"	0.015"	63/64"	1 15/32"	2,500	5/16"-18	1 1/4"	1/4"	Hex	Yes	3	Steel	Steel	1341N14	00000
		0.71" to 1.06"	0.015"	1 1/8"	1 31/32"	4,500	3/8"-16	1 1/2"	5/16"	Hex	Yes	3	Steel	Steel	1341N15	00000
		0.9" to 1.39"	0.015"	1 1/4"	2 13/64"	5,900	1/2"-13	1 1/2"	3/8"	Hex	Yes	3	Steel	Steel	1341N16	00000
		1.15" to 1.65"	0.015"	1 9/16"	2 47/64"	10,000	5/8"-11	1 3/4"	1/2"	Hex	Yes	3	Steel	Steel	1341N17	000000
		1.15" to 2.03"	0.015"	1 9/16"	2 31/32"	10,000	5/8"-11	1 3/4"	1/2"	Hex	Yes	3	Steel	Steel	1341N18	000000
		1.15" to 3.06"	0.015"	1 51/64"	4 15/64"	10,000	5/8"-11	2"	1/2"	Hex	Yes	3	Steel	Steel	1341N19	000000
		1.15" to 4.06"	0.015"	1 51/64"	5 15/64"	10,000	5/8"-11	2"	1/2"	Hex	Yes	3	Steel	Steel	1341N22	000000
		1.15" to 6.89"	0.02"	1 51/64"	5 15/64"	10,000	5/8"-11	2"	1/2"	Hex	Yes	4	Steel	Steel	1341N23	000000


		1.15" to 9.85"	0.08"	1 51/64"	6"	6,000	5/8"-11	2"	1/2"	Hex	Yes	4	Aluminum	Steel	1341N24	000000
		4.1 mm to 7.4 mm	0.13 mm	10.7 mm	20 mm	250	M2 × 0.4 mm	12 mm	1.5 mm	Hex	Yes	3	Steel	Steel	1341N311	00000
		7.1 mm to 12.4 mm	0.25 mm	21.8 mm	29.72 mm	950	M4 × 0.7 mm	25 mm	3 mm	Hex	Yes	3	Steel	Steel	1341N312	00000
		12.2 mm to 14.2 mm	0.33 mm	24.9 mm	31.5 mm	1,900	M6 × 1 mm	30 mm	5 mm	Hex	Yes	3	Steel	Steel	1341N313	00000
		13.5 mm to 20 mm	0.38 mm	24.9 mm	37.5 mm	2,500	M8 × 1.25 mm	30 mm	6 mm	Hex	Yes	3	Steel	Steel	1341N314	00000
		18 mm to 27 mm	0.38 mm	28.6 mm	50 mm	4,500	M10 × 1.5 mm	35 mm	8 mm	Hex	Yes	3	Steel	Steel	1341N315	00000
		23 mm to 35.3 mm	0.38 mm	31.8 mm	56 mm	5,900	M12 × 1.75 mm	40 mm	10 mm	Hex	Yes	3	Steel	Steel	1341N316	00000
		29.3 mm to 42 mm	0.38 mm	39.6 mm	69.5 mm	10,000	M16 × 2 mm	45 mm	14 mm	Hex	Yes	3	Steel	Steel	1341N317	000000
		29.3 mm to 51.5 mm	0.38 mm	39.6 mm	75.5 mm	10,000	M16 × 2 mm	45 mm	14 mm	Hex	Yes	3	Steel	Steel	1341N318	000000
		29.3 mm to 77.7 mm	0.38 mm	45.5 mm	107.5 mm	10,000	M16 × 2 mm	50 mm	14 mm	Hex	Yes	3	Steel	Steel	1341N319	000000


		Side Actuation



				0.71" to 1.12"	0.012"	1 5/8"	1 31/32"	4,000	—	—	1/4"	Hex	Yes	6	Steel	Steel	1341N21	000000

Machine-Your-Own Inside-Grip 5C Lathe Collets

The head on these collets acts like a mandrel to support the inside of a hollow workpiece. An expanding screw widens the head to firmly grip the workpiece. It can be machined to fit the exact ID of your part. All have external threads.

	Head Thk.	Min. Machined Dia.	Total Indicated Runout (TIR) Accuracy	Body Dia.	Overall Lg.	External Thread Size	Material		Each
Machine-Your-Own Inside Grip



	1/2"	1"	0.25"	0.0005"	1 1/4"	4 1/2"	1.234"-20	Steel	3242A11	000000


	1"	1"	0.437"	0.0005"	1 1/4"	4 1/2"	1.234"-20	Steel	3242A14	00000
	1"	2"	0.437"	0.0005"	1 1/4"	5 1/2"	1.234"-20	Steel	3242A15	000000
	1 1/2"	1"	0.75"	0.0005"	1 1/4"	4 1/2"	1.234"-20	Steel	3242A17	00000
	1 1/2"	1 1/2"	0.75"	0.0005"	1 1/4"	5"	1.234"-20	Steel	3242A18	000000
	2"	1"	0.75"	0.0005"	1 1/4"	4 1/2"	1.234"-20	Steel	3242A23	000000
	2"	1 1/2"	0.75"	0.0005"	1 1/4"	5"	1.234"-20	Steel	3242A24	000000
	2 1/2"	2 1/2"	0.75"	0.0005"	1 1/4"	6"	1.234"-20	Steel	3242A32	000000

Expanding-End Lathe Mandrels

An expanding screw widens the end of the mandrel for a tight hold on the inside of a workpiece. These mandrels are machinable to fit the exact ID of your part. Mandrels are also known as arbors.

OD	Overall Lg.	Shank Dia.	End Expansion	Material		Each
1/4"	3"	1/4"	0.002"	Steel	2779A11	000000
3/8"	3"	3/8"	0.002"	Steel	2779A12	00000
1/2"	3"	1/2"	0.002"	Steel	2779A13	00000
5/8"	3"	5/8"	0.002"	Steel	2779A14	00000
3/4"	4"	3/4"	0.002"	Steel	2779A21	00000
7/8"	4"	7/8"	0.002"	Steel	2779A22	00000
1"	4"	1"	0.002"	Steel	2779A23	00000
1 1/4"	4"	1"	0.002"	Steel	2779A24	00000
1 1/2"	4"	1"	0.002"	Steel	2779A25	00000
1 3/4"	4"	1"	0.002"	Steel	2779A26	00000

Wide-Diameter Range Lathe Mandrels

The sleeve on these mandrels expands to hold a range of IDs for better versatility than solid and expanding-end mandrels. They can hold the workpiece at any position along the sleeve. To use, insert the sleeve into the workpiece before inserting the small end of the tapered body into the sleeve and pushing until it's tight. Mandrels are also known as arbors.

OD	Overall Lg.	Sleeve Lg.	Total Indicated Runout (TIR) Accuracy	Material		Each
1/2" to 9/16"	5"	2 1/2"	0.001"	Steel	3276A31	000000
9/16" to 21/32"	6"	2 3/4"	0.001"	Steel	3276A32	00000
21/32" to 3/4"	7"	2 3/4"	0.001"	Steel	3276A33	00000
3/4" to 7/8"	7"	3 1/4"	0.001"	Steel	3276A34	00000
7/8" to 1"	7"	3 1/2"	0.001"	Steel	3276A35	00000
1" to 1 1/4"	9"	4"	0.001"	Steel	3276A38	000000
1 1/4" to 1 1/2"	9"	4"	0.001"	Steel	3276A39	000000
1 1/2" to 2"	11 1/2"	5"	0.001"	Steel	3276A42	000000
2" to 2 3/4"	14"	6"	0.001"	Steel	3276A43	000000
2 3/4" to 3 3/4"	17"	7"	0.001"	Steel	3276A44	000000

Inside Diameter Fixture Clamps for Castings and Rough Parts

These clamps wedge against the workpiece ID to grip cast, unfinished, or uneven parts, leaving the outside clear for machining. Do not use these clamps on smooth or finished ID’s because they will leave a mark. The clamp’s screw tightens from the top of the clamp, so workpieces require a through hole. Thread the clamp into a tapped hole in your fixture and place your workpiece over it. Reach through the hole to turn the screw, expanding the clamp.

					Thread		Drive
For ID Range	Max. Clamp Expansion	Overall Ht.	Body Ht.	Max. Clamping Force, lbf	Size	Lg., mm	Size, mm	Style	Mounting Fasteners Included	Material	Screw Material		Each



	0.768" to 0.945"	0.178"	29/64"	23/64"	450	M4 × 0.7 mm	12	3	Hex	Yes	Steel	Steel	3071N11	000000


	0.925" to 1.142"	0.217"	43/64"	33/64"	1,120	M6 × 1 mm	18	5	Hex	Yes	Steel	Steel	3071N12	00000
	1.122" to 1.417"	0.295"	7/8"	43/64"	2,000	M8 × 1.25 mm	25	6	Hex	Yes	Steel	Steel	3071N13	00000

Expanding-End Lathe Mandrel Sets

An expanding screw widens the end of the mandrel for a tight hold on the inside of a workpiece. These mandrels are machinable to fit the exact ID of your part. Mandrels are also known as arbors.

No. of Pieces	Includes	End Expansion	Material		Each
8	Five Hex Keys One 1 1/4" OD × 1" Shank Dia × 4" Lg. Expanding-End Mandrel One 1" OD × 1" Shank Dia × 4" Lg. Expanding-End Mandrel One 1/2" OD × 1/2" Shank Dia × 3" Lg. Expanding-End Mandrel One 1/4" OD × 1/4" Shank Dia × 3" Lg. Expanding-End Mandrel One 3/4" OD × 3/4" Shank Dia × 4" Lg. Expanding-End Mandrel One 3/8" OD × 3/8" Shank Dia × 3" Lg. Expanding-End Mandrel One 5/8" OD × 5/8" Shank Dia × 3" Lg. Expanding-End Mandrel One 7/8" OD × 7/8" Shank Dia × 4" Lg. Expanding-End Mandrel Stand	0.002"	Steel	2779A19	0000000