Undercut bolt

SKU: Alignment Undercut bolts Category:

Undercut bolt are widely used in industrial applications for aligning motors, pumps, gearboxes, and machine tools.

This undercut bolt and washer system virtually eliminate “bolt binding” are precision manufactured.

These bolts and washers provide extra clearance when moving equipment horizontally across its mounting surface plane.

Bolts are hardened grade 8, and the washers are through-hardened and plated.

Kits come with a wide variety of diameters and lengths. Reduce your downtime and increase your productivity when you achieve and maintain precision alignments faster and smarter with this new innovative design.
In addition to world-class laser alignment tools and shims, the bolts are used for the alignment of all sizes of machines. Sometimes referred to as undercut alignment bolts are designed to allow for additional horizontal movement of the machine base. This can solve the problem of a bolt bound alignment job.
We offer several options for you to purchase undercut bolts, both in sets and as packs of individual sizes. Order only what you need!
All of our bolts are manufactured to SAE J429 Grade 8 specification and come in a black oxide finish.

The undercut bolt sets virtually eliminate the problem of “Bolt Binding.” This innovative precision undercut bolt and washer system helps reduce downtime and increase productivity by helping you achieve and maintain perfect alignment faster and easier than ever before.

The UB200 set features hardened, grade-8 bolts with maximum clearance and through-hardened, plated washers.

• Diameters: 5/16 to 1/2 in. (7.9 to 12.7 mm)
• Lengths: 1 1/4 to 2 in. (32 to 50.8 mm)
• Weight: 12 lbs. (5.5 kg)

The UB300 set features hardened, grade-8 bolts with maximum clearance and through-hardened, plated washers.

• Diameters: 9/16 to 3/4 in. (14 to 19 mm)
• Lengths: 1 ½ to 2 1/2 in. (38 to 63.5 mm)
• Weight: 33 lbs. (15 kg)

Alignment Undercut Bolt Sizes Table

Posi Lock's
Part Number
Size in. (mm)QuantityShank LengthFLUID SEALING SERVICE
Item No.
U92009/16 in. Dia. x 2 in.121-3/8"8140-0563-04
U92509/16 in. Dia. x 2 1/2 in.121-7/8"8140-0563-06
U91509/16 in. Dia. x 1 1/2 in.127/8"8140-0563-02
U10205/8 in. Dia. x 2 in.121-1/4"8140-0625-02
U10225/8 in. Dia. x 2 1/4 in.121-1/2"8140-0625-04
U10255/8 in. Dia. x 2 1/2 in.121-3/4"8140-0625-06
U51255/16 in. Dia. x 1 1/4 in.12
U51505/16 in. Dia. x 1 1/2 in.12
U61253/8 in. Dia. x 1 1/4 in.12
U61503/8 in. Dia. x 1 1/2 in.121"8140-0375-04
U12203/4 in. Dia. x 2 in.121-1/4"8140-0750-02
U12223/4 in. Dia. x 2 1/4 in.121-1/2"8140-0750-04
U12253/4 in. Dia. x 2 1/2 in.121-3/4"8140-0750-06
U82001/2 in. Dia. x 2 in.121-3/8"8140-0500-06
U81751/2 in. Dia. x 1 3/4 in.121-1/8"8140-0500-04
U81501/2 in. Dia. x 1 1/2 in.12
1-1/4" x 4-1/2"123-1/4"8140-1250-06
1-1/4" x 4"122-3/4"8140-1250-04
1-1/4" x 3-1/2"122-1/4"8140-1250-02
1-1/8" x 4-1/2"123-3/8"8140-1125-06
1-1/8" x 4"122-7/8"8140-1125-04
1-1/8" x 3-1/2"122-3/8"8140-1125-02
7/8" x 3"122"8140-0878-06
7/8" x 2-3/4"121-3/4"8140-0878-04
7/8" x 2-1/2"121-1/2"8140-0878-02
1" x 3-1/2"122-1/4"8140-1000-06
1" x 3"121-3/4"8140-1000-04
1" x 2-3/4"121-1/2"8140-1000-02
Hardened Washers
UW99/16 in. Dia.368140-0563-08
UW105/8 in. Dia.368140-0625-08
UW123/4 in. Dia.368140-0750-08
UW55/16 in. Dia.24
UW63/8 in. Dia.248140-0375-06
UW81/2 in. Dia.368140-0500-08
7/8" Washer8140-0878-08
1" Washer8140-1000-08
1-1/4" Washer8140-1250-08
1-1/8" Washer8140-1125-08