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HHIP 1" 7/8-9 T-Slot Nut (3900-1210)
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Purchase options and add-ons
Material | Steel |
Fastener Type | Weld |
Thread Size | 7/8"-9 |
Exterior Finish | Steel |
Color | Black |
About this item
- Heat treated 1040 steel.
- Case hardened.
- Black oxide finish.
- Country of origin: China
Additional Details


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Product details
- Product Dimensions : 10.16 x 3.81 x 3.81 inches; 7.8 ounces
- Item model number : 3900-1210
- Date First Available : July 11, 2013
- Manufacturer : HHIP
- ASIN : B00R160SJ4
- Country of Origin : China
- Best Sellers Rank: #129,603 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
- #23 in T-Slot Nuts
- Customer Reviews:
Product Description
HHIP 1" 7/8-9 T-Slot Nut ~ Heat treated 1040 steel. ~ Black oxide finish. ~ Case hardened.
Important information
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From the manufacturer



About HHIP
Since 1982, our first priority as an importer and superstore has been to provide superior value and service to the manufacturing and metalworking industries.
HHIP T-Slot Nuts & Bolts
HHIP T- slot nuts are high-strength hardened nuts, machined to fit in a specific machine-table T slot & give maximum bearing surface in the table slot. Available in sizes for inch or metric machine-table slots, each with a choice of thread sizes. The T-slot nut is mated with a stud, clamp, & nut to position & secure workpieces. The T-slot nut slides along a T-slot track in a machine tool table or workbench. A T-slot bolt allows quicker set ups and are generally stronger than a T-slot nut & stud.
- The dimension of the T-slot nut is the width at the top of the T-slot.
- Both the nuts & the bolts have a black oxide finish.
- T-Slot nuts are case hardened, heat treated 1040 steel.
- T-Slot bolts have a milled T-slot guide.
- T-Slot bolts are heat treated to HRC 36-40.
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HHIP 3900-1210 1" 7/8-9 T-Slot Nut | HHIP 3436-3441 1/2-13 X 3" Long Alloy Steel Stud | HHIP 3900-1270 1/2-13 X 2" T-Slot Bolt | HHIP 3900-1224 1/2-13 Flanged Nut | HHIP 3900-1187 1/2-13 X 1-1/4" L Coupling Nut | |
Customer Reviews |
4.3 out of 5 stars
121
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3.6 out of 5 stars
8
|
3.9 out of 5 stars
30
|
4.6 out of 5 stars
28
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4.2 out of 5 stars
69
|
Price | $8.72$8.72 | $2.36$2.36 | — | $2.45$2.45 | $3.55$3.55 |
Size | 1" | 3" | 1/2" | 7/8" | 7/8" |
Thread | 7/8-9 | 1/2"-13 | 1/2"-13 | 1/2"-13 | 1/2"-13 |
Finish | Black Oxide | Heat Treated Black Oxide | Forged, Heat Treated, Case Hardened | Heat Treated Black Oxide | Forged, Heat Treated, Case Hardened |
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HHIP 3903-1242 13.7mm M12 X 1.75 T-Slot Nut | HHIP 3436-5014 M12 X 1.75 X 100mm Long Alloy Steel Stud | HHIP 3900-0007 1/8-3/4 By 16ths 11 Piece R8 Collet Set With Free T-Slot Cleaner | HHIP 3900-2103 Angle-Tight Positive-Lock 6" Milling Vise On Swivel Base | |
Customer Reviews |
3.9 out of 5 stars
2
|
4.3 out of 5 stars
11
|
4.5 out of 5 stars
372
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4.3 out of 5 stars
23
|
Price | $2.58$2.58 | $1.49$1.49 | $90.27$90.27 | $347.88$347.88 |
Size | 13.7mm | 100mm | 11 Pieces 1/8-3/4 X 16ths | 6" |
Thread | M12 | M12 | Internally threaded - 7/16"-20 | |
Finish | Heat Treated Black Oxide | Heat Treated Black Oxide | High Grade Tool Steel | Precision Ground |
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Pro-Series 5/8" T-Slot Clamping Kit | Ultra Precision 5/8" T-Slot Clamping Kit | Ultra Precision 5/8" Step Clamp & Block Set | 5/8" T-Slot Downward Force Clamp Kit | 5/8" T-Slot Cam Action Clamp Set | 5/8" Heavy Duty Hold Down Clamp Set | |
Customer Reviews |
4.4 out of 5 stars
283
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3.8 out of 5 stars
17
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4.4 out of 5 stars
8
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4.2 out of 5 stars
7
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4.4 out of 5 stars
6
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5.0 out of 5 stars
2
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Price | $73.35$73.35 | $130.99$130.99 | $21.35$21.35 | $123.03$123.03 | $78.39$78.39 | $68.62$68.62 |
Number of Pieces: | 58 Plus Rack, T-Slot Cleaner & Wrench | 58 | 5 | 4 | 12 | 2 |
Craftsmanship: | Better | Superior | Superior | Superior | Better | Better |
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Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers like the quality of the nuts. They mention that it works well in their machine and is well-finished. Customers also appreciate the quality machining on the threads. However, some customers have mixed opinions on the fit.
AI-generated from the text of customer reviews
Customers like the quality of the nuts. They say it works well in their machine, is well-finished, and has quality machining on the threads and over all piece. They also mention that the critical surfaces were machined, not just cast.
"This is exactly what I needed, works great" Read more
"Great quality. Size and dimensions are as advertised...." Read more
"T-nuts are well made/machined. The only possible issue is that they aren't tapped fully through the body...." Read more
"...The threaded hole isn't drilled with great precision, but it works just fine. The thread isn't complete...." Read more
Customers are mixed about the fit of the nuts. Some mention that it fits perfectly, while others say that it doesn't fit. The height is 9/32", which makes it difficult to fit in slots.
"Great quality. Size and dimensions are as advertised...." Read more
"...Absolutely out of measurement by a lot. You get what you pay for because a good set will cost you money otherwise machine your own" Read more
"Fits in my t-slots, studs threaded in easily and they seem to be machined well enough for general purpose needs...." Read more
"...Obviously, that one doesn’t fit...." Read more
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Note: the T-slot nuts are designed such that the bolt doesn't penetrate past the bottom of the T-slot nut so it doesn't damage the table. For my specific application (cheap drill press) I needed the bolt to go all the way through the nut. This is easily done by running the appropriate size/pitch tap through the T-slot nut to open up those bottom threads.
The threaded hole isn't drilled with great precision, but it works just fine. The thread isn't complete. It is an incomplete thread at the bottom to protect your T-Slot. If you use it for a dril press or other open botom T-slot, then you will want to run a tap through to chase the threads. The most important dimensions (the T-slot) are straight, smooth and accurate.
These are best for metalworking tools. The black oxide finish needs to be oiled and protected. If you have woodworking equipment where your table would typically be dry, you will need a little extra care to prevent corrosion.



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