Correct Hardware. Correct Build.
Complete bolt kits for classic Japanese cars. Every fastener for the whole build, sorted and bagged so you spend the weekend wrenching, not hunting for M6s.
JIS nut and bolt kits for the Datsun S30 (240Z, 260Z and 280Z), M6 resto kits for any classic Japanese car, and the Toyota Celica TA22 on the way.
No hardware-shed bolts. Japanese small heads only.
The right hardware. Not whatever was on the shelf.
Japanese small heads
Your car was built with JIS small-head hardware. That means an M10 bolt has a 14 mm head, not the 16 or 17 you get on a hardware-store shelf.
4 mark and 7 mark
Where the factory stamped a 4 or a 7 on the head, you get a 4 or a 7. The numbers tell you what grade you're bolting in.
9 mark bolts are no longer made. Where your car used one, a 10.9 bolt of the same size is substituted, as it's the closest modern equivalent. In nearly all cases it's still a Japanese small head.
Factory finishes
Yellow zinc where the factory used it, and white, black or blue where it didn't. Matched to the position, not to what was in stock.
No 13s. No 16s. No guessing.
Wrong head sizes mean the wrong spanner, a rounded head, and a build that never quite looks right. Every bolt and nut in a Boltright kit uses the JIS small head size, so your factory-size tools fit.
M6 is 10 mm either way. From M8 up, the sizes split.
| Thread | Boltright (JIS small) | Hardware store |
|---|---|---|
| M6 | 10 | 10 |
| M8 | 12 | 13 |
| M10 | 14 | 16 or 17 |
| M12 | 17 | 18 or 19 |
| M14 | 19 | 21 or 22 |
| M16 | 22 | 24 |
When it isn't perfect, we say so.
Sometimes the exact factory part just isn't made any more. When that happens the part is tagged, and the parts lookup tells you exactly what's different: head size, finish, washer or length. No surprises halfway through the build.
Close fitStandard hex head, not the 14 mm JIS small head.
How a Boltright kit works
Pick your chassis
Each kit is built around one model, so you get the right hardware for that car and nothing you don't need.
Unbag by section
Fasteners are grouped by where they live on the car and labelled, so it's easy to tackle the build one area at a time.
Bolt it up
Fit it all with confidence. Correct hardware means a build you won't have to redo.
Big Bolt Kits
Pick your chassis. One kit, every fastener, sorted and bagged. The S30 is first, with more on the way.
Small Bolt Kits
Just rebuilding one part of the car? Get only that section: same bags, same codes, same sorting as the Big Bolt Kit. Restoring the whole car? Get the BBK, it will cost less than buying every section separately.
S30 Big Bolt Kit
Not yet complete: the transmission and its associated fasteners are not included. Interior coverage is limited to the fasteners beneath the dashboard; a small number of additional interior fasteners are supplied as complimentary extras. Certain key suspension bolts without a marked strength grade, mainly in the front suspension, are also not included.
BBL? No, BBK!Big bum? ✔ Even bigger kit? ✔
Nearly every fastener in the S30.
One kit covers the lot, from engine bay to interior to body. Built for restorers and weekend builders who are sick of mystery bolts and mixed-up bags.
Resto kits
Not building a whole car? The M6 Resto Kits are out now: the SEMS screws, 4 and 7 mark bolts, nuts and washers a restoration goes through, in yellow or blue zinc. M8, M10, M5, M4 and self-tapping kits are on the way.
Bolt kits by car: Datsun 240Z bolt kit · Datsun 260Z bolt kit · Datsun 280Z bolt kit
Don't see your car? Request a kit for your chassis.