Bolts, nuts & washers
AN4 Bolts (1/4-28): Length and Grip by Dash Number
The 1/4-28 AN bolt, with the grip and overall length of every dash number.
- Material4037 or 8740 alloy steel (8740 most common); "C" = 431 stainless
- Thread1/4-28
- Minimum tensile (listed)125,000 psi, as stated by Spruce
Where to buy
AmericaDistributor coming soonOur partner for this region is on its way
EuropeDistributor coming soonOur partner for this region is on its way
OceaniaDistributor coming soonOur partner for this region is on its way
More distributors
AmericaMore distributors coming soon
EuropeMore distributors coming soon
OceaniaMore distributors coming soon
As with AN3, pick by grip, not overall length. Castle nut for a drilled shank: AN310.
Safety: MS24665 cotter pins.
Specifications
| Thread | 1/4-28 |
|---|---|
| Material | 4037 or 8740 alloy steel (8740 most common); "C" = 431 stainless |
| Minimum tensile (listed) | 125,000 psi, as stated by Spruce |
| Plating | Cadmium, QQ-P-416A Type II Class 3 |
| Variants | Drilled or undrilled shank ("A" suffix), drilled head ("H") |
Source: a distributor's listing, checked 2026-09-30.
Length and grip by dash number (as listed) 51 rows
| Dash No. | Nominal Length | Grip Length |
|---|---|---|
| -3 | 15/32 | 1/16 |
| -4 | 17/32 | 1/8 |
| -5 | 21/32 | 3/16 |
| -6 | 25/32 | 5/16 |
| -7 | 29/32 | 7/16 |
| -10 | 1-1/32 | 9/16 |
| -11 | 1-5/32 | 11/16 |
| -12 | 1-9/32 | 13/16 |
| -13 | 1-13/32 | 15/16 |
| -14 | 1-17/32 | 1-1/16 |
| -15 | 1-21/32 | 1-3/16 |
| -16 | 1-25/32 | 1-5/16 |
| -17 | 1-29/32 | 1-7/16 |
| -20 | 2-1/32 | 1-9/16 |
| -21 | 2-5/32 | 1-11/16 |
| -22 | 2-9/32 | 1-13/16 |
| -23 | 2-13/32 | 1-15/16 |
| -24 | 2-17/32 | 2-1/16 |
| -25 | 2-21/32 | 2-3/16 |
| -26 | 2-25/32 | 2-5/16 |
| -27 | 2-29/32 | 2-7/16 |
| -30 | 3-1/32 | 2-9/16 |
| -31 | 3-5/32 | 2-11/16 |
| -32 | 3-9/32 | 2-13/16 |
| -33 | 3-13/32 | 2-15/16 |
| -34 | 3-17/32 | 3-1/16 |
| -35 | 3-21/32 | 3-3/16 |
| -36 | 3-25/32 | 3-5/16 |
| -37 | 3-29/32 | 3-7/16 |
| -40 | 4-1/32 | 3-9/16 |
| -41 | 4-5/32 | 3-11/16 |
| -42 | 4-9/32 | 3-13/16 |
| -43 | 4-13/32 | 3-15/16 |
| -44 | 4-17/32 | 4-1/16 |
| -45 | 4-21/32 | 4-3/16 |
| -46 | 4-25/32 | 4-5/16 |
| -47 | 4-29/32 | 4-7/16 |
| -50 | 5-1/32 | 4-9/16 |
| -51 | 5-5/32 | 4-11/16 |
| -52 | 5-9/32 | 4-13/16 |
| -53 | 5-13/32 | 4-15/16 |
| -54 | 5-17/32 | 5-1/16 |
| -55 | 5-21/32 | 5-3/16 |
| -56 | 5-25/32 | 5-5/16 |
| -57 | 5-29/32 | 5-7/16 |
| -60 | 6-1/32 | 5-9/16 |
| -61 | 6-5/32 | 5-11/16 |
| -62 | 6-9/32 | 5-13/16 |
| -64 | 6-1/2 | 6-1/16 |
| -66 | 6-25/32 | 6-5/16 |
| -72 | 7-9/32 | 6-13/16 |
Questions people actually ask
What is the AN4 Bolts 1/4-28 made of?
4037 or 8740 alloy steel (8740 most common); "C" = 431 stainless, according to the distributor listing checked on 2026-09-30.
Where can I buy the AN4 Bolts 1/4-28?
A distributor we checked lists it in the Americas. The link to its page, with the live price and stock, opens when the partnership does.
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